Digital delta encoder and decoder

Details Digital delta encoder and decoder Digital delta encoder and decoder

H - Electricity

03

K

354/69

H03K 13/22 (1980.01)

Patent

CA 1042106

ABSTRACT OF THE DISCLOSURE Amplitude varying signal is time sampled at constant clock rate (E.G. 40 kHz for voice) and sample is compared (in encoder) with analogue conversion of digitally stored previous value. If signal has increased, logical "1" is transmitted, if it has decreased, logical "0" is transmitted; simultaneously digitally stored value is increased for "1", decreased for "0", by increment stored in companding counter. To make increment match signal change between successive samples, companding counter content is increased by unity for three successive "1" or "0" signals, and decreased by six successive alternating "1" and "0" signals. Decoder logic is same as encoder except that no comparator is used, encoded signals operating directly upon digital stores; analogue conversion of digitally stored value is output.

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