Pcm system reproducing device

Abstract

Abstract PURPOSE:To eliminate a DC component from an analog signal by detecting the DC component of the analog signal subjected to D/A conversion and feeding back this component into a digital signal to allow a proper processing in the stage of the digital signal before conversion to it. CONSTITUTION:The DC component is detected from an output of a buffer amplifier 8 at a DC component detecting circuit 9, A comparator 10 of the next stage detects the polarity of the said detected output. Then an up-down counter 11 is counted up or down in synchronization with the sampling frequency depending on the polarity of the said detected output and its count output is given to one input of a subtractor circuit 12. An output of a signal processing circuit 1 is given to the other input of the subtractor circuit 12. The subtractor circuit 12 subtracts an output of the counter 11 from the output of the signal processing circuit 1. The DC component generated in an output of the buffer amplifier 8 is eliminated through the said subtraction.

Inventors

• 👤 Koji Fukuhara
• 👤 福原　康二

Bibliographic Details