Apparatus and methods for improving timing recovery of a system

Details Apparatus and methods for improving timing recovery of a system Apparatus and methods for improving timing recovery of a system

1994-02-15

1997-03-18

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

327159, 331 17, 375326, H03D 324

Patent

active

056129815

ABSTRACT:
Apparatus and methods for improving timing recovery of a system clock by causing its frequency to be within a specified tolerance range during a timing recovery acquisition period for the system clock. The apparatus includes a voltage controlled oscillator for producing the system clock and a non-volatile memory containing an offset value. The non-volatile memory provides an offset value (representing an offset voltage value) which assures that the voltage controlled oscillator receives a voltage value which causes the frequency of the system clock to be within a specified tolerance range. The apparatus may also include a write control unit for determining and updating the offset value for a next timing recovery acquisition period. The methods include steps for performing these operations.

REFERENCES:
patent: 4151485 (1979-04-01), Lafratta
patent: 4763342 (1988-08-01), Ambrosio et al.
patent: 5337335 (1994-08-01), Cloetens et al.
patent: 5381181 (1995-01-01), Deiss
patent: 5430485 (1995-07-01), Lankford et al.
patent: 5440259 (1995-08-01), Yokomura
patent: 5446767 (1995-08-01), Nakagawa et al.
patent: 5448598 (1995-09-01), Yousefi et al.
ISO-IEC by B. Haskell and A. Reibman "Timing Recovery of Variable Bit Rate Video on ATM Networks" in Jul. of 1992.

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