JPH0738986A - Acoustic signal reproduction system - Google Patents

Abstract

PURPOSE:To correct an acoustic characteristic simply in a short time when a listening point or a speaker installation position is revised or an acoustic characteristic of an acoustic signal reproduction space is revised. CONSTITUTION:An impulse sound generating means 18 generates an impulse sound for each speaker and the impulse sound is propagated in an acoustic signal reproduction space and measured by an impulse sound measurement means 13, an impulse sound time difference detection means 14 detects a time difference of an impulse sound arrival time from each speaker to a remote controller 11 and an impulse sound pressure difference detection means 15 detects a difference from the sound pressure for each speaker unit at the listening point. The detection result is sent to an acoustic signal reproduction device 16, and a 1st acoustic signal correction means 19 and a 2nd acoustic signal correction means 20 based thereon correct the acoustic signal sent from a reproduction acoustic signal source 22 and sends the reproduction signal to an acoustic signal reproduction means 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker provided in an acoustic signal reproducing device, when an acoustic signal listener moves in the acoustic signal reproducing space to change a listening point, or in an acoustic signal reproducing space. The present invention relates to an acoustic signal reproduction system that can easily correct the acoustic characteristic at a listening point after the change when the installation position changes or when the acoustic characteristic of the acoustic signal reproduction space changes.

[0002]

2. Description of the Related Art Conventionally, as a method for correcting the acoustic signal characteristics in an acoustic signal reproducing system, a first method is to previously provide a storage device in the acoustic signal reproducing apparatus, and the storage apparatus is provided with several kinds of correcting acoustic characteristics. There is a method in which the characteristics of the reproduced sound are corrected by recording one and selecting one from the correction acoustic characteristics when reproducing the acoustic signal.

As a second method, the acoustic signal characteristic at the listening point in the acoustic signal reproducing space is measured, and an acoustic characteristic correcting means is inserted between the signal source and the amplifier in the acoustic signal reproducing apparatus, and the measurement result is obtained. There is a method of correcting the acoustic characteristics with reference to.

[0004]

However, since the distance between the listening point and the plurality of speakers provided in the acoustic signal reproducing device is not equal, the wavefront of the reproduced acoustic signal from each speaker is deviated at the listening point. If the acoustic characteristics between each speaker and the listening point are different due to the difference in sound absorption coefficient around the installation location of each speaker, a difference in sound pressure of the reproduced acoustic signal from each speaker occurs. There were issues such as this.

Further, in the above-mentioned first method, since the acoustic characteristics of the acoustic signal reproducing spaces are different from each other or the acoustic characteristics of the speaker units are different from each other, the correction is performed by the first method. However, the desired correction characteristics may not be obtained. In the second method, since the operation for changing the acoustic signal correction characteristic is complicated, the correction characteristic should be changed in a short time when the listener changes the listening position in the acoustic signal reproduction space. However, there is a problem in that the desired acoustic characteristics may not be obtained with the correction characteristics that have been set previously.

The present invention solves such a problem, and in the acoustic signal reproducing system, when the installation position of the acoustic signal reproducing device and the position of the listener change, or the acoustic characteristic of the acoustic signal reproducing space changes. In this case, it is possible to easily change the correction characteristics of the reproduced sound in a short time and to change the correction characteristics for each positional relationship and each sound reproduction space. It is intended.

[0007]

In order to solve the above-mentioned problems, an audio signal reproducing system of the present invention comprises an audio signal reproducing device and a remote control device for remotely operating the audio signal reproducing device. In the signal reproduction system,
The remote control device has acoustic signal measuring means, and the acoustic signal reproducing device is configured to have acoustic signal transmitting means, at least two speakers, and acoustic signal characteristic correcting means. The means propagates the acoustic signal transmitted by the acoustic signal transmitting means into the acoustic space by the speaker, measures the propagated acoustic signal by the acoustic signal measuring means, and based on the measurement result, It is characterized in that the wave fronts of the acoustic signals emitted from the speakers are aligned at the listening point, and the sound pressures of the acoustic signals emitted from the speakers are corrected to be equal at the listening point.

