Accession Number : AD0450689

Title :   THE LINCOLN EXPERIMENTAL TERMINAL SIGNAL PROCESSING SYSTEM,

Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s) : Drouilhet, P. R., Jr. ; Lebow, I. L.

Report Date : 16 OCT 1964

Pagination or Media Count : 16

Abstract : The design of the Lincoln Experimental Terminal (LET) includes a digital signal processing system which is compatible with both dispersive and non-dispersive satellite communications media. It provides three data rates: 9600 bits/ sec, to accommodate a voice-excited vocoder with telephone quality inputs; 4800 bits/sec, to accommodate a pitch-excited vocoder with dynamic microphone input; and 200 bits/sec for teletype only. Both of the speech rates allow two multiplexed teletype channels. The basic modulation system combines frequency-hopped signals with sequential encoding and decoding. Antenna pointing, range and Doppler predictions, and data multiplexing and demultiplexing are performed using a Univac 1218 digital computer. (Author)

Descriptors :   *RADIO SIGNALS, DATA PROCESSING, DATA TRANSMISSION SYSTEMS, CODING, SPEECH TRANSMISSION, VOICE COMMUNICATIONS, ARTIFICIAL SATELLITES, MULTIPLEXING, TELETYPE SYSTEMS, RADIO JAMMING, SATELLITE COMMUNICATIONS, DIGITAL SYSTEMS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE