Karaoke converter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Audio equipment
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This simple device can be easily made by yourself. It allows you to replace the singer's voice with your own in any stereophonic phonogram by simple manipulations.
This device was developed after an unsuccessful attempt to repeat the same with the use of frequency filters was unsuccessful. In the proposed version, the principle of subtracting the signals of the channels of a stereophonic phonogram is used. In most cases of stage or studio performance, the singer's voice during recording is located in the center of the apparent sound source (PCS), i.e. the performer's voice is evenly and in-phase distributed in the right and left channels of the stereo recording. Therefore, if these signals are subtracted in some device, then the performer's voice can be "quenched" or significantly weakened.
Now, if you add your own voice signal to the difference signal from an additional variable output microphone amplifier, it will prevail in the KIZ, creating the full effect of a karaoke performance. The test results showed that the unit performs well enough to play most CDs.
The converter is made on three operational amplifiers. The signal of the left channel of the source (for example, from a CD player or from the line output of a tape recorder) is fed to the inverter, made on the DA1 chip, and from it to the input of the DA2 chip - signal adder. At the same input of the DA2 microcircuit, the signal of the right channel of the source without inversion and the signal from the output of the adjustable microphone amplifier, made on the DA3 microcircuit, were applied. The same signals of the right and left channels, one of which has the opposite phase (inverted), are subtracted, the rest are summed with the signal of the microphone amplifier and are transmitted from the output of the DA3 chip to the audio frequency power amplifier.
Almost any operational amplifier can be used in the converter, so the numbering of the input, output and power pins is not shown in the diagram. The microphone should be connected to the input of the device in accordance with the instructions for its operation.
Author: R.Bisinella
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