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YDG50电动式高频纸盆扬声器
YDG50 Dynamic paper-cone tweeters
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扬声器可靠性要求及试验方法
Reliability requirement and testing methods for loudspeakers
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便携式喊话器通用技术条件
General specification for portable megaphone
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汽车收、放、扩音机测量方法
Measuring methods of car cassette player and audio amplifier
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汽车收、放、扩音机分类与基本参数
Classification and basic parameter of car radio casstte player and audio amplifier
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立体声耳机质量分等标准
Quality classification standard of stereophones
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助听器交货时质量检验的性能测量
Measurement of the performance characteristics of hearing aids for quality inspection for delivery purposes
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电影放映用扬声器系统 电声参数和测量方法
Electroacoustic parameters and testing methods of loudspeaker system for cinefilm projection
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