Abstract: A tuning system for use in radio frequency multi-signal receiving systems, e.g a CATV converter, utilizes a closed feedback loop digital arrangement for channel selection (local oscillator frequency control) and channel fine tuning. The system may be implemented either via discrete hardware or through the use of microprocessor controlled apparatus.

Abstract: A tuning system for use in a radio frequency multi-signal receiving system, e.g., for CATV converters, utilizes a closed feedback loop digital arrangement for channel selection (local oscillator frequency control) and channel fine tuning. The system may be implemented either via discrete hardware or through the use of microprocessor controlled apparatus.In accordance with one aspect of the present invention, double heterodyne tuning apparatus automatically compensates for frequency drift in the second local oscillator.

Abstract: An improved system arrangement for distributing and permitting use of an ensemble of program controlled television games includes head end apparatus for impressing an array of game-regulating programs onto an electronic distribution system, e.g., by time division multiplexing into an assigned frequency band on a television program distributing CATV or MATV cable. At any of plural receiver locations connected to the distribution channel, a user desiring a game selects ("tunes") the game frequency band and loads a game program memory (RAM) with the program for the particular game desired. The composite apparatus then functions in the now per se conventional manner to actually implement the selected game in conjunction with a television receiver and player control(s).