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Special sound effect flanged treatment system based on subband decomposition

A technology of sub-band decomposition and processing system, applied in instruments, electro-acoustic instruments, etc., can solve the problem of not considering frequency domain factors and affecting the effect of flanging processing.

Active Publication Date: 2012-06-27
SUZHOU DACHENG YOUFANG DATA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional full-time-domain flanger processing will affect the final flanger processing effect because the frequency domain factors are not considered

Method used

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  • Special sound effect flanged treatment system based on subband decomposition
  • Special sound effect flanged treatment system based on subband decomposition
  • Special sound effect flanged treatment system based on subband decomposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Simulation experiment digital sampling frequency F s =22.05kHz, each sampling data encoding length is 16bit. The sound range is divided into three ranges: low, middle and high by using an orthogonal mirror filter bank, and the corresponding frequency bands are 0-2.75625kHz, 2.75625-5.5125kHz and 5.5125-11.025kHz respectively. Referring to G.722, the 24th-order FIR filter is selected as the prototype filter of the dual-channel analysis filter. figure 2 Medium H 1 (z) and B 1 The coefficients of (z) are given in Table 1, and the coefficients of other filters can be given by H 1 (z) and B 1 The coefficient of (z) is calculated by the design formula of the quadrature mirror filter bank. In this system, experiments were carried out on a mixed signal composed of three single-frequency sinusoidal signals located in the low, middle and high range frequencies of 300Hz, 3000Hz and 10kHz respectively.

[0038] Table 1 Analysis Prototype Filter Coefficients

[0039]

[0...

Embodiment 2

[0042] In this embodiment, the output of flanger processing in different sound ranges is independently adjusted by setting the scanning frequency or range of the delayed modulation wave in different sound ranges. Figure 4 The spectrogram of independently adjusting the output of middle-range flanger processing by selecting the delay modulation wave parameters of middle-range signal flanger processing is given. Figure 4 Among them, the low-range and high-range flanger processing parameters of the three sub-images are given in Table 2; the middle-range flanger processing gain factors of the three sub-images are the same as a 1 = 1.0, a 2 =2.0 (the gain factor is only amplified here to make the experimental results clearer), and the rest of the parameters are given in Table 3. Comparing Figures (a) and (b), it can be seen that by changing the scanning frequency F, the size of the edge components output by the flanger processing can be changed. Comparing Figures (b) and (c), it...

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Abstract

The invention relates to a special sound effect flanged treatment system based on subband decomposition. The system comprises a first quadrature mirror filter bank, a second quadrature mirror filter bank, an extraction treatment unit, an interpolation treatment unit, a first flanging treatment unit, a second flanging treatment unit and a third flanging treatment unit, and each filter bank comprises an analytical filter unit and a comprehensive filter unit, wherein the analytical filter unit comprises a corresponding high-pass filter G1(z) or G2(z) and a low-pass filter H1(z) or H2(z), and thecomprehensive filter unit comprises a corresponding high-pass filter K1(z) or K2(z) and a low-pass filter B1(z) or B2(z). In the system, an input signal x(nT) is decomposed into a low vocal range, a middle vocal range and a high vocal range through the analytic filter units of the two filter banks and respectively sent to corresponding flanging treatment units for flanging treatment, the three vocal ranges subjected to the flanging treatment are combined into one path of output signal y(nT) through the comprehensive filter units of the two filter banks, and working rate can be decreased through extraction and interpolation treatment before the middle vocal range and the low vocal range are decomposed and after the middle vocal range and the low vocal range are combined. Therefore, flanging treatment effect is effectively improved through the division of the vocal range and the independent flaming treatment of each vocal range.

Description

technical field [0001] The invention relates to digital sound effect processing technology, in particular to a processing system for special sound effect flanger based on sub-band decomposition. Background technique [0002] Digital sound effect is a process of artificially enhancing, filtering, modulating and reprocessing the collected digital audio signal. Through the sound effect processing of the original sound, various virtual spaces or special timbres with hallucinatory colors can be produced to enhance the auditory effect. As a special sound effect, flanging can bring a periodic shifting auditory effect to the original sound, and is widely used in the sound effect processing of electric guitar and rock music. [0003] Flanger processing is actually a comb filter effect produced by delaying the audio signal and superimposing it on the original signal. At present, the modulation mode is commonly used in flange processing, that is, the delay time of the audio signal is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10H1/06
Inventor 陈建平吉晓东刘维富顾翔周婧洁
Owner SUZHOU DACHENG YOUFANG DATA TECH CO LTD