1、 CEA Standard Standard Method of Measurement for Digital Versatile Disc-Video Players CEA-896-A R-2010 July 2010 NOTICE Consumer Electronics Association (CEA) Standards, Bulletins and other technical publications are designed to serve the public interest through eliminating misunderstandings between
2、 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 publications shall not in any r
3、espect preclude any member or nonmember of CEA 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 publications preclude their voluntary use by those other than CE
4、A members, whether the standard is to be used either domestically or internationally. Standards, Bulletins and other 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 p
5、atent owner, nor does it assume any obligation whatever to parties adopting the Standard, Bulletin or other technical publication. This CEA Standard is considered to have International Standardization implication, but the International Electrotechnical Commission activity has not progressed to the p
6、oint where a valid comparison between the CEA Standard and the IEC document can be made. This Standard 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 Standard to establish appropriate saf
7、ety and health practices and to determine the applicability of regulatory limitations before its use. (Formulated under the cognizance of the CEAs R10 Residential Systems Committee.) Published by CONSUMER ELECTRONICS ASSOCIATION 2010 Technology 1-800-854-7179 http:/ EIA/CEA Standards: Global Enginee
8、ring Documents, 15 Inverness Way East, Englewood, CO 80112-5776, USA; 1-800-854-7179 http:/ SMPTE Standards: Society of Motion Picture and Television Engineers; 595 West Hartsdale Avenue; White Plains, New York 10607 USA 1-914-761-1100 http:/www.smpte.org CEA-896-A 2 VESA Standards: Video Electronic
9、s Standards Association, 920 Hillview Court, Suite 140, Milpitas, CA 95035, USA; 1-408-957-9270 http:/www.vesa.org 2.2 Informative References 2.2.1 Informative Reference List 1. IRE Standards on Television: Methods of Testing Monochrome Television Broadcast Receivers, Proceedings of the IRE, Vol. 48
10、 No. 6, June 1960. 2. Jack, Keith; Video Demystified, HighText Publications. 3. NTC Report No. 7, Video Facility Testing Technical Performance Objectives, Network Transmission Committee of the Video Transmission Engineering Advisory Committee (Joint Committee of Television Network Broadcasters and t
11、he Bell System), June 1975 (Revised January 1976). 4. Robin, Michael and Michel Poulin; Digital Television Fundamentals, 2nd Edition, McGraw Hill. 5. Taylor, Jim; DVD Demystified, 2nd Edition, McGraw Hill. 6. Tektronix, Inc.; A Guide to Digital Television Systems and Measurements, Application Note 2
12、5W-7203-2; October 1996. 7. Tektronix, Inc.; Baseband Video Testing With Digital Phosphor Oscilloscopes, Application Note; 1998. 8. Tektronix, Inc.; Frequency-Response Testing Using a (SIN X)/X Signal and the VM 700A/T Video Measurement Set, Application Note 25W-11149-0; November 1996. 9. Tektronix,
13、 Inc.; Glossary of Video Terms and Acronyms, Application Note 25W-15215-0, January 23, 2002. 10. Tektronix, Inc.; NTSC Systems Television Measurements, Application Note 25W-7049-4; October 10, 2001. 11. Tektronix, Inc.; NTSC Video Measurements, Application Note 25W-7247-1A; July 1997. 12. Tektronix,
14、 Inc.; Solving the Component Puzzle, Application Note 25W-7009-2A; June 1997. 2.2.2 Informative Reference Acquisition HighText Publications: P.O. Box 1489, Solana Beach, CA 92075 IRE Standards: The Institute of Radio Engineers (IRE) merged with the American Institute of Electrical Engineers (AIEE) o
15、n January 1, 1963 to form the Institute of Electrical and Electronic Engineers (IEEE). Methods of Testing Monochrome Television Broadcast Receivers was renamed IEEE 190-1960, and has since been withdrawn by the IEEE, meaning that IEEE no longer endorses the standard. However, the old standard is ava
16、ilable from Global Engineering Documents at: CEA-896-A 3 Global Engineering Documents, 15 Inverness Way East, Englewood, CO 80112-5776, USA; 1-800-854-7179 http:/ McGraw-Hill Publications: McGraw-Hill Professional, 2 Penn Plaza, 12th Floor, New York, NY 10121-2298 1-800-262-4729 http:/www.books.mcgr
17、aw- NTC Reports: The NTC was the Network Transmission Committee of the Video Transmission Engineering Advisory Committee, a joint committee of television network broadcasters and the Bell System. NTC Report No. 7 is no longer in print. Check with your local technical library. Tektronix Application N
18、otes: Tektronix, Inc., 14200 SW Karl Braun Drive, P. O. Box 500, Beaverton, OR 97077 1-800-835-9433 http:/ 2.3 Definitions ATE Frequency List A list of test frequencies to be used when testing with automated test equipment. For the purposes of this standard, this list of frequencies is: 21, 30, 41,
