close

Вход

Забыли?

вход по аккаунту

?

JP2004297368

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2004297368
An array speaker inspection device, an array speaker device, and an array speaker inspection
method capable of easily determining the connection state of each speaker constituting an array
speaker and the polarity of the speaker. A test signal of a predetermined frequency is generated
by a DSP 11, output from a plurality of speakers SP1 to SP4 of the array speaker apparatus 1,
and voices of the test signals output from the plurality of speakers are collected by a microphone
6. Then, the voice is converted to a frequency domain component by the CPU 15. Then, the CPU
15 determines the speaker connection state based on the value of the frequency domain
component. Further, based on the phase of the test voice detected by the microphone 6, the CPU
15 determines the polarity of the speaker. The determination result is notified to the examiner by
voice from the speaker determined to be non-defective. [Selected figure] Figure 3
Array speaker inspection device, array speaker device, and wiring determination method of this
device
The present invention relates to an array speaker inspection device, an array speaker device
incorporating the inspection device, and a wiring inspection method of the array speaker device.
2. Description of the Related Art In recent years, multi-channel surround systems are becoming
popular in general homes. By using the surround system when viewing content such as a movie
or a concert, the user can enjoy a realistic and powerful surround sound in a living room or the
like of a home. However, in order to use this surround system, the user needs to install a plurality
of speakers in advance around the viewing position of the content. For example, when using a
5.1ch surround system, the user needs to install a total of six speakers around the user's viewing
position at a certain interval. Therefore, the user had to wire or attach it to a wall for each of a
total of six speakers. Therefore, a speaker apparatus (an apparatus and method for directing
sound) capable of reproducing surround sound from one panel-like array speaker in which a
04-05-2019
1
plurality of nondirectional speakers are arranged at predetermined intervals has been proposed
(for example, Patent Document 1). The speaker device described in Patent Document 1 controls
the directivity of a plurality of beams by reflecting and controlling the directivity of a plurality of
beams by delay-controlling an audio signal supplied to each speaker constituting an array
speaker, A plurality of virtual sound sources are created around the user's viewing position to
reproduce surround sound. Further, Patent Document 1 describes a method of inspecting signal
wiring of a speaker device. Patent document 1 WO 01/23104 pamphlet (page 1-63, FIG. 1-32).
However, according to the method of inspecting signal wiring of a speaker device described in
Patent Document 1, a test signal that can be identified for each speaker is generated, and a user
listens to music. In order to control so that the test signal is not heard by the user even during
operation, extremely complicated control is required. Further, since the determination processing
is integrated, there is no procedure of determination in stages, and a means for preventing a
determination error is not prepared. Furthermore, this method can check the connection but not
the polarity, so if the speaker's polarity is wrong, the speaker device can produce a focused
(focused) beam In addition, there was a problem that it was not possible to reproduce effective
surround sound.
Therefore, an object of the present invention is to provide an array speaker inspection apparatus,
an array speaker apparatus, and an inspection method of an array speaker capable of easily
determining the connection state of each speaker constituting the array speaker and the polarity
of the speaker. Do. The present invention is provided with the following configuration as means
for solving the above-mentioned problems. (1) An inspection apparatus for an array speaker in
which a plurality of speakers are arranged in an array, which is a signal generation unit that
generates a test voice signal of a predetermined frequency and supplies the signal to the plurality
of speakers; A sound collection unit for detecting test sound output from the speaker; a
conversion unit for converting the test sound detected by the sound collection unit into a
frequency domain component; and connecting the plurality of speakers based on the value of the
frequency domain component And determining means for determining a state. In this
configuration, since the connection state of the speaker is inspected based on the value obtained
by converting the sound output from each speaker of the array speaker into the frequency
domain component, the configuration can be easily configured and the control is simple.
Procedures can be clearly separated and accurate connection status checks can be performed. (2)
The signal generation means simultaneously generates test voice signals of different frequencies
for the plurality of speakers, and the determination means outputs the test output from each of
the plurality of speakers. The connection state of each of the plurality of speakers is determined
based on the value of the frequency domain component corresponding to the frequency of voice.
In this configuration, test voice signals of different frequencies are simultaneously generated for
a plurality of speakers, and the test voice is output from each speaker. It can be determined by
(3) When the value of the frequency domain component corresponding to the frequency of the
test sound output from each of the plurality of speakers exceeds a predetermined threshold, the
04-05-2019
2
determination means determines that the connection state of the speakers is good. It is
characterized by judging. In this configuration, the test sound of the speaker collected by the
sound collection unit is converted into the value of the frequency domain component, and the
determination is performed by comparing with a predetermined threshold value, so that the
connection state of the speaker can be easily determined. . (4) When the value of the frequency
domain component corresponding to the frequency of the test signal output from the plurality of
speakers is less than or equal to a predetermined threshold value, the determination means again
determines the test signal of the predetermined frequency The connection state of each of the
speakers is determined based on the value of the frequency domain component corresponding to
the frequency of the test signal output from each of the plurality of speakers. I assume.
