System and method for concealment of data loss in digital audio transmission
First Claim
1. A method for concealing errors detected in an input audio bit stream, the digital audio bit stream configured as a series of packets, said method comprising the steps of:
- detecting a first beat and a subsequent plurality of beats in the audio bit stream;
defining a first inter-beat interval extending between said first beat and a (k+1)th subsequent beat;
storing at least a portion of the audio bit stream occurring within said first inter- beat interval;
detecting an erroneous audio segment occurring in a second inter-beat interval extending between said (k+1)th beat and a (2k+1)th subsequent beat; and
replacing at least a first part of said erroneous audio segment with a corresponding part of said stored digital audio bit stream portion.
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Accused Products
Abstract
A system and method for the concealment of errors resulting from missing or corrupted data in the transmission of audio signals in compressed digital packet formats is disclosed. The system utilizes a circular FIFO buffer to store audio frames from the transmitted audio signal, and a beat detector, to identify the presence of beats in the audio signal. The error concealment method replaces erroneous audio frames with error-free audio frames by a process which takes into account the presence and location of the detected beats.
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Citations
18 Claims
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1. A method for concealing errors detected in an input audio bit stream, the digital audio bit stream configured as a series of packets, said method comprising the steps of:
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detecting a first beat and a subsequent plurality of beats in the audio bit stream;
defining a first inter-beat interval extending between said first beat and a (k+1)th subsequent beat;
storing at least a portion of the audio bit stream occurring within said first inter- beat interval;
detecting an erroneous audio segment occurring in a second inter-beat interval extending between said (k+1)th beat and a (2k+1)th subsequent beat; and
replacing at least a first part of said erroneous audio segment with a corresponding part of said stored digital audio bit stream portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for error concealment in a process of digital audio streaming, said method comprising the steps of:
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providing a bitstream;
detecting at least two beats extracted from said bitstream, said beats extracted from a signal having repetitive sequences; and
determining an inter-beat interval between said at least two beats. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for error concealment in a process of digital audio streaming in a wireless terminal, said method comprising the step of storing two consecutive inter-beat intervals of the compressed audio bitstream
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18. A memory for error concealment in a process of digital audio streaming in a wireless terminal, said memory comprising:
storing means for storing a signal history of musical beats of two consecutive inter-beat intervals of the compressed audio bitstream.
Specification