Do it now activity

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Do it now activityLast lesson we learnt about how images are stored on a computer.

Can a computer decide what colours to use in an image? How does a computer know what colours to use?

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Homework The History of ComputingResearch the WW2 Code Breakers, find out:

1. Who they were2. When they lived3. What they invented and what this did4. What impact this had on computing

Due:

1. Recognise how sound is represented in a computer system

2. Investigate how computers use metadata to re-create sound

3. Investigate how an increased sample rate could affect efficiency

LEARNING OBJECTIVES

LEARNING OUTCOMES

ALL(Level 5)

Explain how sound is represented on a computer using binary

MOST(Level 6)

Explain how a computer would use metadata to re-create an image

SOME(Level 7)

Explain what effect sample rate has on file size and sound quality

By the end of this lesson you will be able to ....

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New Learning

LEARNINGOBJECTIVES

What is sound?Find a picture to represent sound on the eardrum

AmplitudeFrequencyMegahertz

SoundAnalogueDigitising

SamplingPitchBinary

Recognise how sound is represented in a computer systemInvestigate how computers use metadata to re-create soundInvestigate how an increased sample rate could affect efficiency

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New Learning

LEARNINGOBJECTIVES

Amplitude and Frequency



SamplingPitchBinary


http://www.classzone.com/books/ml_science_share/vis_sim/wslm05_pg18_graph/wslm05_pg18_graph.html

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New Learning

LEARNINGOBJECTIVES

Amplitude is how loud the sound is



SamplingPitchBinary


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New Learning

LEARNINGOBJECTIVES



SamplingPitchBinary

Frequency is how often the sound is measuredThis is measured in Hertz (Hz for short)

Frequency is also called pitch

Recognise how sound is represented in a computer systemInvestigate how computers use metadata to re-create soundInvestigate how an increased sample rate could effect efficiency

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New Learning

LEARNINGOBJECTIVES



SamplingPitchBinary


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LEARNINGOBJECTIVES

Talk TaskIs the sound quiet or loud?

Is the sound low or high pitched?

On your whiteboards



SamplingPitchBinary


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Independent Task

LEARNINGOBJECTIVES

You have just done what the

computer does to reassemble an audio file.

To record a sound, the computer

SAMPLES (aka, measures) the sound at regular points, (frequency). Then it

converts the sample measurements into binary code.

2 1.5 1 0.5 0 -0.5 -1 -1.5 -2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

1 0 2 0.5 3 0 4 -0.5 5 -1.5 6 -1 7 1 8 0.5

Computers use sampling to re-create sounds



SamplingPitchBinary


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Learning Development

LEARNINGOBJECTIVES



SamplingPitchBinary


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Independent Task

LEARNINGOBJECTIVES



SamplingPitchBinary

Access on Weebly Term 3 - Lesson 4

Complete the independent task based on the level you are working towards


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Plenary

LEARNINGOBJECTIVES

How is sampling a sound the same as digitising an image?



SamplingPitchBinary


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LEARNINGOBJECTIVES

ALL(Level 5)

Understand how data, such as numbers, sound and images are physically stored on a computer

system.

Explain how sound is represented on a computer

using binary

MOST(Level 6)

Understand how instructions are run inside a computer

Explain how a computer would use metadata to re-

create an image

SOME(Level 7)

Understand how instructions can be written efficiently and be able to describe the efficiency of your

programs

Explain what effect sample rate has on file size and sound

quality



SamplingPitchBinary


Do it now activity

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