JPS58155377A - Position detector - Google Patents

Abstract

PURPOSE:To adjust sound volume, stereo balance or the like of audio equipment or the like to match the position of listeners detecting the position by receiving and computing light signals and acoustic signals on the side of the audio equipment as transmitted from the position of the listener. CONSTITUTION:From a transmitter 1 of a listener, a light signal and an acoustic signal, for example, each modulated by 38kHz are transmitted at a point A. The light and acoustic signals are received with a photoelectric conversion transducer 10 and sound-electricity conversion transducers 11 and 12 on the side of the receiver and inputted into a arrival time difference detector 15 after modulated waves are removed with demodulators 13, 13' and 14. Then, necessary time lag pulses (e) and (e') are obtained from the circuit 15. The time lag pulses (e) and (e') of these two kinds of light and sound are inputted separately into an arithmetic circuit 22 to compute distances SR and SL. The positions on the X axis and the Y axis are computed with the arithmetic circuit 22 and applied to a control motor as X output and Y output to run a control motor only for a required time thereby adjusting a stereo balancer and the sound volume of right and left channels.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting the volume, stereo balance, etc. of acoustic equipment, etc., according to the position of a listener, and more particularly to a device for automatically detecting the position of a listener.

BACKGROUND ART In stereo reproduction by conventional audio equipment, listeners experience the localization of musical instruments and the like, as well as a sense of realism, due to the acoustic signals radiated from a plurality of speakers. In order to obtain this sense of sound localization and presence, conventionally the position of the listener in the sound field is fixed, and the frequency characteristics, volume, etc. of the acoustic signals from multiple speakers are graphically displayed so that the listener's position in the sound field is heard in the best condition. I have adjusted it with an equalizer, stereo balancer, etc. This has resulted in listeners being glued to this fixed position for long periods of time when trying to listen to good sound. Therefore, for example, by setting multiple listening positions (several locations) for music, etc., and storing the amount of adjustment of the graphic equalizer for these multiple positions in advance, when the listener changes from one of the multiple positions to the other, the graphic equalizer A device was devised to switch the equalizer.

The drawback was that each time you changed the position, you had to manually switch the graphic equalizer to the value you had adjusted yourself.

This invention was made to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a device that automatically detects the position of a listener even if the listener moves arbitrarily.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 9. In FIG. 1, 1 is a transmitter, and as shown in FIG. 2, the transmitter is an electro-acoustic device consisting of an oscillation circuit 2, a modulator 6, 3', an electro-optical conversion transducer 4 consisting of an LED, and a speaker. Conversion transducer 5
Consists of. This transmitter 1 is integrated so that it can be remotely controlled as shown in FIG.

In addition, 10 and 11.12 shown in FIG. 1 are devices on the receiver side, 10 is an optical-to-electric conversion transducer that converts the received light into electricity, and 11 and 12 are the units that convert the received sound into electricity. It is an acoustic-to-electrical conversion transducer. The transducers 11 and 12 are arranged at equal intervals from the center point 0 (zero coordinate) of a straight line connecting the speakers SP1 and SF3 of the performance device (referred to as the X axis).

Further, the optical-to-electrical conversion transducer 1o is arranged near the center point 0.

FIG. 4 shows the equipment on the receiver side, where the outputs of the acoustic-electrical transducers 11 and 12 are 13 and 16.
' is input to the arrival time difference detection circuit 15 via the demodulator. FIG. 6 shows the circuit configuration of the above-mentioned arrival time difference detection circuit 15, in which 16, 17, and 18 are D flip-flops (hereinafter referred to as DFF), 19 is a monomulti, and 2
0.21 is "L".

It is an AND gate with rLJ and rHJ K. FIG. 7 shows a circuit connected to the output side of the above-mentioned arrival time difference detection circuit 15, 22 is a microcomputer circuit having multiple counters and arithmetic functions, and a preset input terminal 23 has a specific interval coefficient, that is, a predetermined optical-electrical Conversion transducer 10
Manually record the position information (equivalent to x and y) when setting up.

