| 摘要 |
PURPOSE:To reduce a negative peak existing in a thin film head reproduction waveform remarkably by attenuating an input approximated waveform advanced or delayed relatively to an input signal by a prescribed time only by a prescribed quantity and adding the result to the input signal after the half wave width by a low pass filter. CONSTITUTION:The titled circuit consists of an attenuator 5 attenuating a signal amplitude at an input terminal of a delay line 1, a low pass filter 6 and an adder 4 adding an output signal of a delay line 2 to an output signal of the low pass filter 6. In selecting the constant such as a cutoff frequency of the low pass filter 6 properly, half value widths Tw1,Tw2 of the output signal S3 of the low pass filter 6 are set larger than the half value width Tw of a main signal S2 to be approximated to the half value width of negative peaks P1, P2. The attenuation of the attenuator 5 is selected so that the amplitude of the output signal S3 of the low pass filter 6 is approximated to the amplitude of the negative peaks P1, P2 of the main signal S2. In an output signal S4 being the addition of the obtained output signal S3 and the main signal S2, the negative peaks P1, P2 are not almost in existence.
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