JPH01309500A - Acoustic control equipment - Google Patents

Abstract

PURPOSE:To adjust the balance of sound, fadar and a phase difference sent from each speaker best at the listening position by sending a nondirectional signal from a transmission means at the listening position, receiving it by plural reception means and detecting the distance between the listening position and each speaker. CONSTITUTION:When the listener listening in a car body 10 operates a remote controller 5 being a transmission means, a nondirectional ultrasonic wave signal is sent and received by ultrasonic wave sensors 3a, 3b, 3c, 3d placed at positions l1, l2, l3, l4 from the remote controller 6 respectively and arranged near the plural speakers 4a, 4b, 4c, 4d provided at prescribed positions. The received signal is sent to a detector 1 via reception lines sl1, sl2, sl3, sl4 and the time difference of each signal received by the ultrasonic wave sensors 3a, 3b, 3c, 3d is calculated and the result is sent to a sound volume phase difference adjusting device 2 via the signal line sl5. The adjustment device 2 processes the increase/decrease in the sound volume and delay corresponding to each time difference.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides an acoustic signal transmitted from an acoustic device through a plurality of speakers provided at predetermined positions, so that the best listening condition fυ is obtained at an arbitrary listening position. The acoustic side (related to the ear device) that is controlled so that

1] Traditional technology In conventional audio equipment, such as a mixer player or tuner, the volume played from the left and right speakers can be adjusted by adjusting the balance volume installed in the amplifier. By adjusting the fader volume, the volume played from the front and rear speakers can be adjusted.

Further, adjustment of the phase difference (hereinafter referred to as "phase difference") during listening of propagated acoustic signals from each speaker, which is caused by the difference in distance from the listening position to each speaker, has not been conventionally performed.

Problems to be Solved by the Invention Conventionally, balance adjustment has been carried out by the listener actually listening to the reproduced sound sent out from each speaker and adjusting the balance volume based on the auditory sense. I'm going. For example, adjusting the balance while driving a car is dangerous because it distracts the driver from paying attention to the road ahead.

In addition, 1. Since no adjustment has been made to the phase difference in the prior art, there is a problem in that an optimal sound field cannot be reproduced at any listening position.

An object of the present invention has been made to solve the above-mentioned problems, and is to adjust the volume and phase difference of the acoustic signals reproduced from each speaker so as to be optimal at the listening position by a simple operation. It is an object of the present invention to provide an acoustic control device that can perform the following functions.

Means for Solving the Problems The present invention provides: a movable transmitting means for transmitting omnidirectional signals from a listening position; a plurality of receiving means for receiving signals transmitted from the transmitting means; and the receiving means. An acoustic device characterized by comprising: means for calculating the position of the transmitting means in response to the output of the calculating means; and means for changing and adjusting the acoustic signal to be reproduced by each speaker in response to the output from the calculating means. It is a control device.

Operation According to the third aspect of the present invention, a plurality of receiving means receive the omnidirectional signal by transmitting the omnidirectional signal from the listening position using the transmitting means. At that time, the position of the transmitting means is calculated based on the signal received by the receiving means, and the acoustic signal to be reproduced by each speaker is changed and adjusted.

Embodiment FIG. 1 is a configuration diagram of an acoustic control device which is an embodiment of the present invention. When a remote control 5 consisting of a transmitting means, such as an ultrasonic transmitter, is operated by a listener (in this embodiment, the driver) listening inside the vehicle body 10, omnidirectional ultrasonic waves are emitted. Ultrasonic detection sensors 3 are placed near each of the plurality of speakers 4a, 4b, 4c, and 4d, and are located at distances of 11, 12, and 13 degrees 14 from the remote controller 5, to which signals are sent. t, 3b.

Received by 3c and 3d. The received signal is transmitted through the receiving line s11. sN2. sl 3. sl 4 to the detection device 1, within which the respective ultrasonic detection sensors 3a, 31:+.

3c and 3d, the time difference between the received signals is calculated.

The calculated time difference is transmitted to the volume via the signal line sf5.
The signal is sent to the phase difference adjustment device 2.

In the volume/phase difference adjustment device 2, the playback device 6fs responds to the audio signal input from a compact disc player, tuner, etc. via the signal line sN6.
Volume increase/decrease and delay processing corresponding to each time difference is performed, and each output signal line sf 7. sZ 8. sN
9. Through Sl 10, each speaker 4a, 4b,
4c, regenerated from 4c amount. The sound reproduced according to the above is adjusted so that the balance and phase difference between the left and right speakers and the front and rear speakers are optimal at the listening position where the remote control 5 is operated.

