Method for synthesizing and adjusting multichannel audio
A multi-channel audio and volume adjustment technology, which is applied in the field of multi-channel audio synthesis and adjustment, can solve the problems of precision overflow and sound damage, and achieve the effect of fast volume and sound effect adjustment
Active Publication Date: 2017-02-01
BEIJING KUWO TECH
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Problems solved by technology
[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 described in further detail below in conjunction with the accompanying drawings.
[0036] First of all, a brief analysis of digital volume adjustment and multi-channel audio synthesis.
[0037] Digital volume adjustment is to increase or decrease the sampled audio value to change the loudness of the sound. If it is a simple linear change (see figure 1 ), it is easy to cause a sudden change in volume, which sounds very dissonant. The present invention adopts logarithmic equation change (referring to figure 2 ), the purpose is to obtain a more harmonious sound effect.
[0038] Multi-channel audio synthesis is to superimpose the multi-channel audio obtained by sampling to obtain one audio. If it is a simple addition and superposition, it is easy to cause precision overflow and destroy the sampled data. Compared with the original audio sampling data point (such as 16 bits), the present invention will use more digits (such as 32 bits) to r...
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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 multi-channel audio synthesis and adjustment method. Background technique [0002] The audio data in the computer is digital audio data, which is a digital signal obtained by sampling continuous analog sound signals in nature. Therefore, digital audio data has a precision range. A sample of audio is represented by several bits, which is called sampling precision, 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 if the 24bit bit depth is used, the highest signal-to-noise ratio can reach 20log(2^24 )=144db. Professional digital audio processing software actually uses float type to represent a sample, which is 32bit, so the highest signal-to-noise ratio can reach 193db, which is already very high. In the process of...
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Login to View More IPC IPC(8): H04R3/00G06F3/16
CPCG06F3/167H04R3/00H04R2430/00
Inventor 张世洋
Owner BEIJING KUWO TECH