Accession Number : ADD005562

Title :   Time Division Digital Multiplexer Apparatus.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Stout,James E

Report Date : 17 Oct 1978

Pagination or Media Count : 6

Abstract : A synchronous time division digital multiplexer apparatus utilizing frequency shift keying to transmit data from a plurality of parallel input channels that are sequentially sampled and converted to serial data having non-return to zero (NRZ) characteristics. Frequency shift keying is used to modulate the obtained serial data with a sinusoidal audio carrier. Simultaneously, the system clock is automatically modulated by means of frequency shift keying with another sinusoidal audio carrier, or manually by a repetitive frame synchronization pulse. The data carrier and clock carrier are linearly combined, bandpass filtered, and level adjusted for over a voice grade transmission media. (Author)

Descriptors :   *Patents, *Time division multiplexing, Frequency shift keyers, Clocks

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE