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COMMUNICATIONS
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COMMUNICATIONS
1. Elements of communication2. How does communication travel?3. Communication through sound waves
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Elements of Communication
transmitter receiver
www.tecno12-18.com Message: information sent in a communication
channel
How does communication travel?
isvr.soton.ac.uk
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Sound waves cables
Communication through sound waves
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What’s a sound wave?
• A sound wave is a disturbance which travels through space .
• The waves carry signals from one place to another
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Representation of sound waves
• They are usually represented as wavy lines
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Parts of a sound wave crest
axis
trough Axis: the line running through the middle of the wave patern.Crest: the top part of a waveTrough: the lowest part of a wave
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Characteristics of a sound wave
CYCLE`:Part of a wave that is continuously repeated
Amplitude (A):The distance from the axis to the top of the crest or the bottom of the troughWavelenght(λ):Distance between two adjoining crests
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Wavelength (λ)
amplitude(A)
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FREQUENCY• Frequency (f): number of waves per second• Mesure of frequency: Hertz(Hz)
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Relationship between Wavelength and Frequency
• Short wavelength high frequency.
• Long wavelenght low frequency.