G - Physics – 11 – B
Patent
G - Physics
11
B
352/10.5, 352/20
G11B 5/03 (2006.01) G11B 5/86 (2006.01)
Patent
CA 1211555
STABILIZED BIAS SYSTEM FOR MAGNETIC TAPE READ AND WRITE HEADS ABSTRACT OF THE DISCLOSURE A bias system for high speed tape recorders, typi- cally comprising a master reproducer and several slave re- corders with each slave recorder having four recording amplifiers for driving the four heads of a four-track re- corder. The master reproducer includes a high frequency oscillator with an amplitude control, a stable dc source with an amplitude control, and a summing network for com- bining the ac and dc signals to produce a master control signal for each of the slave recorders. Each slave recorder includes a separator for receiving the master control signal and producing a dc signal and a high frequency ac signal. The dc signal is connected to each recorder amplifier for controlling the amplitude of the ac bias to the head. The ac signal is used to synchronize the high frequency bias ac from the bias generator, which is combined with the audio information signal at each recorder amplifier and then con- nected to the record head. Preferably each recorder ampli- fier is also provided with an independent amplitude control for matching the recorder amplifier to the particular record head.
440130
Cetec Corporation
Macrae & Co.
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