| 摘要 |
A PCM signal processing apparatus adapted to receive successive transmission blocks, each of which comprise time-interleaved PCM data, error correction and error detection words, and which comprises a detecting circuit responsive to error detecting words for detecting if a received transmission block contains an error, error identifying means for identifying as erroneous each of the time-interleaved words included in the received transmission block which has been detected as containing an error, de-interleaving means for time-deinterleaving each received transmission block to recover a de-interleaved block which comprises de-interleaved PCM and error-correction words. An error compensating device is responsive to the identification by the error identifying device for compensating at least the erroneous PCM word in the de-interleaved block with a substitute PCM word when the error syndrome indicates the presence of an erroneous PCM word and the error correction device cannot detect the error or the location of the erroneous word is unknown. An inhibit device for inhibiting the error compensating device during the state when the location of the erroneous word is unknown follows a predetermined number of blocks, and slew rate control device or filter device is coupled to the de-interleaving device for passing the de-interleaved PCM word at a predetermined slew rate, and switching device is responsive to the output of the inhibit device and for selecting the slew rate of the control device or the filter device. |
