Matlab Coder: Fail to call phased.Fro​stBeamform​er().

I use phased.FrostBeamformer() in my matlab code, and I want to transfer this code into c++ code through matlab coder.

The matlab coder construct phased.FrostBeamformer successfully, but fail to call this callable object.

Here are the error message and my codes:

function EnhancedAudio = AudioEnhance(OriginalAudio, BFAngle)
    % OriginalAudio: samples * channels
    InputSize = size(OriginalAudio);
	DataLength = InputSize(1);
	NumOfChannels = 5; 
    Angle = [BFAngle ; 0];
     
    microphone = phased.OmnidirectionalMicrophoneElement('FrequencyRange',[20 20e3]);
    ula = phased.ULA(NumOfChannels, 0.024, 'Element', microphone);
    c = 340;

    Beamformer = phased.FrostBeamformer(...
		'SensorArray',ula,...
		'SampleRate',16000,...
        'PropagationSpeed',c,...
		'FilterLength',30,...
		'DirectionSource','Input port'...
	); 
   
	FrameLength = 2000;
    EnhancedAudio = zeros(DataLength, 1);
    for i = 1:FrameLength:DataLength
		InvolvedAudio = OriginalAudio(i: i + FrameLength - 1, :);
        EnhancedAudio(i: i + FrameLength - 1, :) = Beamformer(InvolvedAudio, Angle);
    end

end

[Ji Lee]

Would you be able to provide the project (PRJ) file associated with this code and error?

[亚杰 颜]

Sorry for replying so lately, I tried to solve it by myself but failed.

Answer 1

[Areej Varamban Kallan]

Hi,

This is an internal error from phased.FrostBeamformer. We have made an internal note for more investigation.

Meanwhile with some changes to your function AudioEnahance.m, we can successfully generate code. Please find the modified code below.

function EnhancedAudio = AudioEnhance(OriginalAudio, BFAngle)
%#codegen
% OriginalAudio: samples * channels
InputSize = size(OriginalAudio);
DataLength = InputSize(1);
NumOfChannels = 5; 
Angle = [BFAngle ; 0];
 
microphone = phased.OmnidirectionalMicrophoneElement('FrequencyRange',[20 20e3]);
ula = phased.ULA(NumOfChannels, 0.024, 'Element', microphone);
c = 340;
Beamformer = phased.FrostBeamformer(...
	'SensorArray',ula,...
	'SampleRate',16000,...
    'PropagationSpeed',c,...
	'FilterLength',30,...
	'DirectionSource','Input port'...
); 

FrameLength = 2000;
EnhancedAudio = zeros(DataLength, 1);
InvolvedAudio = coder.nullcopy(zeros(FrameLength,size(OriginalAudio,2),'like',OriginalAudio));
for i = 1:FrameLength:DataLength
    if coder.target('MATLAB')
		InvolvedAudio = OriginalAudio(i: i + FrameLength - 1, :);
    else
        for ch = 1:FrameLength
            InvolvedAudio(ch,:) = OriginalAudio(i+ch-1,:);
        end
    end
    EnhancedAudio(i: i + FrameLength - 1, :) = Beamformer(InvolvedAudio, Angle);
end
end

Thanks,

Areej