Digital modulator

Details Digital modulator Digital modulator

H - Electricity

04

L

354/97

H04L 27/24 (2006.01) H04L 27/20 (2006.01)

Patent

CA 1079859

Abstract of the Disclosure A modulator for differentially encoded phase-shift keyed digital data is implemented entirely by digital means. Baseband serial binary data are illustratively transformed into dibit pairs which are assigned discrete quaternary carrier-wave phase shifts. A "staircasing" shift register whose weighted outputs are combined to form a quantized phase-modulated carrier wave is advanced by a relatively high-speed counter through a frequency divider network. The division rate of the divider is selectively accelerated in each baud interval in accordance with the assigned dibit coding. The resultant quantized carrier wave is then low- pass filtered prior to application to a telephone trans- mission line. By controlling the division rate of the divider rather than the advancement rate of the shift register, gradual transitions are imparted to the output carrier wave with minimal harmonic distortion.

259047

Affiliated with

Also associated with

Rating

Digital modulator 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 modulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital modulator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-517435