Lecture 11 - Sound

Question 1

Volume

Answer 1

The higher the wave the louder the sound

Question 2

Pitch or Frequency

Answer 2

The closer together the waves the higher the pitch

Question 3

What four things is the quality of sound dependent on?

Answer 3

1. Sample Rate
2. Sample Size
3. Channels
4. Codecs

Question 4

Sample Rate

Answer 4

Number of samples taken in a second

1000 sample per second = 1KHz (1000Hz)

Question 5

What is the Nyquist Limit?

Answer 5

Taking two or more samples per wave

Question 6

What type of compression do Codecs use?

Answer 6

Lossy

Question 7

What file formats are uncompressed?

Answer 7

.wav

.aiff

Question 8

What is MIDI music?

Answer 8

Musical Instrument Digital Interface, classified as synthesized sound

Question 9

Downloadable Audio

Answer 9

Once downloaded, can be edited etc and does not need a special streaming web server to post the file

Takes a long time to download (especially for big files) and takes up disk space on the computer to store it

Question 10

Streamed Audio

Answer 10

Plays immediately and only consumes RAM when being played

Can’t rewind or pause and needs a special server to post it

Question 11

Sample Rates for:

Voice Only

AM Quality

FM Quality

CD

Answer 11

Voice Only = 8KHz

AM Quality = 11.025 KHz

FM Quality = 22 KHz

CD = 44.2 KHz