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JPH06133390

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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 JPH06133390
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
tone control circuit for an AV apparatus or the like.
[0002]
2. Description of the Related Art As an audio apparatus, for example, a radio cassette player,
there are apparatuses which can perform various adjustments on sound quality such as graphic
equalizer processing, reverberation processing, surround processing, in addition to sound
volume. In addition, there are also cases in which the loudness characteristic is changed when
adjusting the volume. In addition, some listeners have been able to select the realism of a hall,
live house, disco, etc.
[0003]
However, in general, as the distance from the speaker is increased, the direct sound from the
speaker, the reflected sound from the wall, etc., and the crosstalk amount of the reproduced
sound on the left and right, etc. change. Or the feeling of spread is impaired.
[0004]
For this reason, even if the radio cassette player is adjusted to the desired sound quality, when
the listening position is changed, the reproduced sound that is actually heard by the listener
08-05-2019
1
becomes an insufficient or over-adjusted sound.
[0005]
The present invention is intended to solve such problems.
[0006]
[Means for Solving the Problems] Here, considering the case of remote controlling an audio
device, the transmitter of the remote control is normally held by the listener and operated, so
that the transmitter of the remote control and the audio device Is approximately equal to the
distance between the listener and the audio device.
[0007]
The present invention pays attention to such a point, and makes the audio device recognize the
position of the listener, that is, the distance from the audio device to the listener using the
transmitter of the remote control, and the audio device The tone quality of the reproduced sound
is corrected or changed according to the distance.
[0008]
That is, when the reference numerals of the respective parts correspond to the embodiment
described later, when any operation key of the plurality of operation keys 61 is operated, the
infrared light IR of the content corresponding to the operated operation key is output When the
predetermined operation key 61P of the plurality of operation keys 61 is operated, the infrared
light IR of the content corresponding to the operated operation key 61P is output, and the
ultrasonic wave US is also output. A remote control transmitter 60 is used in combination,
according to stereo audio signal systems 10L and 10R, a light receiving element 31 and a
microphone 41 for receiving infrared light IR and ultrasonic waves US, and an output signal SIR
of the light receiving element 31. The circuit 21 for changing the characteristics of the audio
signal system 10L, 10R to the characteristics corresponding to the key operation of the
transmitter 60, and the predetermined operation key 61P are operated to operate the transmitter
When infrared light IR and ultrasound US are output from 0, a circuit 21 for obtaining the
distance to the transmitter 60 based on the time difference between the output signal SIR of the
light receiving element 31 and the output signal SUS of the microphone 41 is obtained.
According to the provided distance, the characteristics of the audio signal systems 10L and 10R
are changed to change the sound quality of the reproduced sound.
[0009]
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2
The distance to the listener is calculated from the time difference between the reception of the
infrared light IR from the transmitter 60 and the ultrasonic wave US, and the characteristics of
the audio signal systems 10L and 10R are corrected or changed according to the calculated
distance. Ru.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In the example shown in FIG. 1, the
reproduced sound is corrected assuming that the listener is at a distance of 1, 2, 3, 4, or 5 m
from the audio device.
[0011]
That is, in FIG. 1, 10 indicates an audio apparatus such as a radio cassette player, and 60
indicates a transmitter for the remote control.
In the audio apparatus 10, 10L and 10R indicate audio signal systems of left and right channels.
Since these signal systems 10L and 10R have the same configuration, the illustration and
description of the right channel signal system 10R will be omitted hereinafter.
[0012]
Furthermore, in the audio apparatus 10, 11 is a built-in audio signal source such as a CD player,
a cassette deck, a broadcast receiving circuit, etc. From this signal source 11, audio signals L and
R of stereo left and right channels are taken out .
Further, reference numeral 14 denotes a DSP mainly for providing a sense of presence, 15
denotes a graphic equalizer circuit, 16 denotes a variable attenuator circuit for volume control,
and 18L and 18R denote speakers of left and right channels.
