close

Вход

Забыли?

вход по аккаунту

?

JP2010221847

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 JP2010221847
The present invention provides an on-vehicle acoustic device capable of masking noise generated
by engine rotation of a vehicle with voice and outputting the voice in an easy-to-hear manner.
SOLUTION: A ripple detection unit 2 for detecting a ripple voltage to be superimposed on a
battery voltage supplied to an on-vehicle acoustic device power supply unit 12, a microcomputer
10 for calculating an engine rotational speed from detected ripple frequency information, a
sound volume of sound And a voice processing unit 3 for adjusting frequency characteristics, and
automatically adjust the volume and frequency characteristics of the voice according to the
engine speed. [Selected figure] Figure 1
In-vehicle acoustic device and control method of in-vehicle acoustic device
[0001]
The present invention relates to an on-vehicle acoustic device mounted on a vehicle, capable of
automatically adjusting the volume and frequency characteristics of reproduced sound, masking
noise in a vehicle interior due to engine rotation with the sound, and outputting desired sound in
an easy-to-hear manner.
[0002]
Heretofore, the followings have been used to automatically adjust the sound characteristics such
as the level (volume) and frequency characteristics (sound quality) of the sound output from the
sound device and to mask the noise to make it easier to hear the desired sound: Proposed.
[0003]
08-05-2019
1
In some cases, the vehicle speed calculation processing unit of the microcomputer calculates the
vehicle speed from the vehicle speed pulse signal, stores this vehicle speed in association with
the set volume, and repeats this storage to obtain certain data. The volume corresponding to the
vehicle speed is read, and an audio signal from a sound source is automatically set to this volume
by the volume adjustment unit (see, for example, Patent Document 1).
[0004]
Another one is provided with a noise collection microphone built in a vehicle-mounted sound
reproduction device for collecting vehicle interior noise, and a microphone characteristic
compensation means for compensating the amplitude frequency characteristic of the detected
noise signal. The noise characteristic of the listener's ear position is estimated from the noise
signal of the built-in microphone, and the amplitude frequency characteristic of the noise signal
is compensated (for example, see Patent Document 2).
[0005]
Still other ones detect the engine rotational speed, the vehicle speed, the accelerator opening, and
the position information as the traveling state of the vehicle, and reference the noise level in the
vehicle by referring to the prepared database based on the detected traveling state. In
accordance with the estimated noise level, the acoustic characteristics of the microphone and the
speaker, that is, the microphone sensitivity, the microphone directivity, and the speaker volume
are set (for example, see Patent Document 3).
JP-A-9-160570 JP-A-9-148867 (Paragraph 0010, FIG. 2) JP-A-2008-153743
[0006]
However, the above-mentioned prior art had the following problems.
[0007]
That is, even if it is a vehicle traveling at the same vehicle speed, for example, as in the one
described in Patent Document 1, the rotation of the engine between traveling on a flat surface
and traveling on an ascending slope Although the numbers are different and the noise level in
the passenger compartment is different, in the case of using the vehicle speed pulse, both are
regarded as the same condition and accurate masking of the noise can not be performed.
08-05-2019
2
[0008]
Further, in the case of using a microphone as described in Patent Document 2, it is necessary to
attach a dedicated microphone to the vehicle, and the cost for parts and attachment increases.
[0009]
Furthermore, as for the one described in Patent Document 3 that uses information on the engine
speed of the vehicle and the accelerator opening degree, it is necessary to newly provide a signal
line for inputting such information into the acoustic device. There is a problem that a large-scale
process and cost are required, and when using position information of a vehicle, in order to be
adopted in devices such as audio without a navigation function, it is equipped with a GPS (Global
Positioning System) or the like. The problem is that the cost is high.
[0010]
The present invention has been made to solve the above-described conventional problems, and
its object is to provide a vehicle-mounted acoustic device capable of accurately masking noise in
a vehicle interior due to engine noise by automatic adjustment of acoustic characteristics. To
offer at low cost without making any changes.
