Multiplexing arrangement for a television signal processing system
AssigneeRCA Corporation
InventorsAlvin R. Balaban, Steven A. Steckler
Life of this patent
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Abstract
A channel number display arrangement for a television receiver includes a multiplexer for alternately coupling binary signals representing the tens and units digits of the channel number of a selected channel to a single decoder and driver arrangement. To reduce visible effects of switching transients, the switching operation of the multiplexer is synchronized with respect to the receiver's deflection signals so that switching transients occur during horizontal retrace intervals in which the receiver's electron beams are normally blanked. In addition, keyed AGC circuitry, normally activated during the horizontal retrace intervals, is inhibited during the switching operation so that it is not erroneously set up in response to switching transients.
Claims10
In a television receiver including signal processing means for generating a video signal including picture and synchronization signal components, deflection means responsive to said synchronization signal components for generating horizontal and vertical deflection signals including horizontal trace and retrace intervals and vertical trace and retrace intervals for controlling the deflection of at least one electron beam and horizontal and vertical blanking pulses in substantial synchronization with said horizontal and vertical retrace intervals, respectively, said signal processing means including blanking means for inhibiting the generation of said electron beam in response to said horizontal and vertical blanking pulses, apparatus comprising:
- information generating means for generating at least first and second groups of binary signals representing first and second information components;
- conversion means for converting said first and second groups of binary signals when received to first and second groups of display control signals, respectively;
- first and second display means for displaying first and second symbols related to said first and second information components, respectively, in response to said first and second groups of display control signals, respectively, when enabled;
- and
- switching means coupled to said deflection means for generating a multiplexing signal having pulses with transitions occurring during selected ones of said blanking pulses of one of said horizontal and vertical deflection signals;
- and
- multiplexing means for periodically coupling said first and second groups of binary signals to said conversion means and respectively enabling said first and second display means to respond to said first and second groups of display control signals, respectively, in response to pulses of said multiplexing signal.
Dependencies are inferred from the claim text.