High-speed modem synchronized to a remote CODEC

Details High-speed modem synchronized to a remote CODEC High-speed modem synchronized to a remote CODEC

1992-10-20

1995-02-28

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

370103, 341144, 341145, 375350, 375354, 375356, H04B 138

Patent

active

053944372

ABSTRACT:
A modem that operates reliably at a symbol rate that corresponds to twice its bandwidth even when it is coupled to a receiving A/D converter that operates under control of a clock is realized by synchronizing the modem's operation to the A/D's clock. The superior operation of this modem advantageously extends to A/D clock frequencies beyond the frequency of twice the modem's bandwidth. To minimize quantization noise, the modem's output is conditioned to minimize intersymbol interference by adjusting the modem's output to the A/D converter's sampling times and slicing levels. When the A/D's clock is higher than twice the bandwidth of the modem's output signal, some intersymbol interference cannot be avoided. In accordance with this invention, the position and value of this interference is computed at the receiver and subtracted from the received signal.

REFERENCES:
patent: 4890303 (1989-12-01), Bader
patent: 5184347 (1993-02-01), Farwell et al.
patent: 5214637 (1993-05-01), Sridhar et al.
patent: 5261118 (1993-11-01), Vanderspool, II et al.
patent: 5268929 (1993-12-01), Hashimoto et al.

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