[0011]
A vehicle-mounted acoustic device according to the present invention is a vehicle-mounted
acoustic device connected to a battery mounted on a vehicle and supplied with power from the
battery, wherein the ripple detection unit detects a ripple frequency of a ripple voltage
superimposed on the output voltage of the battery The rotation speed of the engine of the vehicle
is calculated from the ripple frequency detected by the ripple detection unit, and the volume and
the sound quality of the audio output outputted from the own device are controlled according to
the volume correction value corresponding to the calculated rotation speed. And a control unit.
[0012]
With this configuration, the number of revolutions of the engine of the vehicle is calculated from
the frequency of the ripple voltage superimposed on the power supply line supplied to the own
device to control the volume and the sound quality of the output voice of the own device. The
masking of noise can be realized inexpensively without any change or addition of equipment to
the vehicle.
[0013]
08-05-2019
3
Further, in the on-vehicle acoustic device of the present invention, the ripple detection unit may
include a filter unit that passes only a specific frequency component of the input voltage, and a
ripple that passes the filter and amplifies the voltage output from the filter. An amplifier and a
ripple detector connected to the ripple amplifier for detecting the ripple frequency of the voltage
output from the ripple amplifier and outputting it as ripple frequency information are included.
[0014]
With this configuration, the frequency of the ripple voltage superimposed on the power supply
line is accurately detected without being affected by the noise voltage superimposed on the
power supply line due to driving of the load, etc. The number can be calculated accurately.
[0015]
Furthermore, in the on-vehicle acoustic device of the present invention, the control unit may
control the noise level of the engine when the engine of the vehicle is not rotating when the
vehicle is in a stopped state and the engine speed of the vehicle is a predetermined number of
revolutions. The memory has a memory in which the difference between the noise level and the
noise level is recorded for each of the predetermined number of revolutions and for each
frequency of the noise, and the control unit uses the information stored in the memory to output
the audio output It has a configuration to control the volume.
[0016]
With this configuration, the correction value information recorded in the memory is referred to
according to the calculated engine rotational speed information, and the volume and the sound
quality of the audio output are automatically controlled. Can be masked.
[0017]
The present invention calculates the engine speed from the ripple voltage superimposed on the
battery voltage, and automatically adjusts the acoustic characteristics of the sound according to
the engine speed, so that the noise in the passenger compartment due to the engine sound is An
object of the present invention is to provide an on-vehicle acoustic device that can be accurately
masked by automatic adjustment at low cost without making any change to vehicle equipment.
[0018]
Hereinafter, embodiments of the present invention will be described with reference to the
08-05-2019
4
drawings.
The configuration of the on-vehicle acoustic device according to the embodiment of the present
invention is shown in FIG.
[0019]
In FIG. 1, the on-vehicle acoustic device 1 of the present invention is mainly configured by adding
a ripple detection unit 2 and an audio processing unit 3 to a general on-vehicle acoustic device.
[0020]
The ripple detection unit 2 is a filter 4 capable of passing only a specific frequency component of
the input voltage, and a ripple amplifier connected to the filter 4 to amplify the voltage output
from the filter 4 through the filter 4 And a ripple detector 6 which is connected to the ripple
amplifier 5 and can detect the ripple frequency of the voltage output from the ripple amplifier 5
and output it as information using a voltage value or the like.
[0021]
Furthermore, the ripple detection unit 2 is internally connected to the filter 4 and the on-vehicle
acoustic device power supply unit 12 that supplies power to the respective units of the onvehicle acoustic device 1.
The on-vehicle acoustic device power supply unit 12 is connected to the vehicle power supply
unit 13 via the power supply harness 14.
Here, the vehicle power supply unit 13 and the power supply harness 14 can be those which are
conventionally provided when the vehicle-mounted acoustic device is used in the vehicle.
[0022]
Further, the on-vehicle acoustic device 1 includes an audio processing unit 3 for processing a
sound source for outputting an audio signal or an audio signal into a desired signal and
outputting the audio signal.
08-05-2019
5
[0023]
The audio processing unit 3 is connected to a sound source 7 for generating an audio signal for
the user to enjoy in the vehicle compartment and to the sound source 7, and the level (volume) of
the audio signal or the frequency characteristic (sound quality) of the audio signal as acoustic
characteristics. And an audio amplifier 9 connected to the audio processing unit 8 to amplify the
power of the audio signal output from the audio processing unit 8.
