1、 ANSI/CEA Standard Performance Specification for Public Alert Receivers ANSI/CEA-2009-B November 2010 NOTICE Consumer Electronics Association (CEA) Standards, Bulletins and other technical publications are designed to serve the public interest through eliminating misunderstandings between manufactur
2、ers 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 respect prec
3、lude 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 CEA members,
4、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 patent owner
5、, nor does it assume any obligation whatever to parties adopting the Standard, Bulletin or other technical publication. Note: The users attention is called to the possibility that compliance with this standard may require use of an invention covered by patent rights. By publication of this standard,
6、 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
7、obtain such a license. Details may be obtained from the publisher. 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 I
8、EC 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 safety and health practices and to determine the applicability of r
9、egulatory limitations before its use. (Formulated under the cognizance of the CEA R3 Audio Systems Committee.) Published by CONSUMER ELECTRONICS ASSOCIATION 2010 Technology Electromagnetic compatibility and Radio spectrum Matters (ERM); Enhanced Radio MEssage System (ERMES); Part 5: Receiver conform
10、ance specification; European Telecommunications Standards Institute (ETSI); November 1997. FCC Bulletin OST 55, “Characteristics of Open Field Test Sites;” Federal Communications Commission Federal Information Processing Standards (FIPS) Publication 6-4 for Counties and Equivalent Entities of the Un
11、ited States, its Possessions, and Associated Areas National Weather Service Instruction 10-1710, NOAA Weather Radio (NWR) Dissemination, October 1, 2002. 2.1.2 Normative Reference Acquisition ANSI/EIA/CEA Standards: Global Engineering Documents, World Headquarters, 15 Inverness Way East, Englewood,
12、CO USA 80112-5776; Phone 800-854-7179; Fax 303-397-2740; Internet http:/; Email ETSI Standards: European Telecommunications Standards Institute; 650 Route des Lucioles; Sophia Antipolis; Valbonne; FRANCE; Phone +33 4 92 94 42 00; Internet http:/www.etsi.org FCC Bulletins: Federal Communications Com
13、mission, Office of Engineering and Technology, Customer Service Branch, MS 1300F2, 7435 Oakland Mills Road, Columbia, MD 21046, USA; Fax: (301) 344-2050; Email: labinfofcc.gov; Internet http:/www.fcc.gov Federal Information Processing Standards: National Institute of Standards and Technology, Inform
14、ation Technology Laboratory, 100 Bureau Drive, Gaithersburg, MD 20899-3460; Internet http:/www.itl.nist.gov/ CEA-2009-B 2NOAA Standards: U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Weather Service, Office of Operational Systems, 1325 East West Highway, Silv
15、er Spring, MD 20910; Internet http:/www.nws.noaa.gov 2.2 Informative References and Acquisition NOAA Marine Zone Number Data Files at: http:/www.nws.noaa.gov/geodata/ (follow the link under “Code Listings for Special Applications: EAS and NWR“ to data files); NOAA Marine Zone Numbers: U.S. Departmen
16、t of Commerce, National Oceanic and Atmospheric Administration, National Weather Service, Office of Climate, Water and Weather Services, 1325 East-West Highway, Silver Spring, MD 20910-3283 2.3 Definitions Event Code The event code indicates the nature of the Public Alert activation. FIPS Codes A st
17、andardized set of numeric or alphabetic codes issued by the National Institute of Standards and Technology (NIST) to ensure uniform identification of geographic entities through all U.S. federal government agencies. The entities covered include: states and statistically equivalent entities, counties
18、 and statistically equivalent entities, named populated and related location entities (such as, places and county subdivisions), and American Indian and Alaska Native areas. Fixed Character Display A display device that has a limited number of character sets (e.g., a multi-segment display). Institut
19、ional Device A device that meets more stringent performance requirements as defined in this standard. Location Codes PSSCCC is the location code and indicates the geographic area affected by a SAME message. P defines all or a portion of a county or other SS subdivision. SS is the state or marine are
20、a or other equivalent identified by the U.S. National Weather Service (NWS) or the Meteorological Service of Canada (MSC). CCC is the SS subdivision as defined by the NWS or MSC. CCC may be defined as follows: FIPS numbers as described by the NIST publication ANSI INICTS 31200x Numbers for region, c
21、ounty, parish, district or cities as assigned Marine zone numbers as assigned by the NWS or the MSC. Rated Load Impedance The load impedance intended for connection to the output terminals of the receiver under test. Rated Output Level The standard output level applied to the Rated Load Impedance. R
22、oot Mean Square The square root of the mean of the squares of a series of instantaneous values of a varying waveform, commonly abbreviated as “RMS.” CEA-2009-B 3Specific Area Message Encoding A method of identifying a specific area for an alert by generating a digital data stream containing an alert
23、 message that has information about the type of alert, the time and duration of the alert, and the location of the alert based on the county or portion of the county (counties may be divided in up to 9 subsections). Total Harmonic Distortion A measurement of all of the energy within a specified band
24、width at plus Noise the output of an amplifier when a single specific frequency is being fed into the input of the amplifier, minus the energy at that specific frequency at the output of the amplifier. 2.4 Symbols and Abbreviations AC Alternating Current AFSK Audio Frequency Shift Keying CEA Consume
25、r Electronics Association CLC Canadian Location Code FIPS Federal Information Processing Standards (U.S.) ms Milliseconds MSC Meteorological Service of Canada NIST National Institute of Standards and Technology (U.S.) NOAA National Oceanic and Atmospheric Administration (U.S.) NWR NOAA Weather Radio
26、 (U.S.) NWS National Weather Service (U.S.) SAME Specific Area Message Encoding THD+N Total Harmonic Distortion plus Noise 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 mandat
