JPH057399A - Acoustic equipment - Google Patents

Abstract

PURPOSE:To add a sound field effect suitable for a music genre to the equipment with simple configuration. CONSTITUTION:A controller 7 controls a 1st adder subtraction means 1 adding or subtracting 2-channels of sound signals in response to a music genre selected by a selection means 6, a delay means 2 delaying the sound signal subject to addition or subtraction by the means 1, a level adjustment means 3 adjusting a level of the sound signal delayed by the means 2, an adder means 4 adding the sound signal adjusted by the means 3 to one channel, and a 2nd adder subtraction means 2 adding the sound signal adjusted by the means 3 to the other channel or subtracting the signal from the other channel. Through the constitution above, various sound effects are obtained comparatively simply and the cost is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio device for reproducing left and right two-channel audio signals, and more particularly to an audio device capable of switching sound field characteristics according to genres.

[0002]

2. Description of the Related Art In recent years, sound field characteristics have been added to 2-channel audio signals (stereophonic signals), and conventionally, for example, measured data of impulse responses of various real sound fields or data corresponding thereto. To simulate the real sound field by convolving a sound signal with a digital signal processor (DSP), and to correct or change it by focusing on the frequency transfer characteristic of the sound field. is there. On the other hand, there is one in which the frequency characteristic is selectively changed depending on the genre of the music to be listened to so as to enhance the acoustic effect. This is because the positions of the respective elements of the graphic equalizer are stored in advance so that they can be instantly reproduced.

[0003]

However, the one using the conventional digital signal processor is difficult to apply to a low-priced audio device because the hardware configuration is complicated and the cost is high. It is difficult to obtain sufficient sound field characteristics for the one that changes only the characteristics.

[0004]

In order to solve the above problems, the present invention delays the audio signal added or subtracted by the first addition / subtraction means for adding or subtracting the audio signals of two channels. Delaying means, level adjusting means for adjusting the level of the audio signal delayed by the delaying means, adding means for adding the audio signal adjusted by the level adjusting means to one channel, and adjustment by the level adjusting means. A second adding / subtracting means for adding or subtracting the generated audio signal to or from the other channel and a selecting means for selecting a music genre are provided. Further, the delay means is arranged to circulate a part of the delayed audio signal.

[0005]

[Operation] According to the genre of music selected by the selection means,
By controlling the subtraction or addition of the first and second adding / subtracting means, the delay time of the delaying means and the level of the level adjusting means, a sound field effect suitable for the genre is obtained.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a configuration diagram of a first embodiment of an audio device according to the present invention, FIG. 2 is a configuration diagram of the second embodiment, and FIG.
4 is a configuration diagram of a combination A of addition and subtraction in the first embodiment, FIG.
5 is a configuration diagram of a combination B of addition and subtraction in the first embodiment, FIG.
6 is a block diagram of a combination C of addition and subtraction in the first embodiment, FIG.
7 is a configuration diagram of an addition / subtraction combination D in the second embodiment, FIG.
Is a block diagram of the delay means E, FIG. 8 is a block diagram of the delay means F, and FIG. 9 is a block diagram of the delay means G.

In the first embodiment of FIG. 1, the first adding / subtracting means 1 has a left channel (hereinafter referred to as L channel).
And the audio signal of the right channel (hereinafter referred to as the R channel) are added or subtracted (for example, the level of the R channel is subtracted from the level of the L channel). The delay means 2 delays the audio signal added or subtracted by the first addition / subtraction means 1. The level adjusting means 3 adjusts the level of the audio signal delayed by the delay means 2. The adding means 4 adds the audio signal adjusted by the level adjusting means 3 to the audio signal of the L channel (which may be the R channel) which is one channel, and outputs it as the audio signal of the L channel. Second addition / subtraction means 5
Is for adding the audio signal adjusted by the level adjusting means 3 to the R channel (which may be the L channel) which is the other channel, or subtracting it from the R channel (which may be the L channel). Output as a signal. The selection unit 6 selects a music genre.
The controller 7 sets the addition or subtraction of the first and second addition / subtraction means 1 and 5 and the delay time of the delay means 2 and the level of the level adjustment means 3 according to the genre selected by the selection means 6. It is controlled by a microcomputer or logic circuit.

Next, the second embodiment of FIG. 2 will be described. The audio signal output from the delay means 2 is fed back to the delay means 2 via the feedback level adjusting means 8, and the feedback level of the feedback level adjusting means 8 is controlled by the controller 7. The other parts are the same as those in the first embodiment, and the description thereof will be omitted. When the level of the feedback level adjusting means 8 is set to "0", it becomes exactly the same as that of the first embodiment.

Combination examples of addition or subtraction of the first addition / subtraction means 1 and the second addition / subtraction means 5 are shown in FIGS. 3 to 6. When the combination A of FIG. 3 uses the first addition / subtraction means 1 for addition and the second addition / subtraction means 5 for subtraction in the first embodiment, the combination B of FIG. 4 subtracts the first addition / subtraction means 1 for the first embodiment in the first embodiment. Two
When the addition / subtraction means 5 is a subtraction, the combination C in FIG.
When the first addition / subtraction means 1 is added and the second addition / subtraction means 5 is added in the embodiment, the combination D of FIG. 6 is the first addition / subtraction means 1 addition and the second addition / subtraction means 5 subtraction in the second embodiment. This is the case.

