| 摘要 |
PURPOSE:To decrease the opportunity of detecting residual sound as a signal in error even if an output signal of an amplitude equalization circuit is distorted by applying compensation of an input signal peak value to the output signal of a transversal filter. CONSTITUTION:The amplitude of output signals b1, b2 of the transversal filter FLT1 is detected respectively by using an output voltage C of a voltage generating circuit GEN4 with voltage comparator circuits CMP2 and CMP3 and a high level pulse signals g1, g2 are outputted by the time exceeding the output voltage C. The amplitude of input signals a1, a2 of the FLT1 is detected by an output voltage (j) of the GEN8 by CMP6, CMP7 and output signals h1, h2 of the CMP6 and CMP7 are produced similarly as above. An output signal l1 of an AND11 is a signal ANDing the output signal g1 of the CMP2 and an output signal k1 of a DL9 by means of the AND11, and an output signal l2 is similarly a signal ANDing the output signal g2 of the CMP3 and an output signal k2 of a DL10 by means of the AND12, and an output signal (m) of an OR5 is a detection signal. Thus, even if noise (c) is mixed, a pulse (f) is generated at the output g1 of the CMP2 and the pulse is eliminated in the detection signal (m). |
