Music Signal Processing Quiz

Music Signal Processing Quiz

1st - 5th Grade

13 Qs

quiz-placeholder

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Music Signal Processing Quiz

Music Signal Processing Quiz

Assessment

Quiz

Performing Arts

1st - 5th Grade

Hard

Created by

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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