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1、 CEA Standard Intermediate Frequencies for Entertainment Receivers CEA-109-D November 2004 Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:50:24 MDTNo reproduction or networking permi
2、tted without license from IHS -,-,- NOTICE CEA Standards, Bulletins 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 pu
3、rchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards, Bulletins and other technical publications shall not in any respect preclude any member or nonmember of CEA from manufacturing or selling products not conforming to such Sta
4、ndards, Bulletins or other technical publications, nor shall the existence of such Standards, Bulletins and other technical publications preclude their voluntary use by those other than CEA members, whether the standard is to be used either domestically or internationally. Standards, Bulletins and o
5、ther technical publications are adopted by CEA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, CEA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard, Bulletin or other tech
6、nical publication. This CEA Standard is considered to have International Standardization implication, but the International Electrotechnical Commission activity has not progressed to the point where a valid comparison between the CEA Standard and the IEC document can be made. This Standard does not
7、purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. (From Proj
8、ect Number 2128, formulated under the cognizance of the CEAs R4 Video Systems Committee.) Published by CONSUMER ELECTRONICS ASSOCIATION 2002 Technology Phone 800-854-7179; Fax 303-397-2740; Internet http:/; Email Federal Communications Commission (FCC) Regulations: U.S. Code of Federal Regulations
9、(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 Receivers 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.
10、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 analog or digital television receivers, the (one) filter performing the IF function is typically centered on 44 MHz. In the case of double-c
11、onversion 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 rejection of interference (e.g., image frequencies). Such double-conversion receivers typically have a second IF, typically with much narrower band
12、width, 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.g., to facilitate analog-to-digital conversion), but such lower frequencies are not considered IFs as CEA-109-D defines IF. By using 44 MH
13、z as the first IF, analog television receiver designs benefit from associated protections built into the FCC channel assignments. In addition, both analog and digital television receiver designs benefit from the identification of TV-IF spectrum that could be vulnerable to interference from any new s
14、ervices that might seek to use this band. Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:50:24 MDTNo reproduction or networking permitted without license from IHS -,-,- CEA-109-D 2 5
15、.1 IFs for Single Conversion Analog NTSC Television Receivers Single conversion analog NTSC television receivers 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.
16、In addition, 47 C.F.R. 73.682(a)(3) requires that the aural center frequency shall be 4.5 MHz higher than 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
17、Double Conversion Analog and Digital Television Receivers Both double conversion analog and digital television 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 co
18、nversion tuners should use the frequencies enumerated in Section 5.1 or 5.2 for the second IF. Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:50:24 MDTNo reproduction or networking p
19、ermitted without license from IHS -,-,- CEA 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 fill in the appropriate information below and email, mail or fax to: Consumer Electronics Association
20、 Technology & Standards Department 2500 Wilson Blvd. Arlington, VA 22201 FAX: 703 907-7693 standardsce.org Document No. Document Title: Submitters Name: Telephone No.: Submitters Company: FAX No.: e-mail: Address: Urgency of Change: Immediate: At next revision: Problem Area: a. Clause Number and/or
21、Drawing: b. Recommended Changes: c. Reason/Rationale for Recommendation: Additional Remarks: Signature: Date: FOR CEA USE ONLY Responsible Committee: Chairman: Date comments forwarded to Committee Chairman: Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IH
22、S Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:50:24 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resal
23、e, 03/30/2007 21:50:24 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:50:24 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:50:24 MDTNo reproduction or networking permitted without license from IHS -,-,-
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