crossFilt causing Matlab audio plugin pops
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Audio plugin splits incoming audio into three bands and applies gain to center band and sums all back together. Debugging by only writing out one band, continuous pop noise still occurs. Is this because the crossover filter should be done with a different method in the App?
When I do this process offline in a normal m file there is no distortion.
classdef test_process < audioPlugin
properties
LowBand = 500;
HighBand = 5000;
fs = 48000;
gain = 0;
end
properties (Constant)
PluginInterface = audioPluginInterface( ...
audioPluginParameter('LowBand','Label','Hz','Mapping',{'lin',70,1000}),...
audioPluginParameter('HighBand','Label','Hz','Mapping',{'lin',2000,10000}),...
audioPluginParameter('gain','Label','dB','Mapping',{'lin',0,20}));
end
methods
function out = process(plugin,in)
%set up crossover filter
crossFilt = crossoverFilter( ...
NumCrossovers=2, ...
CrossoverFrequencies=[plugin.LowBand,plugin.HighBand], ...
CrossoverSlopes=12, ...
SampleRate=plugin.fs);
[m1,m2,m3] = crossFilt(in); % split into three bands
%normal operation commented out for debug
% midGain = m2*(db2mag(plugin.gain)); % apply gain to mid band
% out = m1+midGain+m3; % sum three bands
%Test without any sum
out = m2; % test just mid band
end
end
end
采纳的回答
jibrahim
2024-10-4
编辑：Rena Berman
2024-10-22
Hi Matthew,
the main problem here is that you are recreating the corssover filter for every incoming frame of audio. Instead, you should create it once, in the contructor, in order to preserve the internal filter state.
You should also use getSampleRate to get the value of the plugin's sample rate instead of maintaning it as a property.
Here is a new version.
classdef test_process < audioPlugin
properties
LowBand = 500;
HighBand = 5000;
gain = 0;
end
properties (Constant)
PluginInterface = audioPluginInterface( ...
audioPluginParameter('LowBand','Label','Hz','Mapping',{'lin',70,1000}),...
audioPluginParameter('HighBand','Label','Hz','Mapping',{'lin',2000,10000}),...
audioPluginParameter('gain','Label','dB','Mapping',{'lin',0,20}));
end
properties (Access=protected)
crossFilt
end
methods
function plugin = test_process
%set up crossover filter
plugin.crossFilt = crossoverFilter( ...
NumCrossovers=2, ...
CrossoverFrequencies=[plugin.LowBand,plugin.HighBand], ...
CrossoverSlopes=12, ...
SampleRate=getSampleRate(plugin));
end
function out = process(plugin,in)
%set up crossover filter
[m1,m2,m3] = plugin.crossFilt(in); % split into three bands
%normal operation commented out for debug
% midGain = m2*(db2mag(plugin.gain)); % apply gain to mid band
% out = m1+midGain+m3; % sum three bands
%Test without any sum
out = m1+m2+m3; % test just mid band
end
function set.LowBand(plugin,val)
plugin.crossFilt.CrossoverFrequencies(1) = val;%#ok
plugin.LowBand = val;
end
function set.HighBand(plugin,val)
plugin.crossFilt.CrossoverFrequencies(2) = val;%#ok
plugin.HighBand = val;
end
end
end
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