The details of the circuits 14 to 16 will be described later, but all are integrated into one chip IC.
08-05-2019
3
[0013]
Then, the signal L from the signal source 11 is supplied to the addition circuit 12, and the signals
L and R from the signal source 11 are supplied to the addition circuit 13 to extract an addition
signal (L + R). L + R) is supplied to the DSP 14 to form the presence effect signals ΔL, ΔR, and
the signal ΔL is supplied to the addition circuit 12, and from the addition circuit 12, an audio
signal L12 of the left channel in which the presence is produced Is taken out.
[0014]
Then, the signal L12 is supplied to the graphic equalizer circuit 13, and an audio signal L15 of
the left channel in which the frequency characteristic of the signal L12 is changed is extracted
from the equalizer circuit 13. This signal L15 is transmitted to the variable attenuator circuit 16
and the power. It is supplied to the speaker 18 L of the left channel through the amplifier 17.
[0015]
Further, 21 denotes a microcomputer for system control, 22 denotes operation keys for
performing various operations, 31 denotes a light receiving element for infrared light for remote
control, 32 denotes a receiving circuit thereof, and an output of the key 22 and an output of the
receiving circuit 32 Are supplied to the microcomputer 21 and their control signals are supplied
from the microcomputer 21 to the circuits 14-16.
That is, when the key 32 is operated, the circuit corresponding to the operated key among the
circuits 14 to 16 is controlled by the microcomputer 21 and the characteristic of the audio signal
supplied to the speakers 18L and 18R is the operated key. It is controlled correspondingly.
[0016]
Further, in the transmitter 60 of the remote control, 61 is an operation key for performing
various operations, 62 is a microcomputer for remote control signal encoding, 63 is a circuit for
forming a carrier signal S63 having a frequency of 40 kHz, for example, and 66 is an infrared
LED. .
Then, when an arbitrary one of the keys 61 is pressed at an arbitrary time point t1, the
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4
microcomputer 62 corresponds to the pressed key in a pulse train from the time point t1 to the
time point t2 as shown in FIG. 4A, for example. The pulse PIR of the pulse arrangement to be
output is output.
[0017]
Then, the pulse PIR is supplied to the AND circuit 64, and the carrier signal from the forming
circuit 63 is supplied to the AND circuit 64. The AND circuit 64 supplies the pulse PIR from time
t1 to time t2 as shown in FIG. 4B. Thus, the gated or PAM modulated signal SIR is extracted, and
the signal SIR is supplied to the LED 66 through the output amplifier 65 to be converted into
infrared light IR, and this infrared light IR is transmitted to the audio apparatus 10.
[0018]
Then, in the audio device 10, the infrared light IR from the transmitter 60 is received by the light
receiving element 31, the signal SIR is extracted, and the pulse PIR of the original pulse train is
demodulated even if the signal SIR is supplied to the receiving circuit 32. The pulse PIR is
supplied to the microcomputer 21.
[0019]
Thus, when the key 61 of the transmitter 60 is operated, the circuit corresponding to the
operated key among the circuits 14 to 16 is controlled by the microcomputer 21 and the
characteristics of the audio signal supplied to the speakers 18L and 18R are operated. It is
controlled according to the key that has been
Therefore, in this case, various items can be changed or set by the remote control.
[0020]
And in this invention, in order to make the audio apparatus 10 recognize the listening position of
a listener, it is further comprised as follows.
That is, the transmitter 60 is provided with a key 61P for listening position recognition as a part
of the key 61, and an ultrasonic wave generating element (ultrasonic transducer) 72.
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5
Further, a routine 80 as shown in FIG. 2 is prepared in the microcomputer 62, for example.
[0021]
Further, the audio apparatus 10 is provided with a microphone 41 for receiving the ultrasonic
wave from the ultrasonic wave generation element 72, a band pass amplifier 42, and a detection
circuit 43, and the microcomputer 21 performs a routine 50 as shown in FIG. Is prepared.
