Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Patent
1997-07-30
2000-10-31
Peng, John K.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
324 7624, 324 7619, 348180, 348181, 348190, 348191, 455 671, 4551922, 455263, 4552261, 342 20, 342 21, H04N 1700, G01R 1314, G01R 2300
Patent
active
061408093
ABSTRACT:
A received signal is converted in a frequency converter, an output from which is again frequency converted. The second converted output is detected by a detector and then converted into a digital signal to be stored in a memory. A spectrum display is provided by a display. A frequency sweep of local signals supplied to frequency converter is enabled. While holding the frequency sweep for the earlier stage suspended to receive one of the radio waves in service, a signal to the input of the frequency converter may be branched and demodulated by demodulation means. A vertical sync signal is separated in monitor processing means and the frequency of the local signal generator may be swept only during a no-modulation interval contained in a vertical blanking interval, thus extracting a carrier component and a noise component, the levels of which are determined to provide a measure of C/N.
REFERENCES:
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patent: 5736845 (1998-04-01), Kosuge
patent: 5869959 (1999-02-01), Tomikawa
Wireless PCS Personal Communications Services, Rajan Kuruppillai, Mahi Dontamsetti, Fil J. Cosentino, McGraw-Hill, 1997, (ISBN 0-07-036077-4), pp. v, viii, 236, and 237.
Advantest Corporation
Natnael Paulos
Peng John K.
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