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麥克風(fēng)及音頻設(shè)備檢測(cè)項(xiàng)目報(bào)價(jià)???解決方案???檢測(cè)周期???樣品要求? |
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本標(biāo)準(zhǔn)規(guī)定了用于減輕、補(bǔ)償殘疾的環(huán)境控制系統(tǒng)的功能和技術(shù)要求及試驗(yàn)方法。本標(biāo)準(zhǔn)的目的是為環(huán)境控制系統(tǒng)的生產(chǎn)商給出安全要求和建議。本標(biāo)準(zhǔn)不包括目標(biāo)設(shè)備。系統(tǒng)內(nèi)連接的設(shè)備技術(shù)要求應(yīng)遵循各自的特定標(biāo)準(zhǔn),如可調(diào)床。
GB/T 29265的本部分規(guī)定了設(shè)備間在資源共享協(xié)同服務(wù)的基礎(chǔ)協(xié)議下實(shí)現(xiàn)音頻設(shè)備之間媒體數(shù)據(jù)資源共享和協(xié)同服務(wù)的應(yīng)用框架、設(shè)備交互流程模式,以及設(shè)備間交互過程中的請(qǐng)求和響應(yīng)的消息格式及設(shè)備提供服務(wù)的描述格式。本部分適用于各種具有網(wǎng)絡(luò)連接的音頻設(shè)備,如家庭多房間音響、高保真音響、家庭影院、智能化收音機(jī)、背景音樂、公共音響等,實(shí)現(xiàn)家庭和移動(dòng)音頻設(shè)備和音頻資源服務(wù)器之間音頻媒體數(shù)據(jù)流的資源共享和協(xié)同服務(wù),并可實(shí)現(xiàn)多設(shè)備同步、音場(chǎng)配置和調(diào)校、音樂文件共享播放等音頻應(yīng)用。
本標(biāo)準(zhǔn)規(guī)定了視聽設(shè)備中音頻系統(tǒng)的小損傷的主觀評(píng)價(jià)方法。本標(biāo)準(zhǔn)適用于產(chǎn)生小損傷的音頻系統(tǒng)的評(píng)價(jià);其損傷足夠小,不依賴對(duì)測(cè)試條件的嚴(yán)格限制和適當(dāng)?shù)慕y(tǒng)計(jì)分析不足以覺察。本標(biāo)準(zhǔn)不適用于較大且易覺察的損傷的音頻系統(tǒng),如果依據(jù)本標(biāo)準(zhǔn)將消耗較多時(shí)間和精力且得出的結(jié)果并不比簡(jiǎn)單測(cè)試更可信。
本部分規(guī)定了工作頻率在9kHz~40GHz頻段范圍內(nèi)的短距離無線電設(shè)備及其關(guān)聯(lián)的輔助設(shè)備的電磁兼容性(EMC)限值、性能判據(jù)和測(cè)量方法等。對(duì)于不適合在實(shí)驗(yàn)室環(huán)境下測(cè)試的特定產(chǎn)品(如大功率無線電發(fā)信機(jī)),可對(duì)其進(jìn)行現(xiàn)場(chǎng)測(cè)試。在此情況下,如果沒有適用的現(xiàn)場(chǎng)試驗(yàn)的標(biāo)準(zhǔn)和方法,那么用于評(píng)估受試設(shè)備EUT測(cè)量方法的基本原理和限值應(yīng)與本部分的規(guī)定相一致。
本標(biāo)準(zhǔn)規(guī)定了電力行業(yè)應(yīng)急指揮中心場(chǎng)所、基礎(chǔ)支撐系統(tǒng)、應(yīng)用系統(tǒng)、應(yīng)急指揮信息接入的技術(shù)條件。本標(biāo)準(zhǔn)適用于電力行業(yè)應(yīng)急指揮中心的規(guī)劃、設(shè)計(jì)、建設(shè)和改造。
This Report is intended to review the effects of delay and level of echo in an audio foldback loop in a broadcast production context. It also reviews the effect of audio-video delay. It does not attempt to take into account the effect of additional reverberation and noise in the listening environment and assumes that there is no significant loss in signal quality from the monitoring system.
Recommendation ITU-T H.323 describes terminals and other entities that provide multimedia communications services over Packet-Based Networks (PBN) which may not provide a guaranteed Quality of Service.H.323 entities may provide real-time audio,video and/or data communications.Support for audio is mandatory, while data and video are optional,but if supported, the ability to use a specified common mode of operation is required,so that all terminals supporting that media type can interwork.
Recommendation ITU-T H.324 describes terminals for low bit-rate multimedia communication, utilizing ITU-T V.34 modems operating over the general switched telephone network(GSTN),I.400-series user-network interface for integrated services digital network (ISDN) or an appropriate wireless interface for mobile networks.ITU-T H.324 terminals may carry real-time voice,data and video,or any combination, including videotelephony.
This Recommendation specifies requirements for operational monitoring aimed to help minimizingvideo-to-audio delay, thus minimizing lip-sync errors in the transmission of television programs.
ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ ofthe ITU. The ITU-T is responsible for studying techn
This part of ISO 8253 specifies relevant test signal characteristics, requirements for free, diffuse, and quasi-free sound fields, and procedures for sound field audiometry using pure tones, frequency-modulated tones or other narrow-band test signals presented by means of one or more loudspeakers. The primary purpose is the determination of hearing threshold levels in the frequency range 125 Hz to 8 000 Hz, butThis range can be extended to 20 Hz to 16 000 Hz.