The acoustic signal characteristic correcting means is provided with a number equal to the number of the speakers, and is provided with a delay device for delaying the reproduced acoustic signal source and a difference in arrival time of the acoustic signals from the respective speakers measured by the acoustic signal measuring means. Delay time setting means for setting the delay time of the delay device, an amplifier for amplifying the output signal of the delay device, and amplification of the amplifier by the sound pressure difference between the acoustic signals from the speakers measured by the acoustic signal measuring means. And an amplification factor setting means for setting the factor.

[0009]

With the above structure, the present invention measures the acoustic signals from a plurality of speakers provided in the acoustic signal reproducing device at the position of the acoustic signal listener having the remote control device, and outputs each acoustic signal from each speaker. By obtaining the difference in signal arrival time and the difference in sound pressure between each acoustic signal, each channel from each speaker at the listening point corresponds to the acoustic characteristics of each acoustic signal reproduction space or each listening position or each speaker unit. It is possible to perform correction so that there is no deviation in the wavefront of the reproduced acoustic signal of, and the sound pressure of the reproduced acoustic signal of each channel from each speaker becomes equal.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an audio signal reproducing system of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an audio signal reproducing system according to the first embodiment.

Reference numeral 11 denotes a remote control device, which comprises an impulse sound transmission command transmitting means 12, an impulse sound measuring means 13, an impulse sound time difference detecting means 14 and an impulse sound pressure difference detecting means 15. Reference numeral 16 denotes an acoustic signal reproducing device, which is an impulse sound transmitting command receiving means 17, an impulse sound generating means 18, a first acoustic characteristic correcting means 19, a second acoustic characteristic correcting means 20, an acoustic signal reproducing means 21, and a reproduced acoustic signal. It is composed of a source 22 and at least two speakers (not shown).

First acoustic signal correcting means 19 or second
The acoustic signal correction means 20 are provided in the acoustic signal reproducing device 16 in the same number as the speakers provided in the acoustic signal reproducing device 16. In this embodiment, two speakers are provided, and therefore two acoustic signal correction means are provided.

First, the impulse sound transmission command transmission means 12 provided in the remote control device 11 transmits the impulse sound transmission command to the acoustic signal reproducing device 16. The transmission command is received by the impulse sound transmission command receiving means 17 provided in the acoustic signal reproducing device 16 and transmitted to the impulse sound generating means 18. After that, the impulse sound generating means 18 emits an impulse sound for each speaker included in the acoustic signal reproducing device 16. The impulse sound emitted from each of these speakers propagates in the acoustic signal reproduction space and is measured by the impulse sound measuring means 13. Based on the measured impulse sound, the impulse sound time difference detection means 14 causes the remote control device 1 to operate from the speakers.
The time difference of arrival times of the impulse sounds up to 1 is detected.
Further, the impulse sound pressure difference detecting means 15 detects the difference in the sound pressure value of each speaker unit at the listening point based on the measured impulse sound. The detection result of the time difference and the detection result of the sound pressure difference are transmitted from the remote control device 11 to the acoustic signal reproducing device 16 by the detecting means, and the first acoustic signal correcting means 19 and the second acoustic signal correcting means 20 are transmitted. Will be received at.

After that, the first acoustic signal correcting means 19 and the second acoustic signal correcting means 20 correct the acoustic signal emitted from the reproduced acoustic signal source 22, and the acoustic signal reproducing means 2
The reproduction signal is transmitted to 1.

In the measurement of the impulse sound, the order of the channels for transmitting the impulse sound is predetermined, and the time interval of the impulse sound transmission is sufficiently longer than the reverberation time of the acoustic signal reproduction space. This makes it possible to determine from which channel the impulse sound measured by the impulse sound measuring means 13 is an impulse sound.

FIG. 2 is an internal block diagram of the first acoustic characteristic correcting means 19 or the second acoustic characteristic correcting means 20 shown in FIG.

Reference numeral 24 is a delay device, which reproduces the acoustic signal source 22.
The signal input from is delayed by the time set by the delay time setting means 25. Reference numeral 26 denotes an amplifier, which is a delay device 2
The reproduced sound signal delayed by 4 is amplified by the amplification factor set by the amplification factor setting means 27. Here, the delay time setting means 25 determines the delay time based on the time difference detected by the impulse sound time difference detecting means 14. As a result, the acoustic signals of the two channels output from the reproduction acoustic signal source 22 are delayed by the arrival time difference between the acoustic signals of the channels whose arrival time to the listening point is shorter, so that each channel is delayed at the listening point. The wavefronts of the islands will arrive without shifting. In addition, the amplification factor setting means 2
Reference numeral 7 determines the amplification factor based on the sound pressure difference detected by the impulse sound pressure difference detecting means 15. Thereby, the acoustic signals of the two channels output from the reproduction signal source 22 are
At the listening point, the sound pressures of the channels are corrected to be equal.

