Patent ID: 11967327
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 11:
12. A decoder device configured to generate a concealment audio subframe of an audio signal, the decoder device comprising:
processing circuitry; and
memory operatively coupled with the processing circuitry, wherein the memory includes instructions that when executed by the processing circuitry causes the decoder device to perform operations comprising:
generating frequency spectra on a subframe basis where consecutive subframes of the audio signal have a property that an applied window shape of first subframe of the consecutive subframes is a mirrored version or a time reversed version of a second subframe of the consecutive subframes;
detecting peaks of a signal spectrum of a previously received audio signal on a fractional frequency scale;
estimating a phase of each of the peaks;
deriving a phase adjustment for a time reversed concealment audio subframe to apply to the peaks of the signal spectrum based on the phase estimated;
applying the phase adjustment to the peaks of the signal spectrum to form phase adjusted peaks and to form a concealment audio subframe based on the phase adjusted peaks;
applying a time reversal to the concealment audio subframe; and
generating a synthesized concealment audio subframe based on the concealment audio subframe.