Psychoacoustics
Sensation
Auditory system
The ear
Perception
Frequency
Ranges
Infrasound
<20 Hz
Audible sound
20-20,000 Hz
Ultrasound
>20,000 Hz
Instruments
Piano
32-4186 Hz
Saxophone
Just noticeable differences (JND)
Loudness
Equal-loudness contours (Fletcher-Munson)
Threshold of hearing
Hysteresis
Threshold of pain
>120dB
Time
Critical bands
Auditory filters
Just noticeble differences
Masking
Temporal masking
Space
Cognition
Digitization
I/O
ADC
DAC
Digital audio
Sampling rate
44.1kHz = 44 100 Hz (CD format)
Nyquist frequency = Double of the audible range
48 kHz (standard)
96 / 192 kHz
Bit rate
8 bit = 0-255
16 bit = 0-65 534 (CD standard)
24 bit
32 bit (int)
32 bit (float)
Bit depth
Container
Compression
MP3
MP4
Visualizations