JP2005027113A - Acoustic controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an optimal acoustic field effect of a multi-channel surround acoustic system by detecting range difference between each loudspeaker and a listener and adjusting phase delay and a gain of an amplifier output circuit which drives each speaker based on the detected range difference. <P>SOLUTION: Acoustic waves with a prescribed frequency are transmitted from a remote controller by every prescribed period, the acoustic waves transmitted from the remote controller are received by a plurality of loudspeakers connected with an acoustic controller, acoustic waves with large amplitude among the acoustic waves received by the plurality of loudspeakers are detected, respectively, whether or not each of the detected acoustic waves are with the prescribed frequency of the prescribed period is discriminated, the range difference to the plurality of loudspeakers is calculated based on difference in arrival time of each of the detected acoustic waves and the gain and the phase delay of the amplifier output circuit which drives the plurality of loudspeakers are adjusted, respectively, based on the calculated range difference. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic control apparatus for controlling a multi-channel surround sound system, and more particularly to an acoustic control apparatus having a function for automatically setting the sound field effect of the multi-channel surround sound system.
[0002]
2. Description of the Related Art In general, in order to set the sound field effect of a multi-channel surround sound system such as a Dolby 5.1ch surround system, the distance from each speaker to a listener while checking the contents of a manual etc. Accordingly, there is a problem in that the volume level and phase delay of the acoustic signal output to each speaker must be adjusted. In particular, when the listening room is large, it is not easy to optimally set the sound field effect of the multi-channel surround sound system.
As a conventional technique, each speaker receives radio waves from the remote control, transmits radio waves to the remote control device, measures the round-trip time of the radio waves by the remote control device, and viewers from each speaker based on the measurement results. And the center speaker or the right and left speakers are moved back and forth according to the distance difference (see, for example, Patent Document 1).
In addition, an omnidirectional ultrasonic signal is transmitted from the remote control device at the listening position, and the transmitted ultrasonic signal is received by an ultrasonic sensor provided in each speaker, up to the transmission position of the ultrasonic signal. There is a technique in which the acoustic signal to be reproduced by each speaker is changed and adjusted according to the calculated distance (see, for example, Patent Document 2).
When a predetermined operation key of the remote control device is operated, infrared light corresponding to the operated operation key is output and ultrasonic waves are output, and a time difference between the output signal of the light receiving element and the output signal of the microphone is output. The distance from the remote control device is calculated based on the above to change the characteristics of the audio signal system (for example, see Patent Document 3).
[0006]
[Patent Document 1] JP-A-6-233377 [Patent Document 2] JP-A-1-309500 [Patent Document 3] JP-A-6-133390
However, in the first one described in the prior art, radio waves from the remote control are received by each speaker, radio waves are transmitted to the remote control device, and the radio waves are transmitted by the remote control device. The round trip time was measured, the distance from each speaker to the viewer was calculated based on the measurement result, and the center speaker or the right and left speakers could be moved back and forth according to the distance difference. There is a problem in that a transmitter for transmitting and a receiver for receiving radio waves are provided in the remote control device, and a receiver for receiving radio waves and a transmitter for transmitting radio waves must be provided in each speaker.
In the following, an omnidirectional ultrasonic signal is transmitted from the remote control device at the listening position, and the transmitted ultrasonic signal is received by an ultrasonic sensor provided in each speaker. The distance to the transmission position of the sound wave signal can be calculated, and the acoustic signal to be reproduced by each speaker can be changed and adjusted according to the calculated distance, but it is an ultrasonic signal transmitted from the remote control device. Therefore, when another ultrasonic signal is received by the ultrasonic sensor, the distance to the transmission position of the ultrasonic signal is erroneously calculated.
Further, in the following, when a predetermined operation key of the remote control device is operated, an infrared light corresponding to the operated operation key is output and an ultrasonic wave is output, and an output of the light receiving element is output. The distance from the remote control device can be calculated based on the time difference between the signal and the output signal of the microphone, and the characteristics of the audio signal system can be changed. As described above, this is an ultrasonic signal transmitted from the remote control device. Therefore, when another ultrasonic signal is received by the ultrasonic sensor, the distance to the transmission position of the ultrasonic signal is erroneously calculated.
