Communication device with zero-crossing demodulator

Details Communication device with zero-crossing demodulator Communication device with zero-crossing demodulator

1994-08-15

1995-11-21

Grimm, Siegfried H.

Demodulators

Frequency shift keying or minimum shift keying demodulator

Input signal combined with local oscillator or carrier...

329306, 329323, 329346, 375340, H04L 2714

Patent

active

054691125

ABSTRACT:
A communication device (100) includes mixers (104) and (108) which mix a local oscillator (112, 106) with a received signal to produce in-phase (i) and quadrature (q) components. The direction of the phase of the signal is detected as it crosses the i and q axes. The direction of the phase rotation is kept track of by a bi-directional counter (123) in order to demodulate multi-level digital signals. A positive rotation increments the bi-directional counter (123). Conversely, a negative direction decrements the counter (123). The final count of the counter (123) is used by a decision device 124 to establish the content of the received information signal.

REFERENCES:
patent: 4254503 (1981-03-01), Vance
patent: 4605903 (1986-08-01), Ihle
patent: 4752742 (1988-06-01), Akaiwa
patent: 5202643 (1993-04-01), Sato
IEEE Transactions on Communication Technology, vol. Com-18, No. 2, Apr. 1970, pp. 110-118.

Affiliated with

Also associated with

Rating

Communication device with zero-crossing demodulator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Communication device with zero-crossing demodulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Communication device with zero-crossing demodulator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1140402