FIG. 2 is a block diagram of the configuration of the transmitting means.

When the operation switch 51 of the remote control 5, which is the transmitting means, is operated, the oscillation drive circuit 52 in the oscillation circuit 50 is driven,
An oscillation start signal is given to the oscillator 53 via the control signal line 5150, and the oscillator 53 sends out ultrasonic waves or the like.

FIG. 3 is a configuration block diagram for explaining the volume and phase difference adjustment operations in the first (2I) volume and phase difference adjustment device 2. From etc.
The acoustic signals are on signal lines sl 6a, se 6b.

sN 6c, sj! The signal is input to the volume/phase difference adjustment device 2 via 6d. Within the volume phase difference adjustment device 2, the acoustic signal is converted to an analog/digital converter (hereinafter referred to as r
"A/D converter". ) 21 into digital signals, and the signal lines dN1a, df 1 b, dj!
1c and dlld to the variable delay circuit 22.

Further, delay control signals, which will be described later, are transmitted from the detection device 1 to the signal lines sN 52a, sZ 52b, sl! 52c,
5I52d to the variable delay circuit 22.

The delay control signal is sent to each speaker 4a.

This is a signal for controlling the amount of delay to cause a phase difference in each acoustic signal reproduced from 4b, 4c, and 4d. The number of signal transfer elements of the digital delay elements 22a, 22t+, 22c, and 22d in the variable delay circuit 22 is varied by the delay control signal. The digital delay elements 22a, 22
Each acoustic signal sent/sent to b, 22c, and 22d is
The closer the speaker is to the remote control 5, the more delayed the reproduction is, and the phase difference is controlled to be zero at the listening position.

When the ultrasonic signal is first received by each ultrasonic detection sensor 3a, 31:l, 3c, 3d, the delay control signal is transmitted through the receiving line sN1. sβ
2゜Sri3. It is sent to the detection device 1 via sl4.

FIG. 4 shows each ultrasonic detection sensor 3a, 3 in FIG.
FIG. 3 is a waveform diagram for explaining the reception times of ultrasonic waves received by the ultrasonic waves b, 3c, and 3d, and the time difference calculated by the detection device 1. FIG. FIG. 4 (1) shows the waveform of the ultrasonic wave output from the remote control 5, and FIG. 4 (2) shows the waveform of the ultrasonic wave detected by the ultrasonic detection sensor 3.
Fig. 4 (3) shows the received waveform of the ultrasonic wave received by a.
4 shows the received waveform of the ultrasonic wave received by the ultrasonic detection sensor 3b, FIG. 4 (4>) shows the received waveform of the ultrasonic wave received by the ultrasonic detection sensor 3C, and FIG. The received waveform of the ultrasonic wave received by the detection sensor 3d is shown.
Figures (2) to (5) show that each ultrasonic detection sensor 3a, 3b, 3
c, 3d, the reception time T, , Tb, Te, respectively.
, Td, indicating that the ultrasound is received. The reception time is T.

Tb, Tc, T are distances t from the remote control 5! 1. N2
Since the value corresponds to ゜β3,14, the reception time Ta
, T, ,T, ,Td, each ultrasonic detection sensor 3a, 31:l, 3C, 3d and remote controller 5
It detects each distance difference.

Detection device] is each ultrasonic detection sensor 3a, 3b.

3c, 3d Reception time T8゜T of ultrasonic waves received by
b, Te, and Td, the ultrasonic detection sensor located farthest from the remote controller 5 (hereinafter referred to as the "remote ultrasonic detection sensor") is determined, and the speaker located near the farthest lunar sound detection sensor is determined. Hereinafter, this will be referred to as the "farthest speaker." ) to determine. In the case of the present embodiment shown in FIG. Receiving time T4 of ultrasonic detection sensor 3d and other ultrasonic detection sensors 3a, 3b, 3c=
7-.

The reception times Ta, T, ,T, and the time difference between them T, ,T.

, calculate TdC. The time difference Td, Td, T
de follows the relationships of the first to third equations. The time difference T, 8
A signal corresponding to ゜T d b + T d c is used as a delay control signal on the signal line sl! 52a, sf 52
b,sl! It is sent out to the variable delay circuit 22/\ via 52c. Further, a signal whose time difference corresponds to O is transmitted to the signal line sN 52d, and sent to the variable delay circuit 22.

T,,=T,-T,-(1,)Tdb=
T, -T, (2) Tdc=T, -Tc
(3) The variable delay circuit 22 is provided with digital delay elements 22a, 22b, 22c, and 22d into which acoustic signals are input/output for phase difference adjustment.

