热门搜索:

  • /?82
  • 下载费用:20 金币 ?

SSP-872603-VW Radio Systems大众音响系统.pdf

关?键?词:
SSP 872603 VW RADIO SYSTEMS 大众 音响系统
资源描述:

Service T raining Self-Study Program 872603 VW Radio Systems Volkswagen of America, Inc. ?Volkswagen Academy ?Printed in U.S.A. ?Printed 03/2007 ?Course Number 872603 ?2007 Volkswagen of America, Inc. All rights reserved. All information contained in this manual is ?based on the latest information available at the time of printing ?and is subject to the copyright and other intellectual property ?rights of Volkswagen of America, Inc., its affiliated companies ?and its licensors. All rights are reserved to make changes at ?any time without notice. No part of this document may be ?reproduced, stored in a retrieval system, or transmitted in any ?form or by any means, electronic, mechanical, photocopying, ?recording or otherwise, nor may these materials be modified ?or reposted to other sites without the prior expressed written ?permission of the publisher. All requests for permission to copy and redistribute information ?should be referred to Volkswagen of America, Inc. Always check Technical Bulletins and the latest electronic repair ?information for information that may supersede any information ?included in this booklet. Trademarks: All brand names and product names used in ?this manual are trade names, service marks, trademarks, or ?registered trademarks; and are the property of their respective ?owners.i Contents Note Important! This Self-Study Program provides information ?regarding the design and function of ?Volkswagen radio systems. This Self-Study Program is not a Repair Manual. ?This information will not be updated. For maintenance and repair procedures, ?always refer to the latest electronic ?service information. Basics............................................................................................ 1 Radio Systems ........................................................................... 12 Sound Systems ......................................................................... 54 Antenna Systems ...................................................................... 66 Glossary ..................................................................................... 73 Knowledge Assessment ............................................................ 77Page intentionally left blank iiBasics 1 Radio Reception in FM Range FM waves travel in straight lines. They are not ?reflected by the layers of the earth’s atmosphere and ?therefore do not follow the curve of the earth. ?The best reception is when the broadcasting antenna ?can “see” the car antenna. The FM signals, which ?are sent by the transmitter with horizontal or vertical ?polarization (depending on country), can be received ?best with an antenna that is mounted in a position ?that is open to sides (the signals “see” the full length ?of the antenna). A disadvantage of FM is that its range is lower than ?AM signals. If the vehicle is out of the range of the transmitter ?tower (the sound quality becomes poor and there is ?noise or interference), a different frequency should ?be selected. ?S342_001 S342_0042 Basics FM waves are reflected by building, hills etc. ?This results in reception from several directions ?(multipath). ?This can cause the direct signal to be deflected even ?in built-up areas or mountains. This reflection could ?cause poor quality reception. ?In some cases, the radio tuner picks up both the ?direct and also a reflected signal from the transmitter. ?This overlapping of the direct and reflected (delayed) ?signals can cause reception interference in the form ?of sound distortion in the speaker. Furthermore the ?time difference between the direct and indirect signal ?causes the reception quality to vary depending on ?the vehicle position. ?FM waves cannot pass through hills, buildings and ?similar obstacles without being impaired. If the ?vehicle enters such an area, only poor or no reception ?is possible. This occurs when you drive through ?mountains or between high-rise buildings. The range ?depends on the transmission power and the height of ?the transmitter antenna from the ground. Transmitter ?antennas are normally placed on towers, tall buildings ?or mountains. S342_002 S342_003 Deflected Indirect SignalsBasics 3 Antenna Properties ?Reception Properties of a Standard ?FM Antenna The blue area indicates the direction-related reception ?sensitivity of the antenna. Here you can see that the ?antenna is sensitive to signals from all directions. Highcut One way to reduce the interference is the “highcut ?method” . ?The disadvantage of this method is that ?“cutting” the high frequencies has a negative effect ?on the sound in this range (volume fluctuation high ?cut). The audio amplifier in the car radio amplifies all ?frequencies that can be heard by the human ear to a ?level appropriate to the human sensory range. ?Overhead View of Antenna Reflected FM Signal Direct FM Signal S342_006 Interference-Free Audio Signal S342_008 S342_007 Time Audio Frequency Receiving Level T echnical Suppression of Multipath ?Interference ?As multipath interference is unpleasant particularly ?in the higher audible frequency range, a technical ?solution to reduce interference is needed. 