1、 1 - Place des Nations Telephone +41 22 730 51 11 Telex 421 000 uit ch E-mail: itumailitu.int CH-1211 Geneva 20 Telefax Gr3: +41 22 733 72 56 Telegram ITU GENEVE www.itu.int Switzerland Gr4: +41 22 730 65 00 QUESTION ITU-R 121/6 Spectrum usage and user requirements for wireless microphones (2006) T
2、he ITU Radiocommunication Assembly, considering a) that separate 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 us
3、e of wireless microphones; c) that programme production may require the application of various technologies in the use of wireless microphone systems; d) that there is a requirement within a wireless microphone system to assign a range of selectable frequencies to each system to permit frequency man
4、agement and mitigate interference; e) that wireless microphones are currently assigned frequencies in present television systems and several administrations are undertaking the transition from analogue to digital terrestrial television broadcasting; f) that wireless microphone systems are used in ma
5、ny countries and are deployed for television production in other countries by national broadcasting organizations; g) that liaison status exists with the International Organization for Standardization (ISO)/International Electrotechnical Commission (IEC) working on their standardization of generic c
6、onsumer and non-consumer electronics devices; h) that it is desirable to minimize the potential for interference in these systems while maximizing frequency management, mitigating interference and increasing global harmonization of the selectable frequencies; j) that changes to the selectable freque
7、ncy ranges can only be introduced if compatibility with existing receivers, at least during a sufficiently long transition period, is retained, - 2 - C:DOCUMENTS AND SETTINGSQGV33745MY DOCUMENTSDOWNLOADSR-QUE-SG06.121-2006-MSW-E.DOC15/07/2010 decides that the following Question should be studied 1 W
8、hat are the operating characteristics for broadcast wireless microphone systems deployed in the frequencies currently allocated in the television broadcasting bands? 2 What are the optimum arrangements for frequency selection in wireless microphone systems for broadcast and non-broadcast application
9、 3 What steps can be taken for frequency management when broadcast use of wireless microphone systems is applied in bands allocated to broadcasting? 4 What method should be adopted for frequency selectivity in broadcast wireless microphone systems? 5 What transmission artefacts should be avoided in
10、 the design of broadcast wireless microphone systems? 6 What are the optimum bandwidth requirements for broadcast and non-broadcast wireless microphone systems? 7 What unified standards should be adopted in the design of broadcast wireless microphone systems to achieve global interoperability? further decides 1 that the results of the above studies should be addressed to prepare new Recommendations and Reports; 2 that the above studies should be completed by 2007. Category: S1