When sound of different frequency is outputted from each speaker of the array speaker, a nondefective product is erroneously judged as a defective product due to unexpected environmental
noise or spatial interference with a test sound outputted from another speaker. There are times
when Therefore, the erroneous determination of the non-defective product can be prevented by
checking whether there is an erroneous determination one by one or not for the ones determined
to be defective in the speaker connection inspection. (5) A voice notification means is provided
for outputting the determination result of the determination means from the plurality of
speakers. In this configuration, since the determination result of the connection state of the
plurality of speakers can be notified by voice, the examiner can easily grasp the determination
result. (6) The apparatus is characterized by comprising polarity determination means for
determining the polarity of the speaker based on the phase of the test sound detected by the
sound collection means. In this configuration, for example, a sine wave test sound whose phase
changes from positive to negative is output from each of the speakers constituting the array
speaker, and the test sound is collected by the sound collection unit to obtain the phase. Check. If
the polarity of the speaker is correct, the collected voice will be a waveform of the same phase as
the test voice output from the speaker, but if the polarity of the speaker is incorrect, it will be a
waveform of the opposite phase to the test voice output from the speaker The polarity of the
speaker can be easily determined. (7) The voice notification means is characterized in that the
determination result of the polarity determination means is output from the speaker. In this
configuration, since the result of the determination of the state of polarity of the plurality of
speakers can be notified by voice, the examiner can easily grasp the determination result. (8) An
array speaker in which a plurality of speakers are arranged in an array, and the array speaker
inspection device according to any one of (1) to (7). In this configuration, the array speaker
device is provided with a device for inspecting the wiring and polarity of the array speaker, so
that not only the inspection at the time of completion of manufacture but also when a problem
occurs during use by the user Since the inspection can be performed without bringing the
inspection device to the user, defects can be immediately found and repaired. Also, in some cases,
after the user inspects the array speaker, the inspection result can be notified to the
manufacturer to request repair.
04-05-2019
3
(9) A wiring determination method for an array speaker apparatus in which a plurality of
speakers are arranged in an array, which comprises: generating a test signal of a predetermined
frequency and supplying the test signal to the plurality of speakers of the array speaker
apparatus; The method comprises the steps of: detecting a voice of a test signal output from the
plurality of speakers; converting the voice into a frequency domain component; and determining
a speaker connection state based on the value of the frequency domain component. It is
characterized by In this configuration, the same effect as that of (1) can be obtained.
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an external view of an array speaker
apparatus provided with an array speaker inspection apparatus according to an embodiment of
the present invention. The array speaker device 1 has a configuration in which a plurality of
speakers 2 are arranged in an array at predetermined intervals. Moreover, the array speaker
apparatus 1 internally includes a plurality of speakers 2 and a plurality of amplifiers individually
corresponding to the respective speakers, and can control the individual speakers 2
independently. The array speaker device 1 has a microphone input terminal 3 for connecting a
microphone 6 on the side surface or the back surface, and a signal input terminal 4 for
connecting an output of a reproduction device (not shown) for reproducing content such as a
DVD player. And an operation unit 5 for operating the array speaker device 1. Further, the array
speaker device 1 incorporates an inspection device 30 for determining the connection state and
the polarity of the speaker 2. The inspection apparatus 30 is not built in the array speaker
apparatus 1 but provided outside the array speaker apparatus 1 and connected to the array
speaker apparatus 1 at the time of inspection to perform inspection. Of course good. In the
manufacturing process, when the assembly of the array speaker device 1 is completed, a wiring
connection check is performed. The examiner connects the terminal of the microphone 6 to the
microphone input terminal 4, and places the microphone 6 at a substantially central position (for
example, a position 2 m from the array speaker device 1) in front of the front side of the array
speaker device 1. Then, the examiner operates the operation unit 5 to output the sound of the
test signal generated inside the array speaker device 1 from each speaker 2 and collects the
sound by the microphone 6. The inspection apparatus 30 analyzes the audio signal collected by
the microphone 6 with the processor to determine the quality of the connection state of the
individual speakers 2. FIG. 2 is a block diagram of the array speaker apparatus. Here, although
only a total of four speaker units are illustrated in FIG. 2, this is for the purpose of simplifying the
description, and it is actually configured to have several hundred speaker units, for example, 256
It is preferable to be configured to have a speaker unit of = 16 * 16).
In the following description, specific operations and the like will be described for four speaker
units. The array speaker device 1 includes an operation unit 5, a DSP 11, an ADC 12, a DAC block
13, an ADC 14, a CPU 15, a ROM 16, a RAM 17, an OSC block 18, a changeover switch 19,
inverters In2, In4,. And the digital signal input terminal 22, the analog signal input terminal 23,
04-05-2019
4
the microphone input terminal 24, the amplifiers Amp1 to Ampn, and the speakers SP1 to SPn.
The wiring inspection device 30 of the array speaker device 1 includes an operation unit 5, an
ADC 14, a CPU 15, a ROM 16, a RAM 17, an OSC block 18, a changeover switch 19, and a
microphone input terminal 24. The operation unit 5, the DSP 11, the DAC block 13, the ADC 14,
the CPU 15, the ROM 16, the RAM 17, and the OSC (oscillator) block 18 are connected via a bus
line 25. The array speaker device 1 is provided with n sets of speaker units SU1 to SUn, and in
FIG. 2, the speaker unit SU1 including an amplifier Amp1 and a speaker SP1, an amplifier Amp2,
an inverter In2, and a speaker SP2 in FIG. Only a total of four speaker units of the speaker unit
SU2, the speaker unit SU3 including the amplifier Amp3 and the speaker SP3, and the speaker
unit SU4 including the amplifier Amp4, the inverter In4, and the speaker SP4 are illustrated.
Further, as an example, each speaker unit of the array speaker device 1 shown in FIG. 2 is
configured such that adjacent speaker units are supplied with drive signals of opposite phases to
each other, and the final acoustic output is The adjacent speaker units are connected so that their
polarities are opposite to each other so that they have the same phase. That is, in the speaker
units SU1 and SU3, the positive terminal of the speaker SP1 is connected to the output of the
amplifier Amp1, the positive terminal of the speaker SP3 is connected to the output terminal of
the amplifier Amp3, and the negative terminals of the speaker SP1 and the speaker SP3 are
common. Connected to ground and connected to ground. In the speaker units SU2 and SU4, the
negative terminal of the speaker SP2 is connected to the output of the amplifier Amp2, the
negative terminal of the speaker SP4 is connected to the output terminal of the amplifier Amp4,
and the positive terminals of the speaker SP2 and the speaker SP4 are common. Connected to
ground and connected to ground.
In the speaker unit SU1, when the signal output from the DAC unit 13 is a positive signal, this
signal is amplified by the amplifier Amp1 and is input to the positive side terminal of the speaker
SP1, and is input via the negative side terminal of the speaker SP1. By flowing to the ground, the
speaker SP1 is driven. Further, in the speaker unit SU2, when the signal output from the DAC
unit 13 is a positive signal, this signal is converted into the opposite phase by the inverter In2
and supplied to the amplifier Amp2, so from the ground to the positive side terminal of the
speaker SP2. A signal flows in the direction of the amplifier Amp2 through the negative terminal
of the speaker SP2. At this time, the correlation between the input signal from the DAC block 13
to the speaker unit SU1 and the input signal to the speaker unit SU2 is high (in the main driving
method of the array speaker, substantially the same signal is input to each speaker unit
Therefore, most of the current flows from the speaker unit SU1 to the speaker unit SU2, and the
current flowing to the ground is only the current corresponding to the difference between the
input signal to the speaker unit SU1 and the input signal to the speaker unit SU2. This
phenomenon is similar between the speaker unit SU3 and the speaker unit SU4. Therefore, by
configuring each speaker unit of the array speaker device 1 in this manner, the ground potential
generated due to the wiring impedance also decreases, and good characteristics can be expected.
Further, in the array speaker device 1, the drive signal can be supplied to each speaker unit in a
04-05-2019
5
single counter battle, and the ground line can be made common to all the speaker units, so the
number of wires can be reduced. be able to. The inspection apparatus 30 of the array speaker
apparatus can of course be inspected not only with the array speaker apparatus 1 including the
speaker units SU1 to SU4 having the configuration shown in FIG. 2 but also with a conventional
array speaker. When an audio signal output from an external reproduction device connected to
the array speaker device 1 is a digital signal, this audio signal is input from the digital input
terminal 22 to the DSP 11 as it is. When the audio signal output from the external reproduction
device is an analog signal, the audio signal is digitized by the ADC 12 and input to the DSP 11.
When the audio signal is encoded by Dolby Digital, Dolby Pro Logic II, or the like, the DSP 11
decodes this audio signal.
Also, the DSP 11 performs sound field processing if any sound field processing is required.
Furthermore, although not described in detail here, the DSP 11 performs delay processing for
each speaker when performing directivity control aiming at an acoustic lens effect by delaying
the signal of each speaker. The digital signal processed by the DSP 11 is analogized by the DAC
block 13 and inverted by the inverters In2, In4,..., Inn via the switching relay 19, or directly
amplified by the amplifiers Amp1 to Ampn. Then, it is output from the speakers SP1 to SPn. With
the above configuration, the array speaker device 1 can output an audio signal output from an
external reproduction device from the speaker. Subsequently, a configuration for checking the
connection of each speaker of the array speaker device 1 will be described based on FIG. When
the CPU 15 detects that the user has made an input from the operation unit 5, the CPU 15 reads
a wiring state check program from the ROM 17 and performs the following processing. That is,
the CPU 15 switches the switching relay 19 to the OSC block 18 side, and specifies that a test
signal (sine wave signal) of a predetermined frequency is to be output from the OSC block 18.
The OSC block 18 outputs sine wave signals to the individual amplifiers Amp1 to Amp4 and
outputs sound from the speakers SP1 to SP4. The sine wave signal output from the OSC block 18
to the amplifiers Amp2 and Amp4 is inverted by the inverters In2 and In4 as described above. It
is also possible to generate this sine wave signal by the DSP 11, and in this case, the OSC block
18 becomes unnecessary. Signals output from the speakers SP 1 to SP 4 are collected by the
microphone 6, input to the array speaker device 1 from the microphone input terminal 24, and
digitized by the ADC 14. Then, the CPU 15 stores the digitized audio signal in a buffer area
configured in the RAM 16. Further, the CPU 15 acquires sampling data for a predetermined
period from the buffer area of the RAM 16 and converts the sampling data into frequency
components by DFT (Discrete Fourier Transform) processing. Note that this processing can also
be performed by the DSP 11. The CPU 15 determines whether or not the connection state is
broken, that is, whether or not the frequency component of the oscillation frequency is equal to
or higher than a predetermined threshold value. In addition, the CPU 15 performs a secondary
check on the speaker whose frequency component of the oscillation frequency is equal to or less
than a predetermined threshold.
