Kategorier: Alle - auditory - compression - neurons - frequency

av Alexander Refsum Jensenius 7 dager siden

165

Psychoacoustics

Understanding how humans perceive sound involves examining various components, including the anatomy of the ear and the brain's processing mechanisms. The ear is divided into the outer, middle, and inner sections, each playing a distinct role in sound transmission.

Psychoacoustics

Psychoacoustics

Digitization

Visualizations
Spectrogram
Waveform
Digital audio
Compression

MP4

MP3

Container
Bit depth
Bit rate

32 bit (float)

32 bit (int)

24 bit

16 bit = 0-65 534 (CD standard)

8 bit = 0-255

Sampling rate

96 / 192 kHz

48 kHz (standard)

44.1kHz = 44 100 Hz (CD format)

Nyquist frequency = Double of the audible range

I/O
DAC
ADC

Cognition

Auditory cortex
Neurons
14-16 billion neurons in the cortex
Cerebral cortex
The brain

Perception

Space
Time
Masking

Temporal masking

Just noticeble differences
Critical bands

Auditory filters

Loudness
Threshold of pain

>120dB

Hysteresis
Threshold of hearing
Equal-loudness contours (Fletcher-Munson)
Frequency
Just noticeable differences (JND)
Instruments

Saxophone

Sony Rollins tone

Piano

32-4186 Hz

Ranges

Ultrasound

>20,000 Hz

Audible sound

20-20,000 Hz

Infrasound

<20 Hz

Sensation

The ear
Inner ear
Middle ear
Outer ear
Auditory system