Pulse or digital communications – Transceivers – Modems
Reexamination Certificate
2007-09-11
2007-09-11
Vo, Don N. (Department: 2611)
Pulse or digital communications
Transceivers
Modems
C370S286000, C379S003000, C379S406050
Reexamination Certificate
active
11425712
ABSTRACT:
A hybrid circuit within a full-duplex transceiver transmits an outgoing signal outward on a communication channel at the same time it receives an incoming signal arriving via the communication channel, and the outgoing and incoming signals sum to form a combined signal. The hybrid circuit generates both the outgoing signal and a replica of the outgoing signal in response to an input signal, and then subtracts the replica from the combined signal in producing a received signal. The received signal includes a component derived from the incoming signal and a residual echo component having peaks resulting from a phase difference between the outgoing signal and its replica. The transceiver adjustably delays the input signal so that the residual echo component peaks occur at times other then when the received signal is being digitized, thereby minimizing the influence of the echo component peaks on the data sequence.
REFERENCES:
patent: 5596604 (1997-01-01), Cioffi et al.
patent: 5712848 (1998-01-01), Deutsch
patent: 5787113 (1998-07-01), Chow et al.
Kang Wen-Juh
Lin Chia-Liang
Hsu Winston
Realtek Semiconductor Corp.
Vo Don N.
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