Magnetic data recorder circuit and method of operating magnetic data recorders.

摘要

A magnetic recorder circuit includes a high pass filter (12) for producing a short duration data pulse (12A) for each transition (11A) of a data bit stream. Such short duration pulses (12A) are recorded simultaneously with an AC bias signal (21) on a magnetic record medium (17) which preferably has a low frequency control signal (18) hard recorded therein. A single gap transducer (14) simultaneously senses the control signal (18) and records the short duration data pulses (12A) in synchronism with the control signal. The data bit stream is reproduced from the recorded data pulses by passing the output of the transducer (14) via an equalizer circuit (26) to a DC restoring detector (27, 28) which is synchronised by the prerecorded control signal (18) and which continuously adapts its operation to readback signal amplitude variations. The recording and reproducing circuits are preferably formed as integrated circuits and mounted on an arm supporting the transducer (14) in order to keep lead lengths to a minimum.