1、TIA/EIA STANDARD Electrical Performance for Television Transmission Systems TIA/EIA-250-C 1 (Revision of EIA-250-B) FEBRUARY 1990 1 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permi
2、tted without license from IHS-,-,-NOTICE TIA Engineering Standards and 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 select
3、ing and obtaining with minimum delay the proper product for their particular need. The existence of such Standards and Publications shall not in any respect preclude any member or non-member of TIA fi-om manufacturing or selling products not conforming to such Standards and Publications. Neither sha
4、ll the existence of such Standards and Publications preclude their voluntary use by Non-TIA members, either domestically or internationally. Standards and Publications are adopted by TIA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, TIA does not a
5、ssume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard or Publication. Further details of the development process are available in the TIA Engineering Manual, located at This Standard does not purport to address all safety problems associ
6、ated 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 Standards Proposal No. 3- 1742-RF 1, formulated u
7、nder the cognizance of the TIA TR- 14.1 O Subcommittee on Electrical Performance Standards for Television Relay Facilities.) This Document was reaffirmed by the American National Standards Institute (ANSI) on May 3,2001 and by the TIA. Published by OTELECOMMUNICATIONS INDUSTRY ASSOCIATION 1990 Stand
8、ards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U.S.A. PRICE: Please refer to current Catalog of TIA TELECOMMUNICATIONS INDUSTRY ASSOCIATION STANDARDS AND ENGINEERING PUBLICATIONS or call Global Engineering Documents, USA and Canada (1-800-854-7179) International (303-397-79
9、56) or search online at http:/www.tiaonline.org/standards/search-n-order.cfm All rights reserved Printed in U.S.A Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NOTICE OF DISCLAIMER AND
10、 LIMITATION OF LIABILITY The document to which this Notice is affixed (the “Document”) has been prepared by one or more Engineering Committees or Formulating Groups of the Telecommunications Industry Association (“TIA”). TIA is not the author of the Document contents, but publishes and claims copyri
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21、ided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A- -*- a o I O Lo Cu
22、I a i= EIA TIA-250-C 90 3234600 0008888 2 EIA/TIA STANDARD AN rned APPROVED: January 4,1990 Electrical Performance for Television Transmission Systems FEBRUARY 1990 ELECTRONIC IN DUSTWI ES ASSOCIATION ENGINEERING DEPARTMENT .T:ETf INDUSTRAY ASSOCIATION Copyright Electronic Industries Alliance Provid
23、ed by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA TIA-250-C 90 m 3234b00 0008889 4 m NOTICE EIA/TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manu
24、facturers 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 and Publications shall not in any respect preclude any member or no
25、nmember of EIA/TIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standards and Publications preclude their voluntary use by those other than EIA/TIA members, whether the standard is to be used either domestically or internat
26、ionally. Recommended Standards and Publications are adopted by EIA/TIA without regard to whether or not their adoption may involve patents on articles, materials, or processes. By such action, EIA/TIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to pa
27、rties adopting the Recommended Standard or Publication. This EIA/TIA Specification 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 EIA/TIA Specification an
28、d the IEC document can be made. This Specification 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 Specification to establish appropriate safety and health practices and to determine the a
29、pplicability of regulatory limitations before its use. APPROVED FOR USE IN THE NECQ SYSTEM FOR USE AS NQ/EIA/TIA-546AA00. COPYRIGHT I990 Published by ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department 2001 Pennsylvania Ave, N.W. Washington, D.C. 20006 (Temporary Headquarters 1722 Eye St., N.W.
30、 Washington, D.C. 20006) PRICE: $20.00 All rights reserved Printed in U.S.A. Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA TIA-250-C 90 m 3234600 0008890 O m , P ABSTRACT This Stan
31、dard specifies the transmission performance characteristics of tnnsmission systems that carry 525 line NTSC television signais intended for broadcasting service or related high-quality applications. Definitions! standards, and methods of measurement are given for both the video and related audio sig
32、nais being carried from a few hundred feet to thousands of miles, including satellite transmission. Although baseband performance is specified, transmission by any analog or digital technique or mixture thereof is anticipated. A comprehensive appendix of transmission considerations completes this do