4 Basics If interference occurs in the upper frequency range ?due to multipath reception, it is suppressed by the ?highcut function in the FM tuner of the car radio. ?Disturbing Pulses Time Disturbing Pulse ?after Highcut Disturbing Pulse in ?Signal S342_009 S342_010 Audio Frequency Receiving Level Highcut Cuts Off High Frequencies If Interference Occurs Interference from Signal-Changing Disturbing Pulses Basics 5 Phase DiversityA better method of reducing interference is the ?phase diversity antenna principle. This reception ?type basically works in the same way as a directional ?antenna. During operation, these antennas are ?continuously “turned” virtually in the direction of the ?signal source. Turning the antenna is simulated by digital signal ?processing. The antenna is not actually rotated. ?However, the effect is exactly the same. The aim is ?to provide the direct signal with as much antenna ?surface as possible, and the reflected signal with as ?little as possible. The phase diversity is more technically complex than ?highcut, since it uses two tuners and two antennas. Signals from both antennas are digitized in an ?frequency analog/digital converter and processed ?using an adaptive algorithm. This process removes the ?interference signals by forming a new, directed antenna ?signal. The antenna power is also improved ? by up to 3 dB. S342_0116 Basics Signal Strength (dbμV) 60 50 40 30 20 Distance (ft) Diversity Antenna Another method of reducing interference is the ?Field Strength Diversity Antenna system, known ?as Diversity Antenna. This system is based on the ?fact that small changes in location can have great ?influence on FM reception. This is particularly ?noticeable when a car is stopped at a traffic light and ?moving the vehicle a few inches changes the radio ?reception. The vehicle shown in the diagram is equipped with ?two antennas at a distance of approximately 3 ft. The ?antenna in the front of the vehicle has a very high ?receiving level, and the rear one is very low, although ?the distance between the two antennas is relatively ?small. The Diversity Antenna system uses two antennas, ?mounted in different locations on the vehicle. The ?double-tuner radio unit automatically selects the one ?with better FM signal. This process is unnoticeable ?for the driver. A variation of this system uses four antennas, and ?the Antenna Selection Control Module J515. This ?module selects the two strongest signals out of the ?four antennas, and the double-tuner radio unit selects ?the one with better signal. S342_005Basics 7 Audio CD (Audio Compact Disk) ?Audio CDs are optical mass storage media for the digital storage of music. The analog music signal is converted to a digital ?signal by an analog/digital converter. To obtain a suitable signal from the digital signals for ?playback via the speakers, an analog signal needs ?to be formed again in the CD player using a digital/ analog converter. ?Analog Signal Analog/Digital ?Converter Digital Signal The aim of digitalization is to emulate the analog ?signal digitally and without interference in as small ?steps as possible. The higher the resolution ? (e.g. 8 -16 - 32 - 64 bit) of the analog/digital converter, ?the more authentic the sound result (emulation of the ?analog signal). S342_014 Digital/Analog ?Converter S342_0568 Basics The CD mainly consists of a transparent carrier ?material (substrate), which is molded by compression ?injection. ?The top side of this carrier contains the ?digital information in the form of microscopic pits and ?lands that are arranged in a single long, spiral track ?(around 3.1 miles or 5 km in length). ?This surface containing information is covered with ?a thin aluminium film and sprayed with an acrylic ?layer. A label can then be applied or printed on it. The ?information is scanned by a laser through the carrier ?layer without contacting it and therefore remains free ?of wear. ?Laser Diode Semi-Transparent Mirror Photo Diode S342_015 Land Pit SubstrateBasics  Handling and Care Information for CDs and CD-ROMs ?Touch a CD only by its sides. ?Avoid getting finger prints on the CD. If a CD is dirty, never wipe the CD with circular ?motions. Instead wipe from the inside to the outside ?with a soft lint-free cloth. ?Handle CDs carefully from both the underside and ?from the top. Do not write on the CD and do not ?affix labels. Adhesive labels can detach from the CD ?surface and jam the CD player mechanism. All CDs should be handled carefully and always be ?stored in a protective case. Also keep CDs away from ?heat and direct sunlight. ?S342_060 S342_061 S342_062 S342_063 S342_06410 Basics Moving Picture Experts Group ?