Abstract: A method and an apparatus for controlling a selected electrical use circuit (9) from among a multiplicity thereof from a correspondingly selected electrical control circuit (8) from among the same multiplicity thereof. Two pulse operating plural-phase clocks (A & B) have mutually prime factors for the number of phases of each, such as five and six. These feed clock pulses (10,+) to each of the use and the control circuits. In each use and each control circuit all phases of the clocks are shifted one phase. One control circuit thereby uniquely actuates only one use circuit. Plural separate functions can be selectively energized at any use circuit.

Abstract: A ten second interval of audio frequency information is sampled, digitized, and stored in a memory. It is then read out of the memory very many times faster, say 400 times faster, converted to analog, combined with television synchronizing signals and transmitted as a signal television frame. That signal is received, converted from analog to digital, stored at high speed, and then read out at an audio frequency rate, to thereby recover the original ten seconds of audio frequency information.

Abstract: Digital data information is transmitted during at least one whole frame in television format, for the display of a television frame of alpha-numeric characters. The digital information is fitted to television lines with check bits at the end of each line. Successive fields of a frame carry the same digital information for redundant verification of accuracy. Microprocessors control processing of the information at both transmitting and receiving locations, coactively with memories. An identification code is provided for each frame.

Abstract: A visual service that employs the full facilities of a television communication channel on an intermittent basis. A user chooses certain still picture television frames that contain subject matter of interest to him, and conveys these choices to a central transmitting facility. These are then contiguously assembled for transmission to the user, perhaps with frames of other users as well, in a "burst" of such video frames.These frames are stored at the user's location, and can be brought up for viewing as often as desired. A vertical interval code may be used in the system for frame identification and to reproduce only what the user has chosen.