After playing a bit today, I decided to use Matlab to do sound data creation, as the original time series is created with it. I created a 2-column vector (left and right channel, respectively) of the data, and using the wavwrite command, outputted to a wav file at a given frequency and bit-rate. I then brought this into Audacity to further process it. A code is below, which creates some data, and then performs these operations, for those interested:
%% musicode
%% Ben Jordan
%% Constants
% standard pitch scales and ratio
a4am=440; % Hz, A4 American Standard Pitch
a4in=435; % Hz, A4 International Standard Pitch
c4jt=256; % Hz, C4 Just Intonation
a1=55; % Hz, A1
fac=2^(1/12); % ratio between two successive pitches
Fs=8000; % Hz, sampling rate
T=1/Fs; % Sampling period
b=16; % b-bit sound
noct=1; % number of octaves to span
nstp=12; % number of steps in each octave
vfl=[]; % vector for left sound data
vfr=[]; % vector for right sound data
%% Generate the vector of sound info
% starting with a1=55 Hz, make vectors of pitch 1 second long
pt=a1; %starting pitch
x=linspace(0,1,Fs); % vector of sample points
for oct=1:1:noct
for st=1:1:nstp
vl=sin(2piptx);
vl=vl’;
vr=cos(2piptx);
vr=vr’;
vfl=cat(1,vfl,vl);
vfr=cat(1,vfr,vr);
pt=pt*fac; % go up by 1 step each iteration
end
end
%% Effects
vfr=wrev(vfr); %reverse the right channel
vf=cat(2,vfl,vfr); %make two channels into stereo 2-column vector
vf=vf*.9999; % scale to avoid truncation at 1 and -1
%% Process
figure
plot(vfr); % plot the sound wave
title(‘Left channel’);
figure
plot(vfl); % plot the sound wave
title(‘Right channel’);
%% Save to file
wavwrite(vf,Fs,16,strcat(‘musicode-Fs’,num2str(Fs),‘-noct’,num2str(noct),…
‘-nstp’,num2str(nstp),‘.wav’));