Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent
1993-11-24
1995-11-14
Hofsass, Jeffery A.
Telephonic communications
Substation or terminal circuitry
For loudspeaking terminal
379389, 379390, 379391, 379392, 381 55, 381106, H04M 908
Patent
active
054673933
ABSTRACT:
Selectively compressing the signal supplied to a loudspeaker based upon the volume setting for the sound level to be produced by the loudspeaker improves the intelligibility of human speech produced by a loudspeaker at high volume levels. Compression of the signal to the loudspeaker prevents the loudspeaker from overloading. The level of compression may be adjusted based upon the volume setting. The amplitude of an audio signal sent to a loudspeaker may be increased if below a preselected pivot point and increased if above the pivot point. The amount of increase or decrease in the amplitude may be proportional to the difference between the amplitude of the audio signal and the pivot point. This difference may also be raised to the power of a shape factor to determine the amount of increase or decrease in the amplitude of the audio signal.
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Ericsson Inc.
Hofsass Jeffery A.
Saint-Surin Jacques M.
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