Synchrodyning apparatus

Details Synchrodyning apparatus Synchrodyning apparatus

2005-09-15

2009-02-17

Tse, Young T. (Department: 2611)

Pulse or digital communications

Receivers

Amplitude modulation

C375S332000, C329S304000, C329S347000

Reexamination Certificate

active

07492835

ABSTRACT:
Synchrodyning apparatus in which a PAM IF signal is mixed with unmodulated carriers nominally at the frequency of the carrier, which unmodulated carriers are in quadrature with respect to each other. E.g., the PAM IF signal may be an intermediate-frequency 8VSB digital television signal. The baseband signals resulting from the mixing procedures are additively combined and differentially combined to generate real and imaginary components of a complex baseband signal. The real component of the complex baseband signal is processed for reproducing the digital signal used to modulate the transmitted RF carrier. An automatic frequency and phase control (AFPC) signal for controlling the oscillator circuitry generating the unmodulated carriers is generated by an AFPC detector responding to the imaginary component of the complex baseband signal or to both components of the complex baseband signal. Various combinations of the synchrodyning apparatus with channel-equalization and echo-suppression filtering are described.

REFERENCES:
patent: 6512555 (2003-01-01), Patel et al.
patent: 6643334 (2003-11-01), Limberg
patent: 2003/0072393 (2003-04-01), Gu
patent: 2004/0121738 (2004-06-01), Ide

Affiliated with

Also associated with

Rating

Synchrodyning apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Synchrodyning apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synchrodyning apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4066735