AM/FM Radio-Cassette System Topics covered in this presentation: Electromagnetic Waves CD/MD/Cassette Audio System next
Antenna Antenna receives radio signals Antenna Coaxial Cable Metal rod or wire Transfers signals and data to radio unit Coaxial cable protects signal Radio next
AM (Amplitude Modulating) AM radio signal varies in amplitude. Changing amplitude contains audio information AM frequencies range between 530kHz - 1610kHz 530-1610kHz AM signals are reflected off ionosphere, producing large broadcast area Mono quality only next
FM (Frequency Modulating) FM signal varies frequency Bandwidth between 88MHz to 108MHz Broadcast range limited by line of sight Stereo sound next
Cassette Player Iron oxide coating stores magnetic charge Heads read signals and sound is amplified Different parts of tape can be accessed next
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 next
Minidisc Smaller than CD, but same length Digital quality easily skip and select tracks next
Amplifier Enlarge small signals Audio can be played louder without distortion External amplifiers sometimes used next
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 next
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 next
Audio System Schematic next
Extras - 1 Stereos can contain many extras: RDS (Radio Data System) Illumination CD Text next
Extras - 2 Some other options include: Shock memory Remote control Security features end