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POWER MEASURING APPARATUS, POWER MEASUREMENT RESULT INDICATOR AND INDICATING METHOD, POWER MEASURING PROGRAM, AND RECORDING MEDIUM STORING POWER MEASUREMENT INDICATING PROGRAM
POWER MEASURING APPARATUS, POWER MEASUREMENT RESULT INDICATOR AND INDICATING METHOD, POWER MEASURING PROGRAM, AND RECORDING MEDIUM STORING POWER MEASUREMENT INDICATING PROGRAM
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机译:功率测量装置,功率测量结果指示符和指示方法,功率测量程序以及记录中型存储功率测量指示程序
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摘要
PROBLEM TO BE SOLVED: To realize a system for measuring power corresponding to an arbitrary frequency band through a simple arrangement. SOLUTION: When a QPSK modulation signal to be analyzed is inputted to a spectrum analyzer, it is converted at a frequency converting section 12 into an IF signal which is then passed through a band-pass filter 14 in order to remove aliasing component and converted into a digital data through an A/D converter 16. At a power calculating section 20, band limit processing through FIR filters 21, 22 is conducted simultaneously with processing for extracting the in-phase component I or the quadrature component Q through multiplication by a sine waveform or a 90 deg. phase-shifted waveform. They are squared at squaring sections 23, 24 and added at an adding section 25 to obtain a power value.
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