Using hex is quicker to write or type, since a hex digit takes up only one character, not four

Hex is used to define colours, in MAC addresses, in ........ languages and machine code

There is more chance of making an error when typing hex characters than a string of 1s and 0s.

Why is the answer to 24 significant?

Hexadecimal uses letters for the values 10 to 15

Which numbering system is known as base 8?

Decimal numbers are easy to understand but they are not easy to use in electronics. Also

Rational numbers (Q) include values that can be expressed as fractions or ratios

Any whole number that can be written as a fraction.

Errors when a datatype used to store data wasn't big enough to hold data.

ASCII stands for:

Is it any good for the variety of symbols in other languages.

Transission errors are when:

Which of the following is not a way of checking for error detection:

With majority voting:

With a checksum:

With a checksum:

With a checksum: I send this coded message to you: We agree on a divisor of 16 (Means that ..... possibilities can be wrong)

In an odd parity scheme, what would be the correct parity bit for the binary string:
1101 0001

Left shifts:

Complete a 2 place right shift on the binary number:

Which statement is true?

Which statement is true?

I need to find -77 in two’s complement. How?

A 16 bit binary allows for 65,536 unique values. If sign is included, then you lose a bit giving 32,768 values. The issue is '0'. If you have a sign bit, then you could have positive and negative 0.

With floating point, he higher the number/range of fractional bits the less accuracy can be gained.

Lower range leads to reduced accuracy.

1 0 0 0 0 + 1 0 1 1 0

1 0 0 1 1 1 - 1 0 0 1

Complete a 1 place right shift on the binary number:

Resolution doesn’t define the actual physical size of an image.

Using one bit per pixel allows only 2 values, 0 and 1

3bits per pixel equates to  1, 4, 8, 16 colours per pixel in an image.3bits per pixel equates to ...... colours per pixel in an image.

In 32-bit colour what are the last 8 bits for? opacity/transparency. 

An image is captured on a 2 megapixel camera

Image captured with a 24 bit colour depth

Which is the correct answer for calculating the file size?

A raster graphic is composed of

Vector files are

Whilst bitmap graphics will often pixelate as you enlarge them, vectors are not mathematically redrawn at whatever size they are set to.

Which image type is best used for simple shapes or unrealistic images?

Which image type keeps the same image quality when expanded in size?

When an analogue signal is measured at regular periods, the amplitude (or voltage of the analogue signal at that point in time) is referred to as the

More bits used per sample enables the height of the wave to be more accurately measured but increases file size.

Resolution is measured in

The frequency or ……. per second affects the level of detail in the digital representation

For calculating a sound file size which of the following is correct?

Nearly all signal that can be sampled are this.  

In Nyquist Theorem, because sound is made up of many components each at different frequencies, samples must be ……… the highest frequency in order to replicate the original sound wave.

What is the sample rate measured in? Hz BPS

What is the standard Sample Rate for recording a song?

Which of these is true?
Increasing the Sample Rate/ Bit Rate increases the ______

What specifically is used to Covert a Binary data to an analogue sound?

Which statement best describes lossy.

Lossless compression tries to reconstruct an image without the missing data

Lossy compression removes data permanently to reduce file size

Lossy compression keeps the sounds in the frequency ranges that we can’t so easily hear or that least affect the perceived playback quality

It’s a bit like having codes like having abbreviations for words.  They can later be expanded into the same thing. Another is like having a paragraph to do with types of fruit and having each fruit represent ted by a thumb nail image. Easy to get it back to the original.  Lossy good for software files, easy to transfer in short space of time. Large reduction in file size is most useful. Something called dictionaries are used here. More in this video on the next slide.

A basic method of compression that summarises consecutive patterns of the same data. What is the correct answer?

Dictionary compression spots regularly occurring data and stores it separately in a dictionary. Which of the following is incorrect.

In a document the word ‘because’ requires 56 bits of data (7 letters x 8 bits). How many occurances of because have we saved?

How many bits was it reduced by?

Vernam cyphers. Choose the incorrect answer.

With fixed point numbers, if we want to hold larger numbers, the point must be set further to ..

With 4.6 the closest you can get in fixed point is:

Whats this number in fixed point? 3.7510

•The number 75,000 can be represented as

0.1011010 0011

What is this number in floating point?

For floating point to binary to decimal:

You need to....

Convert 0.1101100 0100 to decimal, assuming an 8-bit mantissa and 4 bit exponent

Write down the mantissa, 0.1101100

Translate the exponent from binary to decimal; 0100 = 4

The binary point of the mantissa has to be moved 4 places right to multiply it by 24

What is the correct answer?

For negative binary to decimal we need to:

1.0010100 0011

Which is incorrect?

The twos complement of 1.0010100 is

The number 1.0010100 0011 has a negative mantissa and a positive exponent. What is the number in decimal?

Binary to decimal the point always moves to the...

In floating point if the exponent is negative the point must be moved to the .....

To normalise this number 0.0011010  0100

From decimal to normalised binary floating point: 01011000