Pulse or digital communications – Repeaters – Testing
Patent
1984-12-19
1987-10-13
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 37, 375122, 380 6, 381 31, G10L 100
Patent
active
047003600
ABSTRACT:
A system for converting analog input waveforms into digital signals is disclosed. The system reduces the bit rate required for the transmission of signals over a transmission channel such that the reproduced analog signals at the receiver are perceived still to be of subjectively high quality to the human sensory system, e.g., the human ear. The system includes an extrema coder for encoding only the times of occurrence of extrema, or maximum and minimum values in the input analog waveform, including the times of occurrence of naturally occurring or injected substantially random, broadband noise. The output of the extrema coder is coupled to an interface circuit, which in one embodiment, wherein a delta modulator digitizing stage is used, comprises an integrator. The output of the interface circuit is fed to a digitizing stage, e.g., in one embodiment, a delta modulator. The output of the digitizing stage is then coupled to the transmission channel for transmission to the receiver. The receiver includes appropriate decoding circuitry for subjectively reproducing the original analog signal. In another embodiment, a pulse code modulator is used as the digitizing stage and the interface circuit comprises a low pass or bandpass filter. Appropriate pulse code modulation decoder means is provided at the receiver in this embodiment.
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Journal of the Acoustical Society of America: vol. 20, No. 1, Jan. 1984, pp. 42-51.
Extrema Systems International Corporation
Safourek Benedict V.
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