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This standard describes a method of measuring the amplitude levels of an SMPTE 170M-1994,1 NTSC color or monochrome television video signal. It is concerned with luminance measurements at various points in transmission systems where the signals are at video frequencies. The methods described in this standard are limited to the use of waveform monitors, software video processing for amplitude assessment, or suitable oscilloscopes, and are primarily directed to specifying means of measuring… read more television signal levels for operating purposes. read less

定价： 141元 / 折扣价： 120 元

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This recommended practice presents a rationale for developing emission limits and immunity test levels and recommends that these facets are representative of current practice and user needs. Emission limits generally are written by national and international standards bodies. Emission limits for the most part are specified by regulators, which is the case in the U.S. and Canada. Such regulatory limits take precedence, even if the limits are different from those considered in this document. In the U.S. and Canada, product immunity is not regulated except for some safety equipment. In this way, adequate immunity is more a quality aspect of the product as if it does not operate in its intended RF environment, the user would deem it of poor quality. It should be noted that the entire document does not impose normative requirements, but recommends options.

定价： 65元 / 折扣价： 56 元

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This standard provides a general intelligence level architecture for smart home devices, in order to stipulate their capabilities equipped by various sensors, hardware and software. The standard specifies home device intelligence capabilities mainly from seven aspects, including computation, perception, cognition, motion, coordination, skills, and security. -The computation comprises of computing, memory, storage, and network components. -The perception includes speech and vision. -The… read more cognition is enabled by natural language processing and other related technologies. -The motion involves decision-making and route planning. -The coordination describes how the device interacts with others. -The skills refer to study, education, entertainment, and others based on the type and domain of devices. -The security includes electromagnetic compatibility and system security. read less

定价： 58元 / 折扣价： 50 元