| 摘要 |
An input signal and a variable amplitude AC bias signal are applied to a recording head (2) in a magnetic medium recorder. The AC bias generator (6) is controlled in response to the output of a frequency selective circuit (10) representing the total active bias signal applied to the recording head (2), the total active bias signal including the AC bias signal and the high frequency portion of the input signal, and the bias signal amplitude is thus so controlled that the total active bias signal applied to the record head (2) is dynamically maintained at an optimized value. A feed back circuit responds to the output of the circuit (10) for control of the variable amplitude AC bias generator (6).
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