[0024]
The sound processing unit 8 is connected to a microcomputer 10 for controlling the whole of the
in-vehicle acoustic device 1. The microcomputer 10 is provided with keys and buttons for
operating the in-vehicle acoustic device 1 or an encoder. The operation unit 11 is connected.
Thereby, when the user operates the operation unit 11, an operation signal is sent to the sound
processing unit 8 through the microcomputer 10, and the sound signal output from the sound
source is the sound volume and sound quality of the user's preference in the sound processing
unit 8. The voice signal is amplified by the voice amplifier 9, and the amplified voice signal is
output as voice from the speaker 15 connected to the voice amplifier 9.
[0025]
Further, the microcomputer 10 and the ripple detector 6 are electrically connected, and the
sound processing unit 8 adjusts the acoustic characteristic according to the state of the ripple
detected by the ripple detector 6 as described later in detail. The microcomputer 10 performs
control.
[0026]
Here, the sound source 7 is, for example, a radio tuner or a television tuner which converts a
received broadcast signal of a radio or a broadcast signal of a television into an audio signal and
outputs it, or a cassette tape player, disc type media such as CD, DVD or SD. A disk media player
for playing back, a digital audio player using a flash memory or a small hard disk as a recording
medium, or an external voice input may be connected, and a plurality of them may be connected.
[0027]
The sound source 7, the sound processing unit 8 and the microcomputer 10 require a power
08-05-2019
6
supply to operate, so they are connected to the on-vehicle acoustic device power supply unit 12
by wires not shown, respectively, and the vehicle via the on-vehicle acoustic device power supply
unit 12 Power supply power is supplied from the power supply unit 13.
[0028]
Next, the configuration of the vehicle power supply unit 13 in a general automobile is shown in
FIG.
In FIG. 2, the vehicle power supply unit 13 is connected to the engine 16 that burns gasoline and
the like to generate power, the belt 18 connected to the engine 16 via the pulley 17 to transmit
power, and the belt 18 via the pulley 19. And a battery 21 connected to the alternator 20 and
storing the DC power generated by the alternator 20.
[0029]
The alternator 20 generates electric power and stores it in a battery, and is connected to an AC
generator 22 for converting a part of the power generated by the engine 16 into AC power, and
is connected to the AC generator 22 to convert AC voltage to DC voltage. And a smoothing unit
24 connected to the rectifying unit 23 to bring the voltage closer to a direct current.
[0030]
The electric power (battery electric power) generated by the alternator 20 and stored in the
battery 21 is supplied to the on-vehicle acoustic device power supply unit 11 through the power
supply harness 14 and another not shown through another not-shown power supply harness. It
is also supplied to automotive electrical components.
[0031]
Next, the operation of the vehicle power supply unit 13 will be described with reference to FIG.
FIG. 3 is a diagram showing a voltage waveform in each part of the vehicle power supply unit 13.
The vertical axis represents voltage V, and the horizontal axis represents time t.
08-05-2019
7
[0032]
The power generated by the engine 16 drives the AC generator 22 through the pulley 17, the
belt 18, and the pulley 19, and the power is converted into AC power.
A three-phase alternating current generator is generally used as the alternating current
generator 22, and three outputs (three-phase alternating current voltages) are obtained as
outputs. The waveforms L1, L2, and L3 in FIG. As such, each voltage waveform is sinusoidal.
At this time, the relationship between the rotational speed Fe (Hz) of the engine 16 and the
rotational speed Fd (Hz) of the AC generator 22 depends on the ratio of the diameter R1 of the
pulley 17 to the diameter R2 of the pulley 19 (pulley ratio M = R2 / R1) It is decided that Fe = M ·
Fd.
In a general vehicle, M is about 2 to 3.
[0033]
Furthermore, since the three-phase AC voltage output from the AC generator 22 is full-wave
rectified by the rectifier 23 comprising, for example, a diode bridge, its voltage waveform is
shown by the waveform L4 (solid line portion) in FIG. It becomes a pulsating current voltage
waveform.
