泰国DAB法规 学习英语~
Technical Standard for Digital Broadcasting Radio
Receiver (NBTC BS 3004-2567)
- Scope
This standard specifies the technical requirements for digital broadcasting radio
receivers intended for use in Thailand. It covers the performance, safety, and
compatibility aspects of digital radio receivers. - Normative References
The following documents are referenced in this standard: - NBTC regulations on
radio frequency allocation - International standards for digital broadcasting -
Relevant safety standards for electrical equipment - Terms and Definitions
For the purpose of this standard, the following definitions apply:
3.1 Digital Broadcasting Radio Receiver A device capable of receiving and decoding
digital radio signals for audio playback.
3.2 DAB+ Digital Audio Broadcasting Plus, an enhanced version of the DAB standard. - Technical Requirements
4.1 General Requirements
4.1.1 The receiver shall be capable of receiving digital radio signals in the frequency
bands allocated for digital broadcasting in Thailand.
4.1.2 The device shall comply with all relevant electromagnetic compatibility
requirements.
4.2 Performance Requirements
4.2.1 Sensitivity The receiver shall have a minimum sensitivity of −98 dBm for
reliable reception.
4.2.2 Selectivity The receiver shall have adequate selectivity to reject adjacent
channel interference.
4.2.3 Audio Quality The audio output shall meet the following requirements: - Signalto-noise ratio: ≥ 60 dB - Total harmonic distortion: ≤ 3% - Frequency response: 50
Hz - 15 kHz (±3 dB)
4.3 Language Requirements
4.3.1 The receiver shall support Thai language display for all user interfaces.
4.3.2 The device shall be capable of displaying Thai characters correctly.
4.4 Safety Requirements
4.4.1 The device shall comply with electrical safety standards for household electrical
appliances.
4.4.2 The receiver shall not pose any electrical shock hazard to users. - Testing and Certification
5.1 Test Procedures
5.1.1 All tests shall be conducted in accordance with the procedures specified in this
standard.
5.1.2 Test equipment shall be calibrated and traceable to national standards.
5.2 Certification Requirements
5.2.1 Manufacturers or importers shall submit test reports from accredited
laboratories.
5.2.2 The device shall bear the NBTC certification mark when placed on the market. - Marking and Labeling
6.1 Required Markings
Each device shall be marked with: - Manufacturer’s name and address - Model
number - NBTC certification number - Power rating
6.2 User Documentation
6.2.1 The user manual shall be provided in Thai language.
6.2.2 The manual shall contain instructions for installation, operation, and
maintenance. - Conformity Assessment
7.1 Initial Assessment
7.1.1 The initial type approval shall be based on testing of representative samples.
7.1.2 The assessment shall verify compliance with all technical requirements.
7.2 Ongoing Compliance
7.2.1 Manufacturers shall implement quality control procedures to ensure ongoing
compliance.
7.2.2 NBTC reserves the right to conduct market surveillance and 抽检 (random
sampling). - Implementation and Enforcement
8.1 Effective Date
This standard shall be effective from the date of publication in the Government
Gazette.
8.2 Transitional Period
A transitional period of six months shall be provided for compliance.
Annex A: Test Methods
A.1 Sensitivity Test
A.1.1 Test Setup - Signal generator - Attenuator - Receiver under test
A.1.2 Procedure 1. Connect the signal generator to the receiver input 2. Set the
signal level to −98 dBm 3. Verify that the receiver can decode the signal with
acceptable audio quality
A.2 Adjacent Channel Rejection Test
A.2.1 Test Setup - Two signal generators - Combiner - Receiver under test
A.2.2 Procedure 1. Generate the desired signal at the nominal frequency 2. Generate
an interfering signal at the adjacent channel 3. Measure the receiver’s ability to
reject the interference
Annex B: Measurement Uncertainty
All measurements shall include uncertainty analysis in accordance with
international standards.
This standard is approved by the National Broadcasting and Telecommunications
Commission (NBTC) of Thailand.