Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Patent
1993-11-15
1995-08-01
Dwyer, James L.
Telephonic communications
Substation or terminal circuitry
Conversion of signal form
379389, 379360, 379352, 379351, 379441, H04M 150
Patent
active
054386187
ABSTRACT:
A vocal frequency suppression apparatus for suppressing selected portions of a vocal signal to prevent inadvertent control of components controlled by dual tone multi-frequency ("DTMF") codes. The vocal frequency suppression apparatus includes a DTMF code generator having a plurality of user-selectable switches. The apparatus further produces a vocal signal which may contain vocal frequencies which correspond to at least one frequency of at least one of the DTMF codes. The apparatus includes a device for suppressing one or more of the vocal frequencies which correspond to frequencies found in the DTMF codes to prevent inadvertent control of any DTMF controlled components by the vocal signal. The suppression device is operably located between the producing device and the DTMF generator.
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Gall Richard C.
Jantzi C. Earl
Dwyer James L.
Mytech Systems Corporation
Saint-Surin Jacques M.
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