Vocal Zapper


Posted on Jun 9, 2012

All vocal eliminators start with the assumption that the lead vocal in a recording is in the center of the stereo field - which means that it is equal amplitude and phase in both left and right channels. Subtracting one channel from the other removes this highly correlated signal while leaving the uncorrelated signals in the channels unchanged. Since kick drum and bass are often recorded at stereo center the time constant of C3 and R12 is chosen so that these signals are blocked from the non-inverting input so they pass to the final output without being zapped.


Vocal Zapper
Click here to download the full size of the above Circuit.

In the Vocal Zapper circuit one channel is subtracted from the other by applying them to the inverting and non-inverting inputs of opamp IC1. The Normal/Zap switch allows the vocal elimination function to be disabled by switching the J2 signal from the non-inverting opamp input (Zap) to the summing junction at the inverting input of the amp (Normal). Note that the output signal at J3 and J4 is mono in either Zap or Normal mode. IC2 is used as a mic preamp to boost the microphone signal level so that it's comparable to the program material and this high level signal is connected to the summing junction at the inverting input of IC1.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

LED Voltmeter
Signal Amplifier with 2N2222
FM Bug detector 80 - 150 MHz
Smoke-detector
Switch-debouncer
Programmable Identifier
35 Ampere Power Supply
IR Remote Control Repeater
avr programmer how to make
ultrasonic switch sensor
headphone jacks
Dtmf Generator At90s4414
Build A Byte Blaster Circuit
Four-Digit Keypad-Operated Switch



Top