Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-02-22
1984-02-28
Masinick, Michael A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358176, 358179, H04N 552
Patent
active
044344392
ABSTRACT:
An automatic gain control arrangement is provided for an analog to digital (A/D) converter in a television signal processing system. A gain-controlled source of analog signals applies a video information signal to the input of an A/D converter. The A/D converter produces digitized video signal samples at an output which is coupled to a digital peak detector. The digital peak detector detects the level of the digital samples of the synchronizing signal components. The detected sync signal level is compared with a desired value or range of values. If the detected sync signal level is not at the desired level or is outside the desired range, the count of a counter is incremented or decremented accordingly. The count of the counter is converted to an analog voltage which is applied to the gain-controlled signal source to control the level of the analog signal applied to the A/D converter. The analog voltage may also be combined with a control voltage produced by an analog peak detector, which detects the level of the input signal to the A/D converter, to produce a composite gain control signal.
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B. Grob, Basic Television-Principles and Servicing, First Edition, McGraw-Hill Book Co., 1949,pp. 252-257.
Balaban Alvin R.
Steckler Steven A.
Herrmann E. P.
Masinick Michael A.
Rasmussen P. J.
RCA Corporation
Whitacre E. M.
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