Quasi-parallel television if suitable for stereo sound reception

Details Quasi-parallel television if suitable for stereo sound reception Quasi-parallel television if suitable for stereo sound reception

1983-11-29

1987-04-21

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358197, H04N 562, H04N 560

Patent

active

046600884

ABSTRACT:
A multiplier for multiplying the modulated sound and picture carriers to produce an intercarrier sound signal in a quasi-parallel sound channel of an IF section has a pair of anti-parallel connected diodes in a limiter for generating an amplitude limited version of the picture carrier. It has been discovered that the varying capacitance of the diodes with picture amplitude can cause phase shifts and hence phase modulation interference in the intercarrier signal. The latter is especially troublesome for stereo sound reproduction. To reduce such interference, a low value resistor is shunt coupled to the diodes to inhibit the capacitance variations of the diodes and resulting undesired phase modulation in the intercarrier sound signal.

REFERENCES:
patent: 3796963 (1974-03-01), Balaban
patent: 4199786 (1980-04-01), Orii
patent: 4283792 (1981-08-01), Hongs et al.
Telefunken Service Manual for VR520/VRU620/920/1920 VR520SA/VR520 Ut Video Recorders, p. 48.
Schematic for SEL Digital Chassis IFB281, published Aug. 1983.
"Intercarrier Buzz Phenomena Analysis and Cures" by P. Fockens and C. G. Eilers appearing in IEEE Transactions on Consumer Electronics, vol. CE-27, No. 3, Aug. 1981.
Philips Application Note ET 17506, p. A2.
RCA Television Service Data, File 1972 CT5, pp. 21-24.

Affiliated with

Also associated with

Rating

Quasi-parallel television if suitable for stereo sound reception does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Quasi-parallel television if suitable for stereo sound reception, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quasi-parallel television if suitable for stereo sound reception will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-755516