AUDIO CODING AND DECODING

摘要

A DECODING DEVICE (30A) COMPRISES A NARROW-BAND DECODING UNIT (31) OPERABLE TO REPRODUCE A PCM SIGNAL (P1) FROM A NARROW-BAND BIT STREAM INCLUDED IN A WIDE-BAND BIT STREAM (SO), A WIDE-BAND DECODING UNIT (32) OPERABLE TO REPRODUCE A PCM SIGNAL (P2) HAVING A FREQUENCY BAND WHICH IS WIDER THAN THAT OF THE PCM SIGNAL (P1) REPRODUCED BY THE NARROW-BAND DECODING UNIT (31) FROM THE NARROW-BAND BIT STREAM AND A BAND EXPANDING BIT STREAM INCLUDED IN THE WIDE BAND BIT STREAM (S0) AND A SELECTING UNIT (34) OPERABLE TO SELECT EITHER THE PCM SIGNAL (P1) REPRODUCED BY THE NARROW-BAND DECODING UNIT (31) OR THE PCM SIGNAL (P2) REPRODUCED BY THE WIDE-BAND DECODING UNIT (32), AND TO OUTPUT THE SELECTED SOUND DIGITAL SIGNAL.(FIG 3)