[0022]
Then, when the key 61 of the transmitter 60 is pressed, the processing of the microcomputer 62
starts from the routine 81, and next, in step 82, it is checked whether the pressed key 61 is the
key 61P for listening position recognition When the key 61P is not pressed, this is when the key
for normal remote control operation is pressed, so the process proceeds from step 82 to step 89,
and in this step 89, the key pressed is handled as described above. Pulse PIR (FIG. 4A) of the
pulse train to be formed.
Therefore, this pulse PIR is converted to a signal SIR (FIG. 4B), and further, this signal SIR is
converted to infrared light IR by the LED 66, and this infrared light IR is transmitted to the audio
device 10.
[0023]
Further, the processing of the microcomputer 62 proceeds to step 85 following step 89, ends the
routine 80 in this step 85, and thereafter waits for key input again.
[0024]
Then, in the audio device 10, when the infrared light IR from the transmitter 60 is received by
the light receiving element 31 and the pulse PIR is supplied from the receiving circuit 32 to the
microcomputer 21, the processing of the microcomputer 21 starts from step 51 of the routine
50. In the step 52, it is checked whether the pulse PIR supplied from the receiving circuit 52
indicates that the listening position recognition key 61P has been pressed.
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6
Then, when the pulse PIR does not indicate that the key 61 P is pressed, this is when the key for
normal remote control operation is pressed, so the process proceeds from step 52 to step 59,
and in this step 59, The processing corresponding to the key pressed as described above is
executed, and hence the audio apparatus 10 is in an operating state corresponding to the pressed
key (except for the key 61P) of the keys 61.
[0025]
Further, the processing of the microcomputer 21 proceeds to step 58 following step 59, ends the
routine 50 in this step 58, and waits for the next input.
[0026]
On the other hand, if it is determined in step 82 of the routine 80 that the pressed key is the
position recognition key 61P, the process proceeds from step 82 to step 83, and this step 83
indicates that the key 61P has been pressed as a pulse PIR. The pulses of the pulse train, ie, the
pulses PIR (FIG. 4A) of the pulse train which direct the measurement of the distance D between
the listener and the device 10, are formed.
Then, since this pulse PIR is converted into the modulated signal SIR (FIG. 4B) and supplied to the
LED 64, the LED 64 outputs infrared light IR instructing measurement of the distance D between
the listener and the device 10 Infrared light IR is transmitted to the audio device 10.
[0027]
Subsequently, the processing of the microcomputer 62 proceeds to step 84. In this step 84, as
shown in FIG. 4C, a pulse PUS which rises at time t3 and becomes "H" for a predetermined
period, for example, 2 to 3 ms, is formed. The pulse PUS is supplied to the AND circuit 71, and
the carrier signal from the forming circuit 63 is supplied to the AND circuit 71.
Therefore, as shown in FIG. 4D, the signal SUR gated by the pulse PUS is taken out from the time
point t3 to the period PUS = "H" from the AND circuit 71, and this signal SUR is generated
through the output amplifier 72. The element 73 is supplied to be converted into the ultrasonic
wave US, and the ultrasonic wave US is transmitted to the audio device 10.
08-05-2019
7
[0028]
Then, the processing of the microcomputer 62 proceeds from step 84 to step 85 to end this
routine 80, and thereafter waits for key input again.
[0029]
On the other hand, since the infrared light IR and the ultrasonic wave US are sent to the device
10 by the signals SIR and SUS shown in FIGS. 4B and 4D, the light receiving element 31 outputs
the signal SIR and the microphone 41 outputs the signal SUS. Is output.
And, in this case, since the distance D between the transmitter 60 and the device 10 can be
ignored for the infrared light IR, the signal SIR from the light receiving element 31 can be
obtained from the time point t1 as shown in FIG. Thus, the pulse PIR from the receiver circuit 32
can also be obtained from time t1 as shown in FIG. 4A.
