Pulse or digital communications – Synchronizers – Synchronizing the sampling time of digital data
Patent
1997-10-03
1999-11-23
Chin, Stephen
Pulse or digital communications
Synchronizers
Synchronizing the sampling time of digital data
375346, 375348, 375365, H04L 700
Patent
active
059913495
ABSTRACT:
A data processing device that can eliminate interference symbol interference (ISI) of a transmitted data through a timing recovery circuit and ferret out a correct sampling time. It includes an analog-digital converter, a timing recovery device and a sync-word matching filter. The analog-digital converter is used for receiving an analog signal, sampling the analog signal at a sampling frequency, generating a series of sample values, and converting these sample values to a digital signal having a main cursor component, a pre-cursor interference component, and a post-cursor interference component. The post-cursor interference component has a plurality of post-cursor channel response. The timing recovery device is used for eliminating the post-cursor interference component in accordance with the digital signal, while retaining the first post-cursor channel response, and the main cursor component and the pre-cursor interference component to generate an output signal. The sync-word match filter estimates a timing error according to the output signal and adjusts the sampling frequency for optimization.
REFERENCES:
patent: 3651316 (1972-03-01), Gibson
patent: 4494242 (1985-01-01), Ehrenbard et al.
patent: 5095497 (1992-03-01), Aman et al.
patent: 5513214 (1996-04-01), Gozzo
patent: 5517527 (1996-05-01), Yu
patent: 5724397 (1998-03-01), Torsti
Chin Stephen
Fan Chieh M.
Winbond Electronics Corp.
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