The ray approach is adopted to study the acoustic field in theory, and the ultrasonic experiment has been carried out in laboratory to model the underwater waveguide.

理论上采用射线近似方法分析了时间反转声场特性，实验上在实验室内开展了水下波导的超声模拟实验。

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Ray-tracing method, which is one of the typical method in room-acoustic computer simulation, is discussed.

对房间声学计算机模拟方法中的经典方法之——声线跟踪法进行了分析。

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The application condition of inner quality testing of carbon material by ultrasonic, X ray and acoustic emission was introduced.

论述了超声波、 X射线及声发射三种无损检测方法在碳素材料内部质量检测中的应用状况。

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An optical-character-recognition machine for the blind that's capable of reading most types of printed text aloud, the CCD flatbed scanner, speech-recognition software, the first synthesizer that created sounds virtually indistinguishable from those produced by their acoustic counterparts, and a whole bunch of other nifty things we can barely comprehend came from Ray's brain.

CNN: STORY HIGHLIGHTS