[0030]
However, for ultrasound US, since the distance D between the transmitter 60 and the device 10
can not be ignored, the signal SUS from the microphone 41 is between the transmitter 60 and
the device 10 from time t3 as shown in FIG. 4E. It can be obtained at time t4 when the period τ
corresponding to the distance D has elapsed.
[0031]
Then, this signal SUS is supplied to the detection circuit 43 through the band pass amplifier 42,
and as shown in FIG. 4F, it is considered as a signal indicating the envelope of the received signal
SUS, and this envelope signal is shaped as shown in FIG. As shown in FIG. 4G, a signal which rises
at time t4 and is in the "H" period during reception of the signal SUS, that is, the original pulse
PUS is extracted.
Then, this pulse PUS is supplied to the microcomputer 21.
08-05-2019
8
[0032]
The microcomputer 21 executes the routine 50 by supplying the pulse PIR at time t1. In this
case, the pulse PIR supplied from the receiving circuit 52 is used to press the listening position
recognition key 61P. The process proceeds from step 52 to step 53 because it indicates that it
has been done.
[0033]
Then, at step 53, clocking of the timer by software is started from "0", next, at step 54, input of
the pulse PUS from the shaping circuit 43 is awaited, and when the pulse PUS is supplied, at step
55, By stopping the timing of the timer started in step 53 and subsequently using the timed value
of the timer in step 56, the distance between the transmitter 60 and the device 10, ie, the
distance D between the listener and the device 10 Calculated
[0034]
That is, as shown also in FIG. 4, .tau. = T4 -t3 (1), when this equation (1) is modified, .tau. = T4 -t3
-t2 + t2 = (t4 -t2)-( t3-t2) (2)
[0035]
Since time t2 is the time when the timer starts counting time in step 53 and time t4 is the time
when timing of the timer is stopped in step 55, the first term (t4) in equation (2) -T2)
corresponds to the time measured by the timer.
Note that this measured time is taken as a value τ42.
[0036]
Further, in FIG. 4, time t2 is the end time of pulse PIR at transmitter 60, time t3 is the start time
of pulse PUS at transmitter 60, and a period (t3) between these time t2 and t3. -T2) is known and
constant.
Therefore, t3-t2 = τ32
08-05-2019
9
[0037]
Then, from the above, equation (2) becomes τ = (t 4 −t 2) − (t 3 −t 2) = τ 42 −τ 32.
That is, the time τ can be obtained from the time τ42 measured by the timer and the known
constant value τ32.
[0038]
At this time, since the distance D between the listener and the audio device 10 is = sonic velocity
x (τ42−τ32), the distance D is calculated from the time τ42 (and the constant value τ32)
measured by the timer. Can.
[0039]
When the distance D is determined, the processing of the microcomputer 21 proceeds to step 57.
In step 57, the circuits 14 to 16 are controlled in accordance with the distance D determined in
step 56, and the audio signal L is controlled by these circuits 14 to 16. Process (and R) as
described below and then exit the routine 50 by step 58.
[0040]
First, although it is DSP14, this DSP14 is comprised, for example, as shown in FIG.
That is, the addition signal (L + R) is A / D converted into a digital signal by the A / D converter
141, and this signal is supplied to the delay circuit 144 through the variable attenuator circuit
142 and the addition circuit 143.
Then, the output signal of the delay circuit 144 is fed back to the addition circuit 143 through
the first-order FIR low-pass filter 145 and the variable attenuator circuit 146 to form echo and
echo signals.
Then, the tap outputs of the delay circuit 144 are supplied to the addition circuits 147L and
08-05-2019
10
147R through the variable attenuator circuits 441L to 448L and 441R to 448R, and the signals
ΔL and ΔR of the initial reflection sound and the rear reverberation sound corresponding to the
listening position of the listener These signals .DELTA.L and .DELTA.R are supplied to the D / A
converters 149L and 149R through the variable attenuator circuits 148L and 148R and taken
out as effect signals .DELTA.L and .DELTA.R.
