Modulation of transmission data signal in sychronous with transm

Details Modulation of transmission data signal in sychronous with transm Modulation of transmission data signal in sychronous with transm

1997-08-28

1998-11-17

Mis, David

Modulators

Frequency shift keying modulator or minimum shift keying...

Including logic element

375305, H03C 300, H04L 2712

Patent

active

058382089

ABSTRACT:
In a modulating system, a converting unit generates first and second quadrature signals based on a transmission data signal in synchronous with a transmission clock signal. First and second filters perform band limitation to the first and second quadrature signals to generate first and second band-limited quadrature signals. An oscillator generates a sine wave signal and a phase shifter phase-shifts the sine wave signal from the oscillator to generate first and second phase-shifted sine wave signals. A phase difference between them is .pi./2, and the first phased-shifted sine wave signal precedes the second phased-shifted sine wave signal in the phase. First and second multipliers multiply the first and second phase-shifted sine wave signals by the first and second band-limited quadrature signals to generate first and second multiplied signals, respectively. An adder synthesizes the first and second multiplied signals to generate an synthesis signal. Then, a limiter for limiting an amplitude of the synthesis signal to a predetermined level.

REFERENCES:
patent: 3845412 (1974-10-01), Rearwin et al.
patent: 3973201 (1976-08-01), Andren
patent: 4656646 (1987-04-01), Ryan
patent: 4897620 (1990-01-01), Paradise
patent: 5036296 (1991-07-01), Yoshida
patent: 5459762 (1995-10-01), Wang et al.
By Murano and Unagami, "Digital Signal Processing in Information Transmission", Published from Shokodo, Nov. 1987, pp. 20-29.

Affiliated with

Also associated with

Rating

Modulation of transmission data signal in sychronous with transm does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Modulation of transmission data signal in sychronous with transm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modulation of transmission data signal in sychronous with transm will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-888083