Bithoven Gdel Encoding of Chamber Music and Functional 8-Bit Audio - PowerPoint PPT Presentation

Bithoven Gödel Encoding of Chamber Music and Functional 8-Bit Audio Synthesis Jay McCarthy UMass Lowell & PLT �

Outline � Waves �

Outline � Waves � Notes �

Outline � Waves � Notes � Scales and Chords �

Outline � Waves � Notes � Scales and Chords � Music �

Synthesis ��

�� Pulse 1 �� Pulse 2 �� Triangle �� Noise ��

(define DUTY (vector 0.125 0.25 0.5 0.75)) (define (pulse-wave n period volume %) (define freq (pulse-period->freq period)) (define duty-cycle (vector-ref DUTY n)) (define next-% (cycle%-step % freq)) (define out (if (< next-% duty-cycle) volume 0)) (values out next-%)) ��

(define CPU-FREQ-MHz 1.789773) (define CPU-FREQ-Hz (* CPU-FREQ-MHz 1000.0 1000.0)) (define (pulse-period->freq period) (/ CPU-FREQ-Hz (* 16.0 (+ 1.0 period)))) (define (cycle%-step % freq) (define %step (/ freq 44100.0)) (define next% (+ % %step)) (- next% (floor next%))) ��

(struct wave:pulse (duty period volume)) (struct wave:triangle (on? period)) (struct wave:noise (short? period volume)) (struct wave:dmc (bs offset)) (struct synth-frame (p1 p2 t n d)) ��

(struct synth-frame (p1)) (define (synth sf) (match-define (synth-frame p1) sf) (match-define (wave:pulse d p v) p1) (define sample-count 735) (define samples (make-bytes sample-count)) (for/fold ([p1-% 0.0]) ([i (in-range sample-count)]) (define-values (p1 new-p1-%) (pulse-wave d p v p1-%)) (bytes-set! samples i p1-d) new-p1-%) samples) ��

��

Instruments ��

(define (pulse-freq->period freq) (define pre (/ CPU-FREQ-Hz (* 16.0 freq))) (round (- pre 1.0))) (define pulse-tone->period (compose1 pulse-freq->period tone->freq)) ��

(define (i:pulse #:duty ds #:period ps #:volume vs) ( λ (frames tone) (define d* (stage-spec ds frames)) (define p* (stage-spec ps frames)) (define v* (stage-spec vs frames)) (define base-per (pulse-tone->period tone)) (for/list ([f (in-range frames)]) (define duty (eval-spec d* f)) (define per (fx+ base-per (eval-spec p* f))) (define volume (eval-spec v* f)) (wave:pulse duty per volume)))) ��

(define (i:pulse:basic duty) (i:pulse #:duty (spec:constant duty) #:period (spec:constant 0) #:volume (spec:constant 7))) ��

(define (i:pulse:tremolo freq duty) (i:pulse/spec #:duty (spec:constant duty) #:period (spec:constant 0) #:volume (spec:% (spec:modulate freq 7 4)))) ��

(define (i:pulse:linear duty) (i:pulse/spec #:duty (spec:constant duty) #:period (spec:constant 0) #:volume (spec:% (spec:linear 7 0)))) ��

(define (i:pulse:plucky duty) (i:pulse/spec #:duty (spec:constant duty) #:period (spec:constant 0) #:volume (spec:adsr 'release 4 (spec:constant 14) 4 (spec:linear 14 7) 4 (spec:constant 7) 4 (spec:linear 7 0)))) ��

(define (i:pulse:natural duty) (i:pulse/spec #:duty (spec:constant duty) #:period (spec:constant 0) #:volume (spec:adsr 'sustain 4 (spec:constant 14) 4 (spec:linear 14 7) 4 (spec:constant 7) 4 (spec:linear 7 0)))) ��

Bithoven Gdel Encoding of Chamber Music and Functional 8-Bit Audio - PowerPoint PPT Presentation

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Bithoven Gdel Encoding of Chamber Music and Functional 8-Bit Audio - PowerPoint PPT Presentation

Bithoven Gdel Encoding of Chamber Music and Functional 8-Bit Audio Synthesis Jay McCarthy UMass Lowell & PLT Outline Waves Outline Waves Notes Outline Waves Notes

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Module 4: Powerful Interviewing Techniques Lesson 4: Advanced Communication Tips In this training

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3-5 July 2019 Round Table: Homage Ricardo Galler HISTORY OF YELLOW FEVER 334 Years Yellow

targets for actinide transmutation Philippe MARTIN CEA Marcoule / N uclear E nergy D ivision,

Timed and Hybrid Systems 2009-2014 Oded Maler CNRS - VERIMAG Grenoble, France November 2014

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DRUM TRANSCRIPTION VIA JOINT BEAT AND DRUM MODELING USING CONVOLUTIONAL RNNs Richard Vogl 1,2

Topics in Combinatorial Optimization Orlando Lee Unicamp 4 de junho de 2014 Orlando Lee

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