Data Representation

Question 1

how do u calculate file size?
what is sampling (rate) frequency?
what is sample resolution?

Answer 1

SAMPLE RATE(Hz) X SAMPLE RESOLUTION(bits) X LENGTH(seconds)
how many times a sample is taken per second, measured in Hz
How many bits are available to store the samples. Also known as bit depth

Question 2

what is a bit?
what is a nibble?
what is a byte?
what is a kilobyte?
what is a megabyte?
what is a gigabyte?
what is a terabyte?
what is a petabyte?

Answer 2

A bit is a single unit of binary data

½ a byte/4 bits = nibble

8 bits = 1 byte

1 kilobyte = 1000 bytes

1 megabyte = 1,000,000 bytes

1 gigabyte = 1,000,000,000 bytes

1 terabyte = 1,000,000,000,000 bytes

1 petabyte = 1,000,000,000,000,000 bytes.

Question 3

what does the binary table look like?

Answer 3

128 64 32 16 8 4 2 1

Question 4

what is binary?
what is decimal?
what is Hexadecimal?

Answer 4

A base 2 numerical system, containing only 1 and 0, that corresponds with the number above it from the list 128 – 1.
A base 10 numerical system which is what humans use to read numbers.
A 16 base numerical system which also uses letters to generalise larger numbers.

Question 5

what is a bitmap?
what is a pixel?
what is resolution?
what is colour (bit) depth?
what is metadata?
what is lossy compression?
what is lossless compression?

Answer 5

An image made up of pixels.
Smallest unit of a digital image which can be displayed.
The number of pixels displayed on the monitor in the bitmap/ image.
The number of bits used to define the colour channels.
Extra information in a file.
File is made smaller but data is lost.
File is made smaller but no data lost.

Question 6

how do you convert a BIT PATTERN to HEXIDECIMAL?

Answer 6

1. split it into 2 nibbles
2. work out the decimal for the left side
3. work out the decimal for the right side
4. convert any numbers 10 and over into the correct letters

Question 7

how do you convert HEXIDECIMAL to BINARY?

Answer 7

1. split the hex into 2 digits
2. find the decimal values of each digit
3. convert first digit into nibble
4. convert second digit into nibble

Question 8

how do you work out the HEXIDECIMAL REPRESENTATION of a DECIMAL NUMBER?

Answer 8

1. write the hex units
2. find out how many 16s go into the number.
3. find out how may are left over
4. add to your hex units table
5. convert any digits into hex

Question 9

how do you work out the DECIMAL REPRESENTATION of a HEX NUMBER?

Answer 9

1. write the hex units
2. add your hex digits
3. convert hex digits to decimal
4. multiply the units with the digit below
5. add the results together

Question 10

what are the hexidecimal digits?

Answer 10

1
2
3
4
5
6
7
8
9
10=A
11=B
12=C
13=D
14=E
15=F

Question 11

do compression

Answer 11

im from bredford men