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Digital audio frequency reverberation simulation system

A technology of digital audio and analog systems, applied in the direction of sound-generating instruments, instruments, electro-acoustic musical instruments, etc., to achieve the effect of good audio conditions

Inactive Publication Date: 2006-01-11
VIMICRO CORP
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Problems solved by technology

[0020] The purpose of the present invention is to overcome the defect of artificial reverberation model method in the prior art, propose a kind of artificial reverberation model using nested all-pass filter, use For the realization of digital audio reverberation analog system

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  • Digital audio frequency reverberation simulation system

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Embodiment Construction

[0045] The digital audio reverberation simulation system of the present invention is realized by nesting all-pass filters. Different from the method of cascading filters, the nested all-pass filter is to nest multiple all-pass filters together from the inside out, such as Figure 6 shown.

[0046] Figure 6 is a schematic diagram illustrating a nested all-pass filter, and the whole is a nested all-pass filter H(z), whose external feedback factor is g. The middle delay part is an all-pass filter F(z), and the all-pass filter F(z) itself may also be nested, so it is called a nested all-pass filter. When the all-pass filter F(z) is a single all-pass filter, H(z) is called a nested all-pass filter.

[0047] F(Z) is a normal all-pass filter or a normal all-pass filter plus some delay.

[0048] The input signal enters the adder Σ1, the output of the adder Σ1 is connected to the all-pass filter F(z), the output of the all-pass filter F(z) and the output of the input signal through ...

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Abstract

A digital audio mixed sound analog system includes one or many cascade all-pass filters, among which, at least one is a nested all-pass filter, a low-pass filter for feeding back the signal output by a last filter to the input of said audio mixed sound analog system, an input adder for adding up the input and feedback signals passing through said low-pass filter, an output adder for adding up its output signals and outputting audio mixed sound signals. This invention puts forward different composition plans of filters against different rooms and simulates audio mixed sound effect of different room areas effectively.

Description

technical field [0001] The present invention relates to audio simulation technology, in particular to digital audio simulation technology. Background technique [0002] Reverberation is a common acoustic phenomenon in people's lives. Whether listening to a lecture in a large classroom or enjoying music in a concert hall, we will obviously feel the presence of reverberation sound. In an acoustic environment, in addition to directly reaching the human ear, a sound source also has a part to be reflected to the human ear through obstacles around the human body. The direct sound and the reflected sound are superimposed to form reverberation. So as long as there are obstacles around the human body, such as office walls, walls of buildings on the street, etc., reverberation will occur. [0003] There are two kinds of reverberation and reverberation in the emission sound. Although both reverberation and reverberation are related to the reflection of sound waves, the reverberation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10H1/00G10K15/12
Inventor 林中松怀千江
Owner VIMICRO CORP
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