ITU-R BT 1871-2-2017 User requirements for wireless microphones.pdf
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1、 Recommendation ITU-R BT.1871-2 (12/2017) User requirements for wireless microphones BT Series Broadcasting service (television) ii Rec. ITU-R BT.1871-2 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency spectr
2、um by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are performed by World and Regional Radiocommunication C
3、onferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statemen
4、ts and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found. Series of ITU-R Recommendations (Also avai
5、lable online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed service M Mobile, radiodetermination, amateur and related satellite
6、 services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spectrum management SNG Satellite news gathering TF Time signals a
7、nd frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2017 ITU 2017 All rights reserved. No part of this publication may be reproduced, by any means
8、 whatsoever, without written permission of ITU. Rec. ITU-R BT.1871-2 1 RECOMMENDATION ITU-R BT.1871-2 User requirements for wireless microphones (Question ITU-R 121/6) (2010-2015-2017) Scope This Recommendation deals with user requirements for wireless microphones. It contains typical system paramet
9、ers and operational requirements for analogue and digital wireless microphones, which may be used by administrations and broadcasters when planning tuning ranges within the frequency bands allocated to broadcasting, fixed and mobile service. The ITU Radiocommunication Assembly, considering a) that s
10、eparate applications exist for broadcast and non-broadcast application of wireless microphones; b) that separate applications exist for news, sports, drama, light entertainment, studio and non-studio programme production within broadcasting use of wireless microphones; c) that there is a requirement
11、 within a wireless microphone system to assign a range of selectable frequencies to each system to permit frequency management and mitigate interference; d) that wireless microphones are currently assigned frequencies in bands allocated to the mobile service in Region 3 and those allocated to the br
12、oadcasting service in Regions 1 and 2, and many administrations are undertaking the transition from analogue to digital terrestrial television broadcasting; e) that wireless microphone systems are used in many countries, and are deployed for television production in other countries by national broad
13、casting organizations; f) that many administrations use TV Bands IV and V, which are also allocated to the mobile service in Region 3, as tuning ranges for professional wireless microphones; g) that it is desirable to minimize the potential for interference in these systems, while minimizing frequen
14、cy management resource requirements, mitigating interference and increasing global harmonization of the selectable frequencies, recommends 1 that the description of the user requirements and key characteristics of analogue and digital wireless microphones in Annex 1 should be referred to by administ
15、rations seeking to operate these applications in the frequency bands indicated; 2 that the tuning ranges and licensing arrangements for analogue and digital wireless microphones in Annex 2 should be referred to by administrations and broadcasters seeking information. 2 Rec. ITU-R BT.1871-2 Annex 1 U
16、ser requirements for wireless microphones Table 1 provides the description of the user requirements and key characteristics of analogue and digital wireless microphones which should be referred to by administrations seeking to operate these applications. TABLE 1 User requirements for radio/wireless
17、microphones Characteristics Specification Application Voice (speech, song), music instruments Transmitter Placement of a transmitter Body worn or handheld Power source Battery Transmitter RF-output power 10 to 100 mW Transmitter audio input Microphone level Receiver Placement of a receiver Fixed/cam
18、era mounted Power source a.c. mains/battery Receiver audio output Line level Receiver type Single or diversity General Battery/power pack operation time 4-8 h Audio frequency response 80 to 15.000 Hz Audio mode Mono RF frequency ranges TV Bands III/IV/V, 1.8 GHz Signal-to-noise ratio (optimal/possib
19、le) 100/119 dB Modulation Analogue FM wideband, Digital Shift QPSK RF peak deviation (AF = 1 kHz) 50 kHz RF bandwidth 200 kHz Number of useable wireless microphone channels per 8 MHz 12 Rec. ITU-R BT.1871-2 3 Annex 2 Tuning ranges of wireless microphones The tuning ranges of wireless microphones are
20、 intended to guide administrations and broadcasters seeking to operate analogue and digital wireless microphones and when considerations are made to frequency sharing with other services. Table 2 provides frequency bands and licensing arrangements within some administrations. TABLE 2 Frequency bands
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