Timing recovery device in a receiver circuit for modems

Details Timing recovery device in a receiver circuit for modems Timing recovery device in a receiver circuit for modems

1993-11-24

1996-05-14

Tse, Young T.

Pulse or digital communications

Equalizers

Automatic

375355, H04B 304, H04L 702

Patent

active

055175260

ABSTRACT:
A receiver circuit for audio frequency modems, comprising an input module (11) for receiving and sampling an analog input signal representing digital data, an adaptive equalizer (12, 14, 15) having a transversal filter (12) with a plurality of complex multiplier coefficients ordered relative to a usually central highest norm coefficient to generate symbols at a given symbol rate from the sampled analog signal, and a timing recovery device comprising devices (12, 16, 18, 19) responsive to displacement of at least one of the coefficients, relative to said central position, to control an oscillator (20) supplying a timing signal.

REFERENCES:
patent: 4334313 (1982-06-01), Gitlin et al.
patent: 4416015 (1983-11-01), Gitlin
patent: 4531220 (1985-07-01), Brie et al.
patent: 4815103 (1989-03-01), Cupo et al.
patent: 5278867 (1994-01-01), Sehier et al.
patent: 5283813 (1994-02-01), Shalvi et al.
AT & T Technical Journal, vol. 66, No. 6, Nov. 1987, New York, US, pp. 63-78, Gitlin and Meadors: "Center--tap tracking algorithms for timing recovery".

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