Patent ID: 11862180
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A method for controlling a concealment method for a lost audio frame associated with a received audio signal, the method comprising:
decoding a first audio frame of the received audio signal to obtain modified discrete cosine transform, MDCT coefficients;
determining values of a first spectral shape based upon the MDCT coefficients decoded from the first audio frame decoded, the first spectral shape comprising a number of sub-bands;
decoding a second audio frame of the received audio signal to obtain MDCT coefficients for the second audio frame;
determining values of a second spectral shape based upon MDCT coefficients decoded from the second audio frame decoded, the second spectral shape comprising the number of sub-bands;
transforming the values of the first spectral shape and a first frame energy of the first audio frame into a first representation of a first fast Fourier transform, FFT, based spectral analysis and transforming the values of the second spectral shape and a second frame energy of the second audio frame into a second representation of a second FFT spectral analysis;
detecting, based on the first representation of the first FFT and the second representation of a second FFT, a transient condition; and
responsive to detecting the transient condition, modifying the concealment method by selectively adjusting a spectrum magnitude of a substitution frame spectrum.