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MUS 447 EXAM QUESTIONS AND ANSWERS LATEST UPDATE (GRADED A+)
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MUS 447 EXAM QUESTIONS AND ANSWERS LATEST UPDATE (GRADED A+) Sound - Answers A vibration through a physical medium as perceived by the ear (Most commonly, the perception of fluctuations of air pressure) How is sound transmitted? - Answers 1. Vibrating sound source 2. Medium of transmission (air,...

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  • November 9, 2024
  • 6
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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MUS 447 EXAM QUESTIONS AND ANSWERS LATEST UPDATE (GRADED A+)

Sound - Answers A vibration through a physical medium as perceived by the ear (Most commonly, the
perception of fluctuations of air pressure)

How is sound transmitted? - Answers 1. Vibrating sound source

2. Medium of transmission (air, water, etc.)

3. Receiver (ears, microphone, etc.)

Frequency - Answers The perceived pitch of a sound is determined by the rate at which these
fluctuations in air pressure occur (Hz)

Audible frequency range of the human ear - Answers 20 Hz to 20,000 Hz

Sub-audio (infrasonic) - Answers Frequencies below range of human ear

Ultrasonic - Answers Frequencies above range of human ear

Amplitude - Answers The perceived loudness of a sound is determined by the height of a sound wave
(decibels)

Amplitude Threshold - Answers greater than 0 dB

Pitch - Answers frequency at which a sound wave vibrates (Hz)

Loudness - Answers relates to the amplitude of the soundwave (dB/SPL)

Timbre - Answers "color" or tonal characteristic of sound

Spatial Location - Answers left/right, up/down, near/far

Duration - Answers long/short/medium

Microphone - Answers A device that converts sound into an electrical signal

Loudspeaker - Answers A device that converts an electrical signal into a corresponding sound

Electro-acoustic transducer - Answers a device that converts acoustic energy into electrical energy or
vice versa

Transducer - Answers a device that convert one type of energy to another

Analog Signal - Answers an electrical signal which represents sound

Composing with representations of sound, a composer can - Answers Create music:

- involving real environment sounds

, -employs non-traditional modes of notation and performance

-using skills learned outside of traditional academic settings

-where sound materials are free from their typical associations — where sound events are no long
evocation symbols, but rather pure "sound objects"

Storing representations of sound - Answers Allows for layering, mixing, and manipulation of sonic
material in an electroacoustic music composition

Analog-to-digital converter - Answers A device which converts an analog signal into a digital
representation of the sound (a series of numbers that represent the fluctuating voltage of the analog
signal)

Digital-to-analog converter - Answers A device which takes the series of stored numbers—the digital
representation of the sound—and converts it back to an analog signal

Waveform - Answers A graphic depiction of sound which shows the fluctuation of air pressure, voltages,
or digital values over time

Cycle - Answers A single, complete occurrence of a waveform

Period - Answers The timespan occupied by one cycle

Wavelength - Answers The distance between the same point in two adjacent cycles. Measured in meters

Frequency (in terms of waveform) - Answers the rate at which one cycle of a waveform is completed
(Hz/cycles per second)

Amplitude (in terms of waveform) - Answers Refers to the strength of the waveform (in terms of air
pressure changes) (-1 to 1)

Periodic - Answers a wave with a continuously repeating cycle (Clear, precise tones, eg., sine, triangle,
saw, and square waves)

Non-periodic - Answers a wave that doesn't have a continuously repeating cycle (speech, cello, birds, car
horns, etc.)

Phase - Answers Used to specify a point on a waveform (0 to 360 degrees-

90, 180, 270 degrees mark the ¼, ½, and ¾ points respectively)

Digital Sampling - Answers The process of converting an analog signal into digital representation of
sound

Sample - Answers One measurements of an instantaneous amplitude of an analog signal by an ADC (in
digital sampling)

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