Digital phase locked loop circuit for PCR recovery

Details Digital phase locked loop circuit for PCR recovery Digital phase locked loop circuit for PCR recovery

1998-09-18

2000-06-06

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, 370516, 375376, H03L 700

Patent

active

060723696

ABSTRACT:
Disclosed is a DPLL circuit including a PCR register receiving and storing PCR values; an LPCR counter counted by a system clock; an LPCR register fetching an LPCR value every PCR input cycle; a phase error detector determining a difference in values stored in the PCR and LPCR registers, and calculating a present phase error requiring compensation; an interpolator interpolating signals between phase error values; a gain calculator determining a difference between consecutive LPCR values, then calculating a gain value, a D/A converting portion multiplying values output from the interpolator and the gain calculator, then converting the resulting signals into analog signals; and a VCO generating system clock frequencies according to signal voltage output from the D/A converting portion. In another aspect, the DPLL circuit is used in MPEG2 systems. Here, the PCR register receives and stores PCR values, and the LPCR register fetches LPCR values, the PCR and LPCR values including a 9-bit extension and a 33-bit base, the base increasing by 1 every time the extension becomes 300. Further, the VCO generates frequencies in a predetermined range from 27 MHz according to signal voltage output from the D/A converting portion, and an STC circuit adds the difference in values between the PCR and the LPCR values to the LPCR base value, then outputs the resulting value.

REFERENCES:
patent: 5835668 (1998-11-01), Yanagihara

Affiliated with

Also associated with

Rating

Digital phase locked loop circuit for PCR recovery does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital phase locked loop circuit for PCR recovery, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital phase locked loop circuit for PCR recovery will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2216658