19、50, 61, 80, 100, 181, 199, 300, 400, 499, 600, 700, 800, 900, 997, 1999, 3000, 4001, 5000, 6000, 7000, 7993, 9000, 10000, 11000, 12001, 13000, 13999, 15000, 16001, 17000, 18001, 19000 and 19997 Hz. Component Video Three signals Y (Luminance), Pr and Pb. The Y signal carries a luminance signal with a
20、 peak amplitude of 714 mV (100 IRE) plus a negative-going sync pulse of 286 mV conforming to the timing requirements of EIA/CEA-770.1-C. The sync pulse is the only timing reference for Y, Pr and Pb. Pr shall be amplitude scaled R-Y according to Pr = (R-Y)/1.772, and shall have a maximum peak amplitu
21、de, after scaling, of 350 mV ( 49 IRE) about blanking level. Pb shall be amplitude scaled B-Y according to Pb = (B-Y)/1.772, and shall have a maximum peak amplitude, after scaling, of 350 mV ( 49 IRE) about blanking level. Black level setup may be either none or 7.5 IRE 2 IRE from blanking level to
22、the reference white level. Further detail of the Component Video signal is contained in EIA/CEA-770.1-C. Composite Video A single signal consisting of five major parts (Y, I, Q, sync and burst). A detailed description is available in NTSC RS-170A and Part 73.699 of the FCC rules. Note that the toler
23、ances in RS-170A are slightly tighter than those in FCC Part 73.699. The following is basic data for the composite signal: Y = 0.3R + 0.59G + 0.11B; maximum peak amplitude including setup = 714 mV, which is 100 IRE; setup = 7.5 IRE, 3 IRE; I = 0.877(R-Y); and Q = 0.493(B-Y). I and Q ride 90 degrees
24、out of phase on a carrier at the burst frequency of 3.579545 MHz. Sync provides the timing for both horizontal and vertical sync. Maximum peak amplitude for sync is 286 mV, which is 40 IRE. Note: For DVDs setup is not used, but most players have the capability of creating and output signal with setu
25、p. CEA-896-A 4 Dialog Normalization A means of allowing the user (i.e., a consumer watching a DVD program) to set the audio output at a consistent level. This is accomplished by including a code in an AC-3 bitstream that indicates at what level the audio was recorded. The playback equipment then use
26、s this code, along with the setting that the user has selected for the output level, to determine how much audio amplification is needed for the program material being played. Dither Dither is a technique whereby white noise is added to an audio signal to reduce D/A quantizing distortion and prevent
27、 DACs from muting during tests of silence signals. Individual Frequency List A list of individual test frequencies. For the purposes of this standard, this list includes: 21, 41, 61, 121, 181, 199, 499, 997, 1999, 4001, 7993, 12001, 13999, 16001, 18001 and 19997 Hz. Rated Load Impedance The load imp
28、edance intended for connection to the output terminals of the DVD player under test. Rated Output Level The standard output level applied to the Rated Load Impedance. Root Mean Square The square root of the mean of the squares of a series of instantaneous values of a varying waveform, commonly abbre
29、viated as “RMS.” S-Video Two signals Y (luminance) and C (chroma). The Y signal carries a luminance signal with a maximum peak amplitude of 714 mV (100 IRE) plus a negative-going sync pulse of 286 mV. The sync pulse in the Y channel is the basic timing reference for both the Y and the C channels; ho
30、wever, the burst packet is carried on the C channel. Total Harmonic Distortion A measurement of all of the energy within a specified bandwidth at the plus Noise output of an amplifier when a single specific frequency is being fed into the input of the amplifier, minus the energy at that specific fre
31、quency at the output of the amplifier. 2.4 Symbols and Abbreviations AC Alternating Current A/D Analog-to-Digital ATE Automated Test Equipment cd/m2 Candelas per Square Meter CEA Consumer Electronics Association D/A Digital-to-Analog DAC Digital-to-Analog Converter DC Direct Current DN Dialog Normal
32、ization DVD Digital Versatile Disc HPF High Pass Filter IFL Individual Frequency List LFE Low Frequency Effects LPF Low Pass Filter LSB Least Significant Bit MSB Most Significant Bit nsec Nanoseconds PCM Pulse Code Modulation CEA-896-A 5 pF Picofarad (one farad x 10-12) RMS Root Mean Square S/N Sign
33、al-to-Noise Ratio THD+N Total Harmonic Distortion plus Noise TVL TV Lines sec Microseconds 2.5 Compliance Notation As used in this document, “shall” and “must” denote mandatory provisions of the standard. “Should” denotes a provision that is recommended but not mandatory. “May” denotes a feature who
34、se presence does not preclude compliance, and implementation of which is optional. “Optional” denotes items that may or may not be present in a compliant device. CEA-896-A 6 3 STANDARD TEST CONDITIONS When reporting the results of tests conducted in accordance with this standard the user shall note
