Method for switching audio encoder

An audio encoder and audio technology, applied in code conversion, instrumentation, voice analysis, etc., can solve the problems of unused encoding quality, difficulty in optimizing the combination of core encoders, and inaccurate switching, so as to improve accuracy efficiency, reduce design cost, and overcome the effect of large amount of calculation

Inactive Publication Date: 2008-07-16
TSINGHUA UNIV
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Problems solved by technology

The calculation amount of this method is much lower than that of the closed-loop method, and it is more suitable for mobile communication applications. However, due to its ina

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  • Method for switching audio encoder
  • Method for switching audio encoder

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] The hybrid audio encoder in the embodiment of the present invention includes but is not limited to a combination of an EAAC+ encoder and an ACELP encoder, and the like. For other combinations of encoders, the technical solutions in the embodiments of the present invention are still applicable.

[0032] Referring to Fig. 1, an embodiment of the present invention provides a method for switching audio encoders, which specifically includes:

[0033] Step 101: Select a plurality of typical audio sequences from a high-quality sound effect database.

[0034] In this embodiment, 97 typical music sequences are selected, and their contents relate to various sounds such as nature, human life, machinery, traffic, synthetic sound, music, an...

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Abstract

The invention discloses an audio coder switching method which belongs to the multimedia signal processing and source encoding field. The method comprises that: a plurality of audio sequences are selected as training data; according to a preset rule and the training data, a classifier is trained; the rule is achieved by adopting a subjective tone quality evaluating method after a plurality of audio sequences are tested; when an audio signal is input, according to the trained result, the audio signal is classified by the classifier and switched to a corresponding audio coder for coding. The invention uses a subjective tone quality test result to train the classifier in order that the classifier can approach to subjective hearing and select a proper coder for switching, thereby overcoming the disadvantages of large calculating amount of an AMR-WB+closed loop switching method; compared with an AMR-WB+open loop switching method, the invention greatly improves the switching accuracy and ensures the coding quality.

Description

technical field [0001] The invention relates to the fields of multimedia signal processing and information source coding, in particular to a method for switching audio coders. Background technique [0002] With the continuous expansion of multimedia communication applications, people's requirements for the quality of multimedia data transmission are also gradually increasing. Audio and video data constitute two important components of multimedia data. From the perspective of audio transmission, people have gradually transitioned from only wishing to transmit voice on the phone to now wishing to transmit high-quality wideband audio on mobile phones, including a large amount of music. The large increase in the amount of transmission of required audio data and the limitation of communication bandwidth have become a new contradiction. Since a large amount of transmission bandwidth is also allocated to video data, it is necessary to transmit an audio signal with a larger bandwi...

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Application Information

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IPC IPC(8): G10L19/14H03M7/30G10L19/16
Inventor 窦维蓓张斌张树华夏田侯欢贾晓军
Owner TSINGHUA UNIV
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