Richard L Gall

US Patent:

54386187, Aug 1, 1995

Filed:

Nov 15, 1993

Appl. No.:

8/152854

Inventors:

C. Earl Jantzi - Zion IL
Richard C. Gall - Middleton WI

Assignee:

Mytech Systems Corporation - Zion IL

International Classification:

H04M 150

US Classification:

379387

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.