04-05-2019
6
Furthermore, the CPU 15 inspects the polarity of the speaker after determining the connection
state of the speaker, and the details of the inspection method will be described later. As described
above, the connection quality of each of the speakers constituting the array speaker device 1 is
determined, and the examiner is notified of the detection result by voice as needed. The CPU 16
uses the fixed message stored in the ROM 17 and the phoneme data of the message of the word
forming the numeral to notify the detection result from the speaker determined to be normal in
the examination. For example, “The disconnection is 4, 15; the polarity difference is 8, 17
Output the voice of the contents such as. Next, a specific wiring inspection method in each
speaker unit of the array speaker device 1 will be described. FIG. 3 is a schematic diagram of
frequency conversion of sine waves different in frequency output from four speakers by DFT to
determine connection failure. In the present invention, test voices (voices of sine wave signals)
having different frequencies are simultaneously output from the speakers SP1 to SP4 of the array
speaker device 1, and the voices are collected by the microphone 6. Then, DFT processing is
performed by the inspection device 30 incorporated in the array speaker device 1 to convert the
voice into components in the frequency domain, and the value of the frequency spectrum at the
frequency of each test voice is compared with a predetermined threshold value set in advance.
And determine the disconnection of the speaker. When the speaker does not output sound due to
disconnection or the like, since the value of the frequency spectrum is equal to or less than a
predetermined threshold, it is determined that the wiring state of the speaker is defective. Next,
how to determine the frequency of the test signal in each speaker and the setting of the DFT will
be described. In DFT, discrete signals sampled at a sampling frequency of 32 kHz, for example,
are frequency-transformed with 1024 as one unit (time width is 32 ms). Here, the description of
the resolution of quantization is omitted. In this case, the aliasing frequency (Nyquist frequency)
is 16 kHz, and the resolution of frequency components is 31.25 Hz. In the array speaker device
1, the CPU 15 appropriately sets the frequency of the test signal in this frequency resolution unit.
That is, assuming that the spectrum component after frequency conversion is C (k) and the
frequency at that time is F (k), F (1) starts from 31.25 Hz on the real frequency side, and F (k) is
31.25. It becomes x k (Hz). For example, as shown in FIG. 3C, f1 is F (10) 312.5 Hz, f2 is F (20)
625 Hz, f3 is F (30) 937.5 Hz, f4 is F It is 1250 Hz which is (40).
In addition, in order to prevent the occurrence of beats and the like, it is better not to set the
frequencies at equal intervals in practice. Here, the reason why these frequencies are made to
correspond to the respective speakers and the intervals between the respective frequencies are
expanded is to take into consideration the influence on adjacent frequency components and the
separability. It goes without saying that the value of the frequency may be set appropriately
according to the design circumstances of the above. If it is difficult to assign an appropriate
frequency due to the large number of speakers, increase the sampling frequency to, for example,
44.1 kHz or 48 kHz, or expand the DFT processing data number to 2048 points or 4096 points.
For example, the selection range can be expanded. Note that since discrete data is processed as
04-05-2019
7
repetition of data in the processing frame, an unexpected spectrum appears when the connected
part is discontinuous, but this may be handled by a well-known window function process or the
like. Next, the threshold value for judging the quality of the above-mentioned spectral component
will be described. FIG. 4 is a diagram showing a method of setting the threshold. The spectrum C
(k) is expressed by the following equation. Where h (i) is a time domain signal value, and N is the
number of samples. <Img class = “EMIRef” id = “198384690-00003” /> The spectral
component is | C (k) |, which is calculated by the square root of the sum of squares of real and
imaginary components. Although this spectral component is a calculation theoretical value, an
approximate value can be obtained by taking into consideration the amount of attenuation due to
the influence of space propagation by actual experiments. Thereby, as shown in FIG. 4, it is
preferable to set an appropriate threshold between the spectrum generated from environmental
noise and the spectral component value of the signal from the relationship between the digital
value of the input signal and the digital value of the spectral component. Next, the process of
determining the wiring in each speaker of the array speaker device 1 will be described based on
a flowchart. FIG. 5 is a flowchart for explaining the determination processing procedure of the
wiring in each speaker of the array speaker device. FIG. 6 is a determination result table. The
CPU 15 of the inspection apparatus 30 incorporated in the array speaker apparatus 1 sets the
OSC block 18 so as to output sine waves of different frequencies according to the frequency table
for each speaker stored in the RAM 16 (s1 ).
At this time, the CPU 15 switches the switching relay 19 provided in the former stage of the
amplifier to the OSC block 18 side in conjunction with the output of the OSC block 18 (s2). The
CPU 15 takes in audio data sampled from the microphone 9 for 1024 points and performs DFT
processing (s3). Then, the result is stored in the RAM 16 (s4). Further, the CPU 15 stops the
output of the OSC block 18 (s5). Subsequently, the CPU 15 compares spectral component values
at corresponding points of data obtained as a result of sequential DFT processing according to
the frequency tables of the speakers SP1 to SP4 with a preset threshold Th (s6). As shown in FIG.
