S-VIDEO (Y/C)
An S-video (also known as Y/C) signal refers to a video signal format that separates the luminance (brightness) and chrominance (color) components of a video signal for improved image quality.
The S-video signal uses a round, multi-pin connector that carries two separate signals: the luminance (Y) signal and the chrominance (C) signal. This differs from composite video, which combines both components into a single signal.
In CRT displays, the S-video signal is typically generated by a video source, such as a DVD player or gaming console, and transmitted to the CRT monitor or television. The S-video cable has a four-pin mini-DIN connector that ensures the separate transmission of the luminance and chrominance signals.
Upon receiving the S-video signal, the CRT display processes and decodes the luminance and chrominance signals separately. This separation allows for improved image quality, as it reduces color bleeding and provides sharper details compared to composite video signals.
Inside the CRT monitor, the electron beam scans across the phosphor-coated screen, illuminating the pixels based on the received S-video signal. The separated luminance and chrominance signals control the intensity and color of the electron beam, resulting in a more accurate and vibrant image representation.
S-video signals were commonly used in CRT technology, providing a better alternative to composite video connections for achieving higher picture quality.