Detection of entropy in connection with audio signals
AssigneeNielsen Media Research, Inc.
InventorVenugopal Srinivasan
Life of this patent
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Abstract
An encoder calculates an entropy of at least a portion of a signal and encodes the signal with the calculated entropy. A decoder decodes the signal in order to recover the encoded entropy. The decoder may also determine an entropy of the signal and may compare the entropy that it determines to the decoded entropy. The decoder detects compression/decompression based upon results from the comparison, and/or the decoder prevents use of a device based upon results from the comparison.
Claims13
A decoder having an input and an output, wherein the input receives a signal, which includes an encoded entropy value, wherein the decoder decodes the signal to read the encoded entropy value from the signal, and wherein the output carries a signal based upon the encoded entropy value, and wherein the decoder is configured to calculate an entropy of the signal and compare the calculated entropy to the encoded entropy value.
A method of decoding a signal, which includes a first calculated entropy value, the method comprising:
- decoding the signal to extract an ancillary code representing the first calculated entropy value from the signal;
- calculating a second entropy of the signal;
- comparing the second calculated entropy of the signal to the first calculated entropy value;
- and
- providing an output based on the comparison of the second calculated entropy of the signal to the first calculated entropy value.
Dependencies are inferred from the claim text.