The digital delay elements 22a, 221), 22C, 22d
In response to the delay control signal sent from the detection device 1, the closer the speaker is to the remote controller 5, the later the phase of the acoustic signal is played, and the phase difference between the nine signals of each sound is 0 at the listening position. The number of signal transfer elements is varied so that it becomes =8-. The acoustic signals sent out from the variable delay circuit 22 are transmitted through signal lines d12a and dl.
2b, d12c, and dN 2d, the acoustic signal is sent to a digital/analog converter (hereinafter referred to as "D/'A converter") 23, where it is analog-converted, and further signal lines d13a, dN 3b.

The signal is sent to the volume adjustment circuit 24 via dβ3c and di3d.

The volume adjustment circuit 24 also receives a volume control signal, which will be described later, from the detection device] to signal lines 5N54a and sf5.
4b, 5154c, and sl 54d.

The volume control signal is applied to each volume adjustment circuit 2, !, in order to create a volume difference in each acoustic signal reproduced from each speaker 4a, 4b, 4c, 4d. 1 a.

24b, 24c, and 24d are signals for varying the amplification gain of the acoustic signal. The amplitude of each acoustic signal is varied by the volume control signal (-), and the farther the speaker is from the remote control 5, the louder the volume of the reproduced acoustic signal becomes, so that the same volume level is achieved at the listening position. controlled by.

=10= The procedure for sending out the volume control signal is as follows: First, the detection device 1 sends each ultrasonic detection sensor 3 =t, 3b, 3c,
3 d reception time T, ,T, ,T,
. Speaker (hereinafter referred to as "nearest speaker").

) to determine. In the case of ``No. 11'', the ultrasonic detection sensor 3a becomes the nearest ultrasonic detection sensor, and therefore the speaker 4a becomes the nearest speaker. After that, the detection device 1 detects the reception time T2 of the nearest ultrasonic detection sensor 3a.
and other ultrasonic detection sensors 31J, 3c, and 3d]゛5゜T, , time difference between I and J) T, , T, ,
, Td. The time difference Tb. ,T,a,T,,
follows the relationships of Equations 4 to 6. The time difference T,...T
. , , Td, or as a volume control signal, signal lines sl 54b, sN 54c, sff 54d.
Volume adjustment circuit 24b, 24. c,
24 d/＼Large input.

Further, a signal corresponding to the time difference or 0 is transmitted to the signal line 5N54a and sent to the volume adjustment circuit 2Il, =t'\\.

Tba-Tb-Ta - (4) "T",
, =T, -Ta -(5)Td, =T, -T
a −<6) Each volume adjustment circuit 24. a
, 241), 24. c and 24d are controlled by the volume control signal to the amplification gain of each acoustic signal, so that the acoustic signal sent out from the D/A converter 23 is based on the volume reproduced from the nearest speaker 4a. As,
Other speakers 41:+.

The volume level reproduced from 4c and 4d is adjusted so that it can be heard at approximately the same volume level at the listening position. The sound signal No. 2 sent out from the sound adjustment circuit 24 is connected to the signal line dN4. a, dN-] b, d
The power is sent out to the amplifier 251\ via N4c and dp4d, and the power is amplified, and then to the output line sN7. s! ! 8
゜s＆9. Each speaker 4a, 4b via sl 10
.

It is played from 4c and 4d.

As described above, the sound reproduced from the speaker 4 is adjusted to the listening position -11=(by only the operation of the remote control 5), and the balance inside the car and the volume and phase difference of the fader are adjusted. In this way, it is not necessary to adjust the balance using a preset balance volume and then adjust the fader using a fader volume.

FIG. 5 is a flow chart for explaining the volume adjustment operation in the first step (21). First, when ultrasonic waves are transmitted by the remote control 5'), in step S],
The detection device] detects each ultrasonic wave detection unit 3εL, 3b, 3c,
Receiving time T, , Tb, Tc of ultrasound received at 3cl
, T, the nearest ultrasonic detection sensor 3a from the remote controller 5 is determined, the nearest speaker 4a at the listening position is determined, and the process proceeds to step s21\. In step S2, the detection device 1 determines the time difference Tb between the reception time T8 of the nearest ultrasonic detection sensor 3a and the reception time T, Tc, T, etc. of the other ultrasonic detection sensors 31:+, 3c, 3d. T...
.

Measure Tda and proceed to step S3 /\. Step S
3, and based on the volume reproduced from the nearest speaker 4εt, from the speakers 4b, 4c, and 4d in the pond, there are time differences T corresponding to each distance difference to the listening position.
T, a, T1. At the listening position, each speaker 4ε+, , , 11:+ is reproduced by emphasizing the volume that is expected to attenuate during the period.

