Importance

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Abstract

An analog waveform is sampled and converted into a digital form corresponding to the number of picture elements in the direction of main scanning of a raster scanning type display unit. The digital value thus obtained is stored in a memory which has the same number of addresses as the above-mentioned number picture elements. All memory locations are sequentially read out, for each main scan of the display unit. The data A.sub.1 contained in each location is compared to the number of the current scanning line B.sub.1 of the display unit. When the data read out, A.sub.1, equals the number, B.sub.1, a video signal is applied to the display unit, resulting in a bright spot being displayed on the display surface of the display unit. When a waveform video signal is formed, corresponding to the states of A=B or A>B, the area under the waveform is displayed by dots. The waveform display apparatus includes an apparatus for obtaining a digital value A' read from the memory at an address immediately preceding the address from which the digital value A is read out, comparing apparatus for detecting the states of A=B, A>B and A'>B, and apparatus for detecting non-coincidence between A>B and A'>B. When the video signal is formed using the A=B states, and the non-coincidence between A>B and A'>B, dots displaying a waveform are interpolated by additional dots to display the waveform as a continuous line.

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First Claim