(MPEG) MP3 MP3 is a file format for audio compression. Like ?other formats, MP3 is based on the fact that human ?perception is limited. The number of sounds that ?people can perceive is reduced because of frequency ?or volume of the sound. ?As this process involves losses, the original output ?signal cannot be reproduced completely. ?The losses depend greatly on the data rate. At around ?128 kBit/s, the differences from the original output ?are hardly noticeable in music with a low dynamic ?range (pop music, synthesizer, techno). ?For example, with guitar and violin music, you may ?notice annoying differences to the original at 128 ?kBit/s. ?Average data rates of 192 kBit/s or higher are ?recommended for this type of music. ?Non-audible frequencies, the range perceivable by ?adults is from 20 Hz to 18 kHz, are cut off in the ?frequency data. ?S342_037 S342_058 Frequency TimeBasics 11 Satellite Digital Audio Radio ?Service (SDARS) Satellite radio services in the United States started ?in 1992 when the U.S. Federal Communications ?Commission (FCC) allocated a spectrum in the ?“S” band (2.3 GHz) for nationwide broadcasting of ?Satellite-based Digital Audio Radio Service (SDARS). A Satellite Radio is a digital radio unit that receives ?signals broadcast by commercial communications ?satellite which covers a much wider geographical ?range than land-based radio signals. A central digital radio transmitter sends signals to ?commercial satellites that orbit the Earth. Digital radio ?signals are then transmitted to the in-vehicle satellite ?radio units. A number of land-based repeaters are ?located throughout the US, mostly in major cities, to ?avoid signal obstruction by buildings and tunnels. A in-vehicle satellite radio unit is composed by a ?specially designed antenna and a satellite receiver ?unit connected to the radio head unit. Each receiver has an Electronic Serial Number (ESN)- Radio ID to identify it. When a unit is activated with ?a subscription, an authorization code is sent in the ?digital stream notifying the receiver to allow access ?to the otherwise blocked channels. A monthly fee is ?charged for the services. Two companies dominate satellite radio: XM Satellite ?Radio and Sirius Satellite Radio. Volkswagen vehicles ?MY 2005 and 2006 have the option of either Sirius or ?XM satellite receiver. For vehicles Model Year 2007 ?and beyond, only Sirius receivers are available. Good Signal Quality Limited Signal Quality No Signal12 Radio Systems Premium 5.5 Radio without SDARS Volkswagen New Beetle/New Beetle Cabrio Single tuner Integrated single CD player Control for external 6-CD changer (optional) MP3 compatibility CD-R compatibility ? ? ? ? ? ? Eject the CD ?Pressing the On/Volume ?knob turns the radio on ?and off. Turning the knob ?adjusts the volume ?Select random play mode Store the 6 strongest ?radio stations on the ?current band Station presets 1-6 Radio mode: Pressing these buttons ?recalls the stored station Pressing and holding stores the ?current radio station CD mode: pressing these buttons ?selects a CD tray on the optional ?external 6-CD changer Scroll up or down radio ?stations (radio mode), CD ?tracks (CD mode) or folders or ?playlists (MP3 mode) Pressing this BASS ?button and turning the ?volume knob adjusts ?the bass Pressing this F/B button ?once and turning the ?volume knob adjusts the ?balance between front and ?rear speakers Pressing this button twice ?and turning the volume ?knob adjusts the balance ?between left and right ?speakers Pressing this MID ?button and turning ?the volume knob ?adjusts the middle ?frequencies Pressing this TREB button and ?turning the volume knob adjusts ?the trebleRadio SystemsRadio Systems 13 Recall the current ?title and artist ?(MP3 mode) Scroll up and down ?folders or playlists ?(MP3 mode) Select the integrated single ?CD player Briefly play stations ?(Radio mode) or tracks ?(CD or MP3 modes) Select FM band, or ?switch to the second set ?of presets Select AM band, or switch ?to the second set of presets Manually select radio ?frequencies (radio mode), CD ?tracks (CD mode) or tracks ?within a folder (MP3 mode) Select the optional ?external 6-CD changer P554 PS14 Radio Systems Functional Diagram for Premium 5.5 Baseline Radio Without SDARS Legend A Battery R ?Radio R11 ?Antenna R15 ?Left Rear Bass Speaker R17 ?Right Rear Bass Speaker R20 ?Left Front T reble Speaker R21 ?Left Front Bass Speaker R22 ?Right Front T reble Speaker R23 ?Right Front Bass Speaker R24 Antenna Amplifier R41 ?CD Changer S ?Fuse Input Signal Output Signal Voltage Supply (+) Ground (-) CAN Data Bus Line CAN Data Bus R20 R21 R15 R A+ SRadio Systems 15 R17 R23 R22 R41 R24 R1116 Radio Systems Eject the CD ?Pressing the On/Volume ?knob switches the radio ?on and off Turning the knob adjusts ?the volume ?Pressing this MID ?button and turning ?the volume knob ?adjusts the middle ?frequencies Pressing this BASS button ?and turning the volume knob ?adjusts the bass Pressing this F/B button ?once and turning the ?volume knob adjusts the ?balance between front and ?rear speakers Pressing this button twice ?and turning the volume ?knob adjusts the balance ?

? 汽车智库所有资源均是用户自行上传分享,仅供网友学习交流,未经上传用户书面授权,请勿作他用。
0条评论

还可以输入200字符

暂无评论,赶快抢占沙发吧。

关于本文
本文标题:SSP-872603-VW Radio Systems大众音响系统.pdf
链接地址:http://www.autoekb.com/p-2663.html
关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服客服 - 联系我们

copyright@ 2008-2018 mywenku网站版权所有
经营许可证编号:京ICP备12026657号-3?

收起
展开