[0041]
Then, in this case, the attenuation amounts of the variable attenuator circuits 142, 146, 441L to
448L, 441R to 448R, 148L, 148R and the filter coefficient of the low pass filter 145 are
controlled by the microcomputer 21 and the characteristics of the signals ΔL, ΔR change It is
done.
[0042]
For example, when the listener is at a position 1 m from the audio device 10, a powerful
reproduced sound as if it is close to the stage, and when it is at a position 5 m, it is a reproduced
sound as sitting at the center of the hole.
This also has the meaning of correcting or emphasizing that the sense of stereo weakens when it
is separated from the audio device 10.
For this reason, the DSP 14 is controlled by the microcomputer 21 and the reverberation sound
level and reverberation time are small when the listener is at a position of 1 m and are enlarged
at a position of 5 m. Thus, from the DSP 14, the effect signals ΔL and ΔR of the realism are
extracted.
[0043]
Next, although the variable attenuator circuit 16 is used, for example, when the listener leaves
the apparatus 10 in a state where the setting of the sound volume is small, the sound volume
heard by the listener becomes even smaller and it becomes difficult to hear the sound. Therefore,
the variable attenuator circuit 16 is controlled by the microcomputer 21 to perform general
volume adjustment and correct the level of the signal L15 in accordance with the distance D
between the device 10 and the listener.
08-05-2019
11
[0044]
The correction of this level utilizes that the sound pressure of the speaker 18L decreases by 3 dB
in proportion to the distance D of the listener. That is, for example, when the distance D between
the device 10 and the listener is 1 m, the attenuation amount S [dB] of the sound pressure at the
distance D [m] is S = 3 · log (D / 1) / It can be determined by log 2 and when D = 1 m, S = 0.0 dBD
= 2 m, S = 3.0 dB D = 3 m, S = 4.8 dB D = 4 m, S = 6.0 dB D = 5 m, S = 7.0 dB
[0045]
Therefore, the attenuation amount of the attenuator circuit 16 is changed according to the
distance D to the listener so as to compensate for the level reduction of the reproduced sound
due to the distance D. That is, a value obtained by subtracting the above value S from the
attenuation amount before correction of the attenuator circuit 16 is set in the attenuator circuit
16 again.
[0046]
Further, the graphic equalizer circuit 15 has a center frequency of level control of, for example,
frequencies of 100 Hz, 500 Hz, 1 kHz, 4 kHz, and 8 kHz, and the level at these frequencies is
controlled by the microcomputer 21. Then, in addition to actively changing the frequency
characteristic of the original audio signal L12 to enjoy audio reproduction, the equalizer circuit
15 also performs correction of the auditory frequency characteristic that changes depending on
the volume. The latter correction is similar in concept to general loudness correction, but an
element of the distance D of the listener is further added to the correction.
[0047]
That is, as described above, since the level of the signal L15 is corrected in the attenuator circuit
16 according to the distance D between the apparatus 10 and the listener, the volume of the
reproduced sound heard by the listener is the reference distance ( The volume is the same as
when listening at D = 1m.
08-05-2019
12
[0048]
However, when the microcomputer 21 corrects the level of the signal L15 in the attenuator
circuit 16, the loudness correction characteristic of the graphic equalizer circuit 16 changes in
conjunction with this correction (if it does not change, the volume is changed without changing
the listening position). When changed, loudness correction will not be performed).
[0049]
Therefore, for the signal component having a frequency of 1 kHz, the volume is corrected to be
constant due to the change of the attenuator circuit 16 described above, but the loudness
correction characteristic is not flat. Changes in the volume will change.
[0050]
As an example, the solid and broken lines in FIG. 6A show equal loudness characteristics with 70
dB and 90 dB sound pressure.
Then, although the playback volume of the equal loudness characteristic of 70 dB in FIG. 6A is
now, since the listener has left the apparatus 10, the attenuation amount of the attenuator circuit
16 so that the volume of the playback sound actually heard by the listener does not change. Is
controlled by the microcomputer 21 and the level of the signal L15 supplied to the speaker 18L
is increased by 20 dB (= 90 dB-70 dB).
