KR970010640B1 - Flutter echo attenuation method and apparatus of acoustic system - Google Patents

Abstract

Plotter echo reduction of acoustic device is practiced as follows; (a) Abstract the signal for vocal sound and for accompaniment from the digital vocal signal impressed and abstracted from replaying means or receiving frequency. (b) Extend to support reflection effect to the signal for abstracted vocal sound, and support reflection effect and reverb effect to the signal for accompaniment with limit. (c) Compound the signal for sound which reflection effect is extended to be supported with the signal for the accompaniment which reflection effect and reverb effect is limited to be supported, which amplifies to regular level to output.

Description

Flutter echo attenuation method of sound equipment and apparatus therefor

1 is a block diagram of a conventional acoustic device.

Figure 2 is a block diagram for implementing a three-dimensional sound in a conventional sound equipment.

3 is a block diagram of a flutter echo canceller of an acoustic apparatus according to the present invention.

4 is a block diagram showing another embodiment of the present invention shown in FIG.

* Explanation of symbols for main parts of the drawings

1: A / D converter 2: DSP (Digital Signal Processor)

3: D / A converter 4: control part

11 buffer 12 a first mixer

13 filter unit 14 second mixer

15: reflection wave forming unit 16: reverberation wave forming unit

17: amplifier 21 21: buffer

22: beep separation unit 23: the first buffer

24: second buffer 25: first reflection wave forming portion

26: high pass filter 27: phase correction circuit

28: third buffer 29: third mixer

30: second reflection wave forming portion 31: reverberation wave forming portion

32: amplifier 110: fourth buffer

120: fourth mixer

The present invention relates to an acoustic device, and in particular, to restrict the expansion of the accompaniment signal in the reproduction of a predetermined recording medium or the generation of a sound field through the reception frequency, and to provide a sense of diffusion and space for the audio signal to provide a more stable three-dimensional sound. The present invention relates to a flutter echo attenuation method of an acoustic apparatus for listening and a device thereof.

In general, sound equipment generates a predetermined sound field by playing from a predetermined recording medium or receiving a frequency from a broadcasting station. When the delay effect of the filter increases in the generated sound field signal, a separate pulse signal is detected and acts as a noise flutter. Flutter Echo phenomenon occurs.

FIG. 1 is a block diagram illustrating a conventional sound device, and as shown in the figure, a left and right analog sound source signal extracted from a frequency received from a reproducing means or a broadcasting station is converted into a digital signal. A / D converter (1), DSP (2) to support stereoscopic sound with real-time sound to digital sound source signal through this A / D converter (1), and digital sound source signal to which stereo sound effect is applied and applied D / A converter 3 for converting to a sound source signal, and a control unit 4 for controlling the overall operation for stereoscopic sound support by applying a predetermined control signal to the DSP 2 side in accordance with a key signal applied from the key input means. It is composed of

In addition, FIG. 2 is a block diagram illustrating a stereoscopic sound in a conventional acoustic apparatus. As shown in the drawing, the buffer unit 11 buffers the digital sound source signals of the left L and the light R. As shown in FIG. ), The first mixer 12 mixing the left sound source signal L and the write sound source signal R passing through the buffer unit 11, and only the frequency components of the predetermined band in the digital sound source signal to be mixed and applied. The filter unit 13 to extract, the reflection wave forming unit 15 to support the reflection effect (diffusion) on the digital sound source signal passing through the filter unit 13, and the predetermined sound source signal to which the reflection effect is not supported. Reverberation wave forming unit 16 to support the reverb effect (sense of space) and amplification unit 17 to amplify the sound source signal output by the reflection effect (diffusion) and reverb effect (sense of space) to a predetermined level. Is done.

In the conventional acoustic device as described above, the reflection effect (diffusion) and the reverb effect (space feeling) are supported for the digital sound source signal through the reproduction or reception frequency, and the reflection effect (diffusion feeling) and reverb for the accompaniment signal sound are output. Since the effect (spatiality) is formed to be larger than the reflection effect (diffusion) and reverb effect (spacey) on the voice signal, and a large delay of the filter is generated. There was a problem with this.

SUMMARY OF THE INVENTION In view of the above-described problems, an object of the present invention is to extract a sound signal portion and an accompaniment signal portion from a sound source signal applied through a reproduction or reception frequency from a predetermined recording medium, and then reflect the reflection effect on the accompaniment signal portion (diffusion). It provides limited spatial reverberation and reverb effect (sense of space) and expands the reflection effect on the voice signal part to provide stable spatial sound listening.

In addition, another object of the present invention is to connect the microphone (MIC) of the external voice input means to a predetermined mixer side to limit the separated extracted voice signal and to mix the accompaniment signal and the external voice signal to be used as a flexible half period .

In order to achieve the above object, the present invention provides a sound process comprising: a first process of separating and extracting a signal portion for speech and a signal portion for accompaniment from a digital sound source signal extracted and applied from a reproduction means or a reception frequency; And a second process of extending and supporting a reflection effect on the signal for the speech extracted and extracted in the first step, and by supporting the reflection and reverb effects on the signal for the accompaniment; And a third process of amplifying and outputting a signal and a signal for the supported accompaniment with limited reflection and reverb effects, and outputting the amplified output to a predetermined level.

In addition, in an acoustic device having a buffer means for controlling the flow of the digital sound source signal, the sound signal separating means for separating and extracting the signal for the sound and the signal for the accompaniment from the sound source signal applied through the buffer means, and the separation First reflecting wave forming means for supporting a reflection effect on the extracted speech signal, filtering means for filtering only frequency components of a predetermined band in the signal for the separated accompaniment, and delayed phases of the filtered frequency components Phase correction means for correcting, second reflection wave forming means for supporting a reflection effect on a signal for accompaniment through the phase correction means, and reverberation for supporting a reverb effect on a signal in which the reflection effect is not supported in the signal for the accompaniment A wave forming means and a signal for the reflection-supported voice and a half supported with the reflection and reverb effects Provided is a flutter echo attenuation apparatus for an acoustic apparatus, comprising amplifying means for amplifying and outputting a signal for a main signal to a predetermined level.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a block diagram of a flutter echo attenuator of an acoustic device according to the present invention, and FIG. 4 is a block diagram showing another embodiment of the present invention shown in FIG.

As can be seen in FIG. 3, the present invention provides a buffer unit 21, a signal tone separation unit 22, a first buffer 23, a second buffer 24, a first reflection wave forming unit 25, and a high range. The filter 26, the phase correction circuit 27, the third buffer 28, the third mixer 29, the second reflecting wave forming portion 30, the reverberation wave forming portion 31, the sound signal separation unit ( 22 separates and extracts a signal for voice and a signal for accompaniment from a digital sound source signal of a left L and a light R, which are buffered and applied through the buffer unit 21, and then extracts a signal for voice. The signal for accompaniment is applied to the second buffer 24 side. The first buffer 23 and the second buffer 24 buffer the signal for the applied voice and the signal for the accompaniment. The first reflection wave forming unit 25 is a wideband reflection wave forming unit and expands and supports a wide reflection effect (diffusion) on a signal applied through the first buffer 23 to the amplifier 32. The high pass filter 26 passes only a signal component of a high frequency band in a signal for accompaniment applied through the second buffer 24 and filters a signal sound of a low frequency band. The phase correction circuit unit 27 corrects the phase delayed by the generation of the delay time in the signal for the accompaniment applied through the high pass filter 26 to the second reflected wave forming unit 30 through the third buffer 28. Is authorized. The second reflection wave forming unit 30 applies a narrow reflection effect (diffusion) to the signal for the hemisphere to which the phase correction is applied and then applies it to the amplifying unit 32 side. The reverberation wave forming unit 31 supports the reverb effect (space feeling) to the signal for the accompaniment in which the reflection effect is not supported, and feeds back the mixed signal with the signal for the accompaniment through the third buffer 28.

Referring to the operation of the present invention having a function as described above is as follows.

The left sound source signal L and the right sound source signal R, which are extracted from the reproduction means or the reception frequency and are converted into digital signals, are buffered by the buffer unit 21, and then the signal sound separation unit 22 is buffered. Is applied to. The signal separating unit 22 separates the signal portion for the voice and the signal portion for the accompaniment from the left sound source signal L and the right sound source signal R to be applied, and then extracts the signal portion for the voice from the first buffer 23. After buffering through), it is applied to the first reflection wave forming unit 25 and at the same time the signal portion for accompaniment is applied to the high pass filter 26 through the second buffer 24. The first reflection wave forming unit 25 extends and supports a broad reflection effect (diffusion) of the signal for the applied voice and applies it to the amplifying unit 32, and the high pass filter 26 is applied to the applied accompaniment. Only the signal components of the high frequency band are passed through the signal and the signal components of the low frequency band are filtered and then applied to the phase correction circuit unit 27. The phase correction circuit unit 27 searches whether the signal for the applied accompaniment has a delayed phase in the filtering operation through the high pass filter 26. When the delayed phase is detected, the phase correction circuit compensates and restores the phase value. It is applied to the second reflection wave forming portion 30 side through the third buffer 28. The second reflection wave forming unit 30 applies a narrow reflection effect, i.e., a diffusion effect, to the amplifying unit 32 side by applying a narrow reflection effect to a signal for an accompaniment to which the high frequency component is extracted and then phase-corrected. A signal that is not supported (diffusion feeling) is applied to the reverberation wave forming unit 31 side. The reverberation wave forming unit 31 provides a reverb effect (space feeling), ie, grandeur, to the signal for the accompaniment to be applied, and then feedback and mixes the accompaniment with the phase correction. In this case, the amplifying unit 32 amplifies the signal for the voice with the extended reflection effect and the reverb effect and the signal for the supported accompaniment to a predetermined level, and then outputs the voice output means, that is, the front left speaker, the front right speaker, The rear left speaker and rear right speaker provide users with stable spatial stereo sound.

In addition, as shown in FIG. 4 attached to another embodiment of the present invention, the signal for the voice extracted by the signal separation unit 22 is buffered by limiting the band of the frequency through the buffer 110 and the jack ( It is used as a flexible half cycle by mixing a voice signal applied from a microphone (MIC) connected to an external voice input means and a digital accompaniment signal extracted from reproduction or frequency reception.

As described above, the present invention separates and extracts a signal for accompaniment and a signal for accompaniment from a digital sound source signal extracted from a reproducing means or a reception frequency, and supports the reflection effect on the signal for speech and reflects the signal for accompaniment. Supports limited effects and reverb effects, providing a sense of stability and stereoscopic sound with a sense of diffusion and space.

Claims (8)

A sound device comprising: a first step of separating and extracting a signal portion for an audio signal and a signal portion for an accompaniment from a digital sound source signal extracted and applied from a reproduction means or a reception frequency; The second process of supporting the extended reflection effect on the signal for the accompaniment and limiting the reflection effect and the reverb effect on the signal for the accompaniment, and the signal and the reflection effect and the reverb effect for the voice with the extended reflection effect is limited And a third process of amplifying and outputting a signal of a supported accompaniment to a predetermined level. 2. The method of claim 1, further comprising: removing and filtering a low frequency component of a predetermined band from a signal for an accompaniment separated in the first step; and applying a frequency signal of a high frequency band applied after performing the filtering operation of the first step. And a second step of detecting and compensating for the delayed phase in the audio device. The method of claim 2, wherein the delayed phase compensation operation is automatically adjusted according to a user's key setting. An acoustic device having a buffer means for controlling the flow of a digital sound source signal, comprising: a signal sound separation means for separating and extracting a signal for accompaniment and a signal for accompaniment from a sound source signal applied through the buffer means; A first reflection wave forming means for supporting a reflection effect on the signal for the extracted voice, filtering means for filtering only a frequency component of a predetermined band in the signal for the separated extraction accompaniment, and corrected delayed phase among the filtered frequency components Phase correction means, second reflection wave forming means for supporting a reflection effect on a signal for accompaniment through the phase correction means, and a reverberation wave supporting a reverb effect for a signal in which the reflection effect is not supported in the signal for the accompaniment Forming means and a signal for the reflection-supported voice and the accompaniment with the reflection and reverb effects. Mixing a signal with a flutter echo attenuation device of the acoustic apparatus comprising an amplification means for amplifying the output to a predetermined level. 5. The apparatus of claim 4, wherein the first reflecting wave forming means extends a signal for speech by supporting a broad reflection effect, and the second reflecting wave forming means supports narrowing reflection effect to provide a reflection effect of the signal on the accompaniment. Flutter echo attenuator of an acoustic device, characterized in that the restriction. 5. The flutter echo attenuator according to claim 4, wherein the filtering means comprises a high pass filter which removes low frequency signal components and extracts only high frequency signal components from the signal for the accompaniment. 5. The apparatus of claim 4, wherein the phase correction means is operated according to a user's key setting and compensates by finely adjusting a delayed phase during filtering. The method of claim 4, wherein the buffer 110 for buffering the sound source signal for the voice extracted by the tone separating means to reduce the frequency band, and the external connection through the jack to the sound source signal for the reduced frequency band; Flutter echo attenuation apparatus of an acoustic apparatus, characterized in that used as a flexible half cycle by connecting the voice input means.