Tone generator

Details Tone generator Tone generator

1974-10-23

1976-12-28

Claffy, Kathleen H.

H04Q 912

Patent

active

040003795

ABSTRACT:
A modified Sallen and key active filter useful for generating tones in a tone generator which can be connected to a telephone line. The modification allows a broad range of frequencies to be generated with a relatively constant output amplitude, the output signal of which can be usefully employed for D.T.M.F. or interoffice multifrequency signal generation.

REFERENCES:
patent: 3609567 (1971-09-01), Kerwin et al.
patent: 3611194 (1971-10-01), Codd
patent: 3699477 (1972-10-01), McKell
patent: 3720887 (1973-03-01), Matthews
patent: 3805178 (1974-04-01), Rollett

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