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Digital audio frequency mixing method based on transform domain

A digital audio, transform domain technology, applied in speech analysis, sounding equipment, instruments, etc., can solve the problems of loud and small sound, unable to predict the maximum value of each frame, affecting the listening effect, etc., to achieve the effect of reducing the volume

Active Publication Date: 2006-05-10
BEIJING KEXIN TECH +1
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  • Claims
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Problems solved by technology

The disadvantage of this method is that the maximum value of each frame cannot be predicted, and the factors multiplied by each frame are of different sizes, resulting in the problem that the sound is sometimes loud and sometimes small, which greatly affects the listening effect.

Method used

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  • Digital audio frequency mixing method based on transform domain
  • Digital audio frequency mixing method based on transform domain
  • Digital audio frequency mixing method based on transform domain

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Embodiment Construction

[0025] A basic concept of audio signal processing is to process sound samples in units of buffers, that is, to divide the input sound samples into frames. The digitized audio signal sequence is stored in a data area sequentially. In audio signal processing, these data are generally stored in the form of a circular queue, so that a limited-capacity data area can be used to cope with a large amount of audio data (processed The audio data can be discarded in turn, so that the storage space can be stored in new data). When processing, the data is taken out from the data area by frame, and after the processing is completed, the next frame is taken out, and the cycle is repeated in turn. When fetching data, the overlapping part of the previous frame and the next frame is called frame shift (overlap). In order to ensure better continuity of the reconstructed signal, frame shifting is generally used for speech signal processing.

[0026] A frame of audio data x(n) that has been take...

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Abstract

The invention relates to a digital audio mixing method which comprises steps of: 1. inputting a plurality of digital audio flow and having frame separating processing to get time domain audio array of each frame; 2. having covering frequency domain interpolation on audio frames and getting time domain audio array of each frame frequency domain mixing audio; 3. combining the mixing audio frame data to a integral outputting audio frequency flow. Compared with present technology, the invention has the advantages of resolving the overflow issue in conventional audio mixing.

Description

technical field [0001] The invention relates to a digital audio mixing method, more specifically, to a digital audio mixing method based on transform domain. Background technique [0002] The so-called mixing is to use one output device to play multiple audio streams and provide a single-output and multiple-input channel. The current classical sound mixing methods all adopt the linear superposition method based on the time domain. [0003] Transmitting a continuous, time-critical stream of sound is different from transmitting other data. This involves the conversion of sound waves into digital signals, and the digital signals back into sound waves. While AD / DA is done by hardware, recording and playback are set by the user. It is especially important to note that, unlike typical video streams that occupy a unique position in the space / time domain, the superimposition of image elements at the same time and position is meaningless, but the human ear can perceive video playe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10H1/00G10K15/08G10L19/008
Inventor 杜云峰刘建
Owner BEIJING KEXIN TECH
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