Which device converts binary numbers from memory into analog voltages for CRT display, determining brightness of the echoes?

Which device converts binary numbers from memory into analog voltages for CRT display, determining brightness of the echoes?

• A. Digital to Analog Converter
• B. Analog to Digital Converter
• C. Digital Memory
• D. Scan Converter

Answer: (A)

Brightness on a CRT is set by the analog video signal that drives the electron beam. Echo amplitudes are stored as digital values in memory, and the device that translates those digital codes into a corresponding voltage is the digital-to-analog converter. The DAC takes the binary value and outputs a precise voltage that modulates the display brightness for each echo, creating the grayscale image. An analog-to-digital converter would perform the opposite operation, turning an analog signal into digital data. Digital memory stores the numbers but does not convert them to voltages. A scan converter helps map image data for display timing and format, but the actual brightness comes from the DAC.

Brightness on a CRT is set by the analog video signal that drives the electron beam. Echo amplitudes are stored as digital values in memory, and the device that translates those digital codes into a corresponding voltage is the digital-to-analog converter. The DAC takes the binary value and outputs a precise voltage that modulates the display brightness for each echo, creating the grayscale image.

An analog-to-digital converter would perform the opposite operation, turning an analog signal into digital data. Digital memory stores the numbers but does not convert them to voltages. A scan converter helps map image data for display timing and format, but the actual brightness comes from the DAC.