Pulse or digital communications – Synchronizers – Self-synchronizing signal
Reexamination Certificate
2007-09-18
2007-09-18
Bayard, Emmanuel (Department: 2611)
Pulse or digital communications
Synchronizers
Self-synchronizing signal
Reexamination Certificate
active
10218361
ABSTRACT:
A communication system, source and destination ports of the communication system, and methodology is provided for transporting data in one of possibly three different ways. Data is transported across the network at a frame sample rate that can be the same as or different from the sample rate or master clock within the source port or the destination port. If the sample rate of the source port is known, the sample rate of the destination port can be created using a PLL within the destination port and simply employing a phase comparator in the source port. The phase comparator forwards the phase or frequency difference of the network transfer rate and the source sample rate to the destination port, which then generates a local clock equivalent to the source which then compiles audio data being played at the same rate in which it was sampled at the source. Where economically feasible, sample rate conversion can be used at the source. However, sample rate conversion at the destination is preferred if the source sample rate is forwarded across the network relative to the frame transfer rate of the synchronous network. The sample rate converter simply produces a play rate from the transmitted information at the destination. Again, however, sample rate conversion compares relative phase difference changes similar to the phase difference compared in the digital PLL mode. As a further alternative, sample rates within the source and destination ports can be derived from the network frame rate using fractional dividers in the source and destination ports.
REFERENCES:
patent: 5426643 (1995-06-01), Smolinske et al.
patent: 5875354 (1999-02-01), Charlton et al.
patent: 6151479 (2000-11-01), Kummer
patent: 6526325 (2003-02-01), Sussman et al.
patent: 2003/0063684 (2003-04-01), Czekaj et al.
patent: 0 841 767 (1998-05-01), None
patent: 0 912 004 (1999-04-01), None
patent: 1 130 833 (2001-09-01), None
Heck et al., Media Oriented Synchronous Transfer—A Network Protocol for High Quality, Low Cost Transfer of Synchronous, Asynchronous, and Control Data on Fiber Optic, 1997, pp. 1-15.
International Search Report, application No. PCT/US 03/25182, mailed Mar. 25, 2004.
Lau et al., “Synchronous Techniques for Timing Recovery in BISDN,” IEEE Transactions on Communications, vol. 43, No. 2-4, 1995, pp. 1810-1818.
Partial International Search Report, application No. PCT/US 03/25182, mailed Jan. 12, 2004.
“192 kHz Stereo Asynchronous Sample Rate Converter,” Analog Devices AD1896, © 2001, pp. 1-24.
Akkihal Shivanand I.
Knapp David J.
Winkelmann Matthias
Bayard Emmanuel
Daffer Kevin L.
Daffer McDaniel LLP
Standard Microsystems Corp.
LandOfFree
Communication system and method for generating slave clocks... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Communication system and method for generating slave clocks..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Communication system and method for generating slave clocks... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3750828