The analog-to-digital converter (ADC) is positioned between the TV
camera tube or CCD and the computer.
Before the advent of digital image sensing devices, analog image sensors used to function with the video
camera tubes. These tubes are replaced by digital technologies such as CCD and CMOS image sensors.
Narragansett Technologies and its two divisions, Narragansett Imaging and Narragansett EMS, originally made a name for itself in the digital imaging market as a division of the Philips Components group, designing and manufacturing medical
camera tubes and digital imaging modules.
The history incorporates technology such as vacuum and sensitive
camera tubes, field-sequential and compatible color, color picture tubes, projectors, transmission, delayed broadcasting, and digital television.
Before the digital era, analog image sensors functioned with video
camera tubes, which are now replaced by digital technologies such as charge-coupled device (CCD) and complementary metal-oxide-semiconductor (CMOS) image sensors.