6, the CPU 15 sets 1 to the entry of disconnection in the determination result table provided in
the RAM 16 for the speaker whose spectral component value is equal to or less than the
threshold Th (s7). Further, as shown in FIG. 5, the CPU 15 sets 0 for the disconnection entry of
the determination result table for the speaker whose spectral component value exceeds the
threshold value Th (s8). Then, the CPU 15 ends the process. According to the above-described
procedure, a speaker whose connection state is bad is detected. Next, the rechecking process of
the speaker determined to be defective in the above wiring determination will be described. The
inspection device 30 of the array speaker device 1 can substantially determine the connection
failure of the speaker by performing the above determination. However, in this inspection
method, the spectral component is affected by unexpected environmental noise, spatial
interference with the test sound output from other speakers, etc. and falls below the threshold,
and the good product is judged as a defective product. There is. Therefore, in the present
invention, a secondary check is performed to determine whether there is any misjudgment or not
04-05-2019
8
with respect to those determined as defective in the speaker connection inspection to prevent the
misjudgment of non-defective products. The implementation procedure of the secondary check
method for the connection of the speakers is as follows. FIG. 7 is a flowchart for explaining the
secondary check method of the speaker. In the secondary check, the CPU 15 of the inspection
apparatus 30 does not inspect a plurality of speakers at the same time as the primary check for
the speakers determined to be defective, but one for each speaker The following process is
performed one by one. First, the CPU 15 confirms the speaker in which 1 is set in the item of
disconnection in the determination result table, and acquires the number of the speaker
determined to be defective (s11).
Subsequently, the CPU 15 causes the OSC block 18 to output a sine wave signal of a
predetermined frequency to the speaker determined to be defective (s12). Here, the frequency of
the sine wave signal to be output from the OSC block 18 may be the frequency of the sound
output from the speaker during the primary check, or may be another frequency. The CPU 15
collects the sound output from the speaker determined to be defective by the microphone 6,
takes in the sound data, and performs DFT processing (s 13). Then, the spectrum component at
that frequency is stored in the RAM 16 (s14). The CPU 15 repeats the processes of steps s12 to
s14 several times (for example, three times), and stores all the spectral components acquired
each time in the RAM 16 (s15). Subsequently, the CPU 15 stops the output of the OSC block 18
(s16). Further, the CPU 15 reads all the values of the spectral components stored in the RAM 16
and calculates an average value (s17). Then, the average value is compared with the threshold
value Th (s18). If the average value is equal to or greater than the threshold Th, the CPU 15
changes the value of the determination result table to 0 (s19). If the average value is less than
the threshold value Th, the CPU 15 determines that the connection is defective (disconnection)
and sets the value of the determination result table to 1 without changing it (s20). Then, the CPU
15 ends the process. As described above, the test is performed a plurality of times in which a
single test sound is output for each speaker, and DFT is performed on each test result, and the
average value is compared with the threshold value to make a determination. It is possible to
prevent the non-defective speaker that is erroneously determined in the next check from being
treated as a defective product as it is. Next, a procedure in which the inspection device of the
array speaker device notifies the inspector of the result of the speaker connection determination
will be described. FIG. 8 is a flowchart for explaining a procedure in which the inspection
apparatus notifies the inspector of the result of the speaker connection determination. FIG. 9 is a
diagram showing an example of phoneme data. The inspection device 30 of the array speaker
device 1 can notify the examiner of the result of the determination of the connection of the
speakers by voice. At this time, the inspection device 30 notifies the examiner of the inspection
result from the speaker determined as the non-defective item of the array speaker device 1. The
procedure in which the inspection device 30 notifies the inspection result is as follows. As shown
in FIG. 8, the CPU 15 of the inspection apparatus 30 checks the presence / absence of a speaker
determined to be defective as disconnection in the determination result table (s21).
04-05-2019
9
If there is a speaker of defect determination in which 1 is set in the item of disconnection, the
CPU 15 acquires the number of the speaker (s22). In the determination result table shown in FIG.
6, the third speaker is disconnected. The CPU 15 reads out data for conveying the inspection
result from the phoneme data stored in the ROM 17 based on the acquired speaker number, and
combines the data (s23). For example, as shown in FIG. 9, the data of the phoneme data a “open
circuit” and the data “3” of the phoneme data c are read out and these phoneme data are
combined. The CPU 15 outputs the phoneme data to the DAC block 13. The DAC block 13
outputs an audio that conveys the inspection result “break is 3” via the amplifier and the
speaker determined to be non-defective (s24), and ends the processing. When the speaker
number determined to be defective is two digits or three digits, the CPU 15 further reads out the
data of “ten” or “100” of the phoneme data d and combines these phoneme data. For
example, if the speaker number determined to be defective is 234, the CPU 15 determines that
the data of the phoneme data a “broken wire”, the data of “2” “3” “4” of the phoneme
data c, and the “phonetic data d” The data of “10” and “100” are read out and these
phoneme data are combined. Then, it outputs a voice that conveys the inspection result of
“break is 234 (2304)”. On the other hand, as a result of checking the determination result
table in step s 21, when there is no speaker whose “1” is set in the item of disconnection, the
CPU 15 uses the phoneme data stored in the ROM 17 as shown in FIG. The data a “broken
wire” and the data “phoneme data e“ does not exist ”are read out and these phoneme data
are combined (s 25). Then, the CPU 15 outputs the phoneme data to the DAC block 13. The DAC
block 13 outputs a voice “there is no disconnection” via the amplifier and the speaker
determined to be non-defective (s26), and ends the processing. The inspection apparatus 30 can
easily notify the inspector of the array speaker apparatus 1 of the inspection result of the wiring
failure by executing the above processing. Next, a method of determining the polarity of the
array speaker device 1 will be described. In the array speaker device 1, since the speakers are
alternately switched in the adjacent speaker units as described above, the speakers may be
attached erroneously at the time of manufacture.
In addition, even in the case of an array speaker having a configuration in which the polarities
are not alternately switched, there is a possibility that the speaker may be attached incorrectly in
manufacturing. Therefore, the examiner not only needs to determine the connection state of the
speakers of the array speaker apparatus 1, but also needs to check the polarity of the speakers.
