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麥克風及音頻設備檢測項目報價???解決方案???檢測周期???樣品要求? |
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本標準規定了用于減輕、補償殘疾的環境控制系統的功能和技術要求及試驗方法。本標準的目的是為環境控制系統的生產商給出安全要求和建議。本標準不包括目標設備。系統內連接的設備技術要求應遵循各自的特定標準,如可調床。
GB/T 29265的本部分規定了設備間在資源共享協同服務的基礎協議下實現音頻設備之間媒體數據資源共享和協同服務的應用框架、設備交互流程模式,以及設備間交互過程中的請求和響應的消息格式及設備提供服務的描述格式。本部分適用于各種具有網絡連接的音頻設備,如家庭多房間音響、高保真音響、家庭影院、智能化收音機、背景音樂、公共音響等,實現家庭和移動音頻設備和音頻資源服務器之間音頻媒體數據流的資源共享和協同服務,并可實現多設備同步、音場配置和調校、音樂文件共享播放等音頻應用。
本標準規定了視聽設備中音頻系統的小損傷的主觀評價方法。本標準適用于產生小損傷的音頻系統的評價;其損傷足夠小,不依賴對測試條件的嚴格限制和適當的統計分析不足以覺察。本標準不適用于較大且易覺察的損傷的音頻系統,如果依據本標準將消耗較多時間和精力且得出的結果并不比簡單測試更可信。
本部分規定了工作頻率在9kHz~40GHz頻段范圍內的短距離無線電設備及其關聯的輔助設備的電磁兼容性(EMC)限值、性能判據和測量方法等。對于不適合在實驗室環境下測試的特定產品(如大功率無線電發信機),可對其進行現場測試。在此情況下,如果沒有適用的現場試驗的標準和方法,那么用于評估受試設備EUT測量方法的基本原理和限值應與本部分的規定相一致。
本標準規定了電力行業應急指揮中心場所、基礎支撐系統、應用系統、應急指揮信息接入的技術條件。本標準適用于電力行業應急指揮中心的規劃、設計、建設和改造。
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.