GENERATEUR DE SIGNAL DE REFERENCE POUR LA MODULATION PCM;

摘要

A reference signal generator for use in the encoder and/or decoder of a pulse code modulation information transmission system with non-uniform coding, for the simultaneous generation of sequences of signal elements having quantized amplitude values and of sequences of code words characterizing the quantized amplitude values of the signal elements. The reference generator comprises a source of clock pulses, a pulse counter which is provided with a series of counting stages, a resistance-encoding network which is coupled to the counting stages of the pulse counter and to a signal output for the signal elements. The reference generator further comprises and a switching unit comprising a plurality of switching elements, each of which is associated with an individual counting stage of the pulse counter for decoupling the counting stage from the preceding counting stages and for directly coupling the source of clock pulses to the counting stage such that the latter operates as the first counting stage. A control unit is provided for actuating the switching elements according to a program.