ACARA Digital Technologies Years 7–8 Crossword: Representing Text, Images and Sound (Modules 153–172)
Name:
Date:
Class:
✎
Crossword
Read each clue and write the matching term in the grid. Numbers in brackets show the letters in each word.
1
2
3
4
5
6
7
8
9
10
Across
- 5. Word 2 of the term in 4 Down: ______ _____ (5)
- 8. A graph of a sound. Time runs left to right and volume goes up and down. Louder sounds make taller waves and silence is a flat line. (8)
- 9. A tool that picks one pixel in an image and shows the red, green and blue numbers (0 to 255) stored for it, such as rgb(255, 0, 0) for pure red. (10)
- 10. One measurement of a sound wave's volume at a single moment in time, stored as one whole number. Many samples taken at equal time steps are dots on the waveform. (6)
Down
- 1. Each pixel uses 8 bits for red, 8 for green and 8 for blue. That is 3 bytes (24 bits) per pixel, giving 256 x 256 x 256 = about 16.7 million possible colours. Word 3 of: 24-___ ______ (6)
- 2. Word 2 of the term in 1 Down: 24-___ ______ (3)
- 3. ______ images store a colour number for every pixel and blur when enlarged; vector images store shape instructions and stay sharp at any size. Word 1 of: ______ vs ______ (6)
- 4. An ______ stored as shapes and paths (lines, curves) described by numbers and drawn when shown, not as a grid of pixels. It can scale up without pixelation. SVG is a common format. Word 1 of: ______ _____ (6)
- 6. The number of bits used to store each second of sound: sample ______ x sample resolution. A higher ______ means better accuracy but more storage per second. Word 2 of: ___ ____ (4)
- 7. A sample resolution of n bits gives 2^n volume ______, so each extra bit doubles the ______. 8 bits give 256 ______ and 16 bits give 65,536. Fewer ______ means more rounding. Word 1 of: ______ = 2^n (6)
Answer Key
ACARA Digital Technologies Years 7–8 · Modules 153–172
1C
2B
3R
4V
O
5I
M
A
G
E
6R
7L
L
T
S
C
8W
A
V
E
F
O
R
M
T
T
T
V
U
E
O
9E
Y
E
D
R
O
P
P
E
R
R
L
10S
A
M
P
L
E
Across
5IMAGE — Word 2 of the term in 4 Down: ______ _____
8WAVEFORM — A graph of a sound. Time runs left to right and volume goes up and down. Louder sounds make taller waves and silence is a flat line.
9EYEDROPPER — A tool that picks one pixel in an image and shows the red, green and blue numbers (0 to 255) stored for it, such as rgb(255, 0, 0) for pure red.
10SAMPLE — One measurement of a sound wave's volume at a single moment in time, stored as one whole number. Many samples taken at equal time steps are dots on the waveform.
Down
1COLOUR — Each pixel uses 8 bits for red, 8 for green and 8 for blue. That is 3 bytes (24 bits) per pixel, giving 256 x 256 x 256 = about 16.7 million possible colours. Word 3 of: 24-___ ______
2BIT — Word 2 of the term in 1 Down: 24-___ ______
3RASTER — ______ images store a colour number for every pixel and blur when enlarged; vector images store shape instructions and stay sharp at any size. Word 1 of: ______ vs ______
4VECTOR — An ______ stored as shapes and paths (lines, curves) described by numbers and drawn when shown, not as a grid of pixels. It can scale up without pixelation. SVG is a common format. Word 1 of: ______ _____
6RATE — The number of bits used to store each second of sound: sample ______ x sample resolution. A higher ______ means better accuracy but more storage per second. Word 2 of: ___ ____
7LEVELS — A sample resolution of n bits gives 2^n volume ______, so each extra bit doubles the ______. 8 bits give 256 ______ and 16 bits give 65,536. Fewer ______ means more rounding. Word 1 of: ______ = 2^n