Patent Document ID: 4015087
Application ID: 05633142

Base Claim:
1. In a frequency spectrum analyzer having means for repetitively providing a plurality of successive signals, each corresponding to the energy in a different frequency range of a successive frequency spectrum of an input signal to be analyzed, apparatus for providing a real time spectrogram of said input signal consisting of a plurality of interval spectrograms each for a different one of said successive frequency spectrums, which spectrogram displays variations with respect to time in the energy thereof in each of said different frequency ranges, said apparatus comprising: means for generating a plurality of display control signals which are repetitive, the first of said plurality of control signals being repetitive at a rate corresponding to the repetition rate of said successive signals, the second of said plurality of control signals being repetitive at a rate corresponding to the repetition rate of said plurality of successive signals and having a period equal to the period of each of said interval spectrograms of a submultiple thereof, the third of said plurality of control signals being repetitive at a rate of a plurality of said successive spectrums, and means operated by said control signals for visibly displaying said successive signals along a raster which is defined in one direction by said first and third control signals and in a second direction, transverse to said first direction, by said second control signals whereby to produce a plurality of concatenated interval spectrograms which display the spectrogram of the input signal in real time.

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Claim 2:
2. The invention as set forth in claim 1 wherein said analyzer includes timing signal generating means for producing first timing signals concurrently with each of said successive signals, said display control signal generating means including: a. first sweep generator means operated by said first timing signals to produce, as said first control signals, first sweep signals concurrently with said first timing signals; b. second sweep generator means operated by said timing signals generating means after occurrence of a plurality of said first timing signals equal in number to the plurality of said successive signals which constitute an interval spectrogram for producing, as said second control signals, second sweep signals, and c. third sweep generator means operated by said timing signal generating means after occurrence of a plurality of said pluralities of said first timing signals for producing, as said third control signals, third sweep signals, and d. wherein said displaying means includes cathode ray tube means for providing said raster vertically in said second direction in response to said second sweep signals and horizontally in said first direction in response to said first and third sweep signals.