JPH04261300A - Stereo acoustic equipment - Google Patents

Abstract

PURPOSE:To realize the stereo acoustic equipment in which a sound image distribution uniform horizontally appears in front of the listener independently of the position of the listener using a remote control transmitter or the like for the operation. CONSTITUTION:A difference in the arrival time and a difference of a sound volume of a sound wave delivered to sound wave sensors 3L, 3R provided to left/right speakers from a remote control transmitter 2 are detected by a detection circuit 5, a control circuit 8 controls delay circuits 6L, 6R and balance control circuits 7L, 7R to provide a delay and a sound volume difference to cancel the above time arrival difference and the sound volume difference to the left and right stereo signals thereby preventing the sound image distribution from being biased to any of the left/right speakers.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereo audio system that can adjust the sound image distribution so that it is not biased toward either the left or right speakers depending on the position of a listener who has a remote control transmitter or the like.

0002

2. Description of the Related Art An example of the prior art is shown in FIG. In the figure, 13L and 13R are left and right speakers that output audio signals as sound waves, 14 is the main body of the stereo audio device,
The control unit for the amplifier, etc. is housed inside.

As shown in FIG.
When operating with a remote control transmitter (hereinafter referred to as a remote control transmitter) at the center of 3R, a sound image 16 equally distributed on the left and right appears in front of the listener 15, but as shown in FIG. When the user 15 is biased toward the right speaker 13R, each of the left and right speakers 13L
, 13R, and the sound image 16 is closer to the right speaker 13R than the listener 15.
There was a problem that it was biased towards .

0004

[Problem to be Solved by the Invention] As mentioned above, the left and right sound image distribution lacks uniformity depending on the position of the listener, so it is necessary for the listener to be located in the center between the left and right speakers or to move the speakers. Yes, it was inconvenient. Also, especially if you don't have a suitable place to place the speakers.
This was inconvenient because it was not possible to localize the sound image of the source itself.

In view of the above circumstances, the present invention automatically adjusts the time difference and volume difference between left and right audio signals, regardless of the position of the listener who operates the remote control transmitter, etc. It is an object of the present invention to provide a stereo sound device that allows a uniform sound image distribution to appear.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides left and right speakers each having a sonic sensor that receives sound waves from a remote control transmitter that transmits signals using at least sound waves. , a detection circuit that detects the time difference and volume difference between the outputs of the left and right sound wave sensors, a delay circuit that independently delays the left and right audio signals, a balance control circuit that adjusts the left and right volume difference, and the balance control circuit and the above delay. The stereo audio device main body includes a sound image control section including a control circuit that controls the circuit using a signal from the detection circuit.

[0007]

[Operation] When a sound wave is emitted from the remote control transmitter, depending on the positional relationship between the remote control transmitter and the left and right speakers,
The left and right sound wave sensors receive sound waves with different time and volume differences. At this time, the time difference and volume difference between the output signals of the left and right sound wave sensors are detected, and the delay circuit of the channel that arrives earlier is controlled to delay the audio signal. Furthermore, the volume of the channel with the larger output signal is reduced by a balance control circuit, so that the volume from the left and right speakers is equal to the position of the remote control transmitter (the position of the listener operating the remote control transmitter). Make it clear. Then, the listener can be localized with a sound image that is not biased, and there is no need for the listener to stay in one position, and there is no need to move the speaker.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing an overview of the entire stereo audio system. In front of each of the left and right speakers 1L, 1R, there are sound wave sensors 3L, 3R that receive sound waves from a remote control transmitter 2 that performs various controls of the stereo audio system. is provided. As shown in the block diagram of FIG. 2, inside the main body 4 of the stereo audio device, there is a detection circuit 5 for detecting the time difference and volume difference between the outputs of the left and right sound wave sensors 3L and 3R, and a detection circuit 5 for detecting the time difference and volume difference between the outputs of the left and right sound wave sensors 3L, 3R, Left and right delay circuits 6L that delay signals independently
, 6R, left and right balance control circuits 7L and 7R that adjust the difference in volume between the left and right sides, and a control circuit 8 that controls the delay circuits 6L and 6R and the balance control circuits 7L and 7R using a signal from the detection circuit 5. Sound image control section 4a
is built-in.

Therefore, the sound waves emitted from the remote control transmitter 2 are converted into electrical signals by the left and right sound wave sensors 3L and 3R, and from this signal, the detection circuit 5 determines the arrival time and magnitude of the sound waves emitted from the remote control transmitter 2. is detected. Note that the sound wave sensors 3L, 3R and the remote control transmitter 2 are provided with prohibition means so that they do not react to sound waves other than those from the remote control transmitter. The arrival time and magnitude of the sound wave are transmitted to the control circuit 8, which uses the signal from the detection circuit 5 to control the delay circuits 6L, 6R and the balance control circuit 7L.
, 7R.

Therefore, as shown in FIG. 3, for example, when the listener 9 is located near the right speaker 1R, if the audio signal of the right channel is delayed by the sound image control section 4a and the volume is lowered, Even though the right speaker 1R actually exists at position a, it is simulatively moved to position b, and a sound image 10 is created in front of the listener 9.

[0011]

[Effects of the Invention] As explained above, the present invention allows the delay time of the delay circuit and the attenuation amount of the left and right channels of the balance control circuit to be automatically set so that the sound image is in front of the listener. Since the system is automatically controlled, the listener does not have to stay at a specific position or move the speakers each time he or she uses the stereo sound system, which is extremely convenient.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an overview of the entire stereo sound apparatus of the present invention.

FIG. 2 is a block diagram of a sound image control section.

FIG. 3 is a distribution diagram of a corrected sound image.

FIG. 4 is an explanatory diagram showing an overall outline of a conventional stereo sound device.

FIG. 5 is a distribution diagram of a sound image when a listener is located at the center between left and right speakers in a conventional stereo sound device.

FIG. 6 is a distribution diagram of a sound image when a listener is located close to the right speaker in a conventional stereo sound device.

[Explanation of symbols]

1L left speaker 1R Right speaker 2 Remote control transmitter 3L Left sound wave sensor 3R Right sound wave sensor 4 Main body of stereo sound device 4a Sound image control section 5 Detection circuit 6L left delay circuit 6R Right delay circuit 7L Left balance control circuit 7R Right balance control circuit 8 Control circuit 9 Listener 10 Sound image

Claims (1)

[Claims] Claim 1: Left and right speakers each having a sonic sensor that receives a sound wave from a remote control transmitter that transmits a signal using at least sound waves, and detection that detects a time difference and a volume difference between the outputs of the left and right sound wave sensors. circuit, a delay circuit that independently delays the left and right audio signals, a balance control circuit that adjusts the left and right volume difference,
A stereo audio device comprising a stereo audio device main body including a sound image control section including a control circuit that controls the balance control circuit and the delay circuit using a signal from the detection circuit.