Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1992-08-20
1994-12-20
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
375 14, 370 321, 379411, H04L 700
Patent
active
053751477
ABSTRACT:
An impulse response of a litter may change in the output of a filter unit immediately after the generation of a litter according to a sampling timing signal from a timing regenerating unit if a filter unit is provided between an A/D converting unit and an echo canceler. In this case, a selecting unit in a jitter compensating unit compensates an uncanceled echo through each of the outputs sequentially selected by a plurality of adaptive filter unit. Plural sets of tap coefficients are stored in a tap coefficient storage unit, from which the selecting unit sequentially reads them to operate one adaptive filter unit, thereby reducing the size of a jitter compensating circuit.
REFERENCES:
patent: 4605826 (1986-08-01), Kanemasa
patent: 4868874 (1989-09-01), Takatori et al.
Awata Yutaka
Kakuishi Mitsuo
Koizumi Nobukazu
Chin Stephen
Fujitsu Limited
Phan Hai H.
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