The present invention has been made in view of such problems of the prior art, and the object of the present invention is to detect the distance difference between each speaker and the listener, and to detect the detected distance difference. It is intended to provide an acoustic control device that can adjust the phase delay and gain of an amplification output circuit that drives each speaker based on the above, and obtain an optimum sound field effect of a multi-channel surround sound system Is.
[0011]
In order to achieve the above object, according to the present invention, there is provided an acoustic control apparatus for controlling the sound field effect of a multi-channel surround sound system, wherein a signal having a predetermined frequency is provided for each predetermined period. An oscillation means for oscillating; a transmission means for amplifying a signal oscillated by the oscillation means and transmitting the signal as a sound wave; a plurality of reception means for receiving a sound wave transmitted from the transmission means; A plurality of detection means for detecting each of the sound waves having a large amplitude among the sound waves received by the reception means; and a determination means for determining whether or not the sound waves respectively detected by the plurality of detection means are predetermined sound waves. The sound waves respectively detected by the plurality of detection means when the determination means determines that the sound waves respectively detected by the plurality of detection means are predetermined sound waves. Calculation means for calculating distance differences to the plurality of reception means based on the arrival time difference, and control means for adjusting gains and phase delays of the plurality of amplification output circuits based on the distance differences calculated by the calculation means, respectively. With.
The discriminating means discriminates whether or not the sound waves detected by the plurality of detecting means are sound waves having a predetermined frequency with a predetermined period.
The transmission means may be a speaker provided in the remote control device.
The plurality of receiving means may be a plurality of speakers connected to an acoustic control device.
By these means, a distance difference between each speaker and a listener is detected, and a phase delay and a gain of an amplification output circuit for driving each speaker are adjusted based on the detected distance difference, so that multi-channel surround is provided. It is possible to obtain an optimum sound field effect of the acoustic system.
[0016]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail below with reference to the drawings as appropriate. FIG. 1 is a block diagram illustrating a configuration of an acoustic control device according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram illustrating an arrangement of each speaker of the acoustic control device according to the embodiment of the present invention. 3 is a block diagram showing a remote control device of the acoustic control device according to the embodiment of the present invention, and FIG. 4 is an explanatory diagram showing sound waves received by each speaker of the acoustic control device according to the embodiment of the present invention. FIG. 5 is an explanatory diagram showing transmitted and received sound waves of the acoustic control device according to the embodiment of the present invention, and FIG. 6 is a flowchart showing the operation of the acoustic control device according to the embodiment of the present invention.
First, description will be made based on the block diagram showing the configuration of the acoustic control apparatus according to the embodiment of the present invention shown in FIG.
The acoustic control device 10 delays the phase of the acoustic signal, amplifies the acoustic signal by varying the gain, and the sound wave received by the right front speaker R and the amplification output circuit 11 that drives the right front speaker R. Detecting circuit 12 that detects the sound signal, phase-delaying the acoustic signal, amplifying the acoustic signal by varying the gain, and detecting the sound wave received by the center speaker C and the amplification output circuit 13 that drives the center speaker C The detection circuit 14, the acoustic signal is delayed in phase, the gain is varied to amplify the acoustic signal, the amplification output circuit 15 that drives the subwoofer SW, the acoustic signal is phase-delayed, the gain is varied, and the acoustic signal is Amplification output circuit 16 that amplifies and drives left front speaker L, detection circuit 17 that detects sound waves received by left front speaker L, and phase delay of the acoustic signal And amplifying the sound signal by varying the gain to drive the left surround speaker SL; a detection circuit 19 for detecting the sound wave received by the left surround speaker SL; and delaying the sound signal in phase. The amplification output circuit 20 that drives the right surround speaker SR by amplifying the acoustic signal with variable gain, the detection circuit 21 that detects the sound wave received by the right surround speaker SR, and the entire system of the acoustic control device 10 And a microcomputer 22 for controlling the above. Reference numeral 30 denotes a remote control device.
As shown in FIG. 2, each speaker connected to the sound control device 10 is disposed in the listening room B. The center speaker C is disposed in the front center of the listener A, and the left front speaker. L and the right front speaker R are disposed on the left and right of the center speaker C, the subwoofer SW is disposed on the side of the center speaker C, and the left surround speaker SL and the right surround speaker SR are disposed on the left and right of the listener A. Yes.
