Patent ID: 11894007
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 1:
2. The method of claim 1, wherein determining whether the current frame lacks the low-frequency energy comprises:
determining a first maximum energy of the current frame in a first frequency region from zero to a predetermined minimum frequency;
determining a second maximum energy of the current frame in a second frequency region from the predetermined minimum frequency to a predetermined maximum frequency;
calculating an energy ratio of the current frame between the first maximum energy and the second maximum energy;
adjusting the energy ratio using an average normalized pitch correlation of the current frame to obtain an adjusted energy ratio;
calculating a smoothed energy ratio of the current frame using the adjusted energy ratio; and
determining the current frame lacks the low-frequency energy when the smoothed energy ratio is greater than a first threshold or the adjusted energy ratio is greater than a second threshold.