ANSI CTA-109-D-2010 Intermediate Frequencies for Entertainment Receivers (Formerly ANSI CEA-109-D).pdf

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1、 ANSI/CTA Standard Intermediate Frequencies for Entertainment Receivers ANSI/CTA-109-D R-2015 (Formerly ANSI/CEA-109-D R-2015) May 2010 NOTICE Consumer Technology Association (CTA) Standards, Bulletins and other technical publications are designed to serve the public interest through eliminating mis

2、understandings 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, Bulletins and other technical publicati

3、ons shall not in any respect preclude any member or nonmember of the Consumer Technology Association from manufacturing or selling products not conforming to such Standards, Bulletins or other technical publications, nor shall the existence of such Standards, Bulletins and other technical publicatio

4、ns preclude their voluntary use by those other than Consumer Technology Association members, whether the standard is to be used either domestically or internationally. Standards, Bulletins and other technical publications are adopted by the Consumer Technology Association in accordance with the Amer

5、ican National Standards Institute (ANSI) patent policy. By such action, the Consumer Technology Association does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard, Bulletin or other technical publication. This document does not

6、purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this document to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. This docum

7、ent is copyrighted by the Consumer Technology Association and may not be reproduced, in whole or part, without written permission. Federal copyright law prohibits unauthorized reproduction of this document by any means. Organizations may obtain permission to reproduce a limited number of copies by e

8、ntering into a license agreement. Requests to reproduce text, data, charts, figures or other material should be made to the Consumer Technology Association. (Formulated under the cognizance of the CTA R4 Video Systems Committee.) Published by CONSUMER TECHNOLOGY ASSOCIATION 2015 Technology Phone 800

9、-854-7179; Fax 303-397-2740; Internet http:/; Email Federal Communications Commission (FCC) Regulations: U.S. Code of Federal Regulations (C.F.R.), U.S. Government Printing Office, Washington, D.C. 20401; http:/www.access.gpo.gov/nara/cfr/cfr-table-search.html 3 IFs for Analog FM Broadcast Receiver

10、s FM broadcast receivers typically use 10.7 MHz as the IF. NOTEThis is consistent with the FCC channel spacing requirements in 47 C.F.R 73.207(b). 4 IFs for Analog AM Broadcast Receivers AM broadcast receivers typically use 455 kHz or 450 kHz as the IF. 5 Television Receivers For single-conversion a

11、nalog or digital television receivers, the (one) filter performing the IF function is typically centered on 44 MHz. In the case of double-conversion analog or digital television receivers, a translation of the input signal to a higher first IF may occur, and this may be associated with some rejectio

12、n of interference (e.g., image frequencies). Such double-conversion receivers typically have a second IF, typically with much narrower bandwidth, and typically centered on 44 MHz. Further translation of the 44 MHz IF output to lower frequencies may occur at the discretion of the receiver designer (e

13、.g., to facilitate analog-to-digital conversion), but such lower frequencies are not considered IFs as CEA-109-D defines IF. By using 44 MHz as the first IF, analog television receiver designs benefit from associated protections built into the FCC channel assignments. In addition, both analog and di

14、gital television receiver designs benefit from the identification of TV-IF spectrum that could be vulnerable to interference from any new services that might seek to use this band. 1 CEA-109-D 5.1 IFs for Single Conversion Analog NTSC Television Receivers Single conversion analog NTSC television rec

15、eivers shall use 41.25 MHz as the IF for the sound carrier and 45.75 MHz as the IF for the picture carrier. NOTEThis is consistent with the FCC channel spacing requirements in 47 C.F.R. 73.698. In addition, 47 C.F.R. 73.682(a)(3) requires that the aural center frequency shall be 4.5 MHz higher than

16、the visual carrier frequency. 5.2 IFs for Single Conversion Digital Television Receivers Single conversion digital television receivers typically occupy an IF between 41 and 47 MHz. 5.3 IFs for Double Conversion Analog and Digital Television Receivers Both Double conversion analog and digital televi

17、sion receivers should use frequencies above 894 MHz for the first IF. NOTEThere is a band used by unlicensed transmitters at 902-928 MHz. Concerning power usage, see 47 C.F.R. Part 15. Double conversion tuners should use the frequencies enumerated in Section 5.1 or 5.2 for the second IF. 2 Consumer

18、Technology Association Document Improvement Proposal If in the review or use of this document a potential change is made evident for safety, health or technical reasons, please email your reason/rationale for the recommended change to standardsce.org. Consumer Technology Association Technology & Standards Department 1919 S Eads Street, Arlington, VA 22202 FAX: (703) 907-7693 standardsce.org