Soft decision audio decoding system
AssigneeShure Acquisition Holdings, Inc.
InventorRobert Mamola
Life of this patent
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Abstract
A soft decision audio decoding system for preserving audio continuity in a digital wireless audio receiver is provided that deduces the likelihood of errors in a received digital signal, based on generated hard bits and soft bits. The soft bits may be utilized by a soft audio decoder to determine whether the digital signal should be decoded or muted. The soft bits may be generated based on the detected point and a detected noise power, or by using a soft-output Viterbi algorithm. The value of the soft bits may indicate confidence in the strength of the hard bit generation. The soft decision audio decoding system may infer errors and decode perceptually acceptable audio without requiring error detection, as in conventional systems, as well as have low latency and improved granularity.
Claims20
A method, comprising:
- detecting a characteristic, associated with a digital modulation scheme, in a digital signal associated with a received radio frequency (RF) signal;
- generating hard bits based on the detected characteristic;
- determining, based on the detected characteristic, one or more approximate log likelihood ratios indicating a confidence in a strength of the hard bits;
- and
- decoding the digital signal to generate a digital audio signal, wherein decoding the digital signal comprises:
- comparing the one or more approximate log likelihood ratios to a predetermined threshold, and
- generating, based on the comparison, codewords of the digital audio signal, wherein the codewords comprise one or more of the hard bits or one or more zero sample bits.
An apparatus comprising:
- one or more processors;
- and
- memory storing instructions that, when executed by the one or more processors, cause the apparatus to:
- detect a characteristic, associated with a digital modulation scheme, in a digital signal associated with a received radio frequency (RF) signal;
- generate hard bits based on the detected characteristic;
- determine, based on the detected characteristic, one or more approximate log likelihood ratios indicating a confidence in a strength of the hard bits;
- and
- decode the digital signal to generate a digital audio signal, wherein the instructions, when executed by the one or more processors, cause the apparatus to decode the digital signal by causing:
- comparing the one or more approximate log likelihood ratios to a predetermined threshold, and
- generating, based on the comparison, codewords of the digital audio signal, wherein the codewords comprise one or more of the hard bits or one or more zero sample bits.
A non-transitory computer readable medium storing instructions that, when executed, cause:
- detecting a characteristic, associated with a digital modulation scheme, in a digital signal associated with a received radio frequency (RF) signal;
- generating hard bits based on the detected characteristic;
- determining, based on the detected characteristic, one or more approximate log likelihood ratios indicating a confidence in a strength of the hard bits;
- and
- decoding the digital signal to generate a digital audio signal, wherein the instructions, when executed, cause decoding the digital signal by causing:
- comparing the one or more approximate log likelihood ratios to a predetermined threshold, and
- generating, based on the comparison, codewords of the digital audio signal, wherein the codewords comprise one or more of the hard bits or one or more zero sample bits.
Dependencies are inferred from the claim text.