Method for quickly adjusting the waveform brightness of digital three-dimensional oscilloscope

摘要

A method for adjusting the waveform brightness for a waveform formatted to be displayed on a digital three-dimensional (3D) oscilloscope having M brightness gradation levels to display the waveform on a digital 3D oscilloscope having L brightness gradation levels is includes, creating a ROM in an FPGA and storing a look-up table of screen display brightness value of LCD that is corresponding to the waveform occurrence N(T,A) at the current brightness gradation L. The ROM is divided into 2^a sub ROMs, each sub ROM has the capacity of 2^b×d bits. A value of round(p_L·N(T,A) is assigned to waveform brightness value D(T,A) and is stored correspondingly into the subROM_L of 2^b×d bits by ascending order of the b bits of binary data of waveform occurrence N(T,A). In this way, using the b bits of binary data of waveform occurrence N(T,A) as the binary address of the subROM_L, corresponding waveform brightness value D(T,A) at the current brightness gradation L can be obtained through look-up table in the subROM_L.