Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1990-12-20
1992-09-22
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
381 31, H04B 166
Patent
active
051503875
ABSTRACT:
In a transmitter in the present invention, an input signal is input to a QMF bank 102 where the input signal is divided to a plurality of frequency bands to form corresponding band signals. A distributed bit calculating unit 109 calculates respective bit rates with which the corresponding band signals are encoded on the respective power values of the band signals. Quantizers 104-1, 104-2, . . . , 104-n encode the respective band signals at the corresponding bit rates and input the resulting corresponding band codes to a multiplexer unit 111 which incorporates the respective band codes into a cell as an information unit and sends the cell. In a receiver, a cell is decomposed to obtain the respective band codes, which are then dequantized to form the corresponding band signals. These band signals are synthesized to form a signal for the entire band, and the signal for the entire band is output as a decoded signal.
REFERENCES:
patent: 4464782 (1984-08-01), Beraud et al.
patent: 4535472 (1985-08-01), Tomcik
patent: 4790015 (1988-12-01), Callens et al.
patent: 4805193 (1989-02-01), Mclaughlin et al.
patent: 4899384 (1990-02-01), Crouse et al.
patent: 4907277 (1990-03-01), Callens et al.
Akamine Masami
Miseki Kimio
Yoshikawa Hidetaka
Kabushiki Kaisha Toshiba
Safourek Benedict V.
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