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):

Report Date:

1978-10-17

Pagination or Media Count:

6.0

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

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE