Quizz 1

Question 1

Definition of Frequency:

Answer 1

The number of pressure cycles (high-low pressure) that occur per second. Measured in Hertz (Hz).

Question 2

Frequency and Pitch Relationship:

Answer 2

Higher frequency corresponds to higher pitch.

Question 3

Average Threshold of Human Hearing

Answer 3

Around 1-1.5 kHz.

Question 4

Just Perceptible Change in Level:

Answer 4

The smallest change in sound level detectable by humans is around 1 dB.

Question 5

Sound Pressure Measurement:

Answer 5

Measured in Pascals for pressure, but commonly expressed in decibels (dB) as a ratio relative to the threshold of hearing.

Question 6

Threshold of Pain in db

Answer 6

Around 120-130 dB.

Question 7

Human Hearing Range:

Answer 7

Audible sound for humans consists of pressure variations between 20 Hz and 20 kHz.

Question 8

Directional Hearing:

Answer 8

The brain processes slight differences in time and amplitude between the two ears to perceive sound direction (using Pinna and Cochlea).

Question 9

Pinna Function

Answer 9

Directs sound into the ear canal and toward the eardrum

Question 10

Tympanic Membrane (Eardrum)

Answer 10

Vibrates with sound and transmits vibrations through the ossicles in the middle ear.

Question 11

Ossicles

Answer 11

Consist of the Malleus, Incus, and Stapes, transmitting sound from the eardrum to the inner ear.

Question 12

Cochlea

Answer 12

Part of the inner ear where vibrations are turned into nerve signals.

Question 13

Basilar Membrane:

Answer 13

A membrane in the cochlea that vibrates at different places for different frequencies, helping to process sound.

Question 14

Phonogram Invention

Answer 14

By Thomas Edison, saw widespread use from 1877 to 1925.

Question 15

Magnetic Tape Invention

Answer 15

Developed by Fritz Pfleumer, it allowed for increased bandwidth and longer recording times compared to earlier recording methods.

Question 16

Vinyl Records rotate at what rpm

Answer 16

Rotate at 33 or 45 rpm.

Question 17

A 300Hz vertical cut

Answer 17

in vinyl typically results in phase cancellation between the left and right channels.

Question 18

DAC (Digital to Analogue Converter)

Answer 18

Converts digital signals into analogue for playback (e.g., speakers).

Question 18

Sample Rate

Answer 18

The number of digital samples per second, with common rates being 44.1kHz, 48kHz, etc. Higher rates capture higher frequencies.

Question 19

Nyquist Frequency

Answer 19

The highest frequency that can be sampled accurately, typically half the sample rate.

Question 20

Headroom

Answer 20

Refers to the dynamic range available before clipping or distortion occurs.

Question 21

Uncompressed Audio Formats:

Answer 21

WAV, AIFF

Question 22

Lossy Compressed Audio Formats:

Answer 22

MP3, AAC

Question 23

Distortion

Answer 23

Any unwanted addition or subtraction to the signal, such as harmonic distortion or clipping. Digital recordings can clip if pushed beyond 0dB but cannot be fixed easily.

Question 24

Clipping

Answer 24

Digital clipping occurs when the signal exceeds the available dynamic range, often irreversible.

Question 25

Fritz Pfleumer invented

Answer 25

Invented magnetic tape, which enhanced audio recording quality and flexibility.

Question 26

Technological Advancements: in audio the introduction of:

Answer 26

The introduction of CDs and computers played a pivotal role in modern audio recording, providing increased fidelity and storage capacity.

Question 27

what's timbre

Answer 27

In music, the perceived musical sound quality of a note is its timbre. Timbre is the difference between hearing music or just noise.

Question 28

whats Amplitude

Answer 28

The height of a sound wave measured from the rest position to the crest of the wave is called amplitude. The taller a sound wave is, the louder the sound is heard.

Question 29

Wave Speed

Answer 29

How quickly energy is passed from molecule to molecule determines the wave speed of sound. Sound travels at dierent speeds through dierent materials depending on the arrangement of molecules

Question 30

Wavelength

Answer 30

The wavelength of a sound is the measurable distance between two waves.

Question 31

Wave Direction

Answer 31

Sound waves propagate (move) outwards in all directions from the source of the sound. The direction of the wave can be changed through reection, like an echo.