Last 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 Recognise how sound is represented in a computer system ID: 340445
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Slide1
Do it now activity
Last 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?Slide2
Recognise how sound is represented in a computer system
Investigate how computers use metadata to re-create soundInvestigate how an increased sample rate could
affect efficiency
Learning
objectivesSlide3
Learning
outcomes
ALL
(
C
)
Explain how sound is represented on a computer using binary
MOST(B)Explain how a computer would use metadata to re-create an imageSOME(A)Explain what effect sample rate has on file size and sound quality
By the end of this lesson you will
be able to ....Slide4
New Learning
Learning
objectives
What is sound?
Find a picture to represent sound on the eardrum
Amplitude
Frequency
MegahertzSoundAnalogueDigitising
Sampling
Pitch
Binary
Recognise how sound is represented in a computer system
Investigate how computers use metadata to re-create sound
Investigate how an increased sample rate could
affect
efficiencySlide5
New Learning
Learning
objectives
Amplitude and Frequency
Amplitude
Frequency
Megahertz
SoundAnalogueDigitisingSampling
Pitch
Binary
Recognise how sound is represented in a computer system
Investigate how computers use metadata to re-create sound
Investigate how an increased sample rate could
affect
efficiencySlide6
New Learning
Learning
objectives
Amplitude is how loud the sound is
Amplitude
Frequency
Megahertz
SoundAnalogueDigitisingSamplingPitchBinary
Recognise how sound is represented in a computer system
Investigate how computers use metadata to re-create sound
Investigate how an increased sample rate
could
affect
efficiencySlide7
New Learning
Learning
objectives
Amplitude
Frequency
Megahertz
Sound
AnalogueDigitisingSamplingPitchBinary
Frequency is how often the sound is
measured
This is measured in Hertz (Hz for short)
Frequency is also called pitch
Recognise how sound is represented in a computer system
Investigate how computers use metadata to re-create sound
Investigate how an increased sample rate could effect efficiencySlide8
New Learning
Learning
objectives
Amplitude
Frequency
Megahertz
Sound
AnalogueDigitisingSamplingPitchBinary
Recognise how sound is represented in a computer system
Investigate how computers use metadata to re-create sound
Investigate how an increased sample rate could effect efficiencySlide9
Learning
objectives
Talk Task
Is the sound
quiet or loud?
Is the sound low
or high pitched?
On your whiteboardsAmplitudeFrequency
Megahertz
Sound
Analogue
Digitising
Sampling
Pitch
Binary
Recognise how sound is represented in a computer system
Investigate how computers use metadata to re-create sound
Investigate how an increased sample rate could effect efficiencySlide10
Independent Task
Learning
objectives
1
0
2
0.5
3
0
4
-0.5
5
-1.5
6
-1
7
1
8
0.5
Computers use s
ampling
to re-create sounds
Amplitude
Frequency
Megahertz
Sound
Analogue
Digitising
Sampling
Pitch
Binary
Recognise how sound is represented in a computer system
Investigate how computers use metadata to re-create sound
Investigate how an increased sample rate could effect efficiencySlide11
Learning Development
Learning
objectives
Amplitude
Frequency
Megahertz
Sound
AnalogueDigitisingSamplingPitchBinary
Recognise how sound is represented in a computer system
Investigate how computers use metadata to re-create sound
Investigate how an increased sample rate could effect efficiencySlide12
Independent Task
Learning
objectives
Amplitude
Frequency
Megahertz
Sound
AnalogueDigitisingSamplingPitchBinaryAccess on Weebly Term 3 - Lesson 4
Complete the independent task based on the level you are working towards
Recognise how sound is represented in a computer system
Investigate how computers use metadata to re-create sound
Investigate how an increased sample rate could effect efficiencySlide13
Plenary
Learning
objectives
How is sampling a sound the same as digitising an image?
Amplitude
Frequency
Megahertz
SoundAnalogueDigitisingSamplingPitchBinaryRecognise how sound is represented in a computer systemInvestigate how computers use metadata to re-create soundInvestigate how an increased sample rate could effect efficiencySlide14
Learning
outcomes
ALL
(
C
)
Explain how sound is represented on a computer using binary
MOST(B)Explain how a computer would use metadata to re-create an imageSOME(A)Explain what effect sample rate has on file size and sound quality
By the end of this lesson you will
be able to ....