Method and device for encoding a high frequency signal, and method and device for decoding a high frequency signal

摘要

A method and a device for encoding a high frequency signal, and a method and a 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 a signal class of a high frequency signal of a current frame; smoothing and scaling time envelopes of the high frequency signal of the current frame and obtaining time envelopes of the high frequency signal of the current frame that require to be encoded, if the high frequency signal of the current frame is a non-transient signal and a high frequency signal of the previous frame is a transient signal; and quantizing and encoding the time envelopes of the high frequency signal of the current frame that require to be encoded, and frequency information and signal class information of the high frequency signal of the current frame.

主权项

1. A method for decoding a high frequency signal using a decoder, the method comprising:
Obtaining, by the decoder, signal class information and frequency information of a high frequency signal of a current frame by decoding; Obtaining, by the decoder, a high frequency excitation spectrum of the current frame, determining normalization length according to the signal class of the high frequency signal of the current frame and low frequency signal information, and obtaining a normalized high frequency excitation spectrum by normalizing the high frequency excitation spectrum according to the normalization length; Modifying, by the decoder, the normalized high frequency excitation spectrum by using the frequency information, and obtaining a high frequency spectrum of the current frame; and Outputting, by the decoder, an output signal obtained by using the high frequency spectrum of the current frame.