Method of improving television signal-to-noise ratio

Details Method of improving television signal-to-noise ratio Method of improving television signal-to-noise ratio

1984-06-04

1986-05-06

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, 358186, H04N 514, H04N 5213, H04N 538

Patent

active

045875600

ABSTRACT:
The output signal of a television pickup tube is caused to appear in a carrier frequency range above the video frequency baseband without the interposition of preliminary baseband transmission. This is done by modulation at carrier frequency by any of a variety of methods that chops or modulates the signal as it is formed, at a frequency which should be in the neighborhood of 16 MHz for a video bandwidth of 5 MHz. The modulation may be done by breaking up the picture on the pickup electrode by an optical grid or similarly interposing a grid which interrupts the scanning beam that scans the electrode, in which cases the modulating frequency is related to the scanning rate. Electronic modulation of the beam can also be applied to a suitable part of the electron gun structure or to a special modulating control electrode. Operating the preamplifier in the carrier frequency range, with the transistor stage preceeded and followed by bandpass filters makes it possible to use transistors having a large amount of noise of a kind that diminishes with increasing frequency, after which the signal can be brought back to baseband for further processing by means of a demodulator.

REFERENCES:
patent: 2055593 (1936-09-01), Reynolds
patent: 2293899 (1942-08-01), Hanson
patent: 4104679 (1978-08-01), Kitamura et al.

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