PAL Colour Encoder (TEA2000-V1)

A PAL color encoder and video summer which requires just composite sync and composite blanking inputs, and a 6-bit binary coded input giving the color information. The inputs are organized as 2 bