Theory and Implementation of a Splitband Modem Using the TMS32010
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1 Theory and Implementation of a Splitband Modem Using the TMS32010 APPLICATION REPORT: SPRA013 George Troullinos, Peter Ehlig, Raj Chirayll, Jon Bradley, Domingo Garcia Digital Signal Processor Products Semiconductor Group Texas Instruments Digital Signal Processing Solutions
2 IMPORTANT NOTICE Texas Instruments (TI) reserves the right to make changes to its products or to discontinue any semiconductor product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. TI warrants performance of its semiconductor products and related software to the specifications applicable at the time of sale in accordance with TI s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Certain application using semiconductor products may involve potential risks of death, personal injury, or severe property or environmental damage ( Critical Applications ). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. Inclusion of TI products in such applications is understood to be fully at the risk of the customer. Use of TI products in such applications requires the written approval of an appropriate TI officer. Questions concerning potential risk applications should be directed to TI through a local SC sales office. In order to minimize risks associated with the customer s applications, adequate design and operating safeguards should be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. Nor does TI warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. Copyright 1997, Texas Instruments Incorporated
3 TRADEMARKS TI is a trademark of Texas Instruments Incorporated. Other brands and names are the property of their respective owners.
4 CONTACT INFORMATION US TMS320 HOTLINE (281) US TMS320 FAX (281) US TMS320 BBS (281) US TMS320
5 Theory and Implementation of a Splitband Modem Using the TMS32010 Abstract This report discusses the theory and implementation of a bps splitband modem, the Bell 212A/V.22. Throughout the report, the terms Bell 212A and V.22 both refer to implemented modem. The report covers the following topics: Modem Functional Blocks Modem Transmitter Modem Receiver Modem Hardware Description Analog Interface Filters Data Converters Functions Implemented in the TMS32010 Transmit Filters Receive Filters AGC Implementation Carrier Recovery Implementation Baud Clock Alignment Implementation
6 SPRA013 Functions Implemented in the TMS7742 Asynchronous-to-Synchronous and Synchronous-to- Asynchronous Conversions Scrambler/Descrambler Performance Other Implementation Considerations Conclusions and References The report also includes the following appendixes: Appendix A Appendix B Appendix C Appendix D Appendix E Derivation of DM Structure Equations Effects of Nonideal Hilbert Transformers AGC Table Generator Code TMS32010 Source Code TMS7742 Source Code 6 Theory and Implementation of a Splitband Modem Using the TMS32010
7 SPRA013 Product Support World Wide Web Our World Wide Web site at contains the most up to date product information, revisions, and additions. New users must register with TI&ME before they can access the data sheet archive. TI&ME allows users to build custom information pages and receive new product updates automatically via . For technical issues or clarification on switching products, please send a detailed to dsph@ti.com. Questions receive prompt attention and are usually answered within one business day. Theory and Implementation of a Splitband Modem Using the TMS
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