Term
| In modern cinema, digital sound is reproduced in the theater from _____ |
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Definition
| a compact disk synchronized to the film. |
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Term
| A certain sound card digitizes the sound at a sampling rate of 22.2 kHz. According to the Nyquist Criterion, what is the maximum frequency that can be faithfully recorded by this sound card? |
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Definition
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Term
| In a vinyl LP record, the acoustic information is stored as ___________________ |
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Definition
| Analog variations in the depth and width of the groove. |
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Term
| In a tape cassette recorder, the sound information is recorded as ____________ |
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Definition
| fluctuations in the direction and magnitude of small magnetic fields. |
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Term
| A dynamic microphone uses ___________ |
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Definition
| a small coil attached to a diaphragm that moves in a magnetic field. |
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Term
| A condenser mic _____________ |
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Definition
| uses the variation in the distance between two conducting diaphragms to produce an electrical signal that is the analog of the sound pressure fluctuation. |
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Term
| The number 9 ("nine") is correctly represented by which of the following binary numerals? |
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Definition
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Term
| A cardioid microphone ________ |
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Definition
| is much more responsive to sounds coming from one direction because of interference effects. |
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Term
| The secret of digital electronics is ________ |
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Definition
| simple two-state (on or off) switches arranged in complicated circuits. |
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Term
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Definition
| energy propagating by means of longitudinal waves produced by a vibrating object. |
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Term
| What is the speed of a 1kHz sound wave in air at 37 C? |
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Definition
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Term
| An automobile is running over the rumble strips at the side of a highway. If the tire runs over a bump once every 33.3 milliseconds, what is the frequency of the sound wave that the tire will emit? |
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Definition
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Term
| What is the wavelength of a sound wave in air (assume 20C) from a tuning fork labeled "A4 440 Hz"? |
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Definition
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Term
| A supersonic plane travels at Mach 2.0 (twice the speed of sound). How fast is this? (Hint: 1 m/s = 2.24 mph). |
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Definition
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Term
| What is the frequency of a sound wave that has a wavelength at 53C (v = 363 m/s) of 1 meter? |
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Definition
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Term
| Wavelength is ______________ |
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Definition
| the distance from one point on a wave to the corresponding point on the next cycle. |
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Term
| What is the fundamental of a harmonic series that contains the following frequencies: 440, 880, 1320? |
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Definition
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Term
| If one doubles the spring constant k in a simple harmonic oscillator, what happens? |
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Definition
| The frequency increases by a factor of about 1.414. |
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Term
| When the Comet Shoemaker-Levy 9 crashed into Jupiter in 1994, creating a hole the size of the earth, why did we not hear it in Denton? |
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Definition
| Sound waves cannot travel through a vacuum because there is no matter to oscillate. |
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Term
| What is Ohm's Law for acoustics? |
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Definition
| The human ear is insensitive to the phase of sound waves. |
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Term
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Definition
| a unit of perceived loudness level. |
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Term
| The human ear senses the frequencies in a sound by ______________ |
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Definition
| the resonances of the basilar membrane in the cochlea. |
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Term
| The Fletcher-Munson diagram plots _________ |
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Definition
| the sound intensity level corresponding to various perceived loudness levels as a function of frequency. |
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Term
| What is the threshold for hearing in dB? |
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Definition
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Term
| What happens to the perceived pitch if a sustained low note is played loudly? |
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Definition
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Term
| In recording and electronic amplification equipment there is a "VU" meter that measures the intensity of the sound in "volume units" or decibel. How much more intensity is a VU reading of 20 dB than one of 10 dB? |
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Definition
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Term
In the plot of the SIL versus time below for a room, what is the approximate reverberation time?
[GRAPH] |
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Definition
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Term
| If a room has an effective absorption area of Se = 800 Sabine when it is empty, and the reverberation time is 2 sec, what will happen when an audience of 1000 people is added? (Assume the effective area of a person is .8 Sabine) |
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Definition
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Term
| Before a rock concert begins, a sound engineer measures the SIL of a speaker to be 110 dB (.1W/m2) at a distance of 10 m from a loud speaker. What will be the approximate SIL due to this speaker alone at 100 m, where you stand, if everything else is the same? |
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Definition
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Term
| The effect of the mouthpiece and the bell is to alter the harmonic sequence of a trumpet, such that _________________ |
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Definition
| the lowest freq. is often not harmonic w/ the overtones. |
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Term
| Just temperament is based on ____________ |
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Definition
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Term
| What is the approx. fundamental freq. of a guitar string .62 m long stretched w/ a tension of 100 N and for which 1 m of the string has a mass of .006 kg? |
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Definition
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Term
| In the equal tempered scale, the ratio of notes that are a semitone apart. |
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Definition
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Term
| What is the approx. fundamental freq. of C5 if A4 is tuned to 440 Hz on the equal tempered scale. |
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Definition
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Term
| A cent is what part part of a semitone interval? |
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Definition
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Term
| According to Fourier, into a series of what wave type can all periodic waveforms be decomposed? |
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Definition
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Term
| When you add water to a bottle and blow across it's mouth, ________________ |
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Definition
| the freq. gets higher b/c the "air spring" is stiffer |
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Term
| What is the approx. freq. of a SIL w/ m=.5 kg and K=1.6 x 10^6 N/m? |
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Definition
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Term
| A radio produces sound b/c |
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Definition
| the audio signal is encoded in the radio wave amplitude or freq. |
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Term
| Standing wave formation inside a tube of uniform cross section is mostly attributable to |
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Definition
| Longitudinal sound wave reflection at the boundaries. |
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Term
| Near the open end of an air column in vibration, there would be both |
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Definition
| a pressure node and a displacement anti-node |
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Term
| In an open cylindrical organ flute pipe played at 20 C, what is the approx. freq of the first overtone if the pipe is 1.5 m long? |
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Definition
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Term
| What is the approx. fundamental freq. of a pan pipe played at 20 C and that is 19.5 cm long? |
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Definition
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Term
| In an ideal open tube of cylindrical cross section |
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Definition
| only odd members of a harmonic series can exist |
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Term
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Definition
| The reed end is treated as a closed end, but instrument with a conical bore like the sax, allows the instruments to play all harmonics |
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Term
| Valve sounds from the human voice can be characterized by their formants. |
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Definition
| Formants are broad resonance bands of the vocal tract. |
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Term
| The pitch of the human voice is caused by: |
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Definition
| The vibration modes of the vocal folds |
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Term
| Vibration modes on a drum membrane |
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Definition
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Term
| The cheif difference between a xlyophone and a marimba |
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Definition
| the marimba has a deeper and wider undercut |
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Term
| A natural horn such as a bugle |
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Definition
| Changes pitch by the lips at different frequencies. Ally hany if you miss this one you are an idiot. Sincerely, Addison |
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