
Music Signal Processing Quiz
Quiz
•
Performing Arts
•
1st - 5th Grade
•
Hard
LOXE XYZ
FREE Resource
13 questions
Show all answers
1.
OPEN ENDED QUESTION
3 mins • 1 pt
The Problem of Electronic Synthesis • How can we synthesize notes and music ... and have it sound as good as real instruments? • Real instrument tones are complex
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2.
OPEN ENDED QUESTION
3 mins • 1 pt
Oscillators • Pitch = sinusoid? only a single color • Real instruments have more harmonics static spectrum determines instrument sound? • Additive: Combine individual harmonics calculating sinusoids in real time is expensive... • Subtractive: Shape harmonics with filters start with a spectrally rich signal “shape” harmonics efficiently with LTI filters
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3.
OPEN ENDED QUESTION
3 mins • 1 pt
Basic waveforms • Sinusoid • Square wave • Pulse waveform • Sawtooth • Triangle
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4.
OPEN ENDED QUESTION
3 mins • 1 pt
Aside: Bandlimiting • It’s easy to sample “ideal” simple waveforms but the ideal ones are not bandlimited ➝ lots of aliased energy • Solution: Bandlimited waveforms e.g. fill a table with precalculated sum of sinusoids up to a fixed frequency • Variable waveforms can be derived PWM by integrating bandlimited impulses
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5.
OPEN ENDED QUESTION
3 mins • 1 pt
Modulation • Stationary spectra sound unnatural real sources have random “jitter” • Variations in pitch “Low Frequency Oscillator” frequency modulation random noise • Variations in timbre can be imposed by filters... Pulse-width modulation
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6.
OPEN ENDED QUESTION
3 mins • 1 pt
Aside: PWM Spectrum • What are harmonics of Pulse-Width Modulated (PWM) waveforms? consider as impulses convolved with a pulse W ➝ Fourier transforms multiply or integral of sum of two opposite impulse trains with relative delay W (good for bandlimiting)
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7.
OPEN ENDED QUESTION
3 mins • 1 pt
Envelopes • Notes need to be limited in time simple gating not enough amplitude envelope • Different (real) instruments have clear variations in envelope struck/plucked vs. bowed/blown
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