Non-program signal acquisition system for a television signal receiver
AssigneeZenith Electronics Corporation
InventorMichael E. Long
Life of this patent
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Abstract
A television signal receiving apparatus with a channel tuner, such as a television, VCR, or cable box has circuitry for extracting nonprogram type information such as may be carried in the vertical blanking interval of a broadcast signal. In order to ensure a reliable signal source for the nonprogram type information the apparatus has a controller for setting the channel tuner to the proper channel and selecting the proper signal source to receive the nonprogram type information when the apparatus is not used for receiving regular programming signals selected by the viewer.
Claims7
In a television receiver apparatus having video processor circuitry for controlling a display medium to produce a display, multiple broadcast signal input sources, and a tuner for selecting broadcast channels from among the multiple input sources for application to the video processor, the improvement comprising:
- a) means for detecting whether the video processor circuitry is active or inactive;
- b) means for selecting a predetermined input signal source if the video processor circuitry is inactive;
- c) means for selecting a predetermined tuner channel setting if the video processor circuitry is inactive.
A television signal receiver comprising,
- a) an ON/OFF switch,
- b) a microprocessor for detecting the position of the ON/OFF switch,
- c) a tuner controllable by the microprocessor to select a broadcast channel carrying nonprogram information when the ON/OFF switch is in the OFF position,
- d) an input source switch having first and second input terminals and an output, the output connected to the tunner,
- the input source switch being controllable by the microprocessor to select the first input to pass to the output when the ON-OFF switch is in the OFF position, and to select the second input to pass to the output when the ON/OFF switch is in the ON position,
- whereby a reliable broadcast source of nonprogram information is automatically available to the television signal receiver when the receiver is turned off.
Dependencies are inferred from the claim text.