Audio mixing method of multiple-channel audio frequency
A multi-channel audio and audio frame technology, applied in speech analysis, instruments, etc., to achieve the effect of avoiding noise
Active Publication Date: 2012-07-25
SHANGHAI AVCON INFORMATION TECH
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Problems solved by technology
Although this kind of method can solve the overflow problem well, it is difficult to realize the mixing of more than four channels, and it does not have the advantage of general application
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[0021] The method for mixing multiple audio frames of the present invention will be described in detail below with reference to the accompanying drawings. In this embodiment, it is described by taking a sound mixing device (for example, a computer) to mix 6 channels of audio, that is, audio signal 1, audio signal 2 . . . audio signal 6 as an example. Among them, audio signal 1, audio signal 2...audio signal 6 are each formed by sampling analog audio signals, that is, audio signal 1 is formed by sampling analog audio signal 1, and audio signal 2 is formed by sampling analog audio signal 2. Forming... the audio signal 6 is formed by sampling the analog audio signal 6, and the sampling of the analog audio signal 1, the analog audio signal 2...the analog audio signal 6 can be carried out based on the same sampling frequency, and when sampling, it can be The sampled data within a certain sampling time is regarded as one frame, thus, each channel of audio formed contains multiple fr...
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The invention provides an audio mixing method of a multiple-channel audio frequency frame, which comprises the following steps of, firstly, respectively superposing corresponding sampling point values the multiple-channel audio frequency frame to obtain at least one sample point data, regulating a gain factor of a current frame when a superposed result exceeds a preset range, comparing the obtained gain factor of the current frame with a gain factor of a previous frame after finishing frame superposition, and regulating the gain factor of the current frame again according to the compared result; and secondly, calculating a volume strength level of the current frame according to the gain factor of the current frame after secondary regulation and an initial value of the volume strength, judging whether the volume strength level is equal to a preset value or not, if so, taking a frame formed from each sample point data obtained after superposition as an audio mixing frame, otherwise, processing each sample point data according to the volume strength level to enable each treated sample point data to be in the preset range, and taking a frame formed from each processed sample point data as an audio mixing frame. The method has the advantages of simpleness and easy implementation.
Description
technical field [0001] The invention relates to a sound mixing method of multiple audio frames. Background technique [0002] At present, with the rapid development of video conferencing and monitoring, the application technology of video and audio has been relatively mature. In practical applications, the interactive processing of audio is still at the most basic and core position, and the real-time requirements for audio are more stringent. Therefore, for multiple terminals in different locations in actual use, if multiple points For real-time audio interaction, if the network bandwidth permits, it is necessary to mix multiple channels of audio according to a certain strategy and finally encode them to another terminal. [0003] To solve such problems, the traditional method is to use a multipoint control unit (MCU) to mix multiple channels of audio signals into one channel, which can effectively reduce the amount of network data transmission. The method of MCU mixing i...
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IPC IPC(8): G10L19/00G10L19/008
Inventor 刘睿刘晓露熊模昌张子刚
Owner SHANGHAI AVCON INFORMATION TECH