Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-12-11
1988-05-31
George, Keith E.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358198, 3581941, H04N 560, H04N 710
Patent
active
047485019
ABSTRACT:
A cable converter for a television signal transmission having a stereo audio signal includes a coaxial output jack supplied with a 4.5 MHz aural intercarrier and a DC voltage for volume control and mute purposes. An interface circuit includes a pair of transistors connected in series for controlling the DC voltage level on the output jack as a function of desired volume level. One of the two transistors functions as a switch that may be operated from the cable head-end to provide a mute voltage level at the output jack for disabling the audio for nonauthorized channels. Optionally, a head-end control signal may operate another transistor for preventing coupling of the 4.5 Mhz aural intercarrier to the output jack.
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George Keith E.
Zenith Electronics Corporation
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