In the present invention, after confirming the connection state of the array speaker device 1, the
polarity inspection of each speaker is performed. FIG. 10 is a flowchart for explaining the
procedure in which the inspection apparatus carries out a polarity inspection on each speaker of
the array speaker apparatus. FIG. 11 is a diagram showing the positional relationship between
the speaker that has output the impulse signal and the microphone. The procedure of the
polarity test of each speaker is as follows. As shown in FIG. 10, the CPU 15 of the inspection
04-05-2019
10
apparatus 30 confirms the item of disconnection in the determination result table, and acquires
the speaker number of the non-defective product whose disconnection inspection is set to 0 in
the entry (s31) . Subsequently, the CPU 15 causes the DSP 11 to generate an impulse signal, and
causes the DAC block 13 to output the voice of the impulse signal from the corresponding
speaker via one of the amplifiers Amp1 to Amp4 (s32). The voice of the impulse signal collected
by the microphone 6 is converted into a digital signal by the ADC 14 and output to the DSP 11.
At this time, the CPU 15 causes the DSP 11 to measure the time from the output of the impulse
signal to the detection of the audio signal of the impulse signal collected by the microphone
(s33). This time is almost equal to the time from the output of the impulse signal from the
speaker to the arrival at the microphone 6, and is the arrival time T as shown in FIG. 7A. For
example, assuming that the distance between the speaker provided in the array speaker device 1
and the microphone 6 is approximately 2 m, the arrival time T is approximately 60 ms. In the
array speaker device 1, even if the polarity of the speaker is reversely connected, the voice is
output by the reaction of the speaker, and the deviation time of the output timing of the voice is
negligible. The CPU 15 causes the DSP 11 to generate a sine wave signal that changes from a
positive value to a negative value as shown in FIG. 11B, and via the DAC block 13 and either of
the amplifiers Amp1 to Amp4. The sound of this sine wave signal is output from the
corresponding speaker (s34). Here, it is preferable that the frequency of the sine wave output
from the DSP 11 be as low as possible within the outputable frequency range in consideration of
the margin of the accuracy of the waveform width.
For example, when the frequency is 300 Hz, one waveform width time (one cycle) is about 3 ms.
The CPU 15 causes the DSP 11 to acquire the sine wave signal collected by the microphone 6
through the ADC 14 (s 35). Subsequently, as shown in FIG. 11C, after the CPU 15 outputs the
sine wave signal to the DSP 11, the arrival time T + 1⁄4 wavelength time (about 0.8 [ms]) of this
sine wave signal has elapsed It is checked whether the data acquired later is a negative value
(s36). As described above, a sine wave signal that changes from a positive value to a negative
value is output from the speaker, but if the speaker polarity is incorrect, the speaker changes
from a negative value to a positive value. Output a signal. The method of determining the polarity
is not limited to the method described above, and it is a method of monitoring whether or not the
signal first detected after the arrival time T has elapsed is a negative half wave signal. Also good.
As a result of the determination, if the detected value is negative (s 37), the CPU 15 sets the
polarity entry to 1 as in the determination result table shown in FIG. 5 on the assumption that
the speaker polarity is incorrect. (S38). If the detected value is positive as a result of the
determination, it is determined that the polarity of the speaker is correct, and 0 is set in the entry
of the polarity of the determination result table (s39). Then, the CPU 15 ends the process. By
performing the process as described above, it is possible to determine a speaker whose polarity is
incorrect. Also, as a simpler configuration, regardless of the distance between the speaker and
the microphone, a sine wave is output from the speaker so as to change from a positive value to a
negative value, and a sine wave signal collected by the microphone is first It may be a method of
04-05-2019
11
monitoring whether it is a positive signal or a negative signal. In addition to the method
described above, a method of sequentially checking whether the adjacent speakers have the
polarity may be used as the speaker polarity inspection method. However, this check method is
valid only when the following preconditions are satisfied. 【0080】 1. Misdirected
speakers are a small number for the entire array speaker system 1. 【0081】 2.
Loudspeakers with wrong polarity are not continuously adjacent to each other, and the distance
between the speakers in the order of the speakers is 3 or more. In addition, two adjacent
speakers can be regarded as having the same distance to the microphone. Here, since the
inspection of the broken speaker is not performed, it may be possible to inspect the two speakers
with the broken speaker in between as a pair.
