JPH03219799A - Sound effect equipment - Google Patents

Abstract

PURPOSE:To obtain a substantial acoustic effect even at reproduction of a small sound volume by revising the value of level-down of an audio signal at generation of a reverberation signal in response to the setting sound volume with a sound volume adjustment variable resistor according to a delay time. CONSTITUTION:An input audio signal is subject to level-down by a relevant level controller 22 via a delay line 21 with a different delay time in a digital sound processor and a sound volume data of a reverberation basic sound in a setting sound by a sound volume adjusting variable resistor is added to be an effect sound and the result is outputted. The detected sound volume of the inputted reverberation basic sound and the sound at the condition setting of the digital sound processor are compared and when the detected sound volume is small, the level-down value is set larger as the delay time is longer, and even in the case of a small sound volume field, the reverberation sound component with a longer delay time and low level remains and the substantial excellent reverberation sound effect is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a sound effect device that performs sound effect processing on an audio signal using a digital sound processor.

(Prior art) Technological progress in the field of audio today is remarkable.
Technology has been changing from monaural to stereo, and even from analog to digital in order to get closer to the original sound. Furthermore, in recent years, there has been a high demand for technology that creates original sound fields by processing music sources and the like according to listeners' preferences.

To meet these demands, there is, for example, a sound effect device called a Surando system that uses a digital sound processor. This device performs various signal processing on 2ch audio signals, outputs 4ch audio, and creates a sound field.

Incidentally, recently, in the development of such sound effect devices, efforts have been made to incorporate sound elements assuming a sound field such as a concert hall.

FIG. 4 shows an example of reverberation created by a digital sound processor. In this way, in order to create a realistic sound field, many reverberation components are added to the fundamental tone.

However, when sound is reproduced assuming such a specific sound field in a general home, for example, as shown in Figure 5, the actual sound that can be heard is the sound radiated from the speakers (Figure 5- In addition to a), the reverberation that occurs when the sound is reflected from walls etc. in the room (Figure 5 = b) or the reverberation (Figure 5 -
It becomes 〇). Also, at the product development stage, the sound field is assumed to be based on relatively loud sounds because of the need to hear small sounds.

However, in ordinary households, people often listen with the volume turned down due to various restrictions. This causes the following problems.

That is, as shown in FIG. 6, when the volume is lowered, low-level components of the remaining snow, that is, reverberant components with long delay times, are masked by room noise and cannot be heard. As a result, a problem has arisen in that the sound field is less resonant than the sound field envisioned at the time of development, and only a thin sound without a sense of presence can be obtained.

Furthermore, as shown by the Fletcher Munson curve, which is a well-known characteristic of human hearing, when the volume is low, it becomes difficult to hear high and low tones, resulting in a loss of both power and clarity. Although loudness circuits and the like are well known as means for correcting this, correcting only the fundamental tone is insufficient.

(Problem to be Solved by the Invention) In this way, in conventional sound effect devices, when playing back at a low volume, the components with long delay times and low levels among the reverberation components of the scene assumed at the time of development are erased. There was a problem in that the original acoustic effect of the product could not be obtained.

The present invention is intended to solve such problems, and aims to provide a sound effect device that can obtain the excellent sound effects inherent to the product even when playing at a low volume.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the sound effect device of the present invention includes a volume adjustment volume for adjusting the volume, and a sound f
a volume detection means for detecting the volume set by the f1l adjustment volume; a plurality of delay means for delaying the input audio signal by different delay times; and a plurality of delay means provided corresponding to each of the delay means, a plurality of level converting means for respectively lowering the level of the audio signals delayed by the means to generate reverberant sound signals; and each of the generated reverberant sounds f.
a reverberation sound adding means for adding and outputting a number a to the audio signal, and a sound volume detected by the sound volume detection means,
and means for changing the level down value of each of the level conversion means at a larger rate as the delay time of the corresponding delay means is longer.

(Function) In the sound effect device of the present invention, the level down value of each level conversion means is changed at a larger rate as the delay time of the corresponding delay means is longer, depending on the volume detected by the volume detection means. Therefore, even when the volume is low, it is possible to leave reverberation components with long delay times and low levels in the reproduced sound, and as a result, the original acoustic effect of the product can be obtained.

(Example) Embodiments of the present invention will be described below based on the drawings.

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

In the figure, reference numeral 1 denotes an audio input terminal into which audio signals from a CD, tape recorder, etc. are input.