24 and 25 are control motors, and the control motors operate for a required time based on the output from the microcomputer circuit 22, that is, the X output and Y output, which are position information. 26 is an adjustment means for the stereo device; The stereo balancer 27 is controlled by the control motor 24,
Volume volumes 28 and 29 are controlled by a control motor 25.

Next, the operation will be explained. To detect the position of point A (a position arbitrarily determined by the listener) shown in FIG. 1, a transmitter 1 held by the listener emits an optical signal and an acoustic signal modulated at 38 KH2 from point A. When this signal waveform is shown in FIG. 8, (f) is an optical signal, and (b) is an acoustic signal. As shown in FIG. 4, these optical signals and acoustic signals are received by an optical-to-electrical conversion transducer 10 and an acoustic-to-electrical conversion transducer 11. The modulated wave is removed and input to the arrival time difference detection device 15. The arrival time difference detection device 1
In No. 5, a light pulse is first input to the DFF 17, and a little later a sound pulse is input to the DFFs 16 and 18, respectively. FIG. 9 shows a time chart for each point a, b, c, d, and e. When a light pulse is input to the DFF 17, the calculation power is held at rLJ.

Further, the sound pulse is also input to the DFF 16 with a delay of tR time compared to the above-mentioned optical input pulse. Therefore, the Q output is also held from rLJ to rHJ with a delay of tR time from the calculated output of the DFF 17. Therefore, since the rLJ input is applied to both input terminals of the AND gate for a time tR, a pulse is formed for a time tR as shown in FIG. 9e at the output of the AND gate. In the above explanation, DFF16
Time difference pulse by phase comparison of DFF17 and DFF17
However, the same explanation can be applied to the phase comparison between the DFF18 and the DFF17. The above arrival time difference detection circuit 1
When the necessary time difference pulses e and e' are obtained from 5, DFFs 16 and 17 are activated by the reset output of the monomulti 19.
．． 18 should be returned to its original state. In this case, when the code signal necessary for transmitting information with a remote control etc. requires 10m5, the monomulti 190 hours is greater than the time plus at least the expected time difference between light and sound, which is 100m5 in this example. And so.

The two types of time difference pulses e and e' between light and sound thus detected are respectively input to an arithmetic circuit 22 shown in FIG. The arithmetic circuit calculates the water distance SR and circles shown in FIG. 1 based on the time difference pulses e and e'. This calculation formula is based on the time difference tR between the signals that first reach the optical-to-electrical conversion transducer 10 and the acoustic-to-electrical conversion transducer 12, and the optical-to-electrical conversion transducer 10.
Similarly, find the time difference tL of the other acoustic-electric conversion transducer 11, tRXK-8RtLXK=SL (s4om in K)
SR and SL can be found as follows. Therefore, the position of the listener becomes. For example, when 5L=SR, the listener is on the Y axis at X-0, and the volume balance of the left and right speakers SP1゜SF3 can be made equal (mono signal); The volume to be determined may be determined to be the same for the left and right channels.

In this way, the arithmetic circuit 22 calculates the positions on the X-axis and Y-axis and applies them to the control motors 24 and 25 as X output and Y output as shown in FIG. In this way, the control motors 24 and 25 are rotated for a required period of time to adjust the stereo balancer 27 and the volume levels 28 and 29 of the left and right channels.

In the above embodiment, the optical-to-electrical conversion transducer 10 is placed near the zero coordinate (0) of the t-X axis, but since the speed of light is much faster than the speed of sound, it can be Since the distance to the source is not a big problem, it can be installed at any position, and it can also be received indirectly using a reflector or the like. Furthermore, the modulators 3 and 4 shown in FIG. 2 of the above embodiment have the same modulation frequency 3.
8KH2 was used, but the modulation frequency may be different between modulators 3 and 3'.Furthermore, all acoustic transducers may be added to the control box of the light control device, and the above optical remote control (38KH2 modulation) can be used. At the same time, 38KH2 ultrasonic waves may be transmitted instead of the sound signal.

