Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Patent
1992-06-11
1992-12-29
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Measuring or testing of receiver
455324, 324 77R, H04B 1700, G01R 2316
Patent
active
051758806
ABSTRACT:
To analyse its spectrum, a radio signal is beat with an intermediate signal in a heterodyne circuit having a local oscillator sweeping a range of intermediate frequencies. The oscillator signal also beats with the output from a comb generator to produce signals marking intervals in its frequency sweep. The magnitude of the filtered intermediate frequency signal is measured between intervals marked by the frequency interval signals to output a frequency spectrum of the input signal. Preferably, the intermediate frequency signal is filtered in a homodyne demodulating unit employing a further local oscillator tuned to the intermediate frequency. A spectrum data display employs a memory storing the signal magnitudes at successive frequency steps at respective addresses associated with individual frequency steps. The magnitude values are assigned to their addresses by the spectrum frequency interval signals. For reading the stored data onto a two-dimensional magnitude: frequency display, control signals access the addresses and simultaneously step through the frequency dimension in the display. The signals read out from each address thereby generate magnitude values of the display which are located at their appropriate frequency positions by the control signals.
REFERENCES:
patent: 3634760 (1972-01-01), Murtin et al.
patent: 4253066 (1981-02-01), Fisher et al.
patent: 4430611 (1984-02-01), Boland
patent: 4672308 (1987-06-01), Leikus
Hiscocks, "Audio Spectrum Analyser", vol. 86 (1980), pp. 55-60.
Charouel Lisa
Eisenzopf Reinhard J.
Rolls-Royce plc
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