The audio signal input to the audio input terminal 1 passes through a low-pass filter 2, is converted into a digital signal by an A/D converter 3, and is input to a digital sound processor CD5P) 4, which is a reverberation sound adding means. . In this digital sound processor 4, reverberation effect processing is performed by adding a reverberant sound signal to the audio signal. Furthermore, the audio signal to which the reverberation sound signal has been added passes through a D/A converter 5.6, a low-pass filter 7.8, and an amplifier 9.10 to the front left and right speakers 11 and the rear left and right speakers 12. It is output as audio.

Further, numeral 13 is a volume for adjusting the volume, which adjusts the volume according to the rotational position of the slider. The voltage divided by the slider in the volume adjustment volume 13 is input to the microcomputer 15 through the A/D converter 14, and the microcomputer 15 detects the volume. The volume data detected by the microcomputer 15 is sent to the digital sound processor 4.

FIG. 2 is a block diagram showing the basic configuration of the digital sound processor 4. As shown in FIG.

As shown in the figure, this digital sound processor 4 includes a plurality of delay lines 21 that delay audio signals by different delay times, and each delay line 21
are provided corresponding to each day line 2.
a plurality of level controllers 22 that lower the level of audio signals input through 1 to generate reverberant sound signals;
Adder 23 that adds the generated reverberant sound signal to the audio signal
It is composed of:

By the way, in this digital sound processor 4, the following three conditions are set in advance.

■Delay time of each delay line 21■Value of level down by each bell controller 22■Delay line 21 and level controller 2 used
However, among these condition settings, the level down value by each level controller 22 is changed according to the volume detected by the microcomputer 15, and the delay time of the corresponding delay line 21 is changed. The longer the level controller 22, the greater the rate of change.

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

First, when the volume is set with the volume adjustment volume 13,
The volume is detected by the microcomputer 15,
The data is input to each level controller 22 of the digital sound processor 4.

Then, each level controller 22 compares the volume detected by the microcomputer 15 with the volume at the time of condition setting of the digital sound processor 4, and as a result,
If it is determined that the detected volume is lower than the volume at which the conditions were set for the digital sound processor 4, the level of the audio signal is lowered at a greater rate as the delay time of the corresponding delay line 21 is longer, depending on the difference in volume. Change the value of

Note that the level down value in each level controller 22 is changed continuously or in stages depending on the difference between the volume at the time of setting the condition and the detected volume.

As a result, as shown in FIG. 3, the level of the reverberant sound with a long delay time among the reverberant sound signals during reproduction at a low volume increases, and it becomes possible to leave this reverberant component in the reproduced sound.

Thus, according to the sound effects device of this embodiment, the original sound effects of the product can be obtained even during playback at a low volume.

In the above-described embodiment, the present invention is applied to a device equipped with a volume control volume having a slider, but it goes without saying that the present invention can also be applied to a device using an electronic volume control volume. Also, the microcomputer has an A/D
It may also include a converter.

[Effects of the Invention] As explained above, according to the acoustic effect device of the present invention, even in a sound field with a small volume, it is possible to leave a reverberant sound component with a long delay time and a low level. sound effects can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram for explaining the configuration of a sound effects device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the basic configuration of the digital sound processor in FIG. 1, and FIG. 1 is a diagram for explaining the effect of the sound effect device, FIG. 4 is a diagram showing an example of reverberation characteristics created by a digital sound processor, FIG. 5 is a diagram showing reverberation characteristics in a general home, and FIG. The figure shows changes in reverberation characteristics when the basic volume is lowered. 4...Digital sound processor, 13...Volume for one round adjustment of volume, 15...Microcomputer, 21...Delay line, 22...Level controller, 23...Adder.

Claims (1)

[Scope of Claims] A volume adjustment volume for adjusting the volume, a volume detection means for detecting the volume set by the volume adjustment volume, and a plurality of audio signals that delay input audio signals by different delay times. a plurality of level converting means provided corresponding to each of the delay means, each of which lowers the level of the audio signal delayed by each of the delay means to generate a reverberant sound signal; and each of the generated reverberant sound adding means for adding a reverberant sound signal to the audio signal and outputting the resultant sound signal; and adjusting the level down value of each of the level converting means according to the volume detected by the volume detecting means to the corresponding delay means. A sound effect device comprising means for changing a delay time at a larger rate as the delay time becomes longer.