Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent
1987-10-20
1989-05-09
Mottola, Steven
Telephonic communications
Substation or terminal circuitry
For loudspeaking terminal
381107, H04M 908
Patent
active
048295655
ABSTRACT:
This invention relates to the adjustment of sound intensity (volume) from appliances which communicate audible information to users. Information carried by sound energy from an appliance competes with whatever audible noise is present in the listener's area. Some appliances have volume controls that let the user adjust sound intensity. These controls do not deal adequately with background noise that changes often, and which makes it necessary for the user to frequently reset the volume control. A setting of volume control that is appropriate at a quiet time, may make it impossible to understand a message when background noise becomes louder. Similarly, a volume control setting which is suitable when background noise is high may produce a message which is disturbingly loud when background noise is low.
The present invention solves this problem of audio volume control by monitoring background noise in the listening area and automatically adjusting the sound level of the appliance accordingly. By raising the volume of sound in the presence of higher background noise, and lowering the volume of sound when background noise level is lower, the needs of the user are better met.
REFERENCES:
patent: 3963898 (1976-06-01), Randmere et al.
patent: 4254303 (1981-03-01), Takizawa
patent: 4628526 (1986-12-01), Germer
patent: 4715063 (1987-12-01), Haddad et al.
"Automatic Voice Volume Control Circuit", Japan Institute of Invention and Innovation, vol. 8-18, May 20, 1983 (in Japanese).
"Effect of Noise on Listening Levels in Conference Telephony", Mark B. Gardner, J. of the Acoustical Society, vol. 34, No. 12, pp. 2354-2355.
"Beskrivning 1551-325, Automatisk Nivakontroll ANK 593 298/1, Mikrofonforstarkare 593 296/1", L. M. Ericsson, Nov. 2, 1979 (in Swedish).
"Vorschlag fur eine neuartige automatische Pegelsteuerung fur raumakustiche Aufgaben", Ulrich Fusban, Nachrichten Elektronik, Feb. 1978, p. 51.
"Electro-Acoustical Equipment for the Trains and Stations of the Munich Underground", Reinhard Bauersachs and Hans Gerland, Siemens Review, vol. 41, No. 12, 1974, pp. 567-569.
Flyer from JBL, Inc. for Model 7124B AGC Amplifier.
Flyer from UREI, Inc., P.O. Box 2200, 8500 Balboa Boulevard, Northridge, Calif. 91329, for Model 950 ANCA Ambient Noise Controlled Amplifier.
Flyer from ALTEC Sound Products Division for Model 1605B Noise-Operated Automatic Level Adjustment Device.
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