Resampling synchronizer of digitally sampled signals

Details Resampling synchronizer of digitally sampled signals Resampling synchronizer of digitally sampled signals

1993-02-26

1996-04-30

Chin, Stephen

Pulse or digital communications

Synchronizers

327 14, 327 45, 341 61, 341102, H04L 700

Patent

active

055132090

ABSTRACT:
A digital resampling system is provided for converting a first digital signal to a second digital signal, where both signals represent the same analog signal but sampled at two different clock rates which are not phase-locked together. A filter is clocked by the first clock and outputs filtered samples at the first clock rate, optionally omitting samples which will not be used. A phase indicator determines the relative phase position of the first and second clocks and indicates an integer phase value and a fractional phase value which together indicate where a tick of the second clock falls among the ticks of the first clock. The integer phase value identifies a clock cycle of the first clock in which a tick of the second clock occurs, and the fractional phase value represents a fraction identifying a position of the tick of the second clock within the clock cycle of the first clock. A sample selector selects M filtered samples from those provided by the non-decimating filter based on the integer phase value. A weight generator generates M weights based on the fractional phase value, and a weight averager weights the M filtered samples by the M weights, and outputs a sum or an average of the weighted samples. The resampler is applicable to digital-to-digital resampling, as well as resampling in an analog-to-digital or digital-to-analog conversion system.

REFERENCES:
patent: 4281318 (1981-07-01), Candy et al.
patent: 4755794 (1988-07-01), Candy
patent: 5126737 (1992-06-01), Torii
patent: 5225787 (1993-07-01), Therssen
Chu, S., et al., "Multirate Filter Designs Using Comb Filters", IEEE Transactions on Circuits and Systems, vol. Cas.-31, No. 11, pp. 913-924, Nov. 1984.
Franks, L. E., "Carrier and Bit Synchronization in Data Communication--A Tutorial Review", IEEE Transactions on Communications, vol. Com-28, No. 8, Aug. 1980.
Gitlin, R., et al., "Center-Tap Tracking Algorithms for Timing Recovery", AT&T Technical Journal, vol. 66, Issue 6, Nov./Dec. 1987.

Affiliated with

Also associated with

Rating

Resampling synchronizer of digitally sampled signals does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Resampling synchronizer of digitally sampled signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Resampling synchronizer of digitally sampled signals will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-635003