KR940002168B1 - Sound effect apparatus - Google Patents

Abstract

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Description

Sound effect device

1 is a schematic block diagram for explaining the configuration of an acoustic effect apparatus according to one embodiment of the present invention.

2 is a block diagram showing the basic configuration of a digital sound processor in FIG.

3 is a view for explaining the effect of the sound effect device of FIG.

4 is a diagram illustrating an example of reverberation characteristics generated by a digital sound processor.

5 shows reverberation characteristics in a general home.

6 is a view showing a change in reverberation characteristics when the basic sound is lowered.

FIG. 7 is a diagram clearly showing a combination of FIGS. 1 and 2.

* Explanation of symbols for main parts of the drawings

4: Digital Sound Processor 13: Volume Controller

15 microcomputer 21 delay line

22: level controller 23: adder

The present invention relates to a sound effect apparatus which has a sound effect processing on a speech signal using a digital sound processor.

Technological advances in the audio world today have made striking strides to approach the original sound from monaural to stereo and from analog to digital. In recent years, there is a demand for a technology that creates a unique sound field by processing a music source according to the taste of the listener.

There is a sound effect device using a digital sound processor called a surround system as a response to this demand. This device performs various signal processing on 2ch audio signal and outputs 4ch audio to create sound field.

However, recently, in the development of such a sound effect device, it is being carried out to anticipate the sound field of a concert hall or the like and to accept the ringing element. 4 shows an example of reverberation generated by a digital sound processor. In order to create such a realistic sound field, many reverberation components are applied to the basic sound.

However, when a sound that anticipates such a specific sound field is reproduced in a general home, the sound actually audible as shown in FIG. 5, for example, is a sound emitted from a speaker (figure 5a) and a sound reflected from a wall in the room. The remaining amount (figure 5b) generated is added (figure 5c). In addition, it is necessary to listen to the delicate sound in the product development stage, so the sound field is expected based on the relatively loud sound. However, there are many restrictions in the general family, so the volume is often listened to. Therefore, the following problems arise.

That is, as shown in FIG. 6, when the volume is lowered, a component having a low level of reverberation, that is, a reverberant component having a long delay time, is masked by noise in the room and cannot be heard. As a result, there was a problem that the sound was less than the sound field expected at the time of development, so that only a weak sound without a sense of realism could be obtained.

In addition, as can be seen from the Flatter-Munson curve, which is widely known as a human listening sensation, a small volume makes it hard to hear high and low sounds, so that the mortar and clarity disappear. Loudness circuits and the like are known as a means of correcting this, which was insufficient to correct only the basic notes.

As described above, in the conventional sound effect device, a long delay time and a low level component among the reverberation components of the sound field expected at the time of development due to the amount of noise are lost, and thus, the original sound effects cannot be obtained.

An object of the present invention is to solve the above problems and to provide a sound effect device capable of obtaining excellent sound effects inherent in a product even when reproducing by a noise level.

The sound effect device provided with the reverberation means of the present invention comprises a voice signal input terminal 1 and a volume adjusting means 13 for adjusting the volume of the voice signal supplied to the voice signal input terminal to achieve the above object. ), Volume detection means (14, 15) for detecting the volume level set by the volume adjusting means, and a plurality of delay elements having different delay times for supplying the audio signal whose volume is adjusted to obtain a plurality of delay outputs. A plurality of level converting means 22 for inputting the delay means 21 and the respective delay outputs from the delay means, respectively, and reducing the respective delay output levels according to the volume level from the volume detecting means to generate a reverberation sound signal; And reverberation sound adding means 23 for adding the generated reverberation sound signals to the sound signal whose volume is adjusted and outputting the reverberation sound adding means to a speaker. The level converting means is characterized in that the level down amount of each delay output gradually decreases as the delay time increases according to the volume level detected by the sound detecting means.

In the sound effect apparatus of the present invention, the longer the delay time of the corresponding delay means is changed, the higher the level down amount of each level converting means according to the volume detected by the volume detection means. Low level reverberation can be left as a reproducing sound, resulting in the original sound effects.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a block diagram showing the configuration of a sound effect device according to an embodiment of the present invention.

In this figure, "1" is an audio input terminal to which audio signals from a CD, tape recorder, or the like are input. The audio signal input to the audio input terminal 1 is converted into a digital signal by the A / D converter 3 through the low pass filter 2, and a digital sound processor having a reverberation sound unit having a means ( DSP) 4 is input. In this digital sound processor 4, reverberation effect processing is performed by adding a reverberation sound signal to an audio signal. In addition, the audio signal to which the reverberation signal is added is transmitted to the front left and right speakers 1 through the D / A converters 5, 6, low pass filters 7, 8, amplifiers 9, and 10. ) And the left and right speakers 12 are output as audio.

Also, "13" is a volume controller which is a volume control volume for adjusting the volume by the rotational position of the slide. The voltage divided by the slider in this volume controller 13 is input to the microcomputer 15 through the A / D converter 14, and volume detection is performed in this microcomputer 15. FIG.

The volume detecting means for detecting the volume here comprises an A / D converter and a microcomputer. As the volume detecting means, the microcomputer in the apparatus can recognize the position of the volume control operated by the apparatus user. There are several ways to do that.

As described below, there are cases where the electronic volume is used for the volume controller and the general variable resistor is used, but it is not fundamentally different.

(1) How to know the volume setting position mechanically (Example of this case)

Apply a voltage (VB) to the variable resistor, convert the voltage obtained from the intermediate tap into digital data, and write a program of the microcomputer so that the value can be recognized as volume adjustment. The maximum volume adjustment is VB volts, the minimum is 0 volts, and the intermediate position is VB x K volts (0 <K <1). In addition, the volume adjusting body may be mechanically moved to the variable resistance for detection, or may be a method of controlling electronic volume by data from a microcomputer.

(2) how to know electronically

As a program of the microcomputer, the volume is detected in accordance with the subsequent up / down amount by storing the initial setting value of the volume adjustment value or the value when the previous power supply is cut off. Another way to think about it is to enter the volume data directly into the computer.

The volume data detected by the microcomputer 15 is then sent to the digital sound processor 4.

2 is a block diagram showing the basic configuration of the digital sound processor 4.

As shown in this figure, the digital sound processor 4 is provided with a delay means 21, which is a plurality of delay lines for delaying a voice signal at different delay times, and corresponding to each delay line 21, respectively. Reverberation sound comprising a level converting means 22, which is a plurality of level controllers for leveling down the audio signal input through the line 21 to generate a reverberation sound signal, and an adder for adding each generated reverberation sound signal to the voice signal. It comprises a means 23.

A general function of the digital sound processor comprising the delay means, the level converting means and the reverberation sound adding means, but the delay is obtained by transmitting digital data to the center of the memory. In addition, the level change is digital level conversion, and the reverberation sound adding means adds a signal set to the entire delay circuit and the level variable circuit to the original signal. These controls are either pre-programmed or manually set values via the microcomputer.

In the digital sound processor 4, the following three conditions are set in advance.

1) the delay line delay time of the delay means 21

2) Level down value by the level converting means 22 which is a level controller

3) the number of combinations of the delay means 21, which is a delay line to be used, and the level converting means 22, which is a level controller;

However, the level down value of each level controller 22 is equally changed in accordance with the volume detected by the microcomputer 15 during the setting of these conditions.

Next, the operation of the device of this embodiment will be described.

First, when the volume is set in the volume controller 13, the volume is detected by the microcomputer 15 and the data is input to the level converting means 22 which is each level controller of the digital sound processor 4.

Then, the level converting means 22, which is each level controller, compares the volume detected by the microcomputer 15 with the volume at the time of setting the condition of the digital sound processor 4, and thus the condition of the detected digital sound processor 4 as a result. When it is determined that the volume is smaller than the volume at the time of setting, the longer the delay time of the delay means 21 corresponding to the delay line, the larger the ratio, that is, the longer the delay time, the smaller the level down value of the delay output. Change the value of the Rebecca down for audio signal. In the level converting means 22 which is each level controller, the level down value is changed continuously or stepwise depending on the difference between the volume at the time of condition setting and the detected volume. Accordingly, as shown in FIG. 3, the level of the reverberation sound with a long delay among the reverberation sound signals at the time of reproduction by the amount of noise becomes high, and it is possible to leave this reverberation component in the reproduction sound.

In Fig. 1, the volume controllers of the whole apparatus can be considered in various ways, so that they can include all of them. Therefore, in order to make the gist of the present invention clear, FIG. 8 is a view showing the position of the volume controller and combining it with FIG. 1 and FIG.

In FIG. 8, the front delay and the rear delay are different to clarify the signal line on the front rear side. FIG. 2 shows the processing of the L and RL2ch portions, so the addition portion is shown differently from FIG. How to execute these There are various implementation methods by the function of DSPIC.

The point of the present invention is to automatically adjust the level of the reverberation sound set in the digital sound processor by a preset program using a value that controls the overall volume obtained by the volume detection means. (Delay time when the volume is low. The level down amount by level conversion of this long reverberation sound output is reduced).

In this way, according to the sound effect apparatus of the present embodiment, the original sound effect can be obtained even when the sound quantity is reproduced.

In addition, in the above-described embodiment, the present invention is applied to having a volume adjusting means having a slide, but it can be applied to an apparatus using an electronic volume controller. The microcomputer may also include an A / D converter.

As described above, according to the sound effect device of the present invention, a reverberation sound component having a long delay time and a low level can be left even in a sound field due to the amount of noise, and as a result, an original sound effect of the product can be obtained.

Claims (1)

The audio signal input terminal 1, the volume adjusting means 13 for adjusting the volume of the audio signal supplied to the audio signal input terminal, and the volume detecting means 14 for detecting the volume level set by the volume adjusting means. 15) and delay means 21 for supplying a plurality of delay elements each having a different delay time to obtain a plurality of delay outputs, and a delay output from the delay means, respectively. A plurality of level converting means 22 for generating a reverberation sound signal by lowering each delay output level in accordance with the volume level from the volume detecting means, and the generated reverberation sound signal to the sound signal whose volume is adjusted. And reverberation sound adding means 23 for additionally outputting, and means for supplying the output of the reverberation sound adding means to the speaker, wherein the level converting means is adapted according to the volume level detected by the volume detecting means. Sound effect device for the level-down value of the delay output, it characterized in that the delay time is long so that just as gradually decreases change.

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