Radio, Stereo, and Compact Disc: Description and Operation
AUDIO SYSTEMRADIO WAVE BAND
The radio wave bands used in radio broadcasting are as shown in the chart.
SERVICE AREA
There are great differences in the size of the service area for AM and FM broadcasting. Sometimes FM stereo broadcast cannot be received even through AM can be received very clearly. Not only does FM stereo have the smallest service area, but it also picks up static and other types of interference ("noise") easily.
COMPACT DISC PLAYER
Compact Disc Players use a laser beam pick-up to read the digital signals recorded on the CD and reproduce analog signals of the music, etc.
HINT: Never attempt to disassemble or oil any part of the player unit. Do not insert any object other than a disc into the magazine.
NOTE: CD players use an invisible laser beam which could cause hazardous radiation exposure. Be sure to operate the player correctly as instructed.
COMMUNICATION SYSTEM
A. What is AVC-LAN?
AVC-LAN is the abbreviation, which stands for Audio Visual Communication-Local Area Network. This is a unified standard co-developed by 6 audio manufactures associated with Toyota Motor Corporation.
The Unified standard covers signals, such as audio signal, visual signal, signal for switch indication and communication signal.
B. Objectives
Recently the car audio system has been rapidly developed and functions have been changed drastically. The conventional system has been switched to the multi-media type such as a navigation system. At the same time the level of customers needs to audio system has been upgraded. This lies behind this standardization.
The concrete objectives are explained.
1. When products by different manufactures were combined together, there used to be a case that malfunction occurred such as sound did not come out. This problem has been resolved by standardization of signals.
2. Various types of after market products have been able to add or replace freely.
3. Because of the above (2), each manufacture has become able to concentrate on developing products in their strongest field. This has enabled many types of products provided inexpensively.
4. Conventionally, a new product developed by a manufacture could not be used due to a lack of compatibility with other manufactures products. Because of this new standard, users can enjoy compatible products provided for them timely.
C. The above descriptions are the objectives to introduce AVC-LAN. By this standardization, development of new products will no longer cause systematic errors. Thus, this is very effective standard for a product in the future.
DIAGNOSIS FUNCTION
A. The audio system has diagnosis function (The diagnosis result is displayed on the LCD of the radio receiver assy). (Radio receiver with CD changer control function)
B. The component code (physical address), or three-digit number (in hexadecimal) is set for each component comprising AVC-LAN.
C. The logical address, or two-digit number (in hexadecimal) is set for each function and component unit in each component.