Abstract: A system for processing audio and video components of a television signal provides for automatic control of closed caption signal display in response to the status of an audio muting feature. The system includes an operating mode in which enabling audio muting also enables the closed caption display and disabling muting disables generation of the closed caption display.

Abstract: A channel number data entry system for a television receiver employing a numeric keyboard allows the selection of cable channels having channel numbers greater than 99, without the use of a separate ENTER or 100s key. Specifically, if a predetermined unused or invalid channel number, such as 00, is entered, then the on-screen display message 1.sub.-- is generated, and a three digit channel entry mode is enabled. If a valid and used two digit channel number is entered, then a two digit channel entry mode is enabled. In both modes, the desired channel is tuned upon receipt of the final digit of the channel number.

Abstract: A receiver includes a video switch operated by a controller for selecting antenna or auxiliary (baseband) video signals for display. When placed in a "VCR" operating mode the controller first selects the auxiliary input for display. If a video signal is not present at the auxiliary input the controller causes the switch to select the output of a tuner thereby providing an automatic signal search to locate the VCR signal which may be applied to either of the antenna and auxiliary inputs. An extension of the search includes tuning the tuner to channel 3 and, if no signal is found, tuning the tuner to channel 4. Upon failure to find an active video signal on either channel the tuner is returned to the last channel received prior to selecting the VCR mode of operation thereby releaving the user of both mode selection and channel selection requirements for locating the VCR signal.

Abstract: A television receiver cable of tuning either "air" channels in an "air" tuning mode or "cable" channels in a "cable" tuning mode includes apparatus for automatically selecting the tuning mode. The auto-tuning mode apparatus operates in conjunction with apparatus for automatically programming a memory for storing tuning information for tunable channels. When the auto-programming mode is selected, the receiver is caused to operate in the cable tuning mode and a search is conducted for active cable channels. If a predetermined number of active cable channels is located, the receiver remains in the cable tuning mode and the memory is programmed with tuning information for all of the cable channels. If the predetermined number of cable channels is not located, the receiver is caused to operate in the air tuning mode and the memory is programmed with tuning information for all of the air channels.