Multiplex communications – Duplex – Transmit/receive interaction control
Patent
1996-08-05
1999-01-05
Patel, Ajit
Multiplex communications
Duplex
Transmit/receive interaction control
379410, H04B 323
Patent
active
058569707
ABSTRACT:
An echo canceller (500) utilizes a central control unit (502) (CCU) and at least one convolution processing unit (504) (CPU) to perform echo cancellation on one or more channels. A method for operating the echo canceller (500) controls reading (706) one or more reference signals (510) and reflected signals (512), convolution and adaptive processing (11, 21, 31, 41) using the CPUs (504), and post-processing (702) to produce one or more echo cancelled signals (514). Convolution and adaptive processing for multiple channels can be performed simultaneously (11, 31) by multiple CPUs (504), or in a time-multiplexed manner (11, 21) by a single CPU (504), or a combination (11, 21, 31, 41) of simultaneous and time-multiplexing by multiple CPUs (504). CCU (502) is able to perform processing functions (702-730) while CPUs (504) perform convolution and adaptive processing (11, 21, 31, 41).
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INSPEC abstract of Journal article: ECHO2, a multi-channel single-chip, VLSI-ECHO canceller with embedded TMS320C10 DSP by Prysby et al on pp. 100-13 in IEEE, New York, USA, Sep. 1993.
INSPEC abstract of Journal article: A microprocessor based adaptive digital echo canceller by McDevitt, E.J. in NTC '80. IEEE 1980 National Telecommunications Conference, p. 56. 4 1-4, IEEE, New York, USA, 1980.
Gee Donald Fong
Geren Bruce Edward
Piket James Brian
Yip William Chunhung
LeMoine Dana B.
Motorola Inc.
Patel Ajit
Rao Seema S.
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