Digital composite tone alerting

Details Digital composite tone alerting Digital composite tone alerting

H - Electricity

04

M

379/12

H04M 3/02 (2006.01) H04M 19/02 (2006.01) H04M 19/04 (2006.01) H04Q 1/448 (2006.01) H04Q 1/457 (2006.01)

Patent

CA 1287417

ABSTRACT Within a digital PBX system or the like, an apparatus permits provision of digital composite tone alerting particularly suitable for piezoelectric transducers with one arbitrarily selectable tone, by means of logic circuits for latching the sign-bit in a received PCM signal that exceeds a validity threshold, and by combining the toggling sign-bit with another tone to yield the composite tone.

560534

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