| 摘要 |
<p>A non-linear preemphasis-deemphasis system comprises nonlinear preemphasis and deemphasis circuits. The preemphasis circuit comprises a non-linear signal increaser (10) for increasing the amplitude of a signal component higher than a predetermined frequency of an original signal to a predetermined threshold level in accordance with the frequency, a first adder (14) for adding the output of the signal increaser (10) to the original signal, a non-linear signal decreaser (16) having a characteristic inverse to that of the nonlinear signal increaser (10), and a second adder (20) for adding the output of the signal decreaser (16) to the original signal. The nonlinear deemphasis circuit comprises a non-linear signal decreaser (30) having a characteristic inverse to that of the non-linear signal increaser (10) and serves to decrease the amplitude of the signal component higher than the predetermined frequency of the received signal to a predetermined threshold level in accordance with the frequency, and a subtracter (34a) for subtracting the output of the signal decreaser (30) from the received signal. <IMAGE></p> |
