Adaptive delta modulator

Details Adaptive delta modulator Adaptive delta modulator

H - Electricity

03

M

354/69

H03M 3/02 (2006.01)

Patent

CA 1155556

PHT. 80-443 -6- ABSTRACT: An adaptive delta modulator must produce at its output a periodic 0-1 sequence when the input signal (w) to be coded assumes zero value. However, on account of the unavoidable tolerances of the components used, deviations of a periodic 0-1 sequence are produced. One of the con- sequences of this fact in an increase in the idle channel noise in the decoded signal at the receiving end. To obviate this disadvantage, the delta modula- tor is provided with a generator (GE) to produce a periodic 0-1 sequence which is transmitted to the receiver instead of the delta coded signal. This generator (GE) is switched to the output line of the delta modulator at the instant at which the output voltage (Us) of a filter (IN) for determining the instantaneous quantising unit of the delta modulator, assumes zero value. If this filter (IN) is implemented with digital components, the generator (GE) is triggered by the output pulses of a gate (G1) whose inputs are connected to the respective locations of the input signal storing means (E) of the filter (IN). A delay line (V) prevents triggering of the generator (GE) at extremely short pauses in the input signal (w) to be coded.

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