A method for synthesizing and adjusting multi-channel audio
A multi-channel audio and volume adjustment technology, applied in the field of multi-channel audio synthesis and adjustment, can solve problems such as precision overflow and sound destruction, and achieve the effect of fast volume and sound effect adjustment.
Active Publication Date: 2019-01-25
BEIJING KUWO TECH
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[0005] In the process of multi-channel audio mixing, precision overflow is prone to occur when audio is superimposed, and the sound is destroyed
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[0035] The present invention will be further described in detail below in conjunction with the drawings.
[0036] First, let's briefly analyze digital volume adjustment and multi-channel audio synthesis.
[0037] Digital volume adjustment is to increase or decrease the value of sampled audio to change the loudness of the sound. If it is a simple linear change (see figure 1 ), it is easy to cause sudden changes in the volume, which sounds very dissonant. The present invention uses logarithmic equation changes (see figure 2 ), the purpose is to get a more harmonious sound effect.
[0038] Multi-channel audio synthesis is to superimpose multiple channels of audio sampled to obtain one channel of audio. If it is a simple addition and superposition, it is easy to cause accuracy overflow and destroy the sampled data. Compared with the original audio sample data point (such as 16 bits), the present invention uses more bits (such as 32 bits) to represent a sample data point. After the mi...
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The invention relates to a method for synthesizing and adjusting multichannel audio. The method comprises the following steps: sampling multichannel audio data as original audio, wherein each channel of audio data contain a plurality of sampling points; setting a logarithmic equation of volume adjustment; respectively substituting the sampling points in each channel of audio data into the logarithmic equation one by one, thus finally obtaining multichannel audio data subjected to volume adjustment; setting an initial value of an attenuation factor f, and setting a maximum value (max) and a minimum value (min) of audio precision; starting to perform adding overlay from a first sampling point to obtain a sampling point overlap output (out); calculating a value of out*f, correspondingly adjusting a value of the attenuation factor f and an value of out, and sequentially processing all the sampling point behind the first sampling point according to the above manner, thus finally finishing audio mixing of all the sampling points. According to the method disclosed by the invention, smooth synthesis of the multichannel audio can be realized, smooth adjustment of volume can be realized, the speed of adjusting a sound effect is high, and smooth and harmonious sound is obtained.
Description
Technical field [0001] The invention relates to the technical field of audio synthesis and volume adjustment, in particular to a method for multi-channel audio synthesis and adjustment. Background technique [0002] The audio data in the computer is digital audio data, which is a digital signal obtained by sampling a continuous analog sound signal in the natural world. Therefore, digital audio data has a precision range. A sample of audio is represented by several bits, which is called sampling precision and also called bit-depth. The commonly used bit depth is 16bit, that is, 16bit expresses a sample. In this way, the highest signal-to-noise ratio can be expressed as 20log(2^16)=96db, and with 24bit bit depth, the highest signal-to-noise ratio can reach 20log(2^24 )=144db. Professional digital audio processing software actually uses a float type to represent a sample, that is, 32bit, then the highest signal-to-noise ratio can reach 193db, which is already very high. In the pr...
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IPC IPC(8): H04R3/00G06F3/16
CPCG06F3/167H04R3/00H04R2430/00
Inventor 张世洋
Owner BEIJING KUWO TECH