Pcm tone signal generator

Details Pcm tone signal generator Pcm tone signal generator

H - Electricity

04

J

363/14, 363/22

H04J 3/12 (2006.01) H04J 3/10 (2006.01) H04Q 1/457 (2006.01)

Patent

CA 1124898

PCM TONE SIGNAL GENERATOR Abstract of the Disclosure A digital tone signal generator supplies PCM sample sequences of various signalling tones to TDM channels in an associated switching facility to accommodate signalling requirements. The phase of any one tone supplied to various channels is essentially different to minimize crosstalk in telephone network transmission facilities. The tone signal generator includes an address sequencer for generating a repetitive series of addresses. Each repetition preferably includes more addresses than channel occurrences per frame, the number of addresses corresponding to a dividend yielding other than a whole number quotient with a divisor corresponding to the number of samples in the tone sample sequence and integer submultiples of same other than 1. A memory responsive to the addresses includes the samples of the tone sample sequence stored at address accessible locations. The samples are stored in such order that occurrences of the addresses cause the memory to read out samples in the order of the tone sample sequence progressively with each occurrence of a given TDM channel. - i -

322547

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