DISC EQUIPMENT-RECORDING CHARACTERISTICS
Magnetic recording heads are normally used for cutting discs ; the stylus is attached either to the moving iron armature or to the moving coil. The velocity at which the stylus vibrates (measured as the stylus passes its equilibrium position) is directly proportional to the recording-signal strength, so that, for a constant voltage, the velocity is constant, and the amplitude or width of the groove is inversely proportional to the signal frequency. This is known as constant velocity recording.
If the amplitude at high frequencies is chosen to give an acceptable signal-to-noise ratio, then the amplitude at low frequencies will be excessive. Distortion will be high and too much space will be needed between ...
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