Generating some sounds and present all of the sound randomly to left and right ear

Hello every body, I generate 45 sounds and put all of the in a cell array(5*3*3)and right now I want present all of sounds in left and right ear randomly but I can not. I mean all of sounds should select one time as well as randomly. please help me if you know it. (Thanks in advance).

here is my code that I wrote:

I have problem in line (30)

%%line 30 %% In  this part I have problem, I want to present all of sounds that are inside the memory to left and right randomly as well as without repetition and all sounds should be select.

clear;
clc;
close all;
SamplingRate_Hz=48000;
F=[250 500 1000 2000 4000];
A=[5 10 15];
T=[1 2 3];
memoryR{1,1}{1,1}{1,1}=0;
memoryL{1,1}{1,1}{1,1}=0;
memory{1,1}{1,1}{1,1}=0;
for i=1:length(F)
for j=1:length(T)
for k=1:length(A)
    Frequency_Hz = F(1,i);
      time_p = T(1,j);
    Amplitude = A(1,k);
   t=0:(1/SamplingRate_Hz):(time_p-1/Frequency_Hz);
   y=Amplitude*sin(2*pi*Frequency_Hz*t);
   xt_ramped = toneburst(SamplingRate_Hz,y);
   OutR = [zeros(size(t)); xt_ramped]';    % Right
   OutL = [ xt_ramped ;zeros(size(t))]';  % Left
   %%Right
   memoryR{1,i}{1,j}{1,k} = OutR;
   %%left
   memoryL{1,i}{1,j}{1,k} = OutL;     
end
end
end


%% In  this part I have problem, I want to present all of sounds that are inside the memory to left and right randomly as well as without repetition and all sounds should be select.
memory={memoryL memoryR}; 
%%

%% here is my function(toneburst)
function xt_ramped = toneburst(SamplingRate_Hz,y)
xt =y;
fs=SamplingRate_Hz;
ramp_dur=0.0025; %ramp duration in seconds  
%setup ramp
rampSamps = floor(fs*ramp_dur);
window=hanning(2*rampSamps)'; %hanning window is cosine^2 this will change depending on the kind of ramp you want
w1=window(1:ceil((length(window))/2)); %use the first half of hanning function for onramp
w2=window(ceil((length(window))/2)+1:end); %use second half of hanning function of off ramp
w_on_xt = [w1 ones(1,length(xt)-length(w1))];
w_off_xt = [ones(1,length(xt)-length(w2)) w2];
xt_ramped = xt.*w_on_xt.*w_off_xt; 
end

PLEASE HELP ME EVERYBODY

[Mathieu NOE]

hello

there is one first point that surprises me ; I believe the goal is to have at the end 45 sections of 2 channels audio and play them randomly (does the R and L channels be played randomly independently ? they have anyway to be of same time length...

now I don't understand in your code why OutR and OutL have already 2 channels (their dimension is length(t) , 2 ) .

I would guess that they should be only 1 channel data and then you combine both to make your stereo audio ?

Answer 1

[Mathieu NOE]

hello again

we need to clarify a bit the data you generate (see my comment above) , but basically this is your code a bit modified to generate a stream of the 45 individual sounds put together in a random manner

so we are quite close to your goal , just precise how the right and left audio data should be organized as for the time being I believe we have to much channels ( 2 x 2 insted of simply 2 )

clearvars;
clc;
SamplingRate_Hz=48000;
F=[250 500 1000 2000 4000];
A=[5 10 15]/15; % amplitude should be +/- max for wav export
T=[1 2 3];
% memoryR{1,1}{1,1}{1,1}=0;
% memoryL{1,1}{1,1}{1,1}=0;
% memory{1,1}{1,1}{1,1}=0;

ind = 0;
for i=1:length(F)
for j=1:length(T)
for k=1:length(A)
    ind = ind + 1; 
    Frequency_Hz = F(i);
    time_p = T(j);
    Amplitude = A(k);
   t=0:(1/SamplingRate_Hz):(time_p-1/Frequency_Hz);
   y=Amplitude*sin(2*pi*Frequency_Hz*t);
   xt_ramped = toneburst(SamplingRate_Hz,y);
   OutR = [zeros(size(t)); xt_ramped]';    % Right
   OutL = [ xt_ramped ;zeros(size(t))]';  % Left
%    %%Right
%    memoryR{1,i}{1,j}{1,k} = OutR;
%    %%left
%    memoryL{1,i}{1,j}{1,k} = OutL;   
   
      %%Right
   memoryR{1,ind} = OutR;
   %%left
   memoryL{1,ind} = OutL; 
end
end
end
% %% In  this part I have problem, I want to present all of sounds that are inside the memory to left and right randomly 
% as well as without repetition and all sounds should be select.
% memory={memoryL memoryR}; 
% %%
r = randperm(ind); % create 45 random values 
out_all = [];
for ci = 1:ind
    out_all = [out_all; memoryR{1,r(ci)}];
end

% export to wav
audiowrite('testR.wav',out_all,SamplingRate_Hz);

%% here is my function(toneburst)
function xt_ramped = toneburst(SamplingRate_Hz,y)
xt =y;
fs=SamplingRate_Hz;
ramp_dur=0.0025; %ramp duration in seconds  
%setup ramp
rampSamps = floor(fs*ramp_dur);
window=hanning(2*rampSamps)'; %hanning window is cosine^2 this will change depending on the kind of ramp you want
w1=window(1:ceil((length(window))/2)); %use the first half of hanning function for onramp
w2=window(ceil((length(window))/2)+1:end); %use second half of hanning function of off ramp
w_on_xt = [w1 ones(1,length(xt)-length(w1))];
w_off_xt = [ones(1,length(xt)-length(w2)) w2];
xt_ramped = xt.*w_on_xt.*w_off_xt; 
end

[mohadeseh zamani]

Hello Mathieu, at first thanks a lot for answering. second if I want to clarify about this program we have 90 sound overall(45 sounds belong to left and 45 sounds belong to right ) and right now we want present all sounds randomly not only just right channels present randomly independently . in this modified code that you have written, left and right should be mix as well as duration between each sounds for presenting is 3 second. do you know it?

[mohadeseh zamani]

hello again Mathieus;

I found a solution for my program, you really helped me thanks a zillion.

[Mathieu NOE]

hello

Glag I could be of some help

have a good day !