Decoding method and device for audio signal

• Main Authors: CHEN ZHE, YANG LEI, ZHANG DEMING, DAI JINLIANG
• Format: Patent
• Language: Chinese; English
• Published: 06.05.2009
• Subjects: ACOUSTICS; MUSICAL INSTRUMENTS; PHYSICS; SPEECH ANALYSIS OR SYNTHESIS; SPEECH OR AUDIO CODING OR DECODING; SPEECH OR VOICE PROCESSING; SPEECH RECOGNITION

The invention discloses a decoding method for audio signals, which comprises the following steps: obtaining information for the lower band signal component and the higher band signal component of the audio signal when the received audio signal corresponding to the encoded code stream is switched from a narrower bandwidth to a wider bandwidth; conducting a frequency-domain shaping to the information of the higher band signal component and obtaining a higher band signal component; and synthesizing the higher band signal component and the lower band signal component. The invention also discloses a decoding device for audio signals and a frequency-domain shaping method for the component information of audio signals. The invention enables audio signals to satisfy the characteristics of gradual change when switched from a narrower bandwidth to a wider bandwidth by conducting a frequency-domain shaping to the information of the higher band signal component of the audio signal, thereby improving the human auditory co