In this case, the distance between the two speakers with the broken speaker in between is
considered to be the same as the distance between two adjacent speakers, and the distance from
the speaker to the microphone is considered to be the same. Next, an embodiment of the method
of determining the polarity of the above array speaker device will be described. In the following
description, a case will be described in which the polarity determination is performed on the
array speaker device 1 having no speaker in a disconnected state. In this polarity determination
method, an inspection is performed on a certain speaker in pairs with one adjacent speaker, and
then in a pair with the other adjacent speaker. FIG. 12 is a flowchart for explaining another
polarity determination method of the array speaker device. FIG. 13 is a schematic view and a
polarity check table of another polarity determination method of the array speaker device. As
shown in FIG. 12, the CPU 15 sets the initial value of i to i = 0 and starts the primary check of the
polarity check on each speaker of the array speaker device 1 (s 41). The CPU 15 increments the
value of i by 1 (i = i + 1) and sets n (n is an even number). The speaker 11 generates a sine wave
of a predetermined frequency by the DSP 11 with respect to the two speakers of the speaker SP
(2i-1) and the speaker SP (2i) among the speakers SP1 to SPn)), and the same sound is output
from these speakers Output (s42). The CPU 15 collects the sound output from the two speakers
SP (2i−1) and the speaker SP (2i) with the microphone 6, performs DFT processing on the signal
of the sound, and Obtain a spectrum (s43). Further, the CPU 15 compares the magnitude
relationship between the value of this spectrum and a predetermined threshold value th set in
advance (s44). As shown in FIG. 13A, if there is a polarity error in any of the two speakers, the
sound waves are mutually canceled to reduce the spectrum. When the spectrum is thus equal to
or less than the predetermined threshold th, the CPU 15 sets the primary check entry of the
speaker SP (2i-1) and the speaker SP (2i) in the polarity check table stored in the RAM 16 as
shown in FIG. As shown in B), 1 is set (s45). Then, the CPU 15 performs the process of s47. On
the other hand, if there is a polarity error in any of the two speakers, the spectrum has a value
larger than the predetermined threshold th, so the speaker SP (2i-1) in the polarity check table
shown in FIG. 8B. And 0 in the primary check entry of the speaker SP (2i) (s46).
04-05-2019
12
Then, the CPU 15 performs the process of s47. Next, the CPU 15 determines whether i = n / 2
(s47). If i is not n / 2, the process of s42 is performed. On the other hand, if i = n / 2, the process
of s48 is performed. First, the CPU 15 sets the initial value of i to i = 0, and performs a secondary
check of the polarity check (s 48). Then, the CPU 15 increments the value of i by 1 (i = i + 1) and
sets n (n is an even number). The sine wave of a predetermined frequency is generated and
output by the DSP 11 with respect to two speakers of the speaker SP (2i) and the speaker SP (2i
+ 1) among the speakers SP1 to SPn)) (s49). The CPU 15 detects signals output from the two
speakers SP (2i) and the speaker SP (2i + 1) with the microphone 6, and obtains the spectrum of
the corresponding frequency by DFT (s50). Further, the CPU 15 compares the magnitude
relationship between the value of this spectrum and the predetermined threshold value th set in
advance (s51). If there is a polarity error in any of the two speakers, the spectra will be smaller
because they cancel each other's sound waves. Therefore, the CPU 15 sets 1 in the secondary
check entries of the speaker SP (2i-1) and the speaker SP (2i) in the polarity check table shown in
FIG. s52). Then, the CPU 15 performs the process of s54. On the other hand, if the polarity error
occurs in any of the two speakers, the spectrum has a value larger than a predetermined
threshold. Therefore, the CPU 15 sets 0 in the primary check entry of the speaker SP (2i-1) and
the speaker SP (2i) in the polarity check table shown in FIG. 8B (s53). Then, the CPU 15 performs
the process of s54. Next, the CPU 15 determines whether i = (n / 2) −1 (s54). If i = (n / 2) −1,
the CPU 15 performs the process of s49. On the other hand, if i = (n / 2) −1, the CPU 15
performs the process of s55. The CPU 15 calculates the AND of the primary check entry and the
secondary check entry of the polarity check table in the speakers SP (2) to SP (n-1), and the
result is as shown in FIG. It stores in the determination result entry (s55). It is to be noted that,
since the speaker SP (1) has not performed the secondary check, when the result of the primary
check is 1 and the determination result of the speaker SP (2) is 0, in the determination result
entry Set 1
Further, since the speaker SP (n) has not performed the secondary check, if the result of the
primary check is 1 and the determination result of the speaker SP (n-1) is 0, 1 is added to the
determination result entry. Set Then, the CPU 15 ends the process. By the process as described
above, as shown in FIG. 13B, it can be determined that the one in which 1 is set in the
determination result entry is a polarity error. Next, the procedure for notifying the determination
result of the polarity error will be described. FIG. 14 is a flowchart for explaining a procedure in
which the inspection apparatus notifies the inspector of the result of the speaker polarity
determination. The determination result of the polarity error may be notified to the inspector
together with the determination result of the disconnection. As shown in FIG. 14, the CPU 15 of
the inspection apparatus 30 checks the presence / absence of a speaker determined to be
defective as a polarity error in the determination result table (s61). When there is a speaker of
defect determination in which 1 is set in the item of the polarity, the CPU 15 acquires the
number of the speaker (s62). In the determination result table shown in FIG. 6, the polarity of the
second speaker is incorrect. The CPU 15 reads out data for conveying the inspection result from
04-05-2019
13
the phoneme data stored in the ROM 17 based on the acquired speaker number, and combines
the data (s 63). For example, data of the phoneme data b “polarity is different” shown in FIG. 9
and data of “2” of the phoneme data c are read out and these phoneme data are combined.
The CPU 15 outputs the phoneme data to the DAC block 13. The DAC block 13 outputs an audio
that conveys the inspection result that “the polarity difference is 2” via the amplifier and the
speaker determined to be non-defective (s 64), and the processing is ended. On the other hand,
as a result of checking the determination result table in step s 61, as a result of checking the
determination result table in step s 61, when there is no speaker in which 1 is set in the item of
polarity error, as shown in FIG. The data of the phoneme data b “Polarity difference” and the
data of the phoneme data e “No” are read out and these phoneme data are combined (s 65).
Then, the CPU 15 outputs the phoneme data to the DAC block 13. The DAC block 13 outputs an
audio “there is no polarity difference” via the amplifier and the speaker determined to be nondefective (s66), and ends the processing.