Next, a specific example of the delay means 2 will be described. In the delay means E shown in FIG. 7, a voice signal is passed through a low pass filter (hereinafter referred to as LPF) 11 to a BBD.
(Bucket Bridge Device) element 12 and input the output of this BBD element 12 to LPF 14
Output via. Here, since the delay time is determined by the number of stages of the BBD element 12 and the clock frequency from the clock generation circuit 13 given to the BBD element 12, the delay time is adjusted by controlling the clock generation circuit 13 by the controller 7. it can.

Further, in the delay means F shown in FIG. 8, the audio signal is passed through the LPF 11 to the CCD (Charge Cou).
input to the device 15)
The output of the D element 15 is output via the LPF 14. Here, the delay time depends on the number of stages of the CCD 15 and the CC
Since it is determined by the clock frequency from the clock generation circuit 13 given to the D element 15, the clock generation circuit 13
Is controlled by the controller 7, the delay time can be adjusted. If the S / N ratio is insufficient, a so-called compander circuit can be added.

Further, the delay means G shown in FIG. 9 is a digital delay using a semiconductor memory, and outputs the audio signal to the LPF2.
1 is inputted to the A / D converter 22 and A / D converted to quantize the audio signal, and after it is stored in the semiconductor memory 23 for a predetermined time, the D / A converter 25 and the LPF 26 are quantized.
It returns to a voice signal via and outputs. Here, the delay time is determined by the storage time of the semiconductor memory 23, and this storage time is controlled by the controller 24. When the input audio signal is quantized, the delay time can be controlled only by the semiconductor memory 23 and the controller 24.

For each of the above embodiments, an example of the combination of the addition and subtraction of the first and second addition / subtraction means 1 and 5 according to the music genre shown in FIGS. 3 to 6 and an example of the level adjustment amount of the level adjustment means 3 are shown. Shown in 1.

[0014]

[Table 1]

For example, in many new music type vocals, the vocals are relatively solid, so the vocals are left as they are to add a sense of depth and expanse to the back performance only. In music, the echo effect is added mainly to the vocal sound localized in the center. In classical music, it adds a spacious sound as a whole. Although the configuration of the first and second addition / subtraction means 1 and 5 and the level adjustment amount of the level adjustment means 3 are switched here, the delay time of the delay means 2 and the feedback level adjustment amount of the feedback level adjustment means 8 are changed. By also switching, it is possible to obtain a sound field effect more suitable for the genre.

[0016]

As described above, according to the present invention, the addition or subtraction of the first addition / subtraction means for adding or subtracting the audio signals of the two channels, or the first addition / subtraction according to the genre of the music selected by the selection means. Since the delay time of the delay means for delaying the audio signal from the means and the level of the level adjusting means for adjusting the level of the audio signal from the delay means are controlled, a sound field effect suitable for the genre is selectively added. The acoustic device can be realized with a relatively simple structure, and the cost can be reduced due to the simple structure, and it can be applied to low-priced portable or vehicle-mounted audio equipment.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of an audio device according to the present invention.

FIG. 2 is a configuration diagram of the second embodiment.

FIG. 3 is a configuration diagram of an addition / subtraction combination A in the first embodiment.

FIG. 4 is a configuration diagram of a combination B of addition and subtraction in the first embodiment.

FIG. 5 is a configuration diagram of a combination C of addition and subtraction in the first embodiment.

FIG. 6 is a configuration diagram of an addition / subtraction combination D in the second embodiment.

FIG. 7 is a configuration diagram of the delay unit E.

FIG. 8 is a configuration diagram of the delay unit F.

FIG. 9 is a configuration diagram of the delay unit G.

[Explanation of symbols]

1 ... First addition / subtraction means, 2 ... Delay means, 3 ... Level adjustment means, 4 ... Addition means, 5 ... Second addition / subtraction means, 6 ... Selection means, 7, 24 ... Controller, 8 ... Feedback level adjustment means, 12 ... BBD element, 13 ... Clock generation circuit, 23 ... Semiconductor memory.

Claims (2)

[Claims] 1. In an audio device for reproducing left and right two-channel audio signals, a first addition / subtraction means for adding or subtracting the two-channel audio signals, and an audio signal added or subtracted by the first addition / subtraction means. Delaying means for delaying, the level adjusting means for adjusting the level of the audio signal delayed by the delaying means, and the adding means for adding the audio signal adjusted by the level adjusting means to one channel,
A second adding / subtracting means for adding or subtracting the audio signal adjusted by the level adjusting means to the other channel and a selecting means for selecting a genre of audio are provided, and the genre selected by the selecting means is provided. An acoustic device characterized in that the subtraction or addition of the first and second adding / subtracting means, the delay time of the delaying means and the level of the level adjusting means are controlled accordingly. 2. The audio device according to claim 1, wherein the delay means circulates a part of the delayed audio signal.