Error concealment method and apparatus of audio signals

Details Error concealment method and apparatus of audio signals Error concealment method and apparatus of audio signals

1995-12-20

1997-09-30

MacDonald, Allen R.

Excavating

395 274, 395 237, 395 214, 395 215, 371 4, 371 7, G10L 502, G10L 300

Patent

active

056733631

ABSTRACT:
An apparatus for concealing a frame or multiple of frames where errors have occurred in a digital audio signal which is subband coded and transform coded in units of an error-correctable frame is described. The error concealment apparatus includes an error detector for receiving frequency coefficients representing the encoded digital audio signal and detecting whether an error has occurred for each frame, and a decoder for decoding the frequency coefficients by respective subbands to form a frequency domain of the whole audio signal with respect to the input frequency coefficients. A buffer stores the frequency coefficients decoded by said decoder. Frequency coefficients of a frame or multiple of frames where errors have occurred are reconstructed using predetermined weight values and frequency coefficients of adjacent frames which do not have errors. Once reconstructed, the newly constructed frequency coefficients of the error frames are stored in the buffer also as to update the decoded coefficients stored therein corresponding to the error frames. The contents of the buffer are sent to a synthesis filter bank for converting the frequency coefficients into an audio signal of a time domain, in the same sequence as a decoding sequence.

REFERENCES:
Plenge et al, Combined Channel Coding and Concealment, IEE Colloquiem Feb. 17, 1993.
Muller and Wachter, A Codec Candidate for the GSM Half Rate Speech, ICASSP Apr. 19, 1994.

Affiliated with

Also associated with

Rating

Error concealment method and apparatus of audio signals does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Error concealment method and apparatus of audio signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Error concealment method and apparatus of audio signals will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2263098