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Bandwidth Options for Analog AM Broadcasters September, 2007

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Bandwidth Options for Analog AM Broadcasters September, 2007 NRSC GUIDELINE NATIONAL RADIO SYSTEMS COMMITTEE NRSC-G100 Bandwidth Options for Analog AM Broadcasters September, 2007 NAB: 1771 N Street, N.W. CEA: 1919 South Eads Street Washington, DC 20036 Arlington, VA 22202 Tel: (202) 429-5356 Fax: (202) 775-4981 Tel: (703) 907-7660 Fax: (703) 907-8113 Co-sponsored by the Consumer Electronics Association and the National Association of Broadcasters http://www.nrscstandards.org NRSC-G100 NOTICE NRSC Standards, Guidelines, Reports and other technical publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards, Guidelines, Reports and other technical publications shall not in any respect preclude any member or nonmember of the Consumer Electronics Association (CEA) or the National Association of Broadcasters (NAB) from manufacturing or selling products not conforming to such Standards, Guidelines, Reports and other technical publications, nor shall the existence of such Standards, Guidelines, Reports and other technical publications preclude their voluntary use by those other than CEA or NAB members, whether to be used either domestically or internationally. Standards, Guidelines, Reports and other technical publications are adopted by the NRSC in accordance with the NRSC patent policy. By such action, CEA and NAB do not assume any liability to any patent owner, nor do they assume any obligation whatever to parties adopting the Standard, Guideline, Report or other technical publication. Note: The user's attention is called to the possibility that compliance with this Guideline may require use of an invention covered by patent rights. By publication of this Guideline, no position is taken with respect to the validity of this claim or of any patent rights in connection therewith. The patent holder has, however, filed a statement of willingness to grant a license under these rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such a license. Details may be obtained from the publisher. This Guideline does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Guideline to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. Published by CONSUMER ELECTRONICS ASSOCIATION Technology & Standards Department 1919 S. Eads St. Arlington, VA 22202 NATIONAL ASSOCIATION OF BROADCASTERS Science and Technology Department 1771 N Street, NW Washington, DC 20036 ©2007 CEA & NAB. All rights reserved. This document is available free of charge via the NRSC website at www.nrscstandards.org. Republication or further distribution of this document, in whole or in part, requires prior permission of CEA or NAB. Page 2 NRSC-G100 FOREWORD The NRSC adopted a 10 kHz standard analog AM audio bandwidth in 1986, which represented a “narrowing” of AM signals from the 15 kHz audio bandwidth which had been used up to that time. This action by the NRSC, embodied in the NRSC-1 Standard, came as a result of deliberations on the causes and cures of AM interference, and a desire to technically encourage the production of higher fidelity AM receivers. Nearly twenty years later, in 2004, as part of a review of the NRSC’s AM bandwidth standards, the NRSC’s AMB Subcommittee recognized that some broadcasters were reducing the audio bandwidth of their analog AM signals from the 10 kHz specified by the NRSC standards to 5-6 kHz, in an effort to further reduce interference in the band, and with the understanding that most consumer receivers are bandlimited to 5 kHz or less. Further, this bandwidth reduction was being done independent of the bandwidth reduction required when a broadcaster elects to transmit a hybrid AM in-band/on-channel (IBOC) digital radio signal. A proposal was put forth that the NRSC consider reducing the analog audio bandwidth specification to something less than 10 kHz, but the Subcommittee agreed that before such an action could be considered, a rigorous study of both analog AM receivers (characterizing, among other things, receiver bandwidth) and consumer reaction to reduced bandwidth would need to be conducted. Consequently, in late 2004 the Subcommittee formed the AM Study Task Group (AMSTG, co-chaired by Frank Foti, Telos/Omnia and John Kean, NPR Labs) to determine whether consumers would reliably perceive the audio quality differences of AM transmissions at various bandwidths, recorded through commercially available receivers, and whether these perceptions would affect consumers’ continued listening behavior. The AMSTG subsequently conducted a consumer subjective evaluation study of audio obtained from three typical receivers, as well as an objective evaluation of audio performance of a large number of current consumer analog AM receivers, including OEM and after-market car radios, shelf mini-systems, boom boxes, table radios and portables. The information contained in this NRSC Guideline is derived from the AMSTG study report and the resulting deliberations of the AMB Subcommittee of the NRSC, co-chaired by Stan Salek, Hammett & Edison, Inc., and Jeff Littlejohn, Clear Channel Broadcasting, Inc. The NRSC chairman at the time of adoption of NRSC-G100 was Milford Smith, Greater Media, Inc. The NRSC is jointly sponsored by the Consumer Electronics Association and the National Association of Broadcasters. It serves as an industry-wide standards-setting body for technical aspects of terrestrial over-the-air radio broadcasting systems in the United States. Page 3 NRSC-G100 CONTENTS 1 SCOPE ..............................................................................................................................................................5 2 REFERENCES..................................................................................................................................................5 2.1 Normative References ........................................................................................................... 5 2.2 Informative References ......................................................................................................... 5 2.3 Informative Reference Acquisition....................................................................................... 5 2.4 Symbols and Abbreviations.................................................................................................. 6 2.5 Definitions............................................................................................................................... 6 3 BACKGROUND................................................................................................................................................7 3.1 AM band adjacent channel interference problem............................................................... 7 3.2 Receiver bandwidth and the NRSC AM standards ........................................................... 10 3.3 AMSTG report – receiver characterization ........................................................................ 11 3.3.1 Receiver bandwidth measurements ............................................................................ 11 3.3.2 Impact of transmission bandwidth on signal-to-noise ratios ................................... 12 3.4 AMSTG subjective broadcast industry and consumer testing ....................................... 12 3.5 Interference considerations of hybrid AM IBOC signals ................................................. 14 4 AM ANALOG OPERATION WITH PASSBANDS LESS THAN 10 KHZ....................................................17 4.1 AM transmission preemphasis for analog AM systems with passband less than 10 kHz .................................................................................................................................... 18 4.2 Audio envelope stopband attenuation for analog AM systems with passband less than 10 kHz ................................................................................................................... 18 4.3 RF mask for analog AM systems with passband less than 10 kHz ................................ 18 ANNEX 1 - CONSUMER TESTING OF AM BROADCAST TRANSMISSION BANDWIDTH AND AUDIO PERFORMANCE MEASUREMENTS OF BROADCAST AM RECEIVERS FIGURES Figure 1. FCC analog AM mask ........................................................................................................... 7 Figure 2. Daytime reception of two hypothetical stations by listeners in two cities..................... 8 Figure 3. Illustration of interference from adjacent channel overlap of skywave signal – ±10 kHz signals, nighttime .................................................................................................................... 8 Figure 4. Illustration of interference from adjacent channel overlap of skywave signals from multiple stations – ±10 kHz signals, nighttime............................................................................. 9 Figure 5. Elimination of first adjacent channel energy overlap in skywave reception conditions – ±5 kHz signals, nighttime ......................................................................................... 9 Figure 6. Illustration of the rejection of adjacent channel interference as a
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