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DAV Nguyên tắc và các ứng dụng P8

Tham khảo tài liệu 'dav nguyên tắc và các ứng dụng p8', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Digital Audio Broadcasting Principles and Applications. Edited by Wolfgang Hoeg Thomas Lauterbach Copyright 2001 John Wiley Sons Ltd ISBNs 0-471-85894-3 Hardback 0-470-84170-2 Electronic 8 The Receiving Side TORSTEN MLASKO MICHAEL BOLLE and DETLEF CLAWIN 8.1 General DAB is different from the traditional analogue audio broadcasting systems like AM and FM. For example DAB is a broadband transmission system transmitting several audio programmes and data channels over the same frequency. The frequency bands assigned for DAB broadcasting are different from the traditional broadcasting bands and are separated almost by a decade. The transport of the information audio and data also employs new concepts like audio compression see Chapter 3 . Therefore new receiver concepts had to be developed. Since the DAB system is fairly complex in terms of computational requirements it was evident that there was a need to design specific highly integrated chip-sets covering both the analogue and the digital parts of the system. These chip-sets are the building blocks for all kinds of DAB receivers and are the vital basis for cost-effective solutions. However owing to the rapid developments in PC technology modem PCs are able to handle the digital part of a DAB receiver. Today the various types of DAB receivers can be categorised as follows Car radios either audio only or audio and data receivers. PC-card receivers. Some of these solutions are completely hardware based whereas other implementations decode the digital part in software on the PC. Home receivers including HiFi tuners and kitchen radios. Portable receivers. Digital Audio Broadcasting Principles and Applications edited by W. Hoeg and T. Lauterbach 2000 John Wiley Sons Ltd. 214 Digital Audio Broadcasting Principles and Applications Monitor receivers for network monitoring. 8.1.1 Normative Receiver Requirements Several normative requirements related to DAB receivers have been standardised during the last few years. An overview