Method and device for dynamically adjusting LC3 audio coding rate and storage medium

Abstract

The invention discloses a method and device for dynamically adjusting an LC3 audio coding rate and a storage medium, and belongs to the technical field of Bluetooth communication, audio coding and decoding and digital information transmission. The method mainly comprises the following steps: determining a real-time frequency band width coded by an LC3 encoder according to a real-time transmission rate in an LC3 audio signal transmission process; setting an index maximum value of the current sub-band index table according to the real-time frequency band width, and calculating and obtaining a sub-band range needing normal coding according to the index maximum value; and continuing to code by using the spectrum coefficient in the sub-band range which needs to be normally coded, wherein the sub-band range needing normal coding comprises a low-frequency band or low-frequency band and intermediate-frequency band sub-band range influencing tone quality. According to the method and the device, the code rate of audio transmission can be dynamically adjusted under the condition that the audio quality is not obviously reduced, meanwhile, the calculation amount during code rate adjustment is reduced, and the fluency of Bluetooth audio transmission is ensured.

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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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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