acoustic articles
What is the minimum time gap required between the original sound and the reflected sound for the human ear to perceive a distinct echo?
Based on the speed of sound in dry air at room temperature (343 m/s), what is the minimum approximate distance required for a reflecting object to produce a distinct echo?
How does the arrival time of reflections primarily distinguish an echo from reverberation?
Which characteristic best describes surfaces that are excellent reflectors of sound energy, leading to strong echoes?
What is the primary function of materials like heavy draperies or acoustic panels in sound environments?
What middle ear component dysfunction can lead to the perception of one's own voice sounding hollow or echoing internally?
Sensory alterations causing internal echoing sensations are sometimes related to which condition involving increased sensitivity to sound volume or frequency?
What electronic phenomenon creates an echo when a microphone picks up sound directly from its own speaker, often in hands-free calls?
What electrical imperfection in a phone system causes signal energy to reflect backward along the line instead of proceeding forward?
Compared to a concert hall targeting an RT60 around 2.0 seconds, what is a typical target for a room designed primarily for speech intelligibility?
What immediate physical setup issue often causes telephone echo in office spaces, overriding overall room size considerations?
If an echo is experienced after speaking in a large open area, what is the underlying mechanism causing the repetition?
What condition must be met for acoustic resonance to cause preferential amplification of sound waves?
What three physical properties entirely determine an object's natural frequency?
In the operation of an empty bottle acting as a Helmholtz resonator, how is acoustic energy exchanged?
What does a high Q-factor signify regarding a resonator's behavior?
Which mechanism describes energy loss quantified by damping?
For a wind instrument tube that is closed at one end, what is a direct consequence on the harmonics produced?
What historical electronic components form the basis of a tuned circuit used for frequency selection?
To achieve a lower fundamental frequency ($f$) in a simple string fixed at both ends, what must be done according to the formula $f = v / (2L)$?
What is the approximate speed of sound ($v$) in dry air at $20^ ext{ extdegree C}$?