Audio decoder employing error concealment technique
DCFirst Claim
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1. A method of processing an encoded audio signal, comprising the steps of:
- decoding the encoded signal into vector samples;
replacing those vector samples decoded when a concealment of an error is requested with neutral data;
after said replacing step, buffering the decoded vector samples; and
filtering the decoded vector samples to generate digital samples.
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Abstract
An MPEG audio decoder includes a Vector FIFO buffer and a windowed polyphase filter. Groups of vector samples are zeroed out prior to storage (or after storage, if desired) in the Vector FIFO buffer when error concealment is performed.
18 Citations
28 Claims
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1. A method of processing an encoded audio signal, comprising the steps of:
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decoding the encoded signal into vector samples; replacing those vector samples decoded when a concealment of an error is requested with neutral data; after said replacing step, buffering the decoded vector samples; and filtering the decoded vector samples to generate digital samples. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of generating an analog audio signal in response to an MPEG-encoded signal, comprising the steps of:
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processing the MPEG-encoded audio signals into IDCT vector samples; replacing the vector samples with neutral data when an error concealment is requested; after said replacing step, buffering the IDCT vector samples in groups on a first-in, first-out basis; and reconstructing the audio signal from an output of the filter. - View Dependent Claims (15)
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16. An audio core module, comprising:
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a vector FIFO; a windowed polyphase filter having an input coupled to an output of the vector FIFO; and at least one gate for replacing data for the Vector FIFO buffer with neutral data when an error concealment is requested. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. An audio core module comprising:
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means for decoding an encoded signal; means, responsive to the decoding means, for zeroing out the decoded signal when an error concealment is requested; means for buffering an output of the zeroing-out means; and means for filtering an output of the buffering means to produce samples that can be reconstructed into an analog audio signal. - View Dependent Claims (24)
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25. A method of performing an error concealment in an audio encoder, the method comprising the steps of:
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parsing an input bit stream to obtain Discrete Cosine Transform (DCT) vector samples; dequantizing, rescaling, and transforming the DCT vector samples to form Inverse Discrete Cosine Transform (IDCT) vector samples; replacing the IDCT vector samples with neutral data; and after the replacing, buffering the IDCT vector samples using a Vector FIFO buffer. - View Dependent Claims (26, 27, 28)
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Specification