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Authorized meeting is in loudhailer state level south hold greatly
From;    Author:Stand originally
Came 27 days on May 23, 2008, authorized meeting is in the national level such as loudhailer, microphone, amplifier acoustics institute holds Nanjing university. This second conference is authorized include " loudhailer is main function checks a method " , " direct radiate type is dynamoelectric loudhailer is general and normative " , " microphone measurement technique " , " microphone is general and normative " , " measurement technique of acoustic frequency amplifier " , " imitate program signal " with " sound system equipment interrelates. Above standard is put forward by industry of People's Republic of China and informatization ministry, standardize technical committee to put in a mouth 's charge by countrywide frequency, video and multimedia system and equipment. The standard unit that draft includes Nanjing university the 797th acoustics of academy of product quality supervision and inspection of information of electron of province of acoustics institute, Jiangsu, Beijing Inc. , country phototube Inc. and favour of Shenzhen city a person of extraordinary powers are electroacoustic limited company of science and technology.

The conference by the Nanjing university that basically drafts one of people as the standard acoustics lab director Professor Shen Yong is in charge of acoustics institute frequency organization, acoustics institute Zhao Jichang teachs Nanjing college and Weng Tai comes to the 3rd institute of company of group of Chinese electron science and technology senior engineer is chaired authorized. Academy of product quality supervision and inspection of information of electron of province of head of deputy department of section chief of department of Nanjing university technology Professor Li Cheng, electron science and engineering department Professor Dou Saidan and acoustics institute director Professor Cheng Jianchun, Jiangsu, emphasize technical standard regarding communication international trade, protection as order of ethical industry, normative market, urge technical progress and implementation the important step of industrialization of new and high technology, mainer and mainer effect is being produced in economic society progress, national metric system edits the job has important sense.

Come from video and countrywide frequency, multimedia system and equipment to standardize company of group of science and technology of electron of technical committee, China designing institute of total bureau of wide report of the 3rd institute, state is acoustics university of place, Nanjing is acoustics the 797th acoustics of academy of product quality supervision and inspection of information of electron of province of institute, Jiangsu, Beijing Inc. , country phototube Inc. .

Develop quickly as the sound system facility that includes loudhailer, microphone and amplifier to wait inside, all sorts of new regulations, new method is continuous emerge in large numbers, and already became dimensions application, to suit and promote the development of these equipment products, edit this a series of national level is very necessary. " loudhailer is main function checks a method " the purpose is to give out characteristic explanation and use sine, appoint noise or pulse signal Shi Yangsheng implement relevant measurement technique, apply to the passive loudhailer in sound system; " direct radiate type is dynamoelectric loudhailer is general and normative " stipulated direct radiate type is dynamoelectric method of the product classification of loudhailer, requirement, experiment, test gauge criterion, mark, pack, keep in storage and carry, apply to the congener electron product such as receiver of broadcast radio, telecast, tape recorder, multimedia to use electric loudspeaker; " microphone measurement technique " design of the electric impedance that set sound system microphone, sensitivity, directivity, dynamic limits and the measurement technique that the outside affects, apply to all at the sound system microphone of language and music using; " microphone is general and normative " the classification that provided microphone, requirement, measurement technique, examine regular, mark is packed and keep in storage is carried etc, apply to the equipment of average sound system inside limits of frequency of language music enharmonic to use microphone; " measurement technique of acoustic frequency amplifier " the character that in setting amplifier standard, should give out and its corresponding measurement technique, the imitate amplifier that applies to compositive major or family expenses sound system and imitate / the imitate part in digital amplifier; " imitate program signal " the signal feature that provided imitate program signal, apply to of all kinds sound system and its equipment and the measurement with electroacoustic characteristic parts of an apparatus and demarcate; " the actor that sound system equipment interrelates is chosen deserve to receive a value " apply to the report when frequency, video and signal of imitate of equipment of system of seeing and hearing interrelate deserve to receive a value.
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