Echo plug for a wireless telephone

Details Echo plug for a wireless telephone Echo plug for a wireless telephone

2005-06-21

2005-06-21

Trost, William (Department: 2683)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S424000, C455S425000, C455S426100, C379S021000, C379S029010

Reexamination Certificate

active

06909894

ABSTRACT:
Echo plugs are plugged into the hands-free jacks of wireless telephones to facilitate testing. One echo plug has a pin and a circuit. The pin is physically compatible with the hands-free jack of a wireless telephone. The pin has a speaker connection and a microphone connection. The circuit couples the speaker connection to the microphone connection. In operation, this echo plug receives a signal from the speaker connection of the hands-free jack and transfers the signal to the microphone connection of the hands-free jack. Another echo plug has two pins and a circuit. The pins are physically compatible with the hands-free jack of a wireless telephone. The first pin has a speaker connection, and the second pin has a microphone connection. The circuit couples the speaker connection of the first pin to the microphone connection of the second pin. In operation, this echo plug receives a signal from the speaker connection of a hands-free jack in a first wireless telephone and transfers the signal to the microphone connection of a hands-free jack in a second wireless telephone.

REFERENCES:
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patent: 5790657 (1998-08-01), Fujiwara
patent: 5875398 (1999-02-01), Snapp
patent: 5943617 (1999-08-01), Nakamura
patent: 6081724 (2000-06-01), Wilson
patent: 6108404 (2000-08-01), Hardy et al.

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