Accession Number : ADD018708

Title :   Telemetry Bi-Phase-Level to Non-Return-To-Zero-Level Signal Converter

Descriptive Note : Patent, Filed 1 Dec 95, patented 12 Aug 97

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Snelgrove, Andrew H

Report Date : 12 Aug 1997

Pagination or Media Count : 8

Abstract : A signal converter for converting a bi-phase level data stream to non-return to zero level data. The hi-phase level data stream is input to a detector circuit. When the detector circuit detects a high level for more than half of a bit period the detector circuit provides a logic zero pulse at a state s7. If the high level is not at the logic one state for a sufficient time period the detector circuit will not reach state s7. If the time period is to short than the detector circuit is reset to state s0. This high level pulse occurs whenever the second half of a bit period is high followed by a high in the first half of the following bit period. A sample is taken on the first half of every bit period. A low at the detector circuit keeps the detector circuit at state s0. A clock signal generating circuit receives the logic zero pulse and then proceeds through its states s0-s10. When state S1 is reached a clock pulse is provided by the clock signal generating circuit. This clock pulse is supplied to a Flip Flop which also receives the bi-phase level data stream. The clock pulse then clocks the logic level of the bi-phase level data stream through the Flip Flop to its output thereby providing a non-return to zero level coded waveform or data stream.

Descriptors :   *LOGIC CIRCUITS, *PATENTS, *TELEMETER SYSTEMS, COMPUTER LOGIC, WAVEFORMS, FLIP FLOP CIRCUITS, TELEMETERING DATA, GUIDED MISSILE COMPUTERS, SIGNAL GENERATORS, ASYNCHRONOUS COMPUTERS

Subject Categories : Electrical and Electronic Equipment
      Air Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE