KR930014259A - Sound synthesis circuit - Google Patents

Abstract

The sound synthesizing circuit is a circuit for synthesizing and outputting an audio signal to an acoustic signal reproduced from a recording medium. This circuit is an external audio signal reproduced on an analog stereo signal output from a D / A converter in an audio recording / reproducing apparatus having a D / A converter which takes in a digital stereo signal generated from a recording medium, converts it into an analog signal, and outputs it. A system control unit which adds a mixing circuit for selecting and mixing the audio signals applied from the audio signal, a control signal for controlling mixing with the audio signal reproduced by the mixing circuit, and a system control unit applied to the mixing circuit when the audio signal is introduced from the outside. It characterized in that it comprises a mute circuit for mixing and outputting the audio signal introduced from the outside to the stereo signal introduced by muting the control signal.

Description

Sound synthesis circuit

As this is a public information case, the full text was not included.

1 is a circuit diagram showing an embodiment of a sound synthesis circuit according to the present invention.

Claims (4)

An audio recording and reproducing apparatus having a digital / analog converter for converting a reproduced digital stereo signal into an analog stereo signal, comprising: first and second input terminals for introducing an analog stereo signal output from the digital / analog converter; A third input terminal into which a mono signal including a reproduced voice signal is introduced, a fourth input terminal for introducing a voice signal from an external means, and a stereo signal flowing into the first and second input terminals Mixing means for selecting and mixing the audio signals flowing into the third and fourth input terminals, and mixing the audio signals flowing into the third input terminals with the stereo signals flowing into the first and second input terminals. System control means for adding a control signal to the mixing means, and the system when a voice signal is introduced into the fourth input terminal from the outside. Muting means for mixing and outputting the audio signal flowing into the fourth input terminal to the stereo signal flowing into the first and second input terminals by muting the control signal applied from the fishing means to the mixing means; And a first and second input terminals for outputting a stereo signal including a voice signal output from the. The voice detection means of claim 1, further comprising a voice detection means connected to a fourth input terminal through which the voice signal is introduced from the outside and detecting a voice signal flowing into the fourth input terminal and applying a control signal to the mute means. Sound synthesis circuit further comprising. The method of claim 2, wherein the control signal output from the voice detection means is applied to the mixing means so that the audio signal introduced into the fourth input terminal mixes and outputs the stereo signal introduced into the first and second input terminals. Sound synthesis circuit characterized in. 4. The sound synthesis circuit according to claim 3, wherein the band pass filter filters only a portion of the mono signal introduced into the third input terminal to carry the voice signal. ※ Note: The disclosure is based on the initial application.