Volume adjustment is performed so that the volume levels of the audio signals reproduced from 4c and 4d are of the same level.

FIG. 6 is a flowchart 1 for explaining the phase difference adjustment operation in FIG. 1. First, when an ultrasonic wave is transmitted by the remote controller 5, in step m1, the detection device 1 detects each ultrasonic wave detection sensor 3a, 3b, 3c, 3d.
The reception time of the ultrasound waves received at T, ,T,1. Tc,
Remoteest ultrasonic detection sensor 3d from Td to remote control 5
, the farthest speaker 4d at the listening position is determined, and the process proceeds to step rn2. In step m2, the time difference T between the reception time T of the detection device 1 or the nearest ultrasonic detection sensor 3cl and the reception time T, , Tb, T, of the ultrasonic detection sensors 3a, 3b, 3c of the pond. as,
Tdb.

Measure Td, and proceed to step m3'\. In step r113, each speaker 4a, 4b
, 4 c , 4 d to have a phase difference between the other speakers 4 a, 4 b, Each time difference T, , a corresponds to each distance difference between the acoustic signal reproduced from 4c and the listening position.
, T II blT d C, and advance. In the stage m4, each speaker 4a, 4b, 4c, 4cl
Digital delay elements 22a, 22b, 2 that have a phase difference by sending the acoustic signal to be sent out/・'
The number of signal transfer elements 2c and 22d is varied in accordance with each delay amount. Each variable digital delay element 22
a, 22b, 22c, and 22d to send/send acoustic signals, and each corresponding speaker 4a, 4b
, 4 c: , =] By reproducing from d, phase difference adjustment is performed such that the phase difference of each acoustic signal at the listening position becomes O.

FIG. 7 is a conceptual diagram illustrating balance and fader movement before and after volume control.

FIG. 7(1) shows the movement of the balance before and after the volume control, and FIG. 7(2) shows the movement of the fader before and after the volume control. Before the balance is adjusted, even if the balance volume is set at the center position Bc, the driver feels that the balance exists at the left-side position Bt. When the balance volume is adjusted and the balance is moved to the rightward position B, the driver feels as if he or she is at the center position Bc of the balance.

Furthermore, before the fader is adjusted, even if the fader volume is set to the center position FC, the driver feels that the fader is located at the rear position Ft. Ru. When the fader volume is adjusted and the fader is moved to the front position F, the driver feels as if he or she is at the center position F of the fader.
It is experienced as if it were present at c.

As described above, in this embodiment, four reception detection elements are provided in order to determine the listening position, but after the signal is sent from the transmission means, the reception time at each reception detection element is Since any listening position can be determined by using the time difference, the listening position can be determined if at least three reception detection elements are provided.

Effects of the Invention According to the present invention, the distance between the listening position and each speaker can be detected by operating the - degree transmitting means while the listener is at any listening position in the car. The balance of the sound sent out from each speaker and the fader and phase difference can be adjusted to be optimal at the listening position.

[Brief explanation of the drawing]

1 is a block diagram of a sound control device which is an embodiment of the present invention, FIG. 2 is a block diagram of a transmitting means, and 3I21 is the volume and sound image adjustment in the volume and phase difference adjustment device 2 of FIG. A configuration block diagram for explaining the operation, FIG. 4 shows each ultrasonic detection sensor 3a, 3b, 3c in FIG.
, 5th waveform diagram for explaining the reception time of the ultrasonic waves received by 3d and the time difference calculated by the detection device 1.
The figure is a flowchart for explaining the operation of volume adjustment in Figure 1. +-i Figure 6 is a flowchart for explaining the operation of phase difference adjustment in Figure 1. FIG. 3 is a conceptual diagram for explaining balance and fader movement according to the third embodiment. 1 detection device, 2 volume phase difference adjustment device, 3a, 3b
, 3c, 3cl Ultrasonic detection sensor, 4a. 41:+, 4c, 4d- speaker, 5 remote control, 6.
Reproducing device, 22・Variable delay circuit, 22a, 22b, 22
c, 22d Digital delay element, 24 volume adjustment circuit Agent Patent attorney Keibu Saikyo Figure 5 Figure M6

Claims (1)

[Scope of Claims] A movable transmitting means for transmitting omnidirectional signals from a listening position; a plurality of receiving means for receiving signals transmitted from the transmitting means; and a plurality of receiving means responsive to the output of the receiving means. An acoustic control device comprising: means for calculating the position of the transmitting means; and means for changing and adjusting an acoustic signal to be reproduced by each speaker in response to an output from the calculating means.