Physics 问题

reverberation time isa. directly proportional to the volume of the roomb. inversely proportional to the area of the opening c. a and bd. is not affected by the volume of the room

identify the wrong statementa. 3 harmonic equals 2nd overtoneb. the frequency of free vibration is also called resonant or natural frequencyc. the doppler effect (or the doppler shift) is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave sourced. the precise relationship between pitch, the perceptual and physical quantity is very straightforward (proportional) For example the tripling of a pitch from 1000mels to 3000 mels corresponds to the frequency of 3000 Hz.

for a complex periodic signal, the pitch often corresponds to the blank frequency in the waveform which by definition in the fundamental frequencya. lowestb. highestc. meand. median

studies of a listeners ability to detect small differences in pitch measure a. frequency discriminationb. loudness discriminationc. critical band maskingd. cone of confusion

t or f longer rise and fall time results in less transient distortion

the unit of pitch isa. melsb. phonsc. sonesd. decibels

when you have a frequency selective system blank occurs from the input to the outputa. filteringb. transientc. instantlyd. b and c

peak clipping is an example ofa. amplitude distortionb. frequency distortion c. transient distortiond. duration distortion

as a sound source (such as an ambulance) moves away from you, the pitch of the sounda. increaseb. decreasec. remain samed. b and c

In blank system, the output amplitude is not proportional to the input amplitude a. amplitudeb. longer, narrowerc. non-lineard. linear

t or fif a signals rise or fall time is very short, an audible transient is heard

To correct farsightedness use _______ lens.

in nearsightedness, does the image hit behind or in front of the retina

To correct nearsightedness use ______ lens.

the lens _____ to see something getting closer

in farsightedness, does the image hit behind or in front of the retina?

Transforms to vibrating sounds into ___________impulses

for sign conventions, up and to the right are ____________

for sign conventions, down and to the left are ____________

if not stated, initial time is likely _______