Hands-free telephone

Details Hands-free telephone Hands-free telephone

H - Electricity

04

B

325/17

H04B 7/26 (2006.01) H04M 9/10 (2006.01) H04M 3/40 (2006.01) H04Q 7/00 (2006.01)

Patent

CA 2021793

ABSTRACT OF THE DISCLOSURE A hands-free telephone for use on a vehicle and having a handset incorporating a radio section therein and a hands-free adapter incorporating a hands-free telephone unit therein. To eliminate howling, this kind of telephone generally needs two variable attenuators, or variolossers, each for changing the level of respective one of a receive and a transmit signal to be applied to a speaker of a hands-free telephone unit and a radio section, respectively, so as to maintain the two levels in a predetermined relation, and a variable resistor for adjusting the volume of voice to be outputted by the speaker. In the present invention, the variable resistor is implemented by a variable resistor which adjusts the level of a receive signal to be applied to a receiver installed in the radio section. This receive signal is controlled in level by a third variable attenuator simultaneously with the above-mentioned variable attenuators.

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