【信号处理】遗传算法的VST混响【Matlab 200期】

一、简介

在MATLAB中编写的VST 2音频效果插件，使用遗传算法生成描述人工房间混响的随机脉冲响应，并使用脉冲响应对信号实时应用卷积混响。还提供了一个MATLAB脚本（main.m），接受WAV音频文件作为输入。通过卷积将输入与脉冲响应结合起来，将混响效果应用于预录制的音频。由于没有任何两个脉冲响应是相同的，所以脚本和插件也可以将生成的脉冲响应保存到新文件中。

二、源代码

 
%
% BSD 3-Clause License
 
%
%% Preamble
% Clear workspace and figures
clear; close all;
 
% Add paths to any external functions used
addpath ../components
 
%% Output Parameters
NORMALIZE_AUDIO = true;    % Normalize audio after applying reverb
VERBOSE = true;            % Display genetic algorithm status messages
SHOW_FIGURES = true;       % Display figures plotting IR and output audio
 
%% Genetic Algorithm Parameters
% POPULATION_SIZE = Number of impulse responses in population
% SELECTION_SIZE = Number of impulse responses to keep in each generation
% NUM_GENERATIONS = Maximum number of generations to run in the algorithm
% PLATEAU_LENGTH = If there is no new best impulse response after some number
%     of generations, stop early
% FITNESS_THRESHOLD = If fitness value is below threshold value, stop early
% MUTATION_RATE = Probability of each sample in impulse response randomly
%     changing value in each generation
 
gaParams = struct( ...
  'POPULATION_SIZE', 50, ...
  'SELECTION_SIZE', 20, ...
  'NUM_GENERATIONS', 250, ...
  'PLATEAU_LENGTH', 50, ...
  'FITNESS_THRESHOLD', 0.001, ...
  'MUTATION_RATE', 0.001);
 
%% Impulse Response Parameters
% SAMPLE_RATE = Sample rate of impulse response (Hz)
% NUM_SAMPLES = Number of samples in IR to record / length of IR
% PREDELAY = Delay time before onset of first early reflection (samples)
% T60 = Total reverberation time (s)
% EDT = Early decay time (s)
% C80 = Clarity, or relative loudness of early reverberations over
%     late reverberations (dB)
% BR = Warmth vs. brilliance, calculated as "bass ratio" (ratio of
%     low frequency to high frequency content) (dB)
 
 
end

三、运行结果

四、备注

完整代码或者代写添加QQ912100926。
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