Categorii: Tot - auditory - compression - neurons - frequency

realizată de Alexander Refsum Jensenius 2 luni în urmă

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Psychoacoustics

The field of psychoacoustics delves into how humans perceive sound, involving the intricate processes of the ear, auditory system, and brain. The auditory pathway includes the outer, middle, and inner ear, which work together to transmit sound waves to the auditory cortex where neurons process these signals.

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