As shown in FIG. 3, the remote control device 30 includes a key operation unit 31 provided with a plurality of operation keys for instructing the operation of the acoustic control device 10, and a microcomputer 32 for controlling the system of the remote control device 30. A drive circuit 33 that drives an infrared LED (light emitting diode) 34 to transmit a remote control signal of an infrared signal, an oscillation circuit 35 that oscillates a signal of a predetermined frequency, and amplifies the signal oscillated by the oscillation circuit 35 And an amplification output circuit 36 that transmits a sound wave by driving the speaker 37.
The operation of the acoustic control apparatus constructed as described above will be described below.
When the listener selects the automatic sound field setting on the menu screen displayed on the monitor device (not shown) and operates a predetermined operation key of the key operation unit 31 of the remote control device 30, the remote control device 30 is selected. The microcomputer 32 sends a control signal to the oscillation circuit 35 to transmit a signal having a predetermined frequency at a predetermined period T. The amplified output circuit 36 amplifies the signal, and the speaker 37 is driven. A sound wave having a predetermined frequency is transmitted every period T (see FIG. 5A). The period T is set to be sufficiently longer than the time for the sound wave to reach the speaker located farthest from the listener so that it is not affected by the sound wave reflected by the ceiling, wall, etc. of the listening room. It has become.
The amplitude directly received from the speaker 37 of the remote control device 30 by any one of the center speaker C, the left front speaker L, the right front speaker R, the left surround speaker SL, and the right surround speaker SR connected to the acoustic control device 10. When a large direct wave sound wave, a small amplitude indirect wave sound wave reflected by the ceiling, wall, etc. of the listening room B is received (see FIGS. 4 and 5), based on the amplitude level of the received sound wave, A direct wave sound wave having a large amplitude in the received sound wave is detected by the detection circuits 12, 14, 17, 19, and 21, and a direct wave sound wave signal having a large amplitude detected is sent to the microcomputer 22. The The microcomputer 22 discriminates whether or not the direct-wave sound wave having a large amplitude detected by the detection circuits 12, 14, 17, 19, and 21 is a sound wave having a predetermined frequency with a predetermined period T, and detecting each of them. When the generated direct-wave sound wave having a large amplitude is a sound wave of a predetermined frequency with a predetermined period T, any one of the center speaker C, the left front speaker L, the right front speaker R, the left surround speaker SL, and the right surround speaker SR With reference to the direct wave having a large amplitude first received every predetermined period, the arrival time difference t1, t2, t3, t4 of the direct wave having a large amplitude received by another speaker every predetermined period thereafter Is measured (see FIGS. 5B to 5F), and distance differences v × t1, v × t2, v × t3, and v × t4 of each speaker are calculated. v is the speed of sound. For example, when the center speaker C is arranged closest to the listener A, and the left front speaker L, the right front speaker R, the left surround speaker SL, and the right surround speaker SR are arranged close to the listener A in this order, the center speaker C And the distance between the left front speaker L, the right front speaker R, the left surround speaker SL, and the right surround speaker SR are L2−L1 = v × t1, L3−L1 = v × t2, L4−L1 = v × t3, and L5. -L1 = v * t4 is calculated (see FIGS. 2 and 5).
When there is a distance difference to each speaker, the microcomputer 22 determines the gain and phase delay of each amplification output circuit 11, 13, 16, 18, 20 based on the calculated distance difference to each speaker. Adjust. Since the subwoofer SW is installed beside the center speaker C, the amplification output circuit 15 that drives the subwoofer SW is adjusted according to the adjustment of the gain and phase delay of the amplification output circuit 13 that drives the center speaker C. The Thereby, when there is a distance difference from each speaker to the listener A, the sound field effect of the multi-channel surround sound system can be optimally adjusted.
The operation of the acoustic control apparatus according to the embodiment of the present invention shown in FIG. 6 will be described below.
When a sound wave transmitted from the remote control device is received by any of a plurality of speakers connected to the acoustic control device, the process proceeds from step S1 to step S2, and in step S2, the received sound wave is transmitted at a predetermined cycle. If the received sound wave is a sound wave having a predetermined cycle, the process proceeds to step S3. If the received sound wave is not a sound wave having a predetermined period, the process proceeds to step S7 to perform the process. finish.
In step S3, it is determined whether or not the received sound wave is a sound wave having a predetermined frequency. If the received sound wave is a sound wave having a predetermined frequency, the process proceeds to step S4, and the received sound wave is detected. If the sound wave does not have a predetermined frequency, the process proceeds to step S7 and the process ends.
In step S4, the arrival time difference between the sound waves having a large amplitude among the sound waves respectively received by the respective speakers at predetermined intervals is measured, the distance difference to each speaker is calculated, and the process proceeds to step S5.
In step S5, it is determined whether there is a difference in distance to each speaker. If there is a difference in distance to each speaker, the process proceeds to step S6. If there is no difference in distance to each speaker, the process proceeds to step S7. Proceed and finish the process.
In step S6, the gain and phase delay of the amplification output circuit for driving each speaker are adjusted based on the calculated distance differences, and the process proceeds to step S7 to end the process.
Although the embodiment of the present invention has been described in detail above, the present invention is not limited to this, and modifications and improvements can be made within the ordinary knowledge of those skilled in the art. For example, it has been explained that a sound wave is transmitted from a remote control device, a difference in arrival time of the sound wave to each speaker is measured, and a distance difference to each speaker is calculated. A receiving unit for receiving or a light receiving unit for receiving infrared light is provided in each speaker, and an ultrasonic signal, radio wave signal or infrared signal transmitted from the remote control device is received, and an ultrasonic signal or radio signal to each speaker is received. Alternatively, the arrival time difference of each infrared signal may be measured and the distance difference to each speaker may be calculated.
[0032]
As described above, according to the acoustic control device of the present invention, a sound wave having a predetermined frequency is transmitted from the remote control device every predetermined period, and the sound wave transmitted from the remote control device is transmitted to the acoustic control device. Are detected by a plurality of speakers connected to each other, and each of the sound waves having a large amplitude among the sound waves received by the plurality of speakers is detected. When the detected sound wave is a sound wave of a predetermined frequency of a predetermined period, a direct wave with a large amplitude first received every predetermined period by any of a plurality of speakers is used as a reference. Then, the arrival time difference of the direct wave with a large amplitude received by another speaker every predetermined period is measured, the distance difference to each speaker is calculated, and the calculated distance is calculated. The amplifier output circuit for driving a plurality of loudspeakers gain and phase delay and the can be adjusted respectively based on the difference. This detects the distance difference between each speaker and the listener, adjusts the phase delay and gain of the amplification output circuit that drives each speaker based on the detected distance difference, and optimizes the multi-channel surround sound system It is possible to obtain a sound field effect.
According to a first aspect of the present invention, an acoustic control device transmits a sound wave having a predetermined frequency from a remote control device every predetermined period, and a plurality of sound waves transmitted from the remote control device are connected to the acoustic control device. Receiving with a speaker, detecting each sound wave having a large amplitude among sound waves received by a plurality of speakers, and determining whether each detected sound wave is a sound wave of a predetermined frequency of a predetermined period When each detected sound wave is a sound wave of a predetermined frequency with a predetermined period, the distance difference to the plurality of speakers is calculated based on the arrival time difference of each detected sound wave, and based on the calculated distance difference The gain and phase delay of the amplification output circuit that drives multiple speakers are adjusted individually, so that each speaker can be received by receiving other sound waves with different periods and frequencies. The distance difference can be prevented from being detected by mistake, and the indirect wave with a small amplitude and the direct wave with a large amplitude due to the ceiling, walls, etc. of the listening room are discriminated. A distance difference can be prevented from being detected by mistake.
According to a second aspect of the present invention, the acoustic control apparatus transmits a sound wave having a predetermined frequency every predetermined period, receives each transmitted sound wave, and has a large amplitude in the received sound wave. Each sound wave is detected, it is determined whether each detected sound wave is a predetermined sound wave, and when each detected sound wave is a predetermined sound wave, the distance based on the arrival time difference of each detected sound wave Since the difference is calculated and the gain and phase delay of each of the multiple amplification output circuits are adjusted based on the calculated distance difference, other sound waves having different periods and frequencies, the ceiling of the listening room, the walls, etc. By receiving an indirect acoustic wave with a small amplitude, the distance difference to each speaker can be prevented from being erroneously detected.
According to the third aspect of the present invention, the acoustic control apparatus determines whether or not the received sound wave is a sound wave of a predetermined frequency with a predetermined period. Thus, it is possible to prevent erroneous detection of a difference in distance to each speaker.
Since the acoustic control apparatus according to the fourth aspect of the invention transmits the sound wave by the speaker provided in the remote control device, it can transmit the non-directional sound wave.
In the acoustic control device according to the fifth aspect of the invention, since the sound waves are received by the plurality of speakers connected to the acoustic control device, other receiving elements such as microphones are provided on the plurality of speakers. There is no need.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an acoustic control apparatus according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing an arrangement of each speaker of the acoustic control device according to the embodiment of the present invention.
FIG. 3 is a block diagram showing a remote control device of the acoustic control device according to the embodiment of the present invention.
FIG. 4 is an explanatory diagram showing sound waves received by each speaker of the acoustic control device according to the embodiment of the present invention.
FIG. 5 is an explanatory diagram showing transmitted / received sound waves of the acoustic control device according to the embodiment of the present invention.
FIG. 6 is a flowchart showing an operation of the acoustic control apparatus according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Acoustic control apparatus 11, 13, 15, 16, 18, 20 Amplification output circuit 12, 14, 17, 19, 21 Detection circuit 22 Microcomputer 30 Remote control device 31 Key operation part 32 Microcomputer 33 Drive circuit 34 Infrared LED
35 Oscillation circuit 36 Amplification output circuit 37 Speaker C Center speaker L Left front speaker R Right front speaker SW Subwoofer SL Left surround speaker SR Right surround speaker A Listener B Listening room

Claims (5)

An acoustic control device for controlling the sound field effect of a multi-channel surround sound system,
From an oscillating means for oscillating a signal of a predetermined frequency every predetermined period, a speaker provided in a remote control device for amplifying the signal oscillated by the oscillating means and transmitting the signal as a sound wave, and the remote control device A plurality of speakers connected to an acoustic control device that receives the transmitted sound waves; a plurality of detection means for detecting sound waves having a large amplitude among the sound waves received by the plurality of speakers; and the plurality of detection means Determining means for determining whether or not the sound waves detected by each of the plurality of sound waves are sound waves of a predetermined frequency of a predetermined period, and the sound waves respectively detected by the plurality of detecting means by the determining means for a predetermined period of a predetermined period When it is determined that the sound wave has a frequency, the difference in distance to the plurality of speakers based on the arrival time difference between the sound waves respectively detected by the plurality of detection means An acoustic device comprising: calculating means for calculating; and control means for adjusting the gains and phase delays of the amplification output circuits for driving the plurality of speakers based on the distance difference calculated by the calculating means. Control device. An acoustic control device for controlling the sound field effect of a multi-channel surround sound system,
An oscillating means for oscillating a signal having a predetermined frequency every predetermined period, a transmitting means for amplifying the signal oscillated by the oscillating means and transmitting the signal as a sound wave, and a sound wave transmitted from the transmitting means A plurality of receiving means for receiving; a plurality of detecting means for detecting a sound wave having a large amplitude among the sound waves received by the plurality of receiving means; and a sound wave detected by each of the plurality of detecting means is a predetermined sound wave. And a discriminating unit for discriminating whether or not each of the sound waves detected by the plurality of detecting units is a predetermined sound wave. A computing means for computing distance differences to the plurality of receiving means based on the arrival time differences; and gains of the plurality of amplification output circuits based on the distance differences computed by the computing means; Sound control apparatus characterized by comprising a control means for adjusting the phase delay and respectively. The acoustic control according to claim 2, wherein the determination unit is a determination unit that determines whether or not the sound wave detected by each of the plurality of detection units is a sound wave having a predetermined frequency in a predetermined cycle. apparatus. The acoustic control device according to claim 2, wherein the transmission unit is a speaker provided in a remote control device. The acoustic control apparatus according to claim 2, wherein the plurality of receiving units are a plurality of speakers connected to the acoustic control apparatus.

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