In addition, the monomulti 1 used in Figure 6 of the above implementation
The 90 input is taken from the original side, but it can also be taken from the volume. Furthermore, although the control motors 24 and 25 are used as the control means in FIG. 7 shown in the above-mentioned implementation, they can also be output as a code signal or voltage. Further, the positions of the acoustic-electric conversion transducers 11 and 12 shown in FIG. 1 can be arbitrarily selected, such as arranging them on the X axis or at the intersection of the X and Y axes, for ease of calculation.

By the way, as an application example of the above-mentioned embodiment, in a device to be controlled such as an external equalizer, the adjustment amount is memorized for each listener's position as shown in FIGS. 10 (a) and (b).
The output can select the closest location in the memory and adjust it. Moreover, the above-mentioned X and Y outputs may be memory outputs. Furthermore, as another example of application, the device of the present invention is not limited to playback, but can also be effectively implemented in recording. That is, during recording, the microphone can automatically follow the direction of the operator using the X and Y outputs. As another example of application, the X and Y outputs may be output from a memory, and if there is an external device for storing the X and Y values, the memory may not be necessary. Furthermore, when using an audio signal in the audible band, while the mono multi 19 is operating with an optical signal, connect it to the mute circuit of the output audio device so that no sound is emitted from the speaker, etc., and turn off the speaker, or use the remote control. It is best to combine it with an optical signal that operates when the device is muted, such as a stop (5TOP) signal. Furthermore, automatic tracking of television cameras is also possible.

Since the present invention is configured as described above, the oscillation circuit 2 is movable as desired and transmits an optical signal. a first means consisting of a modulator 6, an electro-optical conversion transducer 4, etc.; moving in integral conjunction with the first means;
and an oscillation circuit that transmits a sound signal.2. WJ2 means such as a modulator 3' and an electro-acoustic conversion transducer 5, and third means such as an optical-to-electrical conversion transducer 10 for receiving the optical signal at a predetermined position; a fourth sound means for receiving a sound signal at a predetermined position, a fifth means such as an arrival time difference detection circuit 15 for detecting a difference in arrival time between the light and sound signals, and an input of the fifth means; It is equipped with computing means such as a microcomputer circuit 22 that stores and calculates and outputs data, and simultaneously transmits light and sound signals from the listener's position by the first and second means to the third and fourth means. Since the position of the listener is detected by detecting the total time difference between the received signals using the fifth means and performing further calculations, the listener's position is detected. The position can be automatically detected even if you move arbitrarily.

[Brief explanation of drawings]

