EP2622601

• Huawei Technologies Co. Ltd.since Jul 5, 2013; EPO record ends Dec 23, 2016

A method and device for encoding a high frequency signal, and a method and device for decoding a high frequency signal are provided, which relate to encoding and decoding technology. The method for encoding a high frequency signal includes: determining the signal class of a high frequency signal of a current frame (101); smoothing and scaling the time envelopes of the high frequency signal of the current frame and obtaining the time envelopes of the high frequency signal of the current frame that require to be encoded (104), if the high frequency signal of the current frame is a NON-TRANSIENT signal and the high frequency signal of the previous frame is a TRANSIENT signal; quantizing and encoding the time envelopes of the high frequency signal of the current frame that require to be encoded, and the frequency information and the signal class information of the high frequency signal of the current frame (105). The signal class information of the TRANSIENT signal is used when the signal class information of the high frequency signal of the current frame is quantized and encoded. Therefore, the performance of the TRANSIENT signal is improved, and the deviation of the characteristics of a restored high frequency signal from the characteristics of an actual high frequency signal is reduced.

From the international application WO2011110031