Waveform Characteristics
Wave cycles per second (CPC), Hz
How do you measure Frequency?
20 Hz to 20 kHz
What is the range of human hearing?
Late reflections, or "wetness" of a room.
What is Reverb?
130 dB SPL (as loud as a jet engine)
What is the Threshold of Pain?
1125 ft/sec (λ=v/f)
What is the speed of sound?
ADSR (Attack, Decay, Sustain, Release). A change in amplitude over time.
What is Envelope?
The ability of a human to focus on a sound source and, essentially, eliminate other sound sources.
What is Selective/Focused listening?
A burst of loud sound above 140 dB
What can lead to Acoustic Trauma?
Peak to peak, trough to trough
What is a period?
When sounds become quieter or nullify entirely due to interaction with the inverse of itself.
What is destructive interference?
A very short delay applied to to one channel- generally no longer than 35ms, resulting in a wider sounding stereo field.
What is the Haas Effect?
The muscles lose their ability to relax, permanently lowering the perceived volume of sounds.
What is a Permanent Threshold Shift?
The 7 waveform characteristics
Wavelength
Frequency
Amplitude
Phase
Velocity
Timbre - Spectrum
Envelope
Noticed by quick attack and high amplitude, the initial point of a waveform starting just after excitation.
What is a Transient?
The sound source and the first bounces off walls helps to perceive direction and distance of a sound.
What is Direct Sound/Early Reflections.