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JP2003274498

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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
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DESCRIPTION JP2003274498
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio apparatus, and more particularly to an audio apparatus having a function (Auto TCR
function) for causing sounds from speakers to simultaneously reach a listening point.
[0002]
2. Description of the Related Art In an audio apparatus provided with a large number of speakers,
for example, an on-vehicle audio apparatus having speakers on the front side left / right, rear
side left / right, front center, etc. The distance to the ear of the is different. If the distance from
the speaker to the listening point is different, even if sounds are generated simultaneously from
each speaker, the time for the sound to reach the driver's ear is different, and the sense of reality
such as music is reduced, and the user can not enjoy the music comfortably .
[0003]
For this reason, a function called Auto TCR (Time Correction) is provided in the car audio system.
The Auto TCR function measures the transfer time of the audio signal from each speaker to the
listening point by receiving the test signal output from each speaker with the microphone
installed at the listening point, and uses the result to measure from each speaker It is a function
that performs time correction on the output audio signal, thereby canceling the difference in
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1
distance between each speaker and the listening point. That is, the Auto TCR function measures
the transmission time from each speaker to the listening point, determines the maximum
transmission time among the transmission times, and transmits the audio signal input to each
speaker from each speaker to the listening point The sound from each speaker is made to reach
the listening point at the same time by delaying the time according to the difference between the
maximum transmission time and the maximum transmission time.
[0004]
FIG. 3 is a block diagram of a conventional apparatus for measuring the transmission time from a
speaker to a listening point, which outputs a pulse PL or VOL / TONE control signal as a
reference for measurement of the transmission time, and captures a microphone detection signal
MDTS. Microcomputer 1 for measuring transmission time, Amplifier (Amp-a) 2 for amplifying
pulse (test signal) PL from microcomputer 1 and VOL / TONE control part 3 for variably
controlling volume / sound quality (VOL / TONE) of audio signal , An amplifier (Amp-b) 4 for
driving a speaker, a speaker 5 which receives an audio signal and radiates a sound into a vehicle
interior space, a listening position, for example, a headrest of a driver's seat, the sound radiated
from the speaker A microphone 6 for detection and an amplifier (Amp-c) 7 for amplifying a
detection signal MDTS of the microphone are included.
[0005]
The pulse PL output from the microcomputer 1 is input to the speaker 5 via the amplifier 2 →
VOl / TONE control unit 3 → amplifier 4 and the speaker emits a sound according to the pulse to
the vehicle interior space, and the microphone 6 generates the sound To detect
The amplifier 7 amplifies the microphone detection signal, and the microcomputer 1 takes in the
microphone detection signal via the A / D terminal. The microcomputer 1 samples the
microphone detection signal MDTS input to the A / D terminal simultaneously with the output of
the pulse PL at predetermined time intervals, for example, every 0.1 msec. When sampling is
completed a prescribed number of times, for example, 100 times (= 10 msec), the time when the
maximum voltage value is acquired during sampling is taken as the transmission time from the
speaker 5 to the listening point. Although only one speaker is shown in FIG. 3, the transmission
time from all the on-vehicle speakers to the listening point can be measured.
[0006]
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2
Among the car audio systems provided with an audio processor having a frequency divider
function, there are those having two systems of front 1 L / R and front 2 L / R as front outputs,
The L / R low band audio signal and the L / R high band audio signal are more output. In such a
system, a tweeter can be connected to the front output terminal 1 L / R. Therefore, in an audio
system having two systems of front 1 L / R and front 2 L / R as front output, a system in which a
speaker other than a tweeter is connected to front output terminal 1 L / R, front output terminal
1 There are two types of systems that connect tweeters to L / R.
[0007]
If the audio system does not have a tweeter connected to it, there is no problem even if the test
signal is input to each speaker in order for a fixed time in order to measure the transmission time
from each speaker to the listening point by the above-mentioned AutoTCR. Does not occur.
However, in an audio system in which a tweeter is connected, the test signal may destroy the
tweeter because the test signal has a large power and the tweeter is sensitive to weak sound.
