Inventors:
Barrett P. Bingaman - Burbank CA
Assignee:
Cetec Corporation - El Monte CA
International Classification:
G11B 586
G11B 547
Abstract:
A bias system for high speed tape recorders, typically comprising a master reproducer and several slave recorders with each slave recorder having four recording amplifiers for driving the four heads of a four-track recorder. 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 combining 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 connected to the record head. Preferably each recorder amplifier is also provided with an independent amplitude control for matching the recorder amplifier to the particular record head.