Merge branch 'main' of https://github.com/ltcptgeneral/ece45-project

README.md

@@ -57,10 +57,10 @@ where LOW, MED, HIGH are user-selected variables of any value.
  
  ## Useful websites
  
- - https://learningsynths.ableton.com
+ - [Learning Synths](https://learningsynths.ableton.com)
- - https://learningsynths.ableton.com/en/playground
+ - [Learning Synths Playground](https://learningsynths.ableton.com/en/playground)
- - https://blog.demofox.org/diy-synthesizer/
+ - [DIY Synthesisers](https://blog.demofox.org/diy-synthesizer/)
- - http://portaudio.com/
+ - [Port Audio (audio I/O library)](http://portaudio.com/)
- - https://ccrma.stanford.edu/software/stk/
+ - [Synthesis ToolKit in C++](https://ccrma.stanford.edu/software/stk/)
- - https://cycling74.com/products/max
+ - [Max](https://cycling74.com/products/max)
- - http://msp.ucsd.edu/software.html
+ - [Software by Miller Puckette](http://msp.ucsd.edu/software.html)

src/AmpEnvelope/DarellAmplitudeEnvelope.m

@@ -1,3 +1,14 @@
+%Written by Darell
+%Creates a Linear Amplitude Envelope 
+
+% CONTRIBUTORS:
+% Person1: Darell
+
+% DOCUMENTATION:
+% fs is the sampling frequency
+% attack, decay, release are in percentages of the period
+% sustain is in the percentage of amplitude
+
 function output = DarellAmplitudeEnvelope(input, Fs, attack,decay,sustain,release) %percentages for attack, decay, sustain, release
     len = length(input);
     T = (len-1)/Fs;

src/Filter/DarellbandpassFilter.m

@@ -1,3 +1,15 @@
+%Written by Darell 
+%uses fourier transform to get the series of all signals
+
+% CONTRIBUTORS:
+% Person1: Darell
+
+% DOCUMENTATION:
+% fs is the sampling frequency
+% y is the signal input
+% LOW and HIGH are used for the band of frequency
+% MEDIUM IS NOT USED
+
 function output_y = DarellbandpassFilter(y,Fs,LOW,MED,HIGH)
     Len = length(y);
     F = Fs * (-Len/2 : (Len/2 - 1))/Len ;

src/FilterSelect.m

@@ -1,10 +0,0 @@
-function output = FilterSelect(input,Fs,LOW,MED,HIGH,number)
-    if(number == "Option 1")
-        output = DarellbandpassFilter(input,Fs,LOW,MED,HIGH);
-    elseif(number == "Option 2")
-        output = amplifyFreqRange(input, Fs, LOW, MED, HIGH);
-    else
-        output = input;
-    end
-end 
-

src/Helper/Equalizer_Darell.m

@@ -0,0 +1,20 @@
+%Written by Darell 
+
+% CONTRIBUTORS:
+% Person1: Darell
+
+% DOCUMENTATION:
+% fs is the sampling frequency
+% input is the signal input
+% EQplot is the curve generated by the EQ in the app. it should look like /----\ when everthing is set to 1 
+
+
+function output = Equalizer_Darell(input,EQplot,Fs)
+%It's an EQ written by Darell
+%   Split into frequencies and multiply by EQ 
+    Mod_Freq = fftshift(fft(input));
+    filtered_Mod_Freq = fftshift(Mod_Freq .* EQplot);
+    output = real(ifft(filtered_Mod_Freq));
+    %plot(output);
+end
+

