초록 ▼

A combination microphone, loudspeaker, and control unit is disclosed which is adapted to be coupled by a multiconductor cable to a radio transceiver which is capable of transmitting and receiving a plurality of radio signals at preselected frequencies. A multi-conductor cable is secured to a housing

A combination microphone, loudspeaker, and control unit is disclosed which is adapted to be coupled by a multiconductor cable to a radio transceiver which is capable of transmitting and receiving a plurality of radio signals at preselected frequencies. A multi-conductor cable is secured to a housing for the unit and is adapted to electrically connect the unit to a radio transceiver. A multi-position switch is mounted in the housing and connected to the cable, with the switch being operable to select individually the preselected frequencies. An electromechanical transducer is mounted in the housing and connected to the cable and operable to convert audible sound wave signals into corresponding audio frequency electrical signals and audio frequency electrical signals into corresponding audible sound wave signals. A transmit/receive switch is mounted on the housing and coupled to the cable and the transducer for selectively enabling the transducer to convert audible sound wave signals into corresponding audio frequency electrical signals and audio frequency electrical signals into corresponding audible sound wave signals. A volume control is mounted on the housing and coupled to the cable and the transducer for varying the amplitude of the audio frequency electrical signals applied to the transducer.

대표청구항 ▼

A combination transducer and control unit adapted to be coupled by a multi-conductor cable to a separate radio transceiver chassis which is capable of transmitting and receiving a plurality of radio signals at preselected frequencies, comprising: a housing of a size which is conveniently held by one

A combination transducer and control unit adapted to be coupled by a multi-conductor cable to a separate radio transceiver chassis which is capable of transmitting and receiving a plurality of radio signals at preselected frequencies, comprising: a housing of a size which is conveniently held by one hand; a multi-conductor cable secured to said housing and adapted to electrically connect said combination unit to said radio transceiver chassis; multi-position switch means mounted in said housing and connected to said cable, said switch means being operable to select individually said preselected frequencies; illuminated channel indicating means mounted on saiD housing and responsive to said switch means for indicating the frequency to which said transceiver is turned; an electromechanical transducer mounted in said housing and connected to said cable transmit/receive switch means mounted on said housing and coupled to said cable and said transducer for selectively enabling said transceiver to transmit or receive said radio signals; and volume control means mounted on said housing and coupled to said cable and said transducer for varying the amplitude of the audio frequency electrical signals produced by said transceiver; said frequency-selecting switch means, transmit/receive switch means, and volume control means each being located on said housing so as to be operable by the finger of the same hand of the operator which is holding the unit.