Coding and decoding device of audio signal high frequency parameter

Abstract

The invention provides a coding and a decoding device of audio signal high frequency parameter. The coding and decoding device uses a plurality of modes to recover high frequency signals which can not pass a core layer code, thereby high frequency signals are rebuilt efficiently to improve output audio signal quality. The coding device of audio signal high frequency parameter comprises a frequency dividing module, a low frequency coding module, a time-frequency transforming module, a high frequency pumping module, a gain calculating module, a gain factor quantization module, a high frequency signal reconstructing module, a signal to noise ratio calculating module, a mode selecting module and a parameter coding module. The decoding device of audio signal high frequency parameter comprises a parameter allocation module, a low frequency decoding module, a decoding time-frequency transforming module, a high frequency pumping rebuilding module, an energy factor calculating module, a high frequency field signal rebuilding module and an inverse time-frequency transforming module.

Description

Technical field [0001] The invention belongs to the field of audio technology, and particularly relates to an audio signal high-frequency parameter encoding and decoding device. Background technique [0002] Research on the human auditory system shows that the human ear is more sensitive to low-frequency signals and can tolerate smaller quantization errors, while it is less sensitive to high-frequency signals and can tolerate larger quantization errors. This feature is widely used in audio compression technology. In the case of a limited bit rate, the audio encoder will allocate the available bits to the low frequency part and ignore the high frequency part. Since the high frequency components in the audio signal represent the fineness of the sound, the loss of the high frequency components will make the sound sound dull. It is not bright, so the high-frequency components in the audio signal are essential and important components for the high-quality audio that people seek. How...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-frequency parameter encoding and decoding device for audio signals under specific requirements for existing high-frequency signals of different types of signals, so that when digital audio is encoded and decoded, multiple modes can be used to recover high-frequency signals that cannot be encoded by the core layer , so that high-frequency signals can be efficiently reconstructed

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