src/Helper/MIDIDarell.m

@@ -0,0 +1,92 @@
+function output = MIDIDarell(dur,Fs)
+%Darell Chua Yun Da
+%   Detailed explanation goes here
+
+    freq = [330 350 370 392 415 440 466 494 523 554];
+    charls = ["q" "w" "e" "r" "t" "y" "u" "i" "o" "p"];
+    bytedur = 0.5;
+    x =  0:1/Fs:bytedur;
+    yz0 = zeros([1,(length(x)-1)]); 
+    y = [yz0 
+        yz0 
+        yz0 
+        yz0 
+        yz0 
+        yz0 
+        yz0 
+        yz0 
+        yz0 
+        yz0];
+
+    for c = 1:length(freq)
+        for i=1:length(x)
+            y(c,i) = 0.5*sin(2*pi*freq(c)*x(i));
+        end
+    end
+    Len = dur*Fs;
+    output = zeros([1,Len]);
+
+    
+    
+    set(gcf,'CurrentCharacter', '@');
+    figure(1)
+    
+    tStart = tic;  
+    tEnd = toc(tStart);
+    figure(1)
+    
+    while(tEnd <= dur)
+        title("Midi Popup")
+        drawnow
+        char = get(gcf,'CurrentCharacter');
+        while (char == '@' && tEnd <= dur)
+            figure(1)
+            char = get(gcf,'CurrentCharacter');
+            tEnd = toc(tStart);
+            drawnow
+        end
+        
+        n = round((tEnd/dur)*Len);
+        
+        endt = tEnd + bytedur;
+        overt = tEnd + bytedur/3;
+        if overt> dur
+            endt = dur;
+        end
+        if endt > dur
+            endt = dur;
+        end
+        endn = round(endt*Fs);
+        
+        charno = 0;
+        for i=1:length(freq)
+            if char == charls(i)
+                charno = i;
+            end
+        end
+        if charno > 0
+            sound(y(charno,:),Fs); 
+            oldout = output(n:endn);
+            output(n:endn) = oldout + y(charno,1:(endn-n+1));
+            while(tEnd < overt)
+                tEnd = toc(tStart);
+                drawnow
+            end
+            figure(1)
+            plot(output);
+            title("Midi Popup")
+            drawnow
+            set(gcf,'CurrentCharacter', '@')
+        else
+            figure(1)
+            drawnow
+            set(gcf,'CurrentCharacter', '@')
+        end
+        tEnd = toc(tStart);
+    end
+    figure(1)
+    plot(output);
+    sound(output,Fs); 
+    drawnow();
+end
+

src/PitchEnvelope/DarellAnneLinearPitchEnvelope.m

@@ -0,0 +1,103 @@
+%Written by Darell and Anne
+%If there is a frequency of 200Hz:
+%1. it needs to ramp up a frequency from 0Hz to the 200Hz over the attack time
+%2. It needs to ramp down to a set sustained frequency over the decay time e.g. 160Hz < 200Hz
+%3. It maintains this 160Hz until the release time
+%4. Release time: It decays from 160Hz further all the way back to 0Hz. 
+%This envelope uses linear calculations
+
+% CONTRIBUTORS:
+% Person1: Darell
+% Person2: Anne
+
+% DOCUMENTATION:
+% fs is the sampling frequency
+% attack, decay, release are in percentages of the period
+% sustain is in the percentage of amplitude
+
+function output = DarellAnneLinearPitchEnvelope(input, Fs, attack,decay,sustain,release) %percentages for attack, decay, sustain, release
+    len = length(input);
+    T = (len-1)/Fs;
+    attacktime = attack * T * Fs;
+    decaytime = attacktime + decay * T * Fs;
+    sustaintime = (T - (release * T)) * Fs;
+    
+    output =  zeros([1,len]); 
+    
+    tcounter = 1;
+    %attack phase
+    curr = attacktime;
+    x = 1:len;
+    y = x .* 0;
+    g = x .* 0;
+    while tcounter <= curr
+        ncount = round((tcounter^2)/(2*curr)+ curr/2);
+        y(tcounter) = ncount; %For Debug Purposes
+        output(tcounter) = input(ncount);
+        tcounter = tcounter+1;
+    end
+    
+    %decay phase
+    prevcur = curr;
+    tcounter = prevcur;
+    curr = decaytime;
+    while tcounter <= curr
+      
+        t = round(tcounter-prevcur);
+        dur = round(curr-prevcur);
+        dsus = (1-sustain);
+        
+        dn = (1 - (dsus)*t/(2*dur))*t;
+        ncount = round(prevcur + dn);
+        tcounter = round(tcounter);
+        
+        y(tcounter) = ncount; %For Debug Purposes
+        output(tcounter) = input(ncount);
+        tcounter = tcounter+1;
+    end
+    hold on
+    plot(x,y)
+    plot(x,g)
+    hold off
+    %sustain phase
+    prevncount = ncount;
+    prevcur = curr;
+    tcounter = prevcur;
+    curr = sustaintime;
+    while tcounter <= curr
+        t = round(tcounter-prevcur);
+        ncount = round(sustain*(t) + prevncount);
+        tcounter = round(tcounter);
+        
+        y(tcounter) = ncount; %For Debug Purposes
+        output(tcounter) = input(ncount);
+        tcounter = tcounter+1;
+    end
+
+    %release phase
+    prevncount = ncount;
+    prevcur = curr;
+    tcounter = prevcur;
+    curr = Fs;
+    while tcounter <= curr
+        t = round(tcounter-prevcur);
+        dur = round(curr-prevcur);
+        
+        dn = (sustain - (sustain)*t/(2*dur))*t;
+        ncount = round(prevncount + dn);
+        
+        %ncount = round(prevncount + ((curr-prevcur)*(tcounter-prevcur)/(curr))*(1-log(tcounter+1-prevcur)/log(curr-prevcur)));
+        
+        %ncount = round(curr*(1-log(tcounter)/log(prevcur)) + prevncount);
+        
+        tcounter = round(tcounter);
+        y(tcounter) = ncount; %For Debug Purposes
+        if ncount > len
+            output(tcounter) = 0;
+        else
+            output(tcounter) = input(ncount);
+        end
+        tcounter = tcounter+1;
+    end
+    plot(x,y) %For Debug Purposes
+end