The pulsating voltage is further smoothed by the smoothing unit 24 and the battery 21 to
become a battery voltage, and is supplied to a load such as an acoustic device.
The waveform of the battery voltage should ideally be smoothed into a DC voltage waveform as
shown by the waveform L5 in FIG. 3D, but the effect of the load connected to the vehicle power
supply unit 13 etc. is actually Not a perfect direct current.
That is, a ripple voltage having a waveform close to a sine wave having the maximum value
08-05-2019
8
shown in phantom line L6 and the minimum value shown in phantom line L7 in FIG. 3 (c) is
superimposed on the actual battery voltage. The frequency (ripple frequency) Fr is a value (Fr = 3
Fd) obtained by multiplying the number of revolutions Fd of the AC generator 22 by 3 which is a
rectification ratio.
[0034]
Next, the ripple detection operation of the present invention will be described using FIG. 4 and
FIG.
FIG. 4 is a diagram showing a voltage waveform chart in each part of the ripple detection unit 2
of the present invention, in which the voltage V is on the vertical axis and the time t is on the
horizontal axis.
FIG. 5 is a diagram showing the band characteristic of the filter 4 in the ripple detection unit 2.
[0035]
FIG. 4A shows an example of a battery voltage waveform in an actual vehicle, and as shown in
the figure, in addition to the ripple voltage, a noise voltage generated by, for example, driving of
a load is superimposed on the actual battery voltage. doing.
[0036]
The frequency spectrum of the battery voltage includes the DC voltage and low frequency noise
voltage bands indicated by B1 in FIG. 5, the ripple voltage band indicated by B2 in FIG. 5, and the
high frequency noise voltage band indicated by B3 in FIG. It consists of three bands.
[0037]
The filter 4 in the ripple detection unit 2 according to the present invention is composed of, for
example, a passive filter unit combining a coil and a capacitor, or an active filter unit consisting
of an operational amplifier, and selects the band B2 as shown by the waveform L10 in FIG.
Because it has a band characteristic to pass through, when the battery voltage shown in FIG. 4 (a)
is input to the filter 4, only the ripple voltage shown in FIG. 4 (b) is output.
08-05-2019
9
Further, this ripple voltage is amplified to a voltage having a waveform as shown in FIG.
[0038]
At this time, if an AGC (Auto Gain Control) circuit (not shown) is used, the amplification factor of
the ripple amplifier 5 is controlled according to the ripple voltage value after amplification, and
amplification is performed to a fixed value so that the ripple voltage is not saturated. it can.
[0039]
Further, this amplified ripple voltage is converted into a pulse signal shown in FIG. 4 (d) by the
ripple detector 6 which is, for example, a hysteresis comparator.
As is clear from the relationship between FIG. 4C and FIG. 4D, the frequency of this pulse signal
is the same as the frequency of the ripple voltage (the pulse signal has ripple frequency
information).
Therefore, this pulse signal output from the ripple detector 6 is input to the input port of the
microcomputer 10, and the ripple frequency Fr of the battery voltage is accurately calculated
from the number of pulses per unit time.
[0040]
As described above, when the ripple frequency Fr of the battery voltage is calculated in the
microcomputer 10, the rotational speed Fe of the engine 16 is obtained as Fe = (1 / 3M) · Fr from
the above-mentioned equation.
[0041]
The microcomputer 10 has a built-in memory (not shown), and the built-in memory controls the
sound processing unit 8 according to the engine speed Fe so as to most effectively mask the
engine sound in the vehicle compartment. The acoustic characteristic correction value table
(hereinafter referred to as a correction value table) is recorded in advance.
08-05-2019
10
FIG. 7 is a diagram showing an example of the correction value table.
The correction value table may be recorded in an external memory (not shown) provided so as to
be connectable to the microcomputer 10.
[0042]
Hereinafter, an example of a method of determining the correction value table will be described
with reference to FIG.
[0043]
FIG. 6 is a characteristic diagram of engine sound observed using FFT (Fast Fourier Transform) in
a vehicle.
