De-quantization Audio Signal

Question

Ibnu Darajat 2019-7-8

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/470676-de-quantization-audio-signal

回答： Pavel Zaviska 2021-4-15

This my audio record code and quantization code :

%record code
Fs = 1000;
nBits = 8;
nChannels = 1;
t = 3;
recObj = audiorecorder(Fs,nBits,nChannels);
set(handles.edit4,'String','Start Record');
recordblocking(recObj,t);
set(handles.edit4,'String','Finish');
myRecording = getaudiodata(recObj);
axes(handles.axes1)
plot(myRecording);
grid on;
title('Record Signal')
set(gca, 'YLim', [-2 2])
legend('Audio Signal');
handles.Fs = Fs;
handles.myRecording = myRecording;
guidata(hObject,handles);
soundsc(myRecording, Fs);
%quantization code
normal_sound = (myRecording - min(myRecording))./(max(myRecording)-min(myRecording));
level = 255;
range = 1/level;
quantized_sound = floor(normal_sound ./ range);

My question is how to do de-quantization based on my quantization code? Thanks before

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Answer 1

Pavel Zaviska 2021-4-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/470676-de-quantization-audio-signal#answer_675801

Hi, several algorithms for Audio dequantization based on signal sparsity have been proposed in the paper "Audio Dequantization Using (Co)Sparse (Non)Convex Methods". The MATLAB source codes are freely available on Github: https://github.com/zawi01/audio_dequantization

Even though the quantization scheme used in the paper is slightly different (standard Mid-riser quantizer), the codes can be easily edited (especially the projection functions) to work for arbitrary quantization scheme, assuming that quantization levels are known.