27、ory. “May” denotes a feature whose 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. 3 Standard Test Conditions When reporting the results of tests conducted in accordance with this standard
28、the user shall note that the measurements were made in accordance with CEA-2009. 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 Normal AC Supply Voltage: The supply voltage shall be within 1% of
29、 120 V AC. Low (Brownout) Supply Voltage: The supply voltage shall be within 1% of 110 V AC. High (Over Voltage) Supply Voltage: The supply voltage shall be within 1% of 135 V AC. No (Blackout) Supply Voltage: The supply voltage shall be within 1% of 105 V AC. Direct Current: Direct-current powered
30、receivers 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 receivers shall be 60 Hz 2%. The supply voltage waveform shall be a sine wave with harmonic distortion no greater than 2.0%. For DC operated recei
31、vers, the DC supply voltage waveform shall have a ripple content no greater than 0.1%. CEA-2009-B 43.2 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 Celsi
32、us 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 50%
33、 5% relative humidity) results. 3.3 Equipment Preconditioning The unit to be tested shall be switched on under primary power for a period of 30 minutes prior to measurement, unless the omission of the stabilization time does not result in any errors. 3.4 Audio Signal Levels If the receiver under tes
34、t has a volume control, tests shall be conducted with the volume control adjusted for the maximum audio output level for which the THD+N does not exceed 10% within the frequency range 300-3,000 Hz. If THD+N never exceeds 10% then it shall be tested at the maximum audio output. If the receiver under
35、test has other audio controls, such as loudness 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. 3.5 Standard Load Impedance For
36、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. The measuring device shall be connected as specified by the vendor. 4 REQUIREMENTS TUNER SECTION Unless otherwise specified, all measurements shal
37、l be made under the standard test conditions described in Section 3, with output terminations in place. 4.1 Channel Availability The device shall be capable of receiving and successfully decoding signals on the following VHF FM frequencies: Channel Frequency 1 162.400 MHz 2 162.425 3 162.45 MHz 4 16
38、2.475 162.500 MHz 6 162.525 7 162.55 MHz 4.2 Channel Selection Methods The user shall be able to manually select the channel (this shall be the default channel selection mode). When a channel is selected the unit will automatically return to that channel on the next power up. If an automatic channel
39、 selection method is included may cause the unit to tune to the strongest RF signal available. If no single channel provides the strongest RF signal the unit shall select a single channel from among those multiple channels that provide the strongest signal level and use that channel CEA-2009-B 5as t
40、he default channel. If the unit is intended for mobile or portable use, the automatic channel selection method may be initiated at regular intervals, or at power up, to continually update the strongest signal. 4.3 Selectivity The adjacent channel selectivity is a measure of the capability of the rec
41、eiver to receive a wanted modulated signal without exceeding a given degradation due to the presence of an unwanted signal which differs in frequency from the wanted signal by an amount equal to the adjacent channel separation for which the equipment is intended. This specification shall not apply t
42、o receivers incorporating AFC (automatic frequency control). 4.3.1 Measuring system block diagram See Figure 1. Figure 1: Measuring System Block Diagram 4.3.2 Measurement method a) Two signal generators A and B shall be connected to the receiver under test via a combiner. b) The wanted signal, provi
43、ded by signal generator A, shall be at the nominal frequency of the receiver and be modulated with a 1 kHz tone at +/-3 kHz deviation. c) The unwanted signal, provided by signal generator B, shall be modulated with 400 Hz tone at +/-3 kHz deviation and shall be at the frequency of the channel immedi
44、ately above that of the wanted signal. d) Initially, the unwanted signal shall be switched off. e) The level of the wanted signal from generator A shall be adjusted to a level which the SINAD meter reading is 12 dB SINAD. f) Record the level of signal generator A as P1. g) Increase the signal genera
45、tor A level by 3 dB h) The unwanted signal from signal generator B shall then be switched on. i) Adjust the output level of signal generator B until the SINAD meter reading returns to 12 dB SINAD. j) Record the level of signal generator B as P2. k) Calculate selectivity by subtracting P1 from P2. l)
46、 The measurement shall be repeated with the unwanted signal at the frequency of the channel Signal Generator A Signal Generator B Combiner Receiver Under Test Audio Frequency Load/Acoustic Coupler SINAD Meter CEA-2009-B 6below that of the wanted signal. m) The adjacent channel selectivity of the equ
47、ipment under test shall be expressed as the lower of the two values calculated in step l) for the upper and lower channels nearest to the receiving channel. n) Selectivity shall be at least 50 dB. 4.4 Signal-to-Noise Ratio The S/N is measured under the following conditions: RF modulation: 1 kHz tone
48、 at +/- 3 kHz. RF level: 1 mV, for channels 1-7 A weighted or CCIT weighted RMS detection with line trap (15.734 kHz null filter is optional) De-emphasis. Measurement location: Line output (or speaker terminals) With standard test signal level applied, the ratio of rated audio power with standard te
49、st modulation to residual audio power with no modulation at the same volume setting shall be 37 dB. The method of measurement is a standard RF signal source with standard test modulation adjusted to a level of 1 mV connected to the receiver. Adjust the volume control to produce the rated audio output or the minimum level expected (200mW for consumer or 2 W for institutional devices). Turn off modulation and record the reduction in output level in dB. 4.5 Spurious Signal Rejection In addition to the response to a signal at
