Burst frame error handling
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorStefan BRUHN
Life of this patent
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Abstract
There is provided mechanisms for frame loss concealment. A method is performed by a receiving entity. The method comprises adding, in association with constructing a substitution frame for a lost frame, a noise component to the substitution frame. The noise component has a frequency characteristic corresponding to a low-resolution spectral representation of a signal in a previously received frame.
Claims15
1-26. (canceled)
A packet loss concealment method for burst error handling, the method comprising:
- determining a substitution frame spectrum based on a spectrum of a frame of a previously received audio signal;
- determining a noise component, wherein a frequency characteristic of the noise component is a spectral representation of the frame of the previously received audio signal;
- determining whether a number n of lost or erroneous frames exceeds a threshold;
- if the number n of lost or erroneous frames does not exceed the threshold, adding the noise component to the substitution frame spectrum;
- if the number n of lost or erroneous frames exceeds the threshold, applying attenuation to the noise component before adding the noise component to the substitution frame spectrum.
A decoder for packet loss concealment, the decoder comprising a processing circuitry, the processing circuitry being configured to cause the decoder to:
- determine a substitution frame spectrum based on a spectrum of a frame of a previously received audio signal;
- determine a noise component, wherein a frequency characteristic of the noise component is a spectral representation of the frame of the previously received audio signal;
- determine whether a number n of lost or erroneous frames exceeds a threshold;
- add the noise component to the substitution frame spectrum, if the number n of lost or erroneous frames does not exceed the threshold;
- apply attenuation to the noise component if the number n of lost or erroneous frames exceeds the threshold and after applying the attenuation factor, add the noise component to the substitution frame spectrum.
Dependencies are inferred from the claim text.