Patent ID: 8648887

Claim:
A method for adjusting waveform brightness for a waveform formatted for display on a digital three-dimensional oscilloscope DTO M having brightness gradations M such that the waveform can be displayed on a digital three-dimensional oscilloscope DTO L having brightness gradations L, where a=└log 2 M┘+1, in which └log 2 M┘ is the largest integer not exceeding log 2 M, and wherein b bits of binary data correspond to waveform occurrences N(T,A) at the time of T and amplitude of A for DTO M , wherein brightness gradation L is 0≦L≦M−1 and p L is the proportion value of brightness gradation L, the method comprising: creating a read-only memory (ROM) in a field programmable gate array (FPGA) and storing in the ROM a look-up table correlating screen display brightness values of DTO M for the waveform occurrence N(T,A) to screen display brightness values of DTO L for waveform occurrences D(T,A), wherein a corresponding address of the ROM for each the waveform occurrences N(T,A) is c=a+b bits such that a bits is a binary number that represents the current brightness gradation L and serve as the higher a bits of the c bits address and b bits of binary data of waveform occurrence N(T,A) serve as the lower b bits of the c bits; dividing the ROM into 2 a sub ROMs, wherein each sub ROM has a predetermined the capacity of 2 b ×d bits; and wherein one of the sub ROMs corresponding to the current brightness gradation L is labeled as subROM L ; assigning integer values of round(p L ·N(T,A)) to waveform brightness values D(T,A) and storing the assigned integer values 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); obtaining corresponding waveform brightness value D(T,A) at the current brightness gradation L through look-up table in the subROM L using the b bits of binary data of the c bits address of waveform occurrence N(T,A) as the binary address of the subROM L , and displaying the waveform on DTO L , according to the corresponding waveform brightness value D(T,A).