Pulse or digital communications – Repeaters – Testing
Patent
1984-08-21
1987-10-13
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
332 11D, 381 29, H04B 1406
Patent
active
047003626
ABSTRACT:
An encoder converts an analog input signal to a digital signal. The encoder comprises a circuit for generating a control signal with a predetermined bandwidth from the input analog signal. The control signal indicates the desired optimum step-size to be applied in the encoder. The encoder further comprises a converter for converting the analog input signal to a digital signal. The converter is responsive to the control signal representing step-size so that the digital signal will be generated in accordance with the step-size information. Since the generation of a limited bandwidth control signal requires time, the encoder also includes a circuit for introducing time delay to the analog input signal, so that the delayed input signal reaches the converter when the control signal is available for digital encoding.
A decoder generates an analog output signal from a digital signal received from an encoder through a transmission medium. The digital signal received includes a digital representation of an analog input signal to the encoder and step-size information which was used to digitally encode the analog signal in the encoder. The decoder comprises a converter responsive to a second control signal of limited bandwidth derived from the step-size information for generating from the digital representation an analog output signal. The analog output signal so generated is similar to the input analog signal.
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Gundry Kenneth J.
Todd Craig C.
Chin Stephen
Dolby Laboratories Licensing Corporation
Griffin Robert L.
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