JPH0573084A - Reverberation addition device - Google Patents

Abstract

PURPOSE:To provide the reverberation addition device which suppresses a decrease in the articulation of a signal to be listened to and generate a sound field with extent. CONSTITUTION:An input signal X(t) is inputted to the acoustic power calculating circuit 12 of a relative variation quantity detecting circuit 11 to find acoustic power P(t) and a relative variation calculating circuit 13 outputs the relative variation quantity d(t) of the acoustic power P(t). An output control circuit 14 controls the input signal X(t) with the variation quantity d(t) to obtain a signal X'(t) by cutting only a large rising part of the input signal. Namely, the input signal is outputted as it is for a certain time from when the level value of the signal d(t) exceeds a specific value and reverberation processing is performed for the input signal only for the period; and an adding circuit 16 adds its reverberation sound and the input signal to obtain an output signal Y(t) which has reverberation only at the large rising part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverberation adding device in a sound reproducing device, and more particularly to a structure capable of preventing deterioration of clarity even when reverberation is added.

[0002]

2. Description of the Related Art In a sound reproducing device, as a reverberation adding device used to obtain a feeling of expanse of reproduced sound,
As shown in FIG. 3, the input signal X (n) and a signal in which reverberation is added by the reverberation adding circuit 1 to all the input signals X (n) are combined by the adder circuit 2 and the combined output Y
It is known to reproduce (n).

[0003]

In such a conventional reverberation adding apparatus, reverberation is added to all input music signals. Therefore, when the reverberation time is increased in order to increase the spaciousness, the received signal becomes unclear, resulting in an unpleasant sound. An object of the present invention is to provide a reverberation adding device that suppresses a reduction in the clarity of a received signal and creates a sound field having a spread.

[0004]

In order to achieve such an object, the present invention provides a signal reverberation processing means for performing reverberation processing on an input signal at a predetermined reverberation time, and the reverberation processed signal. Relative change amount detecting means for detecting a relative change amount of acoustic power with respect to time of an input signal in a reverberation adding device that includes a signal synthesizing means for synthesizing an input signal and reproduces and outputs the synthesized signal to obtain a reverberation effect. And a signal component extracting means for extracting a signal component having a steep rising edge of the input signal based on the detected relative change amount and outputting only the extracted signal component to the signal reverberation processing means. The feature is that the reverberation processing is performed only on the signal component whose signal rises steeply.

[0005]

In the present invention, the relative change amount of the acoustic power with respect to time of the input signal is detected, the rising portion of the input signal is cut out based on the detected signal, and reverberation is added only to the cut out portion. Since this is combined with the input signal to obtain an output signal with reverberation, it is possible to suppress a decrease in the clarity of the received signal and to create a sound field with a spread.

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows a configuration of an embodiment of a reverberation adding device according to the present invention. Reference numeral 11 is an acoustic power relative change amount detection circuit, 12 is an acoustic power calculation circuit including an integrator, and the like.
Reference numeral 3 denotes a relative change calculation circuit including a subtraction / division circuit, a differentiation circuit, etc. These circuits 12 and 13 constitute the relative change amount detecting means. Reference numeral 14 is an output control circuit including a microcomputer for controlling the output gain, which constitutes the signal component extracting means. Reference numeral 15 is a reverberation circuit as a signal reverberation processing means, and 16 is an addition circuit as a signal synthesis means.

FIG. 2 shows the signal waveforms of the respective parts of FIG. 1, where (a) is the waveform of the input signal X (t) and (b) is the waveform of the acoustic power P (t) from the acoustic power calculation circuit 12. ,
(C) is the relative change amount d from the relative change calculation circuit 13.
The waveform of (t), (d) shows the waveform of the output signal X ′ (t) of the output control circuit 14.

In FIG. 1, a relative change amount detection circuit 11
2 detects the relative change amount d (t) of the acoustic power P (t) with respect to time of the input signal X (t) of FIG. 2A, and is composed of two circuit blocks.

In the acoustic power calculation circuit 12, the input signal X
The sound power P (t) [(b)] of (t) is obtained for each period τ, and the value of this period τ varies depending on the purpose, but is 1
00ms to 500ms is appropriate (at least a period of 10Hz, 100ms or more), and if it is too long, the characteristics of the music signal cannot be grasped.

Further, the relative change calculation circuit 13 obtains the relative change amount d (t) shown in FIG. 2C from the sound power P (t) obtained as described above by the following equation. d (t) = P (t) -P (t-1) / P (t)

The signal d obtained by these processes
(T) is input to the output control circuit 14. At the same time,
An input signal X (t) is also input to the output control circuit 14, and the control circuit 14 controls the input signal X (t) by the signal d (t) to increase the rising edge of the input music signal. A signal X ′ (t) [FIG. 2 (d)] obtained by cutting out only a large part of the attack of each musical instrument sound) is obtained.

Specifically, the relative change amount d in FIG. 2 (c)
The larger the value of (t) is, the larger the rising of the sound is. Therefore, the time when the level value of the signal d (t) exceeds the set value h, for example, from t ₁ to the input signal X at an interval of time k. By outputting (t) as it is and not outputting it at a later time, an output signal X ′ (t) as shown in FIG. 2D is obtained. The set value h is, for example, the average value of the powers of all music signals, and the time k is set to a value at which the system works effectively.

Next, the signal X'obtained by cutting out only the sharp rising portion of the music signal obtained by the output control circuit 14.
(T) is input to the reverberation circuit 15, where reverberation processing is performed, and the reverberation sound obtained by this is combined with the direct sound as the input signal X (t) by the addition circuit 16 to reverberate only a portion with a large rise. An output signal Y (t) with a load is obtained.

[0014]

As described above, according to the present invention, the reverberation is added only to the sharp rising sound of the input signal. The sharp rising sound of the input signal determines the characteristic of the music on the time axis. Since it is an element, adding reverberation only to this does not impair the conventional sense of spaciousness. In addition, reverberation is not added to other sounds, compared to the conventional reverberation adding device,
The density of extra reverberation is reduced, which increases the clarity.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a reverberation adding device according to the present invention.

FIG. 2 is a signal waveform diagram of each part of FIG.

FIG. 3 is a block diagram of a conventional reverberation adding device.

[Explanation of symbols]

 11 Relative Change Detection Circuit 12 Acoustic Power Calculation Circuit 13 Relative Change Calculation Circuit 14 Output Control Circuit 15 Reverberation Circuit 16 Adder Circuit

Claims (1)

[Claims] 1. A reverberation processing means for reverberating an input signal at a predetermined reverberation time, and a signal synthesizing means for synthesizing the input signal and the reverberated signal. In a reverberation adding device for reproducing and outputting a reverberation effect, a relative change amount detecting means for detecting a relative change amount of the acoustic power with respect to time of the input signal, and the input signal based on the detected relative change amount. A signal component extracting means for extracting a signal component having a sharp rise and outputting only the extracted signal component to the signal reverberation processing means, the signal reverberation processing means having a sharp rise of the input signal. A reverberation adding device characterized by being configured to perform reverberation processing only on signal components.