Digital signal processing apparatus for converting a digital sig

Details Digital signal processing apparatus for converting a digital sig Digital signal processing apparatus for converting a digital sig

1993-02-23

1995-03-21

Logan, Sharon D.

Coded data generation or conversion

Digital code to digital code converters

Data rate conversion

341141, 341106, H03M 742, H03M 500

Patent

active

054000246

ABSTRACT:
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.

REFERENCES:
patent: 3860908 (1975-01-01), Stratton, III
patent: 4536745 (1985-08-01), Yamaguchi et al.
patent: 4628297 (1986-12-01), Mita et al.
patent: 4804959 (1989-02-01), Makansi et al.
patent: 5119093 (1992-06-01), Vogt et al.
"Design Concept of Speech Processing Equipment for Digital Land Mobile Communication System", 2-411 of National Conference of IECE, Spring 1991.

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