Delta-modulation encoder

Details Delta-modulation encoder Delta-modulation encoder

H - Electricity

03

M

354/69

H03M 3/02 (2006.01) H03F 3/45 (2006.01)

Patent

CA 1089099

ABSTRACT: In a delta-modulation encoding arrangement ha- ving step-size control drift voltages and miss-match-be- tween the charge and discharge pulses for the first in- tegrating network in the feedback circuit produce an additional DC voltage on this integrating network. This additional DC voltage is compensated by an additional feedback circuit comprising a second integrating network. However, if the signal to be encoded rapidly decreases from a large to a small amplitude and when after this rapid decrease the information signal only has a small amplitude an additional distortion is introduced for these small signals. To obviate this a modulation arrangement is included in the extra feedback circuit, which modula- tion arrangement is controlled by a control signal which derives a control signal from the delta modulation out- put pulses. The energy contents of the delta modulation pulses which are applied through the modulation arrange- ment to the second integrating network is varied in such a way that this energy contents decreases when the step- size increases and vice versa.

253955

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