Timing recovery for variable bit-rate video on asynchronous tran

Details Timing recovery for variable bit-rate video on asynchronous tran Timing recovery for variable bit-rate video on asynchronous tran

1996-01-22

1997-09-16

Chin, Wellington

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

370516, 348500, H04J 306, H04L 7027, H04L 7033

Patent

active

056688415

ABSTRACT:
The problems associated with slow timing recovery in an ATM receiver are overcome by detecting the transmission rate of a received bit stream and periodically detecting the transmitted Enc.sub.-- CR values, which are used to calculate additional estimated clock reference (Est.sub.-- CR) values between the actual transmitted Enc.sub.-- CR values. The Est.sub.-- CR values are then used along with the actually received Enc.sub.-- CR values to generate a phase locked loop (PLL) error signal (TC.sub.-- ERROR), wherein the PLL is caused to converge more rapidly. In one embodiment, the TC.sub.-- ERROR values are generated for each received cell or packet instead of only for each received Enc.sub.-- CR value and, consequently, timing recovery is significantly speeded up. Additionally, the Est.sub.-- CR values can be adjusted to minimize the effects of lost cells, as well as, drift in the transmission rate.

REFERENCES:
patent: 4961188 (1990-10-01), Lau
patent: 5159447 (1992-10-01), Haskell et al.
patent: 5260978 (1993-11-01), Fleischer et al.
patent: 5287182 (1994-02-01), Haskell et al.
Vokil, F. "On Source Timing Recovery for Circuit Emulation in ATM Networks" IEEE 1989 pp. 1820-1827 vol. 3 of 3, GLOBECOM '89.
Ahmed K.M. "ATM Circuit Emulation--A Comparison of Recent Tech's" IEEE, 1991 pp. 370-374 vol. 1 of 3, GLOBECOM '91.
Lau, Fleischer "Synchronous Techniques for Timing Recovery in BISON" IEEE 1992 pp. 814-820 vol. 2 of 3, GLOBECOM '92.
Haskel, Reibman "Variable Bit Rate Video Coding for ATM & Broadcast Applics" IEEE 1993 pp. 114-116 vol. 1 of 5, ICASSP-93.

Affiliated with

Also associated with

Rating

Timing recovery for variable bit-rate video on asynchronous tran does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Timing recovery for variable bit-rate video on asynchronous tran, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Timing recovery for variable bit-rate video on asynchronous tran will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-223860