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US 2022/0028402 A1Published application
Time domain spectral bandwidth replication
AssigneeShure Acquisition Holdings, Inc.
InventorsWenshun Tian, Michael Ryan Lester
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Abstract
A wireless audio system for encoding and decoding an audio signal using spectral bandwidth replication is provided. Bandwidth extension is performed in the time-domain, enabling low-latency audio coding.
Claims21
1-20. (canceled)
A method operable by an audio system, the method comprising:
- encoding an audio signal, wherein the step of encoding the audio signal comprises:
- separating the audio signal into a high band signal and a low band signal;
- encoding the low band signal into an encoded low band codeword;
- determining a high band signal template by comparing a spectrum envelope corresponding to the high band signal to a plurality of templates;
- and
- generating a bit stream based on the encoded low band codeword and the high band signal template;
- and
- transmitting the bit stream.
5 more elements
A method operable by an audio system, the method comprising:
- receiving a bit stream;
- and
- decoding the bit stream, wherein decoding the bit stream comprises:
- decomposing the bit stream into a received low band codeword and a received high band codeword;
- decoding a low band signal from the received low band codeword;
- determining a high band signal type, a gain, and a high band signal template from the received high band codeword;
- reconstructing a decoded high band signal based on the high band signal type, the gain, and the high band signal template;
- and
- combining the low band signal and the high band signal into a full band signal.
6 more elements
A method operable by an audio system, the method comprising:
- (A) encoding an audio signal, wherein the step of encoding the audio signal comprises:
- separating the audio signal into a high band signal and a low band signal;
- encoding the low band signal directly into an encoded low band codeword;
- determining a high band signal template based on the high band signal;
- and
- determining a bit stream based on the encoded low band codeword and the high band signal template;
- (B) transmitting the bit stream;
- and
- (C) decoding the transmitted bit stream, wherein the step of decoding comprises:
- decomposing the transmitted bit stream into a received low band codeword and a received high band codeword;
- decoding the low band signal directly from the received low band codeword;
- reconstructing a decoded high band signal based on the received high band codeword;
- and
- combining the low band signal and the high band signal into a full band signal.
11 more elements
Dependencies are inferred from the claim text.