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40 Cards in this Set
- Front
- Back
If you hear two sounds with frequencies 50 Hz and 3000 Hz, at the same intensity level 70 dB, which will sound loudest? |
3000 Hz |
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The part of the ear, which helps in funneling short-wave sound in toward the eardrum is called |
pinna |
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The ossicles are part of |
middle ear |
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What three intervals are contained in a chord C(4)/E(4)/G(4) |
major third, minor third, perfect fifth |
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In equal-tempered tuning the interval C(4)-F(4) has the ratio of frequencies |
1.33 |
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In equal-tempered tuning the frequency (in Hz) of the note one tone above 220 Hz is |
220x1.059x1.059 |
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The frequencies of the first 3 natural modes of a vibrating system are f(1), 2.04 f(1), which deviate only slightly from the harmonic series. These are typical values for |
one of the uppermost strings of a piano. |
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If sine waves of frequency 120, 300, 600, 900 and 60 Hz are added together, what is the frequency of the resulting complex wave? |
60 Hz |
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The complex waveform repeats every 4 ms. What are the frequencies of its first three Fourier harmonics? |
250, 500, 750 Hz |
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Wave A is a 10 Hz sawtooth and wave B is 25000 Hz triangular wave |
A is audible but B is not |
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In equal-tempered tuning the interval perfect 4th has the ratio of frequencies |
1.33 |
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The amplitude of the fundamental harmonic in a square wave is 20. The amplitude of second harmonic in this wave is |
20 |
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The amplitude of the fundamental harmonic in a square wave in 20. The amplitude of fifth harmonic in this wave is |
4 |
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The amplitude of the fundamental mode in a simple sawtooth wave is 60. The amplitude of fourth harmonic in this wave is |
15 |
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Sounds of frequencies 100 Hz, 200 Hz, and 153.3333 Hz and of waveforms of sine waves being combined produce |
aperiodic waves |
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The using of a vibrato results in |
a broadening of existing lines |
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The audible range of sine waves is roughly 20 to 20,000 Hz. Wave A is 5 Hz square wave and B is 25,000 Hz square wave. |
Neither A nor B are audible. |
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Square wave |
odd harmonics An= A1/n; In= I1/n2 |
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Triangular wave |
odd harmonics An= A1/n2; In=I1/n4 |
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Sawtooth wave |
odd and even harmonics An= A1/n; In= I1/n2 |
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Modulated tones |
vibrato and tremolo |
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Vibrato |
Frequency modulated |
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Tremolo |
Amplitude modulated |
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Percussion Instruments |
bars and stripes frequency is indirectly proportional to the length of a bar squared |
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Membrane |
Circular modes (antinode in the center), radical modes (node in the center). |
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Effective frequency of a membrane |
2/T |
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Natural modes of a thin string |
fn = nv/2L; ln = l1/n; l1=2L. |
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Outer ear |
pinna, outer canal, eardrum |
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middle ear |
ossicles, eustachian tube |
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inner ear |
auditory nerve, cochlea |
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Phons |
Loudness level is the same number as the sound intensity level for 1000 Hz in dB. |
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Sone |
the unit of loudness which is defined as the loudness of a 1000 Hz tone at a sound level of 40 dB |
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Equal temperament |
a musical temperament, or a system of tuning, in which every pair of adjacent pitches is separated by the same interval. In other words, the pitches of an equal temperament can be produced by repeating a generating interval. |
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Intervals |
can be vertical or harmonic if the two notes sound simultaneously, or horizontal, linear, or melodic if they sound successively. Three or more notes sounding together form a chord containing the combination of several intervals. |
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Musical Intervals |
(third, fifth, octave) white keys (minor, major, augmented, diminished) black keys |
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Harmonic Series |
a set of frequencies consisting of a fundamental and the harmonics related to it by an exact fraction, a series of values in harmonic progression |
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Periodic wave |
a continually oscillating motion. |
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The striking of a circular membrane exactly at the center will excite |
all circular modes |
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The frequency of the first natural mode of some string is 200 Hz. What is the frequency of the fifth mode? |
1000 Hz |
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For a piano the longest decay time demonstrate |
bass |