Modulators – Miscellaneous
Patent
1991-09-06
1993-04-06
Grimm, Siegfried H.
Modulators
Miscellaneous
332151, 332168, 332177, 455 46, 455102, 455109, H03C 100
Patent
active
052007154
ABSTRACT:
A new method of modulating and demodulating signals and circuitry therefor is disclosed. The modulation circuit defines a non-linear voltage current transfer function wherein at low voltage levels the current voltage transfer function is substantially linear and at higher voltages, the transfer function is substantially exponential. The modulation circuit can be designed of three parallel branches, a resistive branch, and two diodes in the remaining branches, the anode of one diode being coupled to the cathode of the other diode. Demodulation circuitry is also disclosed that includes a circuit for determining the instantaneous phase and amplitude and then processing circuitry to decode the modulation information based upon the sampled phase and amplitude data.
REFERENCES:
patent: 2304135 (1942-12-01), Wise
patent: 4613974 (1986-09-01), Vokac et al.
Gerdes, Richard. "Using Genesys.TM. HDTV Technologies for Today's Expanded NTSC Service". Presented at 1990 Spring Engineering Conference, Nat'l Assoc. of Broadcasters, Apr. 1, 1990. Atlanta, Ga.
Gerdes, Richard. "Waveform Modulation as Used in Television Applications". Presented at RF Technology Expo 90, Mar. 28, 1990, Anaheim, Calif.
Gerdes, Richard. "Genesys.TM. HDTV Technologies Expand Existing NTSC Service". Presented at The 24th Annual SMPTE Television Conference, Society of Motion Picture and Television Engineers, Jan. 26, 1990, Lake Buena Vista, Fla.
Gerdes, Richard. "Arizona Based HDTV:; The Genesys.TM. Technologies". Presented at Phoenix Chapter of the Society of Broadcast Engineers, Arizona Broadcasters Association Fall Meeting, Nov. 10, 1989. Phoenix, Ariz.
Gerdes, Richard. "HDTV Management Timetable". Presented at Challenges in Teleproduction, The Internat'l Teleproduction Society Annual Forum, Sep. 17, 1989. Los Angeles, Calif.
Gerdes, Richard. "The Use of Genesys Technology for HDTV". Presented at the 130th SMPTE Technical Conference, Society of Motion Picture and Television Engineers, Inc., Oct. 15-19, 1988. New York, N.Y.
Gerdes Mary K.
Gerdes Richard C.
Grimm Siegfried H.
WavePhore, Inc.
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