EQUALIZING METHOD OF WAVEFORM

摘要

PURPOSE:To keep the reproduced signal at a high level, by producing the differential signals before and after the signal obtained by reproducing a digital signal and performing the subtraction and addition at the front and rear parts of the original waveform in order to give compensation to the peak shift of the reproduced waveform. CONSTITUTION:The signal 16 is obtained by giving a constant delay T110 to the digital reproduced signal 15 which is amplified up to a desired level. Then the signal 16 is applied to an adder/subtractor circuit 14. The signal 18 is obtained by giving a constant delay T212 again to the signal 16 with the differentiation 13. The signal 18 is applied to the circuit 14 for the subtraction. The signal 15 is differentiated 11 to obtain the signal 17 and applied to the circuit 14 for the subtraction. This is equivalent to the fact that the synthetic signal 19 is subtracted from the signal 16. As a result, the output 20 of the circuit 14 has the reduced spread at its bottom as shown in the figure to obtain a signal having a high waveheight. This signal is suitable for the recording/reproducing of high density.