JPS63123300A - Stereoscopic amplifying device and acoustic effect device - Google Patents

Abstract

PURPOSE:To obtain a good quality by inputting a sound signal from a microphone to plural delaying circuits with a different delaying time and synthesizing the output of the delaying circuits and an original sound signal. CONSTITUTION:An electric signal, in which a signal from a microphone is amplified, is inputted directly or a suitable filtering circuit to a delay circuit. The outputs of individual delay circuits are constituted to be added through a variable resistor with the input of the delay circuit. The output of respective delay circuits is made into the suitable size through the variable resistor, synthesized with the original sound signal, amplified by a power amplifier and plural speakers are driven. Since a sound signal with a phase change occurs it random and with a suitable frequency from respective speakers, a good quality attendance feeling is obtained when the sound is heard with both ears.

Description

DETAILED DESCRIPTION OF THE INVENTION [Background of the Invention] The present invention relates to a sound effect method for audio. Some playback devices for stereo music signals recorded on records or cassette tapes are equipped with independent analog delay circuits for the left channel and the right channel to create a realistic effect.

Since this functions with a relatively short delay time, low-cost ICs with stage-connected FETs are used, while high-performance ICs use expensive AD converters, memory, and D-A converters.
A system consisting of converters is used.

The former has performance problems when the delay time is increased, and the latter has high costs.

This proposal is for adding acoustic effects to audio signals from a microphone, and relates to a device that adds 11 mutually independent acoustic effects to the original input signal to create a sense of presence. A device commonly called a karaoke set comes with a function called an echo.

Conventional echo functions have been limited in the playback range due to a combination of poor reproduction characteristics of noise and high-frequency components of audio signals, long delay times, and cost, and have limited the sound reproduction range only in the midrange. The current situation is that they are returning.

In order to create a sense of realism using a high-performance AD-DA converter, high-frequency component performance is required. Although it is possible to expand the tonal range at a higher cost, there was no idea of incorporating multiple units, which would be expensive even for just one unit. For the reasons mentioned above, even in devices that have a stereo playback function, the audio signal from the microphone is currently supplied to both left and right channels through a single echo effect function.

To solve this problem, we need a low-cost, high-performance unit with a delay time of 0.1 to 0.2 seconds in at least a 211I configuration.

Since the audio delay performance satisfies the above conditions by using the acoustic No. 13 and video signal coding and demodulation method disclosed in the patent application pending for patent @ 61-197725, the peripheral circuitry was converted into a gate array to create an audio delay circuit. As a result of making and testing multiple units, a very good sense of realism was obtained.

[Structure of the Invention] An electrical signal obtained by amplifying the signal from the microphone is input to the delay circuit directly or through an appropriate filter circuit. The output of each delay circuit is configured to be added to the input of that delay circuit through a variable resistor. The output of each delay circuit is made to an appropriate size through a variable resistor, combined with the original audio signal, and amplified by a power amplifier to drive multiple speakers.

Audio signals with phase changes are randomly generated from each speaker at an appropriate frequency, so listening to the sound with both ears provides a high-quality sense of realism.

As explained above, when the output of a delay circuit is returned to the input side, there are two ways: adding it to the input side of the delay circuit, and adding it to the input of the delay circuit (No. 8). However, very high quality sound effects can be obtained.

[Effects of the invention] It is difficult to explain the sense of presence in words, but in general, it is achieved by moderately changing the phase and arrival time of the daiba flowing from different directions from the midrange to the treble range. It will be done.

This condition is satisfied because the multiple delay units used in the experiment have sufficient performance together.

As explained above, this idea seems self-evident, but because there was no low-cost, high-performance delay unit, attention was paid to the fact that it adds multiple acoustic effects to the signal from a single microphone. This proves to be a new way to obtain high-quality sound effects.

Claims (1)

[Claims] An audio electrical signal obtained by amplifying the electrical signal from one system of microphones is input directly or through an arbitrary filter to two or more analog signal delay circuit groups having different delay times, and the above analog signal delay circuit group Part or all of the outputs of the individual delay circuits are added to the input signal of the delay circuit from which the output is taken out or to the input of another delay circuit, and part or all of the outputs of the individual delay circuits A stereo amplification device or a sound effect device having a built-in sound effect function, characterized in that all outputs and original audio electrical signals are synthesized to obtain two or more output signals as a whole.