Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-04-05
1984-09-04
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
455109, H03C 128, H04B 104
Patent
active
044700687
ABSTRACT:
A television transmitter comprises a video processing circuit (2) an amplitude modulator (4) a vestigial sideband filter (8) an R.F. amplifying stage (9) and a klystron amplifier (10) which feeds an antenna (22). The klystron is provided with a grid electrode (12) to which a video signal is applied to modulate the density of the electron beam. The video signal applied to the grid electrode (12) is derived from the output of the video processing circuit (2) and fed via a low-pass filter (6) and a d.c. isolating circuit (20) to an amplifier (21) which provides a signal of the desired amplitude at the grid electrode (12). The filter (6) is arranged to restrict the bandwidth of the video signal applied to the grid electrode (12) to less than that of the vestigial sideband in order to reduce the possibility of re-inserting the higher frequencies into the vestigial sideband. The d.c. isolating circuit isolates the video signal source from the cathode and grid potentials of the klystron which are typically between 10 K and 30 K volts.
REFERENCES:
patent: 3473125 (1969-10-01), Babillon
patent: 3740649 (1973-06-01), Itoh
patent: 3955155 (1976-05-01), Behrend
patent: 4300237 (1981-11-01), Morgan
New Technique Reduces UHF TV Transmitter Power Consumption, by Anon, RCA Broadcast New, vol. 159, p. 44, Oct. 1976.
20 KW UHF Television Transmitter with all Solid State Driver for Klystron Amplifiers, by Irmer and Muller, Electrical Communication, vol. 48, No. 4, 1973, pp. 436-443.
Briody Thomas A.
Chin Tommy P.
Goodman Edward W.
Streeter William J.
U.S. Philips Corporation
LandOfFree
Television transmitter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Television transmitter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Television transmitter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1895118