SAE J2366-1L-2001 ITS Data Bus.Low Impedance Stereo Audio (LISA).pdf
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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. TO PLACE A DOCUMENT ORDER: +1 (724) 776-4970 FAX: +1 (724) 776-0790 SAE WEB ADDRESS h
3、ttp:/www.sae.org Copyright 2001 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 RECOMMENDED PRACTICE J2366-1L ISSUED NOV2001 Issued2001-11 ITS Data BusLow Impedance Stereo Audio (LISA) TABLE OF CONTENTS 1.S
4、cope. 2 2.References. 2 2.1Applicable Publications 2 2.1.1SAE Publications 2 2.2Related Publications. 2 2.2.1SAE Publications 2 3.Definitions.2 3.1Audio Arbitration.2 3.2IDB-C2 3.3ITS 2 3.4LISA 2 3.5Receiver . 2 3.6Transmitter . 2 4.The LISA Bus . 3 4.1Transmitter . 3 4.1.1Number of Transmitters 3 4
5、.1.2Transmitter Output . 3 4.2Receiver . 4 4.3Bus Load Resistor4 4.4LISA Connections. 4 Appendix A LISA Circuit Examples5 A.1.1Transmitter Circuit 5 A.1.2Receiver Circuit 6 A.1.3Transceiver Circuit7 A.1.4Grounding Example 8 Figure A1Example Transmitter Circuit. 5 Figure A2Example Receiver Circuit. 6
6、 Figure A3Example Transceiver Circuit. 7 Figure A4System Grounding Example. 8 SAE J2366-1L Issued NOV2001 -2- Table 1Transmitter Types and Usage Profiles .3 Table 2Transmitter Parameters 4 Table 3Receiver Parameters 4 1.ScopeThis SAE Recommended Practice describes the Low Impedance Stereo Audio (LIS
7、A) bus, which may be used in conjunction with the Physical Layer of the IDB-C, as described in SAE J2366-1. The audio arbitration messages used to control access to the LISA bus are specified in SAE J2366-7. The IDB-C is a non-proprietary virtual token passing bus, designed to allow disparate consum
8、er, vehicle, and commercial electronic components to communicate and share information. 2.References 2.1Applicable PublicationsThe following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.
9、1.1SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001, or http:/ www.sae.org. SAE J2366-1ITS Data BusPhysical Layer SAE J2366-7ITS Data BusApplication Message Layer 2.2Related Publications 2.2.1SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale,
10、 PA 15096-0001, or http:/ www.sae.org. SAE J2355ITS Data BusArchitecture Reference Model Information Report SAE J2366-2ITS Data BusLink Layer SAE J2366-4ITS Data BusThin Transport Layer SAE J2590PMODE for In-Vehicle Networks 3.Definitions 3.1Audio ArbitrationAudio Arbitration is the process through
11、which a Transmitter requests and is granted permission to generate audio output onto the LISA bus. When used with the IDB-C, the Audio Arbitration mechanism and required messages are defined in SAE J2366-7. 3.2IDB-CThe IDB-C is a member of the ITS Data Bus (IDB) family of networks, defined by the SA
12、E J2366 series of documents. 3.3ITSIntelligent Transportation Systems 3.4LISALow Impedance Stereo Audio the subject of this document. 3.5ReceiverA Receiver is a device capable of accepting an analog audio input signal, e.g., audio amplifier, memo recorder. 3.6TransmitterA Transmitter is a device cap
13、able of generating an analog audio signal, e.g., CD-changer, wireless phone, text-to-speech synthesizer. SAE J2366-1L Issued NOV2001 -3- 4.The LISA BusThe LISA bus is designed to allow multiple Transmitters and Receivers to be “bussed” on a single unshielded twisted pair (UTP). One UTP is required f
14、or each LISA channel. A stereo configuration would therefore include 2 UTPs. Additional UTPs can be used for additional channels, as required. The LISA bus allows summing (mixing) of multiple Transmitters and Receivers, if desired, and is designed to be compliant with typical automotive EMC requirem
15、ents. When used with IDB-C, the Audio Arbitration mechanism defined in SAE J2366-7 controls access to the LISA bus. Appendix A shows examples of a LISA Transmitter, Receiver, and Transceiver circuit, and also provides an example of an overall system grounding method that can help to reduce interfere
16、nce and ground potential issues. 4.1TransmitterA Transmitter always presents high impedance to the LISA bus, regardless of whether it is actually generating any audio output (Active) or not (Inactive). Transmitters fall into the categories shown in Table 1: 4.1.1NUMBER OF TRANSMITTERSThe number of A
17、ctive Transmitters is limited by the Receiver input level and the type of audio transmitted by each Transmitter. It is theoretically possible to have 16 Active Transmitters providing that the Receiver input is not overloaded or the effects of clipping are not considered objectionable. The bus is spe
18、cified such that it is possible to have one full volume Type 1 or Type 2 source and one full volume Type 3 source Active at the same time. Additional sources or alternate combinations can be supported by reducing the lower priority sources to low volume or muted states. It is the responsibility of t
19、he audio arbiter to manage the output level of the Transmitters such that the total signal level on the bus is within the valid range and the final audio output is not objectionable to the listener. 4.1.2TRANSMITTER OUTPUTTransmitters must operate in a high impedance state. Transmitters shall not ca
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