Telephone handsets

Patent

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H04M 100

Patent

active

045145962

ABSTRACT:
A telephone subscriber subset including a transducer for generating audible signalling tone information in which the signalling tones are received at the input terminal as substantially sinusoidal electrical waveforms and including a converter within the handset for conversion of the signalling tones to a substantially non-sinusoidal electrical waveforms before feeding to the transducer.

REFERENCES:
patent: 4156800 (1979-05-01), Sear et al.

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