Phase-locked loop coefficient generator for a filter arrangement

Details Phase-locked loop coefficient generator for a filter arrangement Phase-locked loop coefficient generator for a filter arrangement

1986-12-11

1989-01-10

Harkcom, Gary V.

Boots, shoes, and leggings

341123, G06F 738, H03H 1706

Patent

active

047978457

ABSTRACT:
In a sample rate converter having a non-rational conversion factor the input samples coincide with low-rate clock pulses and the output samples coincide with high-rate clock pulses, or inversely. It comprises a filter coefficient generator which, based on the distance (deviation) between a low-rate clock pulse and the immediately preceding or immediately subsequent high-rate clock pulse, continuously supplies a series of filter coefficients. To determine the deviation a phase-locked loop is provided, with a phase detector receiving the low-rate clock pulses as well as synthetic low-rate clock pulses and supplying a discrete-time phase difference signal which is applied to a processor circuit. This circuit supplies the desired deviation and a reference number which is applied to a counter circuit. This circuit also receives the high-rate clock pulses and each time after receiving the number of clock pulses corresponding to the reference number it supplies a synthetic low-rate clock pulse. In the processor circuit a filtering operation is first performed on the discrete-time phase difference signal so that control signal samples are obtained. An auxiliary sample is subtracted from such a control signal sample and the difference is divided by a weighting factor of the number P thus obtained those bits whose significance is less than 2.degree. represent the deviation, while the other bits represent the reference number. By subsequently multiplying the deviation by the weighting factor, a new auxiliary sample is obtained.

REFERENCES:
patent: 3829670 (1974-08-01), Kebabian
patent: 4020332 (1977-04-01), Crochiere et al.
patent: 4270026 (1981-05-01), Shenoi et al.
patent: 4460890 (1984-07-01), Busby
patent: 4584659 (1986-04-01), Stikvoort
patent: 4604720 (1986-08-01), Stikvoort

Affiliated with

Also associated with

Rating

Phase-locked loop coefficient generator for a filter arrangement does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Phase-locked loop coefficient generator for a filter arrangement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase-locked loop coefficient generator for a filter arrangement will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2112154