Accession Number : ADD009400

Title :   Manchester Code Decoding Apparatus.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Quesnell,Harris A , Jr

Report Date : 23 Feb 1982

Pagination or Media Count : 9

Abstract : An apparatus for decoding a Manchester encoded waveform is described in which a gating circuit responds to the mid-cell transitions in the encoded waveform to produce an enabling signal which causes a clock circuit to generate high frequency clock pulses. A programmable counter accumulates the generated clock pulses. If the counter exceeds a clock count threshold set by a multiposition switch before the beginning of the following enabling signal, it causes a storage element to sample the encoded waveform and store the sample to provide an output signal representing decoded data. A second, substantially equivalent circuit decodes timing from the encoded waveform. The multiposition switch provides the apparatus with the capability to decode encoded waveforms of varying frequency.

Descriptors :   *Patents, *Gates(Circuits), *Waveforms, *Decoding, Translations, Equivalent circuits, Signals, High frequency, Pulses, Threshold effects

Subject Categories : Electrical and Electronic Equipment
      Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE