Represent text sound and graphics Flashcards

1
Q

What does ASCII stand for?

A

American Standard Code for Information Interchange

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2
Q

How many bits does ASCII use?

A

7

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3
Q

How is it structured?

A

A-65 s mall a-97

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4
Q

What is a character set?

A

A list of characters recognised by software and hardware

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5
Q

What is the 8th bit for

A

Error checking(even number of 0’s and 1’s)

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6
Q

Give 1 benefit of the extended ASCII code

A

additional £ sign

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7
Q

What was the task of UNICODE?

A

To create a character set used globally

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8
Q

What is ord used for?

A

To find out a character’s ASCII code

e.g. ord(“A”)is 65

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9
Q

What is difference between amplitude and frequency?

A

Amplitude is how loud the noise is but frequency is how long it is

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10
Q

What does the microphone do?

A

Converts sound to electrical energy

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11
Q

What is the sound-card responsible for?

A

Converting electrical signal from microphone to binary signal

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12
Q

What is sample rate?

A

Samples sound wave at regular intervals

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13
Q

What are the steps?

A

1.Sound waves are analogue so changes continuously
2.To record sound it is first recorded with a microphone
which converts sound energy to electrical energy
3. Analogue electrical signal sampled at regular intervals-sample rate by the sound card
4. At each sampling the value of electrical signal is rounded up or down.And binary value point is recorded.

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14
Q

How do you work out file size

A
File size (bits)=Sample rate(Hz)*Sample resolution
 *Length(sec)
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15
Q

What are pixels?

A

Small dots that make up a bitmap image

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16
Q

How do you work out file size in images?

A

File size(bits)=image resolutioncolour depth=width* height*colour depth