Telephone tone signalling receiver

Details Telephone tone signalling receiver Telephone tone signalling receiver

H - Electricity

04

M

379/32, 379/59,

H04M 7/00 (2006.01) H04Q 1/45 (2006.01) H04Q 1/453 (2006.01)

Patent

CA 1072695

TELEPHONE TONE SIGNALLING RECEIVER Abstract of the Disclosure A tone receiver, for receiving audio frequency tone signals typically used in telephone signalling, includes a reference frequency generator and a modulator for up-converting audio frequencies. Telephone network tone signalling is up-converted and coupled to a filter including a piezoelectric element. Alternating current signals passing through the filter indicate the presence of a tone signal of a predetermined frequency. Multiple frequency tone signals are detectable using a plurality of modulators and filters, each modulator being supplied with one of a plurality of reference frequencies. In one example, balanced modulation is used with reference frequencies being supplied in the form of square waves. - i -

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