Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent
1996-06-11
1999-01-05
Hunter, Daniel S.
Telephonic communications
Supervisory or control line signaling
Using line or loop condition detection
379390, 379409, 379420, 381110, H04M 900
Patent
active
058570195
ABSTRACT:
An improved speakerphone that may be viewed as a modification of a conventional half-duplex speakerphone that includes transmit and receive attenuators for alternatively isolating either a speaker or a microphone from a phone line. The attenuators are controlled by a controller that compares a signal generated by the microphone with a signal received on the phone line to determine which of the transmit or receive attenuators should be turned on. In the present invention, a first variable gain amplifier is connected so as to amplify the signal generated by the microphone prior to the signal being connected to the controller, and a second variable gain amplifier is connected so as to amplify the signal received on the phone line prior to the signal being connected to the controller. The first and second variable gain amplifiers have adjustable gain controls that are connected such that the gain of the first variable amplifier is decreased when the gain of the second variable amplifier is increased and vice versa. The adjustable gain control of one of the adjustable gain amplifiers is accessible to the user of the speakerphone and allows the user to adjust the threshold at which his voice will take over the conversation.
REFERENCES:
patent: 4879745 (1989-11-01), Arbel
patent: 5170430 (1992-12-01), Schuh
patent: 5485515 (1996-01-01), Allen et al.
patent: 5544242 (1996-08-01), Robinson
patent: 5559880 (1996-09-01), Shiono
Adams Joel Q.
Findley Geof
Iglehart David
Lester Leland
Hunter Daniel S.
Saint-Surin Jacques
Siemens Business Communication Systems, Inc.
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