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.

Abstract: A telephone switch-hook actuator apparatus for use with a telephone unit incorporating a conventional handset whereby the telephone switch-hook actuator apparatus serves to operate the telephone switch-hook in place of the handset. Accordingly, a headset worn upon the users head may be utilized with a conventional telephone unit, particularly those telephone units which utilize electronic logic line switching circuitry.