Telecommunications – Transmitter and receiver at separate stations – Distortion – noise – or other interference prevention,...
Reexamination Certificate
2007-04-30
2010-06-22
Dao, Minh D (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Distortion, noise, or other interference prevention,...
C455S501000, C455S063100, C455S570000, C455S114200, C381S071700, C381S094300, C704S203000
Reexamination Certificate
active
07742746
ABSTRACT:
A mobile audio device (for example, a cellular telephone, personal digital audio player, or MP3 player) performs Audio Dynamic Range Control (ADRC) and Automatic Volume Control (AVC) to increase the volume of sound emitted from a speaker of the mobile audio device so that faint passages of the audio will be more audible. This amplification of faint passages occurs without overly amplifying other louder passages, and without substantial distortion due to clipping. Multi-Microphone Active Noise Cancellation (MMANC) functionality is, for example, used to remove background noise from audio information picked up on microphones of the mobile audio device. The noise-canceled audio may then be communicated from the device. The MMANC functionality generates a noise reference signal as an intermediate signal. The intermediate signal is conditioned and then used as a reference by the AVC process. The gain applied during the AVC process is a function of the noise reference signal.
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Choy Eddie L. T.
Gupta Samir Kumar
Kulkarni Prajakt V.
Wang Song
Xiang Pei
Dao Minh D
Diaz Hidalgo Espartaco
Loomis Timothy F.
QUALCOMM Incorporated
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