Figures 1 to 9 show an embodiment of the present invention. Figure 1 is a layout diagram of the device, Figure 2 is a block diagram of the transmitter side, and Figure 6 is a plan view of the transmitter. 4 is a block diagram of the receiver side, FIG. 6 is a block diagram of the arrival time difference detection circuit 15, FIG. 7 is a block diagram showing an example of use of this device, and FIG. 8 is a block diagram of the receiver side.
The figure is a waveform diagram showing the waveforms of Figure 2, Figure 9 is a diagram showing the time chart of Figure 6, and Figures 10 (A), (
B) is a diagram showing another embodiment. Patent applicant: Akai Electric Co., Ltd. Figure 7 2. Ax face 1' Figure 10 (6) (b) Procedural amendment (method) % formula % 1. Indication of the case 1982 Patent Application No. 038563 2. Name of the invention Position detection device 3. Person making the amendment Case and Relationship Patent applicant CL Address: 2-12-14-4 Higashikojiya, Ota-ku, Tokyo
, Agent (1) “Figures 1 to 9” on page 4, line 9 of the specification
The statement has been corrected to ``Figures 1 to 8''. (2) In the 10th line of page 5 of the specification, "Figure 6" is corrected to "Figure 5." (3) In the specification, on page 5, line 14, the phrase ``Figure 7'' is corrected to ``Figure 1 Figure 6''. (4) In the 12th line of page 6 of the specification, "Figure 8" is corrected to "Figure 7." (5) In the first line of page 7 of the specification, the phrase “Figure 9” has been replaced with “
Figure 8” is corrected. (6) In the specification, page 7, line 9, replace the phrase “Figure 9” with “
Figure 8” is corrected. (7) In the specification, page 8, line 6, replace “Fig. 7” with “
Figure 6” is corrected. (8) In the specification, page 9, line 3, replace “Figure 7” with “
Figure 6” is corrected. (9) In the second line of page 10 of the specification, [Figure 6 j is corrected to read ``Figure 5.'' α0 From line 4 of page 10 of the specification to line 5 of the same page, "Figure 7" is corrected to "Figure 6." (11) In the 10th page, line 12 of the specification, the words ``Figure 10 (a). (b)'' are corrected to [Figure 9 (a), (b)''. α2 Page 12, line 14 to page 13, line 2 of the specification are amended as follows. "Figures 1 to 8 show one embodiment of the present invention. Figure 1 is a layout diagram of this device, Figure 2 is a block diagram of the transmitter side, and Figure 3 is a top view of the transmitter. 4 is a block diagram of the receiver side, FIG. 5 is a block diagram of the arrival time difference detection circuit 15, FIG. 6 is a block diagram showing an example of the use of wooden
The figure is a waveform diagram showing the waveform of FIG. 2, FIG. 8 is a diagram showing the time chart of FIG. 5, and FIGS. 9 (a) and (b) are diagrams showing other embodiments. . 2: Oscillation circuit, 3, 3/: Modulator, 4: Electrical-optical conversion transducer, 5: Electrical-acoustic conversion transducer, 10: Optical-electrical conversion transducer, 11
．． 12: Acoustic-electric conversion transducer, 15: Arrival time difference detection circuit, 22: Microcomputer circuit. ” αj Change “Figure 6” to “Figure 5”, “Figure 7” to “Figure 6”, “Figure 8” to “Figure 7”, “Figure 9” in the drawing
is corrected to "Fig. 8" and "Fig. 10" to "Fig. 9."that's all

Claims (1)

[Scope of Claims] (1) A first means that is arbitrarily movable and transmits an optical signal; and a first means that moves integrally with the first means;
and a second means for transmitting the sound signal, and a third means for receiving the optical signal at a predetermined position, provided at a plurality of locations,
and a fourth means for receiving the sound signal at a predetermined position, a fifth means for detecting the arrival time difference between the light and sound signals, and an arithmetic circuit for storing, calculating and outputting inputs of the fifth means. , the light and sound signals are simultaneously transmitted from the listener's position by the first and second means and received by the third and fourth means, and the difference in arrival time of each received signal is calculated. A position detecting device characterized in that the position of the listener is detected by the fifth means and further calculation. (2) The position detection device according to claim 1, wherein the fifth means detects a delay in the output of the acoustic-electrical transducer with respect to the output of the optical-electrical transducer. (3) The position detection device according to claim 1, wherein the second means outputs an ultrasonic wave as a signal. (4) The position detecting device according to claim 1, wherein the signals of the first and second means are modulated by modulated waves. (5) The position detecting device according to claim 1, wherein the means for @memory 5 receives the signal by using a reflector plate in its entirety. (6) The signals of the first means and the second means are modulated at different modulation frequencies.
The position detection device described in Section 4 or No. 4. (Force) The human power signal of the monomulti 19 used in the fifth means is obtained from a sound signal.
The position detection device according to item 1 or 2. (8) The position detection device according to claim 1, wherein the fourth means is arranged at a position where the X-axis crosses the X-axis and the Y-axis to facilitate calculation.