[0044]
In FIG. 6, L8 and L9 are FFT diagrams showing the noise level of the stopped state of the vehicle
on which the in-vehicle acoustic device 1 is mounted, and L8 is in the passenger compartment
when the number of revolutions of the engine 16 of the vehicle is 3,000. It is an FFT figure which
shows the noise level observed.
L9 is an FFT diagram showing the noise level when the engine 16 is not rotating.
[0045]
Based on this FFT diagram, for example, the volume correction value of the voice is determined
to be equal to the average value of the level difference between L8 and L9, and the frequency
characteristic correction value of the voice is further equalized to the level difference for each
frequency. By determining, for example, a correction value at an engine speed of 3000 as shown
in FIG. 7 is obtained.
08-05-2019
11
Similarly, with regard to the other rotational speeds, using the FFT diagram, it is possible to
obtain the correction value of the correction value table according to the engine rotational speed,
and using the obtained correction values, control of the volume and the sound quality is
performed.
[0046]
About the vehicle-mounted acoustic apparatus 1 comprised as mentioned above, the operation |
movement is demonstrated using FIG.
[0047]
FIG. 8 is a flowchart showing an acoustic characteristic automatic adjustment operation of the
on-vehicle acoustic device 1 in the embodiment of the present invention shown in FIG.
[0048]
When the user operates the operation unit 11 or the power of the in-vehicle acoustic device 1 is
turned on in synchronization with the start of the vehicle, the audio signal reproduced from the
sound source 7 is the audio processing unit 8, audio amplifier 9, At the desired sound quality and
volume, the sound is output from the speaker 15 into the vehicle compartment (step S1).
[0049]
Subsequently, the ripple frequency of the ripple voltage superimposed on the battery voltage is
detected in the ripple detection unit 2 (step S2), and the rotational speed of the engine 16 is
calculated in the microcomputer 10 based on the detected ripple frequency information. (Step
S3).
[0050]
When the calculation of the number of revolutions of the engine 16 is completed in step S3, the
microcomputer 10 refers to the correction value table described above, and reads an acoustic
correction value corresponding to the number of revolutions of the engine 16 (step S4).
[0051]
The correction value is transmitted from the microcomputer 10 to the sound processing unit 8 as
a sound control signal, and the sound processing unit 8 adjusts the sound characteristic by using
the correction value for the sound signal reproduced at that time. Then, the engine sound is
masked by the sound output from the speaker 15 (step S5).
08-05-2019
12
[0052]
After that, the on-vehicle acoustic device 1 shifts to a standby state for performing other
processing such as waiting for user operation reception, and a timer (not shown) starts timing,
and waits for a predetermined time t to elapse. continue.
(ステップS6)。
[0053]
When time t passes in step S6, the process returns to step S2 again, and adjustment of acoustic
characteristics is performed.
Here, by setting the value of time t arbitrarily, the followability of the adjustment of the acoustic
characteristic to the change of the noise of the engine 16 of the present invention can be
determined. For example, real-time acoustic can be achieved by setting the value sufficiently
small such as several hundred ms. Since the characteristic can be adjusted, the noise from the
engine 16 is always masked, and the user can enjoy the sound in an easily audible manner.
[0054]
In addition, it is also possible to change an acoustic characteristic according to a user's
preference by operating the operation part 11 in the other process of step S6.
[0055]
In the microcomputer 10, the correction value adjusted using the correction value table and the
volume value manually adjusted by the user are held in separate memories respectively, and the
sum of the two values is sent to the acoustic processing unit 8 as an acoustic control signal. As it
is configured to be transmitted, when the number of revolutions of the engine 16 is low and the
influence of the noise of the engine 16 is small, the voice is reproduced with the user's favorite
acoustic characteristics, and when the noise of the engine 16 is large, the voice is Sound is
reproduced with acoustic characteristics that are easy to hear.
08-05-2019
13
[0056]
As described above, according to the on-vehicle acoustic device of the embodiment of the present
invention, the rotational speed of the engine 16 of the vehicle on which the on-vehicle acoustic
device 1 is mounted is provided by providing the ripple detection unit 2 that detects the
frequency of the ripple voltage. Since the volume correction of the output voice according to the
number of revolutions of the engine 16 is performed, noise in the passenger compartment due to
the engine sound can be accurately masked without changing the equipment on the vehicle side.
