Partial spectral loss concealment in transform codecs
First Claim
1. A frequency-domain error concealment method for information represented, on a frame-by-frame basis, by coding coefficients of a number of frequency bins, wherein said method comprises the steps of:
- receiving information representative of an erroneous coding coefficient being detected for a certain frequency bin in a frame; and
concealing said erroneous coding coefficient for said frequency bin in said frame by exploiting coding coefficient correlation in both time and frequency, wherein said step of concealing said erroneous coding coefficient comprises the steps of;
estimating a new coding coefficient of said frequency bin in said frame at least partly based on at least one coding coefficient of at least one other frequency bin in said frame and at least one coding coefficient of the same frequency bin in at least one other frame; and
replacing said erroneous coding coefficient by said new coding coefficient.
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Abstract
The invention concerns a frequency-domain error concealment technique for information that is represented, on a frame-by-frame basis, by coding coefficients. The basic idea is to conceal an erroneous coding coefficient by exploiting coding coefficient correlation in both time and frequency. The technique is applicable to any information, such as audio, video and image data, that is compressed into coding coefficients and transmitted under adverse channel conditions. The error concealment technique proposed by the invention has the clear advantage of exploiting the redundancy of the original information signal in time as well as frequency. For example, this offers the possibility to exploit redundancy between frames (inter-frame) as well as within frames (intra-frame). The use of coding coefficients from the same frame as the erroneous coding coefficient is sometimes referred to as intra-frame coefficient correlation and it is a special case of the more general frequency correlation.
129 Citations
28 Claims
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1. A frequency-domain error concealment method for information represented, on a frame-by-frame basis, by coding coefficients of a number of frequency bins, wherein said method comprises the steps of:
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receiving information representative of an erroneous coding coefficient being detected for a certain frequency bin in a frame; and concealing said erroneous coding coefficient for said frequency bin in said frame by exploiting coding coefficient correlation in both time and frequency, wherein said step of concealing said erroneous coding coefficient comprises the steps of; estimating a new coding coefficient of said frequency bin in said frame at least partly based on at least one coding coefficient of at least one other frequency bin in said frame and at least one coding coefficient of the same frequency bin in at least one other frame; and replacing said erroneous coding coefficient by said new coding coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A frequency-domain error concealment arrangement for information represented, on a frame-by-frame basis, by coding coefficients of a number of frequency bins, wherein the arrangement comprises electronic circuitry configure to:
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receive information representative of an erroneous coding coefficient being detected for a certain frequency bin in a frame, and conceal said erroneous coding coefficient for said frequency bin in said frame based on coding coefficient correlation in both time and frequency by estimating a new coding coefficient of said frequency bin in said frame at least partly based on at least one coding coefficient of at least one other frequency bin in said frame and at least one coding coefficient of the same frequency bin in at least one other frame and replacing said erroneous coding coefficient by said new coding coefficient. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A decoder having a frequency-domain error concealment arrangement for information represented, on a frame-by-frame basis, by coding coefficients of a number of frequency bins, wherein said frequency-domain error concealment arrangement comprises:
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means for receiving information representative of an erroneous coding coefficient being detected for a certain frequency bin in a frame; and means for concealing said erroneous coding coefficient for said frequency bin in said frame based on coding coefficient correlation in both time and frequency, wherein said means for concealing said erroneous coding coefficient comprises; means for estimating a new coding coefficient of said frequency bin in said frame at least partly based on at least one coding coefficient of at least one other frequency bin in said frame and at least one coding coefficient of the same frequency bin in at least one other frame; and means for replacing said erroneous coding coefficient by said new coding coefficient.
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28. A receiver having a frequency-domain error concealment arrangement for information represented, on a frame-by-frame basis, by coding coefficients of a number of frequency bins, wherein said frequency-domain error concealment arrangement comprises:
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means for receiving information representative of an erroneous coding coefficient being detected for a certain frequency bin in a frame; and means for concealing said erroneous coding coefficient for said frequency bin in said frame based on coding coefficient correlation in both time and frequency, wherein said means for concealing said erroneous coding coefficient comprises; means for estimating a new coding coefficient of said frequency bin in said frame at least partly based on at least one coding coefficient of at least one other frequency bin in said frame and at least one coding coefficient of the same frequency bin in at least one other frame; and means for replacing said erroneous coding coefficient by said new coding coefficient.
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Specification