Sound mixing method and device of audio signal

An audio signal and sound mixing technology, applied in the field of audio signal mixing and audio signal mixing devices, can solve the problems of volume clipping, sound clipping distortion, etc., and achieve the effect of avoiding clipping problems.

Active Publication Date: 2013-03-13
CHINA DIGITAL VIDEO BEIJING
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Problems solved by technology

[0006] The problem in the above prior art is that the maximum volume intensity of the audio signal is related to the number of sampling bits. After simply superimposing the volume intensity of each sampling point in the audio signal, the volume intensity is likely to exceed what the number of sampling bits can carry. The maximum volume intensity, the excess volume will be flattened, resulting in the problem of sound clipping and distortion

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Embodiment Construction

[0044] In order to make the above objects, features and advantages of the present application more obvious and comprehensible, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0045] In the prior art, whether it is the direct superposition method adopted by Soundtrack, or the method of first reducing 3dB and then direct addition adopted by Adobe Audition, when two audio signals are mixed, the volume intensity of the mixed audio signal is likely to be It will exceed the maximum volume intensity that the number of sampling bits can carry. Assuming that the number of sampling bits of the two original signals is 16 bits, the maximum volume intensity that can be carried is 32768, and the sampling values ​​corresponding to a certain moment t are A1=22000, A2=28000, and the mixed sound obtained by using the above two schemes The sampling values ​​of the signal at time t are 35355 and...

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Abstract

The embodiment of the invention provides a sound mixing method and device of an audio signal. The sound mixing method comprises the following steps of: in two paths of audio signals to be mixed, extracting two sampling points corresponding to the same sampling time; matching sample point data of the two sampling points with preset mixing conditions, determining a corresponding mixing mode according to the matched mixing condition; determining a corresponding mixing balance parameter m in the mixing mode according to the number of sampling digits of the sampling points; and according to the matched mixing mode and the corresponding mixing balance parameter, mixing the two sampling points. According to the invention, the problem of clipping can be avoided when audio signals are mixed.

Description

technical field [0001] The embodiment of the present invention relates to the field of audio technology, in particular to an audio signal mixing method and an audio signal mixing device. Background technique [0002] Audio mixing (Audio Mixing) is an important step in music production, which is to integrate audio signals from multiple sources into a stereo track or a mono track, and play them together after mixing. [0003] At present, when mixing multiple audio signals, the volume intensity of each sampling point in the audio signal is usually simply superimposed directly. Taking the mixing of two audio signals as an example, assume that A1 and A2 are two monophonic In the prior art, there are specifically the following two mixing methods: [0004] 1. Mix(A1, A2)=(A1+A2), where A1 and A2 respectively represent the sampling values ​​of the two original audio signals, and Mix(A1, A2) represents the output signal obtained by mixing A1 and A2. The method is to directly superi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/008
Inventor 徐岱苏文涛
Owner CHINA DIGITAL VIDEO BEIJING
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