Sanyo Electric Co., Ltd.

Niro Imaoka

Masahiro Narita

Satoru Nishimura

Base station equipment of a digital mobile communication system includes a digital audio signal processing apparatus provided for each message channel for low bit rate coding and decoding a digital audio signal. Each digital audio signal processing apparatus includes a plurality of memories that store a plurality of low bit rate coding/decoding programs differing from each other to comply with different low bit rate coding/decoding methods. A system control circuit determines the low bit rate coding/decoding method of an applied digital signal for controlling a selector to select a memory that stores corresponding low bit rate coding/decoding program. As a result, the digital audio signal processing apparatus performs digital to digital conversion of the applied digital signal according to the low bit rate coding/decoding program stored in the selected memory.

Digital signal processing apparatus and a communication system using the

Base station equipment of a digital mobile communication system includes a digital audio signal processing apparatus provided for each message channel for low bit rate coding and decoding a digital audio signal. Each digital audio signal processing apparatus includes a plurality of memories that store a plurality of low bit rate coding/decoding programs differing from each other to comply with different low bit rate coding/decoding methods. A system control circuit determines the low bit rate coding/decoding method of an applied digital signal for controlling a selector to select a memory that stores the corresponding low bit rate coding/decoding program. As a result, the digital audio signal processing apparatus perform digital to digital conversion of the applied digital signal according to the low bit rate coding/decoding program stored in the selected memory.

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Gifu, Japan

Niro Imaoka