Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Patent
1994-06-15
1995-09-26
Hofsass, Jeffery A.
Telephonic communications
Substation or terminal circuitry
Sidetone control or hybrid circuit
379 69, 379 88, 379391, 379442, H04M 900, H04M 162
Patent
active
054540364
ABSTRACT:
An attended messaging system having an audio message recording and playback device connected in series between a telephone base unit and a telephone receiver handset or headset. The recording and playback device includes a solid-state audio memory chip for storing a message and pairs of operational amplifiers connecting the memory chip of the recoding and playback device with the telephone base unit and with the speaker and microphone of the telephone receiver handset or headset in a differential circuit of audio signal channels. The recording and playback device is manually-actuable by means of buttons or switches to operate in a recording mode, in which a message spoken into the handset or headset microphone is stored in the audio memory chip, or in a playback mode, in which the previously recorded message is communicated through the telephone base unit and telephone line to a designated remote telephone station with which audio communication has been established by the telephone base unit. When the recording and playback device is inactive, i.e., in neither the recording or playback mode, a person can communicate with a party at the remote telephone station through the telephone receiver handset or headset. Excessively loud sidetone in the handset or headset speaker is avoided by arranging the polarity and signal strengths of the sidetone signals from telephone base unit and recording and playback device to combine in phase opposition in a 2X--X manner.
REFERENCES:
patent: 1548028 (1918-10-01), Egerton
patent: 3728486 (1973-04-01), Kraus
patent: 3863029 (1975-01-01), Zimmermann
patent: 4001508 (1977-01-01), Johnson
patent: 4359607 (1982-11-01), Hannig et al.
patent: 4406925 (1983-09-01), Jordan et al.
patent: 4446335 (1984-05-01), Lee et al.
patent: 4605975 (1986-08-01), Beaman
patent: 4718083 (1988-01-01), Boeckmann
patent: 4734930 (1988-03-01), Quiros et al.
patent: 4817127 (1989-03-01), Chamberlin et al.
patent: 4930156 (1990-05-01), Norris
patent: 4941168 (1990-07-01), Kelly, Jr.
patent: 4959852 (1990-09-01), Kern et al.
patent: 4993060 (1991-02-01), Kelly
patent: 5029198 (1991-07-01), Walpole et al.
patent: 5075894 (1991-12-01), Iwase et al.
patent: 5241584 (1993-08-01), Hardy et al.
patent: 5353347 (1994-10-01), Irissou et al.
Gleeman Alan N.
Gleeman Robert J.
Hofsass Jeffery A.
Weaver Scott L.
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