[0057]
Furthermore, the on-vehicle acoustic device according to the embodiment of the present
invention is advantageous in that control can be accurately performed by simple signal
processing, unlike the case where volume correction is performed using an audio signal collected
by a microphone or the like. have.
[0058]
That is, in the case of performing volume correction using an audio signal collected by a
microphone or the like, if the type of noise collected by the microphone is not analyzed, for
example, the user's conversation is regarded as noise and the reproduction volume of the audio is
If there is a possibility of malfunction that increases and disturbs the user's conversation, while
performing noise analysis, digital conversion of voice and complicated signal processing are
required, so the scale of the department increases and the cost is increased It will be.
[0059]
On the other hand, according to the vehicle-mounted acoustic device of the embodiment of the
present invention, it is possible to eliminate other voices other than the engine sound such as the
user's conversation, etc. Further, the engine rotational speed is determined from the ripple
frequency. The volume control can be realized only by a simple calculation.
[0060]
Furthermore, in the case of performing volume correction using position information, in order to
accurately estimate the noise level in the vehicle compartment including the engine sound from
the position information, the inclination of the road surface, the road surface condition,
surrounding terrain, etc. A large amount of information needs to be collected into a database, and
in addition to the fact that the time and effort for collecting information becomes enormous, a
large capacity memory for storing the data is required. According to the on-vehicle acoustic
device of the embodiment, the volume control can be realized with a simple configuration in
08-05-2019
14
which the correction value table of the acoustic characteristic is stored in advance according to
the engine rotational speed.
[0061]
As described above, the on-vehicle acoustic device according to the present invention adds some
modification to the vehicle equipment that can accurately mask the noise in the vehicle
compartment due to the engine sound by the automatic adjustment of the acoustic
characteristics. It has the effect that it can be realized inexpensively, and it can be mounted on a
vehicle, automatically adjust the volume and frequency characteristics of the sound to be
reproduced, mask the noise in the passenger compartment by the engine rotation with the sound,
and output the desired sound easily It is useful as a vehicle-mounted acoustic device etc.
[0062]
A block diagram showing a configuration of a vehicle-mounted acoustic device according to an
embodiment of the present invention A block diagram showing a configuration of a vehicle
power supply unit according to the present embodiment (a) Output voltage waveform of an AC
generator of the vehicle power supply unit according to the present embodiment The figure
which shows (b) The output voltage waveform of the rectification part of the vehicle power
supply part in this embodiment (c) The figure which shows the voltage waveform of the battery
voltage in this embodiment (d) The ideal voltage waveform of a battery voltage (A) A diagram
showing the voltage waveform of the battery voltage in the present embodiment (b) A diagram
showing the output voltage waveform of the filter of the ripple detection unit in the present
embodiment (c) A ripple detection unit in the present embodiment (D) showing an output voltage
waveform of the ripple amplifier of the second embodiment. (D) A diagram showing an output
voltage waveform of the ripple detector of the ripple detection unit according to the present
embodiment. Figure showing an example of flexibility FFT graph of engine sound observed in a
general vehicle Figure showing an example of correction value of acoustic characteristic in the
present embodiment flow showing control flow of acoustic characteristic in the embodiment of
the present invention Figure
[0063]
DESCRIPTION OF SYMBOLS 1 in-vehicle acoustic device 2 ripple detection part 3 audio
processing part 4 filter 5 ripple amplifier 6 ripple detector 7 sound source 8 acoustic processing
part 9 audio amplifier 10 microcomputer 11 operation part 12 in-vehicle acoustic device power
supply part 13 vehicle power supply part 14 power supply harness 15 speaker 16 Engine 17
Pulley 18 Belt 19 Pulley 20 Alternator 21 Battery 22 Alternator 23 Rectifying Part 24 Smoothing
Part
08-05-2019
15
08-05-2019
16
Документ
Категория
Без категории
Просмотров
0
Размер файла
27 Кб
Теги
jp2010221847
1/--страниц
Пожаловаться на содержимое документа