A method, device and storage medium for dynamically adjusting lc3 audio coding rate
An audio coding and dynamic adjustment technology, applied in speech analysis, instruments, etc., can solve the problems of waste of computing power and power consumption, increased interference of Bluetooth devices, and low compression efficiency, and achieve the effect of reducing the amount of calculation and power consumption
Active Publication Date: 2021-08-20
BEIJING BAIRUI INTERNET TECH CO LTD
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Problems solved by technology
[0002] Due to the widespread use of Bluetooth devices, the interference between Bluetooth devices has also increased, resulting in a decline in Bluetooth transmission efficiency, making it difficult to transmit voice packets at a constant bit rate during Bluetooth communication.
Moreover, LC3 uses waveform-based coding technology, which has low compression efficiency compared with traditional vocoders, and requires more transmission efficiency for Bluetooth communication.
[0003] In the prior art, the flexible design of the LC3 codec is used to solve the above problems by adjusting the code rate within the code rate range specified in the standard specification. However, although the method for reducing the code rate is simple and direct, it will lead to a large quantization gain and The quantization of spectral coefficients is rough, which eventually leads to a decrease in sound quality. Although this method reduces the bit rate, it does not change the amount of calculation, resulting in a waste of computing power and power consumption.
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[0014] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.
[0015] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or al...
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The invention discloses a method, device and storage medium for dynamically adjusting the LC3 audio encoding rate, and belongs to the technical fields of bluetooth communication, audio encoding and decoding, and digital information transmission. The method mainly includes determining the real-time frequency bandwidth of LC3 encoder encoding according to the real-time transmission rate in the LC3 audio signal transmission process; setting the index maximum value of the current sub-band index table according to the real-time frequency bandwidth, and calculating the required normal encoding according to the maximum index value and continue coding by using the spectral coefficients in the sub-band range requiring normal coding; the sub-band range requiring normal coding includes the low-frequency range or the low-frequency and mid-frequency sub-band ranges that affect the sound quality. The present invention can dynamically adjust the code rate of audio transmission without significantly reducing the audio sound quality, and at the same time, reduces the amount of calculation when adjusting the code rate, and ensures the fluency of Bluetooth audio transmission.
Description
technical field [0001] The invention relates to the technical fields of bluetooth communication, audio codec and digital information transmission, in particular to a method, device and storage medium for dynamically adjusting LC3 audio coding rate. Background technique [0002] Due to the widespread use of Bluetooth devices, the interference between Bluetooth devices has also increased, resulting in a decrease in Bluetooth transmission efficiency, making it difficult to transmit voice packets at a constant bit rate during Bluetooth communication. Moreover, LC3 uses waveform-based coding technology, which has low compression efficiency compared with traditional vocoders, and requires more transmission efficiency for Bluetooth communication. [0003] In the prior art, the flexible design of the LC3 codec is used to solve the above problems by adjusting the code rate within the code rate range specified in the standard specification. However, although the method for reducing th...
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IPC IPC(8): G10L19/24
CPCG10L19/24
Inventor 李强王尧叶东翔朱勇
Owner BEIJING BAIRUI INTERNET TECH CO LTD