33、cument. Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA TIA-250-C 90 m 3239600 0008891 2 m 4 ELECTRICAL PERFORMANCE STANDARDS FOR TELEVISION TRANSMISSION SYSTEMS TABLE OF CONTENTS Pa
34、ge No . INTRODUCTION 1 SCOPE 1 2 DEFINITIONS OF TELEVISION TRANSMISSION TERMS . 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 Television Transmission System . Television Signal Composite Video Signal . Short-Haul Transmission System . Medium-Haul Transmission System Long-Haul Transmission Syste
35、m . Satellite Transmission System . Digital Transmission System End-to-End Network . Repeater or Satellite . IRE . Average Picture Level 2 2 2 2 2 2 4 4 4 4 4 4 BASEBAND INTERFACE PARAMETERS 4 1. 2. 3 . 4 . 4.1 Video Signal Channel 4.1.1 Input Impedance . 4.1-2 Input Signal Level 4.1.3 Load Impedanc
36、e . 4.1.5 Output Signal kvel . Polarity of the Video Signal . 4.1.4 Output Impedance 4.1.6 4.1.7 Nonuseful DC Component 4.2 Audio Signal Channel 4.2.1 Input Impedance . Input Test Signal Level 4.2.3 Load Impedance 4.2.4 Output Impedance Output Test Signal Level . Polarity of the Audio Signal . 4.2.2
37、 4.2.5 4.2.6 5.0 PERFORMANCE CHARACTERISTIC SUMMARY 6 . PERFORMANCE CHARACTERISTICS OF THE VIDEO SIGNALCX?A.“ANL 6.1 Linear Distortions . 4 4 7 7 7 8 8 8 8 8 9 9 10 10 11 11 11 11 . ii - . Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or
38、 networking permitted without license from IHS-,-,-ELA TIA-250-C 90 W 3234600 0008892 4 W TABLE OF CONTENTS (Cont) 6.1.1 Amplitude Response as a Function of Frequency . 6.1.2 Linear Chrominance Distortion . 6.1.2.1 Chrominance-to-Luminance Gain Inequality (Relative Chrominance Level) 6.1.2.2 Chromin
39、ance-to-Luminance Delay Inequality (Relative Chrominance Time) 6.1.3 Envelope Delay Response as a Function of Frequency . 6.1.4 Field-Time Waveform Distortion 6.1.5 Line-Time Wavefoim Distortion 6.1.6 Short-Time Waveform Distortion . 6.1.7 Long-Time Waveform Distortion . 6.1.7.1 Damped Low-Frequency
40、 Distortion (Bounce) . 6.1.7.2 Line-by-Line DC Offset (Piano Keying) 6.1.8 Insei-tion Gain and Variation . 6. 2 Nonlinear Distortions . 6.2.1 Luminance Nonlinearity 6.2.2 Luminance-to-Chrominance Intermodulation 6.2.2.1 Differential Gain 6.2.2.2 Differential Phase 6.2.3 Chrominance-to-Luminance Inte
41、rmodulation 6.2.4 Chrominance Nonlinearity . 6.2.4.1 Chrominance Nonlinear Gain 6.2.4.2 Chrominance Nonlinear Phase 6.2.5 Dynamic Gain 6.2.5.1 Dynamic Gain of the Video Signal 6.2.5.2 Dynamic Variation of the Synchronizing Signal . . 6.2.6 Transient Synchronizing Signal Nonlinearity 6.3 Interference
42、 6.3.1 Signal-to-Noise Ratio . 6.3.2 Signal-to-Low Frequency Noise Ratio (Below 10 kHz) . . 6.3.3 Signal-to-Periodic Noise Ratio (300 Hz to 4.2 MHz) 6.4 Availability of the Video Signal . PERFORMANCE CHARACTERISTICS OF THE AUDIO SIGNAL CHANNEL . 7.1 O 7 . Amplitude Response as a Function of Frequenc
43、y O . Page No . 10 14 14 16 16 18 19 19 21 21 22 22 23 23 23 23 25 26 27 27 27 28 28 29 29 30 30 30 34 35 35 35 iii 2- Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TABLE OF CONTENTS (
44、Cont) 7.2 Total Harmonic Distortion . 7.3 Signal-to-Noise Ratio . 7.4 Insertion Gain . 7.5 15-krHz Audio Channels for Stereo Application Page No . 35 36 37 37 . _- EINTIA-250-C 7.5.1 Gain Difference Between Stereo A and B Channels . 7.5.2 Phase Difference Between Stereo A and B Channels 7.5.3 Crosst
45、alk Coupling Loss Between Stereo A and B Channels . Audio-to-Video Transmission Time Differential 7.6 7.7 Availability of the Audio Signal APPENDIX. Supplementary Information . 37 38 38 38 39 40 iv . Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo repr
46、oduction or networking permitted without license from IHS-,-,-I I. EIA TIA-250-c qo rn 323400 oooaq4 a 1EIM.U-250-C Page 1 ELECTRICAL PERFORMANCE STANDARDS FOR TELEVISION TRANSMISSION SYSTEMS (From Standards Proposal No PN-1742 formulated under the cognizance of EIA Subcommittee lX-14.10 on Televisi
47、on Transmission Systems) i. INTRODUCTION The intent of this standard is to specify the minimal transmission performance characteristics, consistent with good engineering practice, of television transmission systems for transmission of 525-line NTSC color or monochrome video and associated audio sign
48、als suitable for television broadcasting or for similar application. These limits are used for the acceptance of new systems or restoration of existing systems after maintenance. It should be noted that transmission systems utilize analog, digital, or a mixture of analog and digital techniques. 2, S
49、COPE This standard covers systems that transmit television signals by radio or metallic or optical cable using analog or digital techniques. There will be those systems used specifically for the transmission of television signals from a broadcasting studio to its associated television transmitter (studio to transmitter link or STL), or from a transmitting point
