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| − | = Homework #1: Hand-Crafted Digital Audio = | + | = Homework #2: Block-Rockin' Synths = |
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| − | [[File:Hand-craft-weave.jpg|512px|a woman weaves a colorful pattern using a machine]] | + | [[File:SynthMadness.jpg|512px|a hand-drawn sketch of a unsettling scene of music synthesis]] |
| | | | |
| | === Due Date === | | === Due Date === |
| − | * 2021.4.13 11:59:59pm, Tuesday | + | * milestone: 2021.4.21 (in-class) Wednesday |
| | + | * final: 2021.4.26, 11:59pm, Monday |
| | + | * in-class listening: 2021.4.28, Wednesday |
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| | | | |
| | === Instructions === | | === Instructions === |
| − | '''(Part 1)''' Generate several signals in ChucK: impulse, noise, sine, triangle, square waves, modulating pulse widths, with varying envelopes (ADSR etc), with and without low-pass filter (LPF). Bring these into Audacity as WAV files and look at their waveforms (time domain) and spectrograms (time/frequency domain). | + | '''(Part 1)''' |
| − | | + | '''(Part 2)''' |
| − | a. (1a-noise.ck) Write a ChucK program that continuously generates white noise (Noise). Stop the program manually after a finite period of time.
| + | '''(Part 3)''' |
| − | | + | '''(Part 4)''' |
| − | b. (1b-adsr.ck) Same thing, but apply an amplitude envelope (ADSR) with the following parameters: attack=10ms, decay=40ms, sustain=.5, release=100ms. Do the following in an infinite loop { start the envelope with .keyOn(), then 2::seconds later stop it with .keyOff(), wait for another 2::seconds }. Stop the program manually after a finite period of time.
| + | '''(Part 5)''' |
| − | | + | |
| − | c. (1c-noise-filtersweep.ck) Write another ChucK program that is the same as (b), but with a LPF whose cutoff frequency is sweeping up and down between 100 to 800 Hz using a loop that is updating the LPF’s .freq parameter every 10::ms; hints: you could use Math.sin() to compute the time-varying cutoff frequencies, but your program can sweep the cutoff frequency with any shape and timing you desire. To perform a smooth sweep between LPF freq values, you may find it useful to either create a while/for loop OR use the Envelope class. Also, you will need to spork the function that updates the frequency of the LPF.
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| − | | + | |
| − | d. (1d-sine-sweep.ck) Write a ChucK program that generates a sine wave (SinOsc) that sweeps its frequency from 30 to 3000 Hz over 3 seconds smoothly at an time interval of 10::ms
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| − | | + | |
| − | e. (1e-sine-sweep+LPF.ck) Write another ChucK program that is the same as above, but with a LPF whose cutoff frequency is 500 Hz
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| − | | + | |
| − | f. (1f-sqrosc.ck) Next write another ChucK program, same as (e), but with a square wave.
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| − | | + | |
| − | g. (1g-sqrosc-sweep.ck) Next write another ChucK program, like (f), but with the square wave’s frequency constant at 220 Hertz and the LPF frequency sweeping to your taste, along the lines of (c).
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| − | | + | |
| − | h. (1h-q.ck)Same as (g) but increase the LPF’s .Q parameter to at least 3.
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| − | | + | |
| − | i. Using Mini-Audicle’s File->Export feature OR the recording program (rec.ck or rec-auto.ck), record a sound file from each of your eight programs (a) through (h).
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| − | | + | |
| − | j. Open each sound file in Audacity and look at their waveforms (time domain) and spectrograms (time/freq domain).
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| − | | + | |
| − | k. Reflect on what you see: how do these visual representations correspond or not to “what you hear”?
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| − | | + | |
| − | l. Take a screenshot of the one waveform or spectrogram you find most interesting or illuminating. Mention something about it in your written reflection.
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| − | | + | |
| − | m. On your HW1 webpage, include your code from (a)-(h), and your screenshot + reflections from (k) and (l).
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| − | | + | |
| − | '''(Part 2)''' Open a digital audio file that’s meaningful to you (e.g., voice mail from a friend/relative) in Audacity and Paulstretch it however you like. Save the output to a wav file. | + | |
| − | | + | |
| − | '''(Part 3)''' Make a digital sample “by hand”, writing each successive value (a number between -1.0 and +1.0) in an array. You must put between 25 and 250000 numbers into the array (“your sample must contain at least 25 samples”). (Hint: shorter sounds will be less work.) Record your sample to a wav file. (Hint: you might open the wav file in Audacity and prepare it—make sure it isn’t clipping; trimming out extra silence; boost the volume) | + | |
| − | | + | |
| − | '''(Part 4)''' Write a ChucK program to load your generated sample from (3) into a SndBuf and play it at varying amplitudes, rates (=pitch+timbre shift), and timings. | + | |
| − | | + | |
| − | '''(Part 5)''' Craft a short musical statement of 30-90 seconds, combining elements from parts 1, 2, and 3/4. | + | |
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| | === Deliverables === | | === Deliverables === |
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| | Your webpage should include: | | Your webpage should include: |
| − | * 1) your hw1 should live at https://ccrma.stanford.edu/~YOURID/220a/hw1 | + | * 1) your hw2 should live at https://ccrma.stanford.edu/~YOURID/220a/hw2 |
| | * 2) ChucK (.ck) files, as applicable, for Parts 1 through 5 | | * 2) ChucK (.ck) files, as applicable, for Parts 1 through 5 |
| | * 3) sound (.wav) files, as applicable, for Parts 1 through 5 | | * 3) sound (.wav) files, as applicable, for Parts 1 through 5 |
| | * 4) comments and reflections as you work through the homework | | * 4) comments and reflections as you work through the homework |
| − | * 5) notes/title for your short musical statement (Part 5) | + | * 5) notes/title for you mursical statement (Part 5) |
| | * 6) submit ONLY your webpage URL to Canvas | | * 6) submit ONLY your webpage URL to Canvas |
