| 摘要 |
A digital circuit transmission device which does not give speakers an incongruent feeling even when a voice codec is changed over in the same call for the purpose of making compatible efficient use with high quality of a circuit, and which comprises, both housed in an encoder, a first voice codec 7 having high quality and bit rate, and a second voice codec 8 having a low bit rate with not high quality, wherein these voice codecs are changed over based on control information that discriminates the traffic load of a bearer circuit 111 from an operation monitor/control unit 4. A silent portion of a voice signal input to a sound detector 31 in a signal detector 3 is searched to change over the voice codecs when it is detected.
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