1982-06-01
1985-04-30
Popek, Joseph A.
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.
Garner Geoffrey M.
Salloway Anthony J.
Plessey Overseas Limited
Popek Joseph A.
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