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.