Speech Activity Detection
AssigneeCambridge Silicon Radio Limited
InventorRobert Young
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Abstract
A method for detecting the presence or absence of an audio signal in a communications system in which an audio signal is encoded by a delta modulation encoding algorithm, and in which a step size parameter is adapted according to characteristics of the encoded signal, the method comprising determining based on the magnitude of the step size parameter whether the encoded signal represents audio activity, and adapting the operation of the communication system based on that determination.
Claims36
A method for detecting the presence or absence of audio activity in a communications system in which an audio signal is encoded by a delta modulation encoding algorithm, and in which a step size parameter is adapted according to characteristics of the encoded signal, the method comprising determining based on the magnitude of the step size parameter whether the encoded signal represents audio activity, and adapting the operation of the communication system based on that determination.
A method for estimating the energy of an audio signal in a communications system in which an audio signal is encoded by a delta modulation encoding algorithm, and in which a step size parameter is adapted according to characteristics of the encoded signal, the method comprising estimating based on the step size parameter the energy of the audio signal.
Apparatus for detecting the presence or absence of audio activity in a communications system in which an audio signal is encoded by a delta modulation encoding algorithm, and in which a step size parameter is adapted according to characteristics of the encoded signal, the communications system comprising a transmitter and a receiver, and the apparatus comprising at least one determination unit for determining based on the magnitude of the step size parameter whether the encoded signal represents audio activity, and an adaptation unit for adapting the operation of the communication system based on that determination.
Apparatus for estimating the energy of an audio signal in a communications system in which an audio signal is encoded by a delta modulation encoding algorithm, and in which a step size parameter is adapted according to characteristics of the encoded signal, and the apparatus comprising an estimation unit for estimating based on the step size parameter the energy of the audio signal.
Dependencies are inferred from the claim text.