src/PitchEnvelope/DarellAnnePitchEnvelope.m

@@ -4,6 +4,7 @@
 %2. It needs to ramp down to a set sustained frequency over the decay time e.g. 160Hz < 200Hz
 %3. It maintains this 160Hz until the release time
 %4. Release time: It decays from 160Hz further all the way back to 0Hz. 
+%This envelope uses logarithmic calculations
 
 % CONTRIBUTORS:
 % Person1: Darell

src/Select/AmpEnvelopeSelect.m

@@ -1,3 +1,11 @@
+%Written by Darell 
+
+% CONTRIBUTORS:
+% Person1: Darell
+
+% DOCUMENTATION:
+%Pass-through function used by app
+
 function output = AmpEnvelopeSelect(input, Fs, attack,decay,sustain,release,number)
     if(number == "Option 1")
         output = DarellAmplitudeEnvelope(input, Fs, attack,decay,sustain,release);

src/Select/FilterSelect.m

@@ -0,0 +1,26 @@
+%Written by Darell 
+
+% CONTRIBUTORS:
+% Person1: Darell
+
+% DOCUMENTATION:
+%Pass-through function used by app
+
+function output = FilterSelect(input,Fs,LOW,MED,HIGH,number)
+    if(number == "Option 1")
+        output = DarellbandpassFilter(input,Fs,LOW,MED,HIGH);
+    elseif(number == "Option 2")
+        output = amplifyFreqRange(input, Fs, LOW, MED, HIGH);
+    elseif(number == "Option 3")
+        output = epic_effect_schluep(input, Fs, LOW, MED, HIGH);
+    elseif(number == "Option 4")
+        output = muffled_effect_schluep(input, Fs, LOW, MED, HIGH);
+    elseif(number == "Option 5")
+        output = seperate_prevalent_schluep(input, Fs, LOW, MED, HIGH);
+    elseif(number == "Option 6")
+        output = bandreject_filter(input, Fs, LOW, HIGH);
+    else
+        output = input;
+    end
+end 
+

src/Select/LFOSelect.m

@@ -0,0 +1,20 @@
+%Written by Darell 
+
+% CONTRIBUTORS:
+% Person1: Darell
+
+% DOCUMENTATION:
+%Pass-through function used by app
+
+function output = LFOSelect(amplitude, frequency, phase, fs, duration, input,number)
+%UNTITLED Summary of this function goes here
+%   Detailed explanation goes here
+    if(number == "Option 1")
+        output = lfo_sawtooth(amplitude, frequency, phase, fs, duration, input);
+    elseif(number == "Option 2")
+        output = lfo_sine(amplitude, frequency, phase, fs, duration, input);
+    else
+        output = input;
+    end
+end
+

