Automatic measurement of audio presence and level by direct processing of an MPEG data stream
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United States of America Patent
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Mar 22, 2011
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N/A
app pub date -
Sep 12, 2003
filing date -
Sep 12, 2003
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Abstract
Automatic measurements are made of audio presence and level in an audio signal by direct processing of an MPEG data stream representing the audio signal, without reconstructing the audio signal. Sub-band data is extracted from the data stream, and the extracted sub-band data is dequantized and denormalized. An audio level for the dequantized and denormalized sub-band data is measured without reconstructing the audio signal. Channel characteristics are used in measuring the audio level of the sub-band data, wherein the channel characteristics are used to weight the measured levels. The measured levels are compared against at least one threshold to determine whether an alarm should be triggered.
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