1. AM/FM Radio-Cassette System
Topics covered in this presentation:
Electromagnetic Waves
CD/MD/Cassette
Audio System
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2. Antenna Antenna receives radio signals Antenna Coaxial Cable
Metal rod or wire
Transfers signals and data to radio unit
Coaxial cable protects signal
Radio
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3. AM (Amplitude Modulating)
AM radio signal varies in amplitude. Changing amplitude contains audio information
AM frequencies range between 530kHz kHz
kHz
AM signals are reflected off ionosphere, producing large broadcast area
Mono quality only
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4. FM (Frequency Modulating)
FM signal varies frequency
Bandwidth between 88MHz to 108MHz
Broadcast range limited by line of sight
Stereo sound
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5. Cassette Player Iron oxide coating stores magnetic charge
Heads read signals and sound is amplified
Different parts of tape can be accessed
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6. CD Player
Made from special plastic containing reflective and non-reflective cells
Laser reads cell data
Better sound quality than tape
Quickly and easily finds required sections
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7. Minidisc Smaller than CD, but same length Digital quality
easily skip and select tracks
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8. Amplifier Enlarge small signals
Audio can be played louder without distortion
External amplifiers sometimes used
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9. Speakers - 1
Contains permanent magnet with coil mounted on diaphragm. Diaphragm moves, causing air pressure change
Speaker wires connect speaker to radio
Permanent magnet
Paper cone
Speaker Wire
Soft iron core
Movable wire coil
Thin wires
Flexible diaphragm
Connection terminals
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10. Speakers - 2 Speakers mounted in various places
Different speakers in different areas:
2-way - Driver/passenger doors
3-way - Rear parcel shelf
Tweeters - Small, high pitch sounds, on dashboard
Sub-woofers - Large, deep bass sounds, in trunk
3-way
Tweeters
Antenna
2-way
Sub-woofer
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11. Audio System Schematic
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12. Extras - 1 Stereos can contain many extras: RDS (Radio Data System)
Illumination
CD Text
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13. Extras - 2 Some other options include: Shock memory Remote control
Security features
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