[0051]
Then, at this time, the loudness correction characteristic of the equalizer circuit 16 changes in
conjunction, and the changed loudness correction characteristic becomes a 90 dB characteristic
that is 20 dB larger than the 70 dB characteristic.
Then, the level of the signal L15 is increased so that the volume of the frequency 1 kHz becomes
equal, so when the characteristics of 70 dB and the characteristics of 90 dB are superimposed
with reference to the frequency 1 kHz, as shown in FIG. 6B Although both characteristics
coincide at a frequency of 1 kHz, the characteristics of 90 dB fall below the characteristics of 70
dB except for the high region.
08-05-2019
13
Therefore, as shown also in FIG. 6C, the correction amount of the loudness correction is
insufficient except for the high region.
[0052]
That is, when the attenuator circuit 16 corrects the signal level according to the position of the
listener, at this time, the loudness correction characteristic of the equalizer circuit 16 changes in
conjunction, so the shortage or excess of the loudness correction characteristic due to this
change is It needs to be corrected.
[0053]
In practice, since there is a limit to the characteristic of the graphic equalizer circuit 15 or the
number of center frequencies of level control, the peak and valley frequencies of the equal
loudness characteristic are taken as the center frequency of level control of the equalizer circuit
15.
In addition, low frequency characteristics of the speaker 18L and the like are also considered.
Then, as described above, the center frequency of level control of the equalizer circuit 15 is set to
the frequencies of 100 Hz, 500 Hz, 1 kHz, 4 kHz, and 8 kHz as described above.
[0054]
As described above, according to the present invention, when the key 61 P of the transmitter 60
of the remote control is pressed, the infrared light IR and the ultrasonic wave US are outputted
from the transmitter 60 and these infrared light IR and the ultrasonic wave US Are received by
the audio apparatus 10 to determine the distance D between the listener and the audio apparatus
10. According to the distance D, the sound quality of the audio signals L and R supplied to the
speakers 18L and 18R is controlled.
[0055]
Therefore, even if the listener changes the listening position, it is possible to always listen to the
reproduced sound with the optimum sound quality or always with the favorite sound quality of
the listener by simply pressing the key 61P of the transmitter 60.
08-05-2019
14
In addition, even in the case where reproduction sound with high clarity is always required, the
requirement can be satisfied.
[0056]
In the above, data necessary for controlling the audio signal in the circuits 14 to 16 may be
prepared in the microcomputer 21 or may be obtained by calculation. In the above description,
the transmitter 60 is provided with the dedicated key 61P for recognizing the position of the
listener. However, when a part of the operation keys 61 is pressed, the audio device 10 originally
corresponds to the key The sound quality can be changed by performing the same processing as
when the key 61P is pressed.
[0057]
Further, the infrared light IR and the ultrasonic wave US similar to the infrared light IR and the
ultrasonic wave US when the key 61P is pressed may be automatically output from the
transmitter 60 at a constant cycle. Further, as the key 61P, a key corresponding to the distance D
of 1, 2,..., 5 m is provided, and the audio device 10 can recognize the distance D by selectively
pressing this key according to the distance D You may Furthermore, the circuits 66, 64, 71 can
be included in the microcomputer 62.
[0058]
According to the present invention, when the key 61P of the remote control transmitter 60 is
pressed, the audio device 10 recognizes the distance D between the listener and the audio device
10, and the audio signal supplied to the speakers 18L and 18R according to the distance D The
sound quality of L and R is controlled.
[0059]
Therefore, even if the listener changes the listening position, it is possible to always listen to the
reproduced sound with the optimum sound quality or always with the favorite sound quality of
the listener by simply pressing the key 61P of the transmitter 60.
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15
In addition, even in the case where reproduction sound with high clarity is always required, the
requirement can be satisfied.
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16
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