From the above, it is an object of the present invention to prevent breakage of the tweeter by
reliably identifying that the tweeter is connected and not inputting a test signal to the tweeter in
Auto TCR.
[0008]
SUMMARY OF THE INVENTION According to the present invention, the transmission time from
each speaker to an audio listening point is measured by inputting a test signal to each speaker
and detecting the generated sound with a sensor provided at the listening point. An audio device
provided with a function (AutoTCR function) for setting the difference between the maximum
transmission time of the transmission time and the transmission time from each speaker to the
listening point as the delay time of the audio signal input to each speaker, A means for
requesting execution of a function, a question message output means for outputting a question
message whether a tweeter is connected based on the request, a means for inputting whether a
tweeter is connected, a test signal if the tweeter is not connected And adjust the delay time so
that the sound from each speaker simultaneously reaches the listening point by the above
function. If tweeter is connected, the test signal is input to the speakers other than the tweeter,
and the function execution means is provided to adjust the delay time so that the sound from
each speaker reaches the listening point at the same time by the function. Also, the function
execution means sets the delay time of the audio signal input to the tweeter to the delay time of
the audio signal input to the speaker provided near the tweeter. According to the present
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invention, when there is a request to execute Auto TCR, the user is asked whether the tweeter is
connected or not, and if the user does not answer the question, the measurement of the
transmission time is not performed, but if the question is answered, Measure the transfer time
based on the response. For this reason, since the user can confirm the presence or absence of the
tweeter connection and measure the transmission time, it is possible to prevent the tweeter from
being damaged.
[0009]
DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a block diagram of an audio
apparatus according to the present invention. The audio circuit 10 incorporates an amplifier etc.,
and high frequency audio signals of front L / R channels from output terminals F1L, F1R, low
frequency audio signals of front L / R channels from output terminals F2L, F2R, front from
output terminals C The center audio signal, the subwoofer audio signal from the output terminal
SW, and the rear L / R channel audio signal from the output terminals RL and RR are output.
[0010]
The first speakers 11L and 11R of the front L / R channel are connected to output terminals F1L
and F1R of the audio circuit 10, and the second speakers 12L and 12R of the front L / R channel
are connected to F2L and F2R, A speaker 13 of the front center is connected to the output
terminal C, a subwoofer 14 is connected to the output terminal SW, and speakers 15L and 15R of
rear L / R channels are connected to the output terminals RL and RR. Although the case where
the front speakers 11L and 11R of the front L / R channel are connected to the output terminals
F1L and F1R is shown in the figure, the speakers 11L and 11R may be tweeters, or may be other
than tweeters. It may be a speaker or it may not be connected. A listening point, for example, a
headrest of a driver is provided with a measurement microphone 16 to detect the sound from
each speaker and output it via an amplifier 17. The microcomputer 21 executes Auto TCR
control, and a key unit 22 and a display device 23 are connected to the microcomputer. The key
section 22 is provided with a key 22a requesting execution of the Auto TCR function, a response
key 22b responding "YES" or "NO" to a question from the microcomputer, and the like.
[0011]
When execution of the Auto TCR function is requested from the key unit 22, the microcomputer
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21 displays a question message as to whether the tweeter is connected to the display device 23,
and executes Auto TCR control based on the response from the user to the question. . That is,
when the tweeter is not connected by the response from the user, the microcomputer 21 inputs
the test signal (signal for measurement) to all the on-vehicle speakers to measure the
transmission time from each speaker to the listening point, and The delay time of the audio
signal input to each speaker is determined so that the sound from the speaker simultaneously
reaches the listening point, and input to the DSP (digital signal processor) 24.
