Pulse code modulation (pcm) data-marking
AssigneeCirrus Logic International Semiconductor Ltd.
InventorsShafagh Kamkar, Bruce E. Duewer, Dylan A. Hester
Life of this patent
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Abstract
An encoding for data in an audio data stream may be indicated in the data stream using a footer stored in low-order bits of data frames in the audio data stream. When the audio data stream may include either Pulse Code Modulation (PCM) or Direct Stream Digital (DSD) data, PCM data may be marked with a footer to indicate the encoding as PCM. The footer may be a fixed value, an alternating fixed value, a predetermined sequence of values, or a value computed based on the PCM data. Examples of computed values for the footer marker may include an error code, an error correction code (ECC), and a scrambled code.
Claims40
A method, comprising:
- receiving an audio data stream;
- analyzing a selected set of low-order bits of a plurality of frames from the audio data stream;
- and
- identifying the encoding of the audio data stream based on contents of the selected set of low-order bits.
A method, comprising:
- receiving an audio signal to encode into an audio data stream;
- and
- encoding the audio signal into a plurality of data frames for the audio data stream, wherein each of the plurality of data frames comprises a footer value in low-order bits of each of the plurality of data frames indicating an encoding of the audio data stream.
An apparatus, comprising:
- an audio controller configured to perform steps comprising:
- receiving an audio data stream;
- analyzing a selected set of low-order bits of a plurality of frames from the audio data stream;
- and
- identifying the encoding of the audio data stream based on contents of the selected set of low-order bits.
An apparatus, comprising:
- an audio controller configured to perform steps comprising:
- receiving an audio signal to encode in an audio data stream;
- and
- encoding the audio signal into a plurality of data frames for the audio data stream, wherein each of the plurality of data frames comprises a footer value in low-order bits of each of the plurality of data frames indicating an encoding of the audio data stream.
Dependencies are inferred from the claim text.