As described above, the examiner can grasp that the second speaker in the array speaker
apparatus has a polarity error. In the wiring check process in the manufacturing process, the
polarity error of the speaker is detected in this manner, the speaker polarity is properly repaired,
and the product which is OK in the recheck is shipped as a product. The check process is
automated and can be easily checked because a bad state can be determined by voice. Next, a
modified example of the present configuration will be described. FIG. 15 is a perspective view of
an array speaker apparatus in which a microphone is installed in an enclosure. In the above
description, the example in which the microphone 6 is installed outside has been described.
However, since the sound of the speaker can be detected in the enclosure, even in the
configuration in which the microphone is installed inside the housing of the array speaker device
1, Conducts inspection of wiring and speaker polarity. For example, as shown in FIG. 9, by
installing a microphone on the main substrate 41 in the array speaker apparatus 1, the sound
output from the speaker can be detected from the back surface of the speaker. As described
above, if the voice output from the speaker is detected inside the array speaker device 1, there is
no need to install a microphone outside for inspection, so the examiner can use only the array
speaker device 1 that has been assembled. Since checking is possible, convenience is enhanced.
In the above description, although an example in which all Fourier frequency analysis is
automatically performed in the array speaker apparatus has been described, the present
invention is not limited thereto. For example, the detection sound of a microphone may be
detected using an external spectrum analyzer. It is also possible to use a method of visual
identification. Further, as a method of checking for disconnection of speakers, phoneme data of
numbers corresponding to the number of speakers are prepared, and each speaker is set to
sequentially output sound of the speaker number, and the examiner sets the speaker number It is
also conceivable to check the speakers that are not output. For example, when testing eight
speakers, when the voices “1, 2, 3, 4, 6, 7, 8” are output from the array speaker device, only
the voice of 5 is not output, so 5 It can be determined that the speaker of No. is disconnected.
04-05-2019
14
According to the present invention, the following effects can be obtained. (1) Since the
connection state of the speaker is inspected based on the value obtained by converting the sound
output from each speaker of the array speaker into the frequency domain component, it can be
easily configured and the control is simple, and the determination procedure is Clearly separable,
accurate connection status check.
(2) Since test voice signals of different frequencies are simultaneously generated for a plurality of
speakers and the test voice is output from each speaker, the connection state of a plurality of
speakers is determined in a short time can do. (3) The test sound of the speaker collected by the
sound collection means is converted into the value of the frequency domain component, and the
determination is performed by comparing with a predetermined threshold, so that the connection
state of the speaker can be easily determined. (4) The erroneous determination of the nondefective product can be prevented by checking one by one whether or not there is an erroneous
determination for the devices determined to be defective in the speaker connection inspection.
(5) Since the result of the determination of the connection state of the plurality of speakers can
be notified by voice, the examiner can easily grasp the determination result. (6) The polarity of
each of the speakers constituting the array speaker can be easily determined. (7) Since the result
of determination of the state of polarity of a plurality of speakers can be notified by voice, the
examiner can easily grasp the determination result. (8) Since the array speaker apparatus is
provided with an apparatus for inspecting the wiring and polarity of the array speaker, not only
the inspection at the time of completion of manufacture but also the user even when a problem
occurs during use of the user Since the inspection can be carried out without taking the
inspection device to the place of, it is possible to find and repair the defect immediately. Also, in
some cases, after the user inspects the array speaker by inspection, the inspection result can be
notified to the manufacturer to request repair. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is
an external view of an array speaker apparatus to be inspected by an array speaker inspection
apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram of an
array speaker apparatus. FIG. 3 is a schematic diagram of frequency conversion of sine waves
different in frequency output from four speakers by DFT to determine connection failure; FIG. 4
is a diagram showing a method of setting a threshold. FIG. 5 is a flowchart for describing a
determination processing procedure of wiring in each speaker of the array speaker device. FIG. 6
is a determination result table. FIG. 7 is a flowchart for explaining a secondary check method of
the speaker. FIG. 8 is a flowchart for describing a procedure in which the inspection apparatus
notifies an inspector of the result of the speaker connection determination. FIG. 9 is a diagram
showing an example of phoneme data. FIG. 10 is a flowchart for describing a procedure in which
an inspection apparatus performs a polarity test on each speaker of the array speaker apparatus.
FIG. 11 is a diagram showing a positional relationship between a speaker that has output an
impulse signal and a microphone. FIG. 12 is a flow chart for explaining another polarity
04-05-2019
15
determination method of the array speaker device. FIG. 13 is a conceptual diagram and another
polarity check table of another polarity determination method of the array speaker device. FIG.
14 is a flowchart for describing a procedure in which the inspection apparatus notifies an
inspector of the result of the speaker polarity determination. FIG. 15 is a perspective view of the
array speaker apparatus with the microphone installed in the enclosure. Explanation of code 1array speaker device 2-speaker 3-microphone input terminal 4-signal input terminal 5-operation
section 6-microphone 11-DSP 12-ADC 13-DAC block 14-ADC 15-CPU 16-ROM 17 -RAM 18-OSC
block 19-changeover switch 22-digital signal input terminal 23-analog signal input terminal 24microphone input terminal 25-bus line 30-inspection device In2, In4-inverter Amp1-Amp4amplifier SP1-SP4-speaker
04-05-2019
16
Документ
Категория
Без категории
Просмотров
0
Размер файла
36 Кб
Теги
jp2004297368
1/--страниц
Пожаловаться на содержимое документа