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麦克风及音频设备检测项目报价? 解决方案? 检测周期? 样品要求? |
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本标准规定了用于减轻、补偿残疾的环境控制系统的功能和技术要求及试验方法。本标准的目的是为环境控制系统的生产商给出安全要求和建议。本标准不包括目标设备。系统内连接的设备技术要求应遵循各自的特定标准,如可调床。
GB/T 29265的本部分规定了设备间在资源共享协同服务的基础协议下实现音频设备之间媒体数据资源共享和协同服务的应用框架、设备交互流程模式,以及设备间交互过程中的请求和响应的消息格式及设备提供服务的描述格式。本部分适用于各种具有网络连接的音频设备,如家庭多房间音响、高保真音响、家庭影院、智能化收音机、背景音乐、公共音响等,实现家庭和移动音频设备和音频资源服务器之间音频媒体数据流的资源共享和协同服务,并可实现多设备同步、音场配置和调校、音乐文件共享播放等音频应用。
本标准规定了视听设备中音频系统的小损伤的主观评价方法。本标准适用于产生小损伤的音频系统的评价;其损伤足够小,不依赖对测试条件的严格限制和适当的统计分析不足以觉察。本标准不适用于较大且易觉察的损伤的音频系统,如果依据本标准将消耗较多时间和精力且得出的结果并不比简单测试更可信。
本部分规定了工作频率在9kHz~40GHz频段范围内的短距离无线电设备及其关联的辅助设备的电磁兼容性(EMC)限值、性能判据和测量方法等。对于不适合在实验室环境下测试的特定产品(如大功率无线电发信机),可对其进行现场测试。在此情况下,如果没有适用的现场试验的标准和方法,那么用于评估受试设备EUT测量方法的基本原理和限值应与本部分的规定相一致。
本标准规定了电力行业应急指挥中心场所、基础支撑系统、应用系统、应急指挥信息接入的技术条件。本标准适用于电力行业应急指挥中心的规划、设计、建设和改造。
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.