Abstract: The radio transmission circuit comprises 16 antenna elements in a broadside array. A carrier wave is routed to the 16 elements and the phase to each element is adjusted to direct the transmitted wavefront toward a selected receive point. Prior to transmission, however, the carrier to each element is independently modulated by a two-state (0/&pgr;) phase shifter. Each of the 16 carriers is modulated with the first 16 orthogonal Walsh waveforms (a digital counterpart of the Fourier Transform). The output power levels at all antennas are equal, only the phase of the RF carriers change. Depending upon the sign conditions (inverted or noninverted) for the various 16 modulation waveforms, a pulse position modulation (PPM) signal is transmitted in which the pulse can occupy one of 16 time positions.

Abstract: An auxiliary circuit for remote control of television receiver blanking (audio and video) by digital code words transmitted as part of the video signal. The circuit detects and decodes the transmitted code and depending upon the code received, blanks either or both the audio and video signals in the receiver. A selector switch would be interconnected with the digital decoder to permit selection of particular code words which will cause the circuit to blank. The selector switch will normally be available for the television viewer to control. The transmitter for transmitting the digital code in the preferred configuration would comply with FCC Rules and Regulations specifying program related ASCII transmissions on line 21 of picture field 1.