Pulse or digital communications – Repeaters – Testing
Patent
1989-03-01
1991-02-26
Olms, Douglas W.
Pulse or digital communications
Repeaters
Testing
341143, 341164, H04B 1406
Patent
active
049966960
ABSTRACT:
A waveform encoder/decoder includes an encoder having an input for an audio signal to be encoded, and an output whereby the digitally encoded signal is passed to a transmission link and then to a corresponding decoder. The encoder includes detectors for monitoring the digital output signal for slope overload and idle pattern respectively and setting a corresponding value in a state machine. The value stored in the state machine is used to control a pulse width generator which in turn controls the enable time of a tri-state gate connected in the feedback path from the output back to the input. An R.C. filter is used to reconstruct the digital output from the gate to form an estimate of the audio input signal, and this estimated signal is compared with the actual input signal in a comparator. A D-type flip-flop is used to digitize the output from comparator to generate the signal to be output to the transmission link. The circuit, being fully digital, ensures improved repeatability and is particularly convenient and low in cost.
REFERENCES:
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patent: 3582784 (1971-06-01), Gaunt, Jr.
patent: 3706944 (1972-12-01), Tewksbury
patent: 3806806 (1974-04-01), Brolin
patent: 3995218 (1976-11-01), Moriya et al.
patent: 4243974 (1981-01-01), Mack
patent: 4313206 (1982-01-01), DeFreitas
patent: 4384278 (1983-05-01), Benjamin
patent: 4411002 (1983-10-01), Auger
Chin Stephen
Olms Douglas W.
Shaye Communications Limited
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