With such a configuration, it becomes possible to correct the acoustic signal corresponding to each acoustic characteristic of the space in which the acoustic signal is reproduced, and the listener having the remote control device 11 can perform the above-mentioned measurement at the listening point. , The reproduced sound output from the reproduced acoustic signal source 22 has no wavefront shift between channels due to the distance difference between the installation location of each speaker and the listening point, and the acoustic characteristics between each speaker and the listening point. It is possible to listen without any sound pressure difference between the channels due to the difference.

Also, when the listener having the remote control device 11 moves in the acoustic signal reproduction space and the listening point changes, or when the installation location of the acoustic signal reproduction device 16 changes in the acoustic signal reproduction space. And the impulse sound measuring means 1
By measuring the impulse sound using the remote control device 11 provided with 3, and performing correction based on the measurement result,
It is possible to easily correct the acoustic signal characteristics corresponding to the changed listening point and the installation location of the acoustic signal reproducing device 16.

In the present embodiment, the sound propagated in the sound reproduction space is described as an impulse sound, but the sound is not limited to this and may be another sound signal.

[0022]

As described above, according to the present invention, the acoustic signals emitted from the plurality of speakers of the acoustic signal reproducing apparatus are measured by the remote control device having the acoustic signal measuring means, and the acoustic signals from the speakers are measured. By determining the arrival time difference and the sound pressure difference of the acoustic signal, the wave front of the sound reproduced from each speaker does not shift between the channels at the position of the listener with the remote control device, and the sound pressure from each speaker does not change. It is possible to reproduce the audio signal so that there is no difference between the two, and this makes it possible to easily change the correction characteristics of the reproduced sound in a short time, and change the correction characteristics for each positional relationship and each sound reproduction space. It becomes possible to do.

[Brief description of drawings]

FIG. 1 is a block diagram of an audio signal reproduction system according to a first embodiment of the present invention.

FIG. 2 is a block diagram of acoustic signal correction means according to the first embodiment of the present invention.

[Explanation of symbols]

 11 Remote Control Device 12 Impulse Sound Transmission Command Transmission Means 13 Impulse Sound Measurement Means 14 Impulse Sound Time Difference Detection Means 15 Impulse Sound Sound Pressure Difference Detection Means 16 Acoustic Signal Reproducing Means 17 Impulse Sound Transmission Command Receiving Means 18 Impulse Sound Generation Means 19 First Acoustic signal correcting means 20 Second acoustic signal correcting means 21 Acoustic signal reproducing means 22 Reproducing acoustic signal source 23 Acoustic signal characteristic correcting means 24 Delay device 25 Delay time setting means 26 Amplifier 27 Amplification factor setting means

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area H04R 3/12 Z

Claims (2)

[Claims] 1. A sound signal reproducing system comprising a sound signal reproducing device and a remote control device for remotely controlling the sound signal reproducing device, wherein the remote control device has a sound signal measuring means. The signal reproducing device is configured to include an acoustic signal transmitting unit, at least two speakers, and an acoustic signal characteristic correcting unit, and the acoustic signal characteristic correcting unit is the acoustic signal transmitted by the acoustic signal transmitting unit. Is propagated to the acoustic space by the speaker, the propagated acoustic signal is measured by the acoustic signal measuring means, and the wave front of the acoustic signal emitted from each speaker based on the measurement result is aligned at the listening point, An acoustic signal reproducing system is characterized in that the sound pressure of the acoustic signal emitted from each speaker is corrected to be equal at the listening point. 2. The acoustic signal characteristic correcting means is provided with a number equal to the number of the speakers, a delay device for delaying a reproduced acoustic signal source, and arrival of the acoustic signals from each speaker measured by the acoustic signal measuring means. Delay time setting means for setting the delay time of the delay device by a time difference, an amplifier for amplifying the output signal of the delay device, and the amplifier by the sound pressure difference of the acoustic signal from each speaker measured by the acoustic signal measuring means. 2. The audio signal reproduction system according to claim 1, further comprising: an amplification factor setting means for setting the amplification factor of.