H - Electricity – 03 – M
Patent
H - Electricity
03
M
363/15, 354/68
H03M 1/00 (2006.01)
Patent
CA 1052471
ABSTRACT OF THE DISCLOSURE PCM encoder-decoder having a digital code generator which counts through a digital count during a comparison period. An analog voltage wave- form generator sweeps in a non-linear manner from a maximum negative to a maximum positive voltage during the same period. The digital code generator and analog voltage waveform generator are synchronized so that during each instant of each comparison period they have corresponding values. At the start or each comparison period a sample of an audio voice signal to be en- coded is strapped in a capacitor. During a comparison period the sample is compared with the output of the waveform generator. When equality is detected the count of the digital code generator at that instant is stored as a PCM digital signal for transmission with other PCM signals in accordance with known TDM techniques. A PCM digital signal which is received an accordance with known TDM techniques is stored. in a register prior to the start of a comparison period. During a comparison period the stored digital signal is compared with the output of the digital code generator. When equality is detected, the voltage of the analog signal from the analog voltage waveform generator at that instant is trapped in a capacitor. At the end of the comparison period the trapped charge is released as a pulse to a low-pass filter. A series of pulses is converted to a continuous audio signal by the low-pass filter.
219551
Gte Automatic Electric (canada) Ltd.
Na
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