35、that the measurements were made in accordance with CEA-896. If the user makes additional measurements that are not specified in this standard, then this shall be noted in the report. 3.1 Power Supply Requirements The supply voltage shall be within 1% of the rated supply voltage. Direct-current power
36、ed DVD players shall be tested at the recommended supply voltage 1%, and this voltage shall be stated. The supply voltage frequency in the case of AC operated DVD players shall be 50 or 60 Hz 2%. The supply voltage waveform shall be a sine wave with harmonic distortion no greater than 2.0%. For DC o
37、perated DVD players, the DC supply voltage waveform shall have a ripple content no greater than 0.1%. 3.2 Environmental Conditions Unless otherwise stated by the manufacturer or the laboratory conducting the test measurements, all measurements shall be made at an ambient temperature of 23 degrees Ce
38、lsius with relative humidity of 50%, 5%. Measurements may be made at any ambient temperature between 15 and 35 degrees Celsius, and a relative humidity between 45% and 75%, provided that no significant measurement error (i.e. no significant difference from the measurements at 23 degrees Celsius and
39、50% 5% relative humidity) results. 3.3 Equipment Preconditioning The unit to be tested shall be switched on for a period of 30 minutes prior to measurement, unless the omission of the stabilization time does not result in any errors. 3.4 Test Signals Test signals to be used for measurement of DVD pl
40、ayers shall be those described in this standard. 3.5 DVD Player Video Output Options Some DVD players have the option of compressing the picture content so that black video is delivered to the display device at either 7.5 IRE or 0 IRE. All measurements using the signals described in this standard sh
41、all be performed with the DVD player output set for 0 IRE black level, unless otherwise noted. 3.6 Audio Signal Levels The audio signal levels described in this standard are referenced to the maximum audio level that may be represented by the digital signal (e.g., 0 dB is the maximum audio level, wh
42、ich is represented by all bits being set to “1,” and -10 dB is 10 dB below that level.) If the DVD player under test has a volume control, tests shall be conducted with the volume control adjusted for maximum audio output. CEA-896-A 7 If the DVD player under test has other audio controls, such as lo
43、udness or automatic level controls, then the position of these controls must be indicated when data is reported. If no such indication is made in the report, it is assumed that any such features were turned off during testing. 3.7 Standard Load Impedance For video measurements, a load consisting of
44、a 75 ohm 0.25% resistor shall be connected to the video output terminal. For audio measurements, a load consisting of a 10,000 ohm 1% resistor in parallel with a 200 pF 5% capacitor shall be connected to each line output terminal. CEA-896-A 8 4 OUTPUT RESISTANCE MEASUREMENTS 4.1 Video Output Resista
45、nce This test measures the video output resistance of the player, which is typically 75 ohms. 4.1.1 Measuring system block diagram 4.1.2 Test pattern definition Many patterns will work. The white field might be the easiest to use because it produces maximum output level. 4.1.3 Measurement Method Use
46、 two resistors to determine the series resistance. Both resistors must be at or above the nominal load resistance (in this case 75 ohms). To minimize errors, try to use one load of 75 ohms and the other a higher value that is high enough to accurately measure a voltage difference, say 150 ohms. (One
47、 does not want to go lower than the rated impedance as this may cause the amplifier to saturate.) One probably does not want to go higher than, say, 200 ohms. The value of the resistors used is critical, and should be accurately known to within 0.25%. Measure the peak-to-peak voltage across each res
48、istor. This may be sync tip to white peak for example. Solve for the series resistance (internal resistance). As an example: VS = Source voltage RS = Source series resistance RL = Load resistance VL = Voltage across load Vs VL RL RS Test Disc DVD Player Video Amplitude Meter Picture Monitor CEA-896-
49、A 9 Ohms Law says that V = R * I, therefore: LLLS RVRRVs *)( Assume a 150 ohm load and a 75 ohm load. For a 150 ohm load: For a 75 ohm load: 150*)150( LS VRVs 75*)75( LS VRVs VS = VS, therefore: 75*)75(150*)150( )75()1 5 0( LSLS VRVR and 75 )75*()*(1 5 0 )1 5 0*()*( )75()75()1 5 0()1 5 0( LSLLSL VRVVRV and )75()75()1 5 0()1 5 0( 75 )*(1 5 0 )*( LSLLSL VRVVRVand 150 )*(75 )*( )1 5 0()75()75()1 5 0( SLSLLL RVRVVV Multiplying both sides by 75*150 gives: SLLLL RVVVV *)*75()*1 5 0()*1 1 2 5 0()*1 1 2 5 0( )1
