Electrical audio signal processing systems and devices – Including amplitude or volume control – Automatic
Reexamination Certificate
2007-07-10
2007-07-10
Chin, Vivian (Department: 2615)
Electrical audio signal processing systems and devices
Including amplitude or volume control
Automatic
C381S104000, C381S109000, C455S569100, C084S702000, C084S663000
Reexamination Certificate
active
09946109
ABSTRACT:
A method for dynamically controlling audio signal gain in a communication device starts with determining a level of an input audio signal. The level is then mapped against a table of predetermined corresponding gain targets to determine an appropriate gain target for that level. The gain targets are then applied to the audio signal, which is then output. The invention is particularly suited to speakerphone operation in a communication device, wherein the gain targets provide compression, expansion or limiting so that distant speakers can be heard clearly.
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Applicant's admitted piror art, p. 1, lines 17-25.
Applicant's admitted prior art, p. 1, lines 17-25.
Cranfill David B.
Crochiere Ronald
Herkert Arthur G.
Kaliyaperumal Kesavarajan
Chin Vivian
Faulk Devona E.
Mancini Brian M.
Motorola Inc.
Vaas Randall S.
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