[0012]
Further, when the tweeter is connected by the response from the user, the microcomputer 21
does not input the test signal to the tweeter. That is, test signals are not output from the output
terminals F1L and F1R, but the test signals are sequentially input to the speakers other than the
tweeter from the other output terminals, and the transmission time from each speaker to the
listening point is measured. Also, the transmission time from the tweeter 11L, 11R to the
listening point is determined in another way. For example, the transmission time from the second
speakers 12L, 12R of the front L / R channel provided in the vicinity of the tweeter to the
listening point is adopted as the transmission time from the tweeter 11L, 11R to the listening
point. Thereafter, the delay time of the audio signal input to each speaker is determined and
input to the DSP 24 so that the sound from each speaker simultaneously reaches the listening
point.
[0013]
The DSP 24 as an audio processor has a divider function, and divides the front L channel signal
and the front R channel signal into a high frequency side audio signal component and a low
frequency side audio signal component and outputs them. The DSP 24 subjects each audio signal
to delay processing corresponding to the delay time determined by the microcomputer 21 and
outputs it. The selector 25 determines and sends out an output terminal so as to input a test
signal input from the microcomputer 21 to a speaker instructed from the microcomputer at the
time of Auto TCR control. In addition, the selector 25 normally determines an output terminal so
as to input each audio signal input from the DSP to a predetermined speaker and sends it.
[0014]
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FIG. 2 is a processing flow of Auto TCR control of the present invention. When the user issues an
Auto TCR request by key operation (step 100), the microcomputer 21 displays a question
message as to whether the tweeter is used on the display device 23 (step 101), and waits for an
answer from the user for the question. (Step 102). If there is no response from the user, for
example, if there is no response for the set time or more, the processing is terminated as if there
was no Auto TCR request. On the other hand, if there is an answer from the user, it is checked
whether the answer is "use tweeter" (step 103). If the answer is "do not use tweeter", the
transmission time for all channels is The measurement is performed (step 104). That is, the
microcomputer 21 sequentially outputs a test signal for a predetermined time from the output
terminals F1L, F1R, F2L, F2R, C, SW, RL, RR, and all the speakers 11L, 11R, 12L, 12R, 13, 14,
15L. , 15R to the listening point measure the transmission time.
[0015]
Thereafter, the microcomputer 21 obtains the maximum transmission time among the measured
transmission times, and calculates the difference between the transmission time from each
speaker to the listening point and the maximum transmission time as the delay time of the audio
signal input to each speaker, The calculated delay times are set in the DSP 24 (step 105). As a
result, the DSP 24 delays the audio signal input to each speaker for the set time during normal
audio output. On the other hand, if the answer from the user is "use tweeter" in step 103, the
microcomputer 21 outputs the output terminals F2L, F2R, C, SW, RL, other than the output
terminals F1L, F1R to which the tweeter is connected. A test signal is output sequentially from RR
for a predetermined time, and the transmission time from the speakers 12L, 12R, 13, 14, 15L,
and 15R to the listening point is measured (step 106).
[0016]
After that, the microcomputer 21 obtains the maximum transmission time among the measured
transmission times, and the difference between the transmission time from each of the speakers
12L, 12R, 13, 14, 15L, and 15R to the listening point and the maximum transmission time is The
delay time of the input audio signal is calculated, and each calculated delay time is set in the DSP
24 (step 107). Further, the microcomputer 21 determines that the delay time of the audio signal
input to the tweeters 11L and 11R connected to the output terminals F1L and F1R is equal to the
delay time of the audio signal input to the front L / R channel speakers 12L and 12R. The delay
time is set in the DSP 24 (step 108). As described above, the DSP 24 delays the audio signal input
to each speaker for the set time, at the time of normal audio output. Although the case where it
applied to a vehicle-mounted audio apparatus was demonstrated above, this invention is
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applicable not only to a vehicle-mounted but to a general audio system.
[0017]
As described above, according to the present invention, when there is a request to execute the
Auto TCR, the user is asked whether the tweeter is connected or not, and if the user does not
answer the question, the transmission time measurement is not performed, and the question is
asked. Since the transmission time measurement is performed based on the response, the user
can confirm the presence or absence of the tweeter connection and measure the transmission
time, thereby preventing damage to the tweeter.
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