Stereo Convolution Reverb (VST audio plugin)

Dear everyone

I am trying to generate vst, simple convolution reverb.

What is wrong?

    classdef Stereo_Convolver_Basic < audioPlugin

        properties (Constant)
            % audioPluginInterface manages the number of input/output channels
            % and uses audioPluginParameter to generate plugin UI parameters.
            PluginInterface = audioPluginInterface(...
                'InputChannels',2,...
                'OutputChannels',2,...
                'PluginName','Stereo Convolver'...
                );
            IR = audioread('./IR/st_georges_far.wav');
            PartitionSize = 1024;
        end

        properties(Access = private)
            pFIR_L = dsp.FrequencyDomainFIRFilter('Numerator', plugin.IR(:,1).', ...
                    'PartitionForReducedLatency', true, 'PartitionLength', plugin.PartitionSize);
            pFIR_R = dsp.FrequencyDomainFIRFilter('Numerator', plugin.IR(:,2).', ...
                    'PartitionForReducedLatency', true, 'PartitionLength', plugin.PartitionSize);
        end

        methods
            function y = process(plugin,u)
                x = u(:,1)+u(:,2);
                x = x * 0.5;
                yL = step(plugin.pFIR_L,x);
                yR = step(plugin.pFIR_R,x);
                y = [yL,yR];

            end
        end
    end

[Satoshi Suzuki]

This is the Error Message

Error using audio.ui.AudioTestBenchModel/setupSUT
Input to audioTestBench must be a valid class on the MATLAB path.

Error in audio.ui.AudioTestBenchModel

Error in audioTestBench (line 73)
        singleInstance =
        audio.ui.AudioTestBenchModel(plugin,inputname(1));

Answer 1

[jibrahim]

Hi Satoshi,

You can't set your FIR filters in the private properties block like that. One way to do this is to set them in an object constructor instead:

classdef Stereo_Convolver_Basic < audioPlugin
        properties (Constant)
            % audioPluginInterface manages the number of input/output channels
            % and uses audioPluginParameter to generate plugin UI parameters.
            PluginInterface = audioPluginInterface(...
                'InputChannels',2,...
                'OutputChannels',2,...
                'PluginName','Stereo Convolver'...
                );
            IR = audioread('./IR/st_georges_far.wav');
            PartitionSize = 1024;
        end
        properties(Access = private)
            pFIR_L
            pFIR_R 
        end
        methods
            
            function plugin = Stereo_Convolver_Basic
                plugin.pFIR_L = dsp.FrequencyDomainFIRFilter('Numerator', plugin.IR(:,1).', ...
                    'PartitionForReducedLatency', true, 'PartitionLength', plugin.PartitionSize);
                plugin.pFIR_R = dsp.FrequencyDomainFIRFilter('Numerator', plugin.IR(:,2).', ...
                    'PartitionForReducedLatency', true, 'PartitionLength', plugin.PartitionSize);
            end
            
            function y = process(plugin,u)
                x = u(:,1)+u(:,2);
                x = x * 0.5;
                yL = step(plugin.pFIR_L,x);
                yR = step(plugin.pFIR_R,x);
                y = [yL,yR];
            end
        end
    end