src/Select/OffsetSelect.m

@@ -0,0 +1,19 @@
+%Written by Darell 
+
+% CONTRIBUTORS:
+% Person1: Darell
+
+% DOCUMENTATION:
+%Pass-through function used by app
+
+function output = OffsetSelect(input,value,number)
+    if(number == "Option 1")
+        output =  Meghaj_Echo(input, value);
+    elseif(number == "Option 2")
+        output = Petha_Hsu_PitchOffset(input, value);
+    else
+        output = input;
+    end
+end 
+
+

src/Select/PitchEnvelopeSelect.m

@@ -1,6 +1,16 @@
+%Written by Darell 
+
+% CONTRIBUTORS:
+% Person1: Darell
+
+% DOCUMENTATION:
+%Pass-through function used by app
+
 function output = PitchEnvelopeSelect(input, Fs, attack,decay,sustain,release,number)
     if(number == "Option 1")
         output = DarellAnnePitchEnvelope(input, Fs, attack,decay,sustain,release);
+    elseif(number == "Option 2")
+        output = DarellAnneLinearPitchEnvelope(input, Fs, attack,decay,sustain,release);
     else
         output = input;
     end

src/Select/SoundGeneratorSelect.m

@@ -1,3 +1,11 @@
+%Written by Darell 
+
+% CONTRIBUTORS:
+% Person1: Darell
+
+% DOCUMENTATION:
+%Pass-through function used by app
+
 function output = SoundGeneratorSelect(amplitude, frequency, phase, fs, duration, duty,number)
     if(number == "Option 1")
         output = generate_sine(amplitude, frequency, phase, fs, duration, duty);
@@ -8,7 +16,9 @@ function output = SoundGeneratorSelect(amplitude, frequency, phase, fs, duration
     elseif(number == "Option 4")
         output = generate_sawtooth(amplitude, frequency, phase, fs, duration, duty);
     elseif(number == "Option 5")
-        output = generate_white(amplitude, frequency, phase, fs, duration, duty);
+        output = generate_white(amplitude, fs, duration);
+    elseif(number == "Option 6")
+        output = generate_halfCircles(amplitude, frequency, phase, fs, duration, duty);
     else
         output = 0;
     end

src/generate_heartbeat.m

@@ -0,0 +1,46 @@
+function x = generate_heartbeat(amplitude, frequency, phase, fs, duration, duty)
+% GENERATE_SINE: returns a matrix of sampled heart monitor wave
+
+% CONTRIBUTORS:
+% Alex Nguyen: Original Author
+% Conner Hsu: Reviewed Code and Assisted in polishing
+
+% DOCUMENTATION:
+% phase shift is in number of periods
+% fs is the sampling frequency: how many sample points per second
+% duration is time in seconds
+% duty cycle should be a number between 0 and 0.5.
+    % duty of 0 or less would return 0 for all sample points
+    % duty of 0.5 or less would return a heartbeat signal since there would be
+        % equal amount of space within 1 period to have the right and left sides be equal
+    % duty of greater than 0.5 but less than 1 would return a slope starting at that duty i.e.
+        % the left side but leaving little room to the right side
+    % duty of between 1 and 2 would give a sawtooth wave in the +amplitude.
+    % duty greater than 2 would return 0 for all sample points
+   
+
+    % initialize local variables from input arguments
+    n = fs * duration; % number of samples (length of matrix)
+    dt = 1 / fs; % sampling period: time between two sample points
+    
+    
+    % initialize a one dimensional zero matrix to be populated
+    x = zeros(1, n);
+    
+    % populate the matrix
+    for i = 1:n
+        t = i * dt; % time at the i'th sample
+        st = mod(frequency * t - phase, 1);
+
+        if (duty-(duty / 2) < st && st < duty)
+            slope = amplitude / duty;
+            intercept = -0.5 * amplitude;
+            x(i) = slope * st + intercept;
+        elseif (duty < st && st < duty+(duty / 2)) 
+            slope = amplitude / duty;
+            intercept = -amplitude;
+            x(i) = slope * st + (1.5 * intercept);
+        else
+            x(i) = 0;
+    end
+end