Audio amplitude limiting method and system

Abstract

The invention discloses an audio amplitude limiting method and system, and belongs to the field of digital audio signal processing and audio amplitude limiting, and the method comprises the steps: calculating an average gain value corresponding to each frame of digital audio signal according to a digital signal of a preset frame length after the digital audio signal of the preset frame length is obtained; and processing the digital audio signal with the preset frame length according to the calculated average gain value to obtain an amplitude-limited digital audio signal. Under the condition that the amplitude of the audio signals lower than the threshold value is not changed, the amplitude of the audio signals exceeding the threshold value is limited within the set threshold value range, truncated distortion is not generated, and high real-time performance is achieved. And the quality of the digital audio signal is ensured, and better experience is brought to a user.

Description

technical field [0001] The present invention relates to the field of digital audio signal processing and audio clipping, in particular, to a method and system for audio clipping. Background technique [0002] In terms of audio processing, digital audio processing technology has gradually replaced analog audio processing technology and has become the current mainstream. [0003] In the process of digital audio processing, it is often necessary to use a limiter to limit the amplitude range of the numerical audio signal. There are several reasons: 1. When processing digital audio, audio amplification, sound mixing, and volume are usually performed. Adjustment, dynamic range improvement and other operations, after these processes, the amplitude of the final digital audio signal may exceed the numerical range of digital audio; 2. It is necessary to output the digital audio signal through a digital-to-analog converter, power amplifier, and speaker. However, the high amplitude of ...

AI Technical Summary

Problems solved by technology

[0003] In the process of digital audio processing, it is often necessary to use a limiter to limit the amplitude range of the numerical audio signal. There are several reasons: 1. When processing digital audio, audio amplification, sound mixing, and volume are usually performed. Adjustment, dynamic range improvement and other operations, after these processes, the amplitude of the final digital audio signal may exceed the numerical range of digital audio; 2. It is necessary to output the digital audio signal through a digital-to-analog converter, power amplifier, and speaker. However, the high amplitude of the digital signal will lead to the overload of the power amplifier or the speaker, which will introduce harmonic components into the played sound, and at the same time reduce the service life of the power amplifier and the speaker; 3. From devices that support long bit width digital audio signals to only support Devices with short-bit-width digital audio signals transmit digital audio signals, such as digital signal processors that need to transmit 24-bit-width digital audio signals to digital-to-analog converters that only support 18-bit width

[0004] If these digital audio signals that exceed the numerical range of digital audio are simply limited in amplitude, that is, the digital audio signals that are larger than the maximum value and smaller than the minimum value are set to the maximum value and the minimum value respectively, truncated distortion will be generated, and a large number of audio signals will be introduced. The odd harmonics greatly reduce the user's sense of hearing, and at the same time have irreversible damage to the intelligibility and comfort of the audio

If the value of the audio digital audio signal is uniformly suppressed by gain, it will cause the loss of small signals and make it impossible to hear small sounds

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