3&4 Images And Sound

Question 1

What is Nyquists theorem?

Answer 1

Nyquist states that for lossless digitalisation you must sample at least 2 per wave cycle

Question 2

What is STEREO sound

Answer 2

Sound where two different mics record for 2 speakers so the file size is twice as big

Question 3

How is sound sampled?

Answer 3

1. Samples are taken at regular and fixed interval (according to the sound frequency) of the waves amplitude
2. These samples are quantised
3. These quantities are then converted to their closest available binary equivalent

Question 4

What is a vector image?

Answer 4

Stored as objects formed by a description of their properties using graphical functions

Question 5

What properties can vector images have?

Answer 5

Radius
Colour fill
Colour outline
Coordinate of centre

Question 6

Name 3 advantages of vector images

Answer 6

Usually take up less space
Can be enlarged without loss in quality
Easier to edit objects

Question 7

What is MIDI?

Answer 7

Musical Information Digital Interface is a method of storing sounds as instructions to reproduce the sound rather than the recorded sound itself

Question 8

Name 4 properties stores in MIDI

Answer 8

Length of note
Pitch
Instrument
Volume