Apparatus, system and method for merging code layers for audio encoding and decoding and error correction thereof
AssigneeThe Nielsen Company (US), LLC
InventorsWendell Lynch, John Stavropoulos, David Gish, Alan Neuhauser
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Abstract
Apparatus, system and method for encoding and decoding ancillary code for digital audio, where multiple encoding layers are merged. The merging allows a greater number of ancillary codes to be embedded into the encoding space, and further introduces efficiencies in the encoding process. Utilizing certain error correction techniques, the decoding of ancillary code may be improved and made more reliable.
Claims20
A method of decoding audio data acoustically embedded with a message structure comprising a sequence of message symbols coexisting within two encoded layers along a time base of the audio data, each message symbol comprising a combination of substantially single-frequency components and a symbol interval within a time base of the audio data, comprising:
- detecting the substantially single-frequency components of the message symbols;
- and
- detecting the message symbols based on the detected substantially single-frequency components of the message symbols, the detection based on a synchronization of the message symbols between the two encoded layers.
A method of decoding audio data acoustically embedded with a message structure comprising a sequence of message symbols coexisting within two encoded layers along a time base of the audio data, each message symbol comprising a combination of substantially single-frequency components and a predefined symbol interval within a time base of the audio data, comprising:
- detecting the substantially single-frequency components of the message symbols;
- detecting the message symbols based on the detected substantially single-frequency components thereof, wherein the detection is based on a synchronization of the message symbols between the two encoded layers;
- and
- performing error correction on at least some of the detected message symbols, wherein the error correction comprises determining a largest signal-to-noise ratio (SNR) value of the message symbols for each of a plurality of message positions.
A decoder to decode audio data acoustically embedded with a message structure comprising a sequence of message symbols coexisting within two encoded layers along a time base of the audio data, each message symbol comprising a combination of substantially single-frequency components and a symbol interval within a time base of the audio data, comprising:
- a first decoder portion to detect the substantially single-frequency components of the message symbols;
- and
- a second decoder portion to detect the message symbols based on the detected substantially single-frequency components of the message symbols, the detection based on a synchronization of the message symbols between the two encoded layers.
A decoder configured to decode audio data acoustically embedded with a message structure comprising a sequence of message symbols coexisting within two encoded layers along a time base of the audio data, each message symbol comprising a combination of substantially single-frequency components and a predefined symbol interval within a time base of the audio data, comprising:
- a first decoder portion for detecting the substantially single-frequency components of the message symbols;
- a second decoder portion for detecting the message symbols based on the detected substantially single-frequency components thereof, wherein the detection is based on a synchronization of the message symbols between the two encoded layers;
- and
- a third decoder portion configured to perform error correction on at least some of the detected message symbols, wherein the error correction of the third decoder portion is configured to determine a largest signal-to-noise ratio (SNR) value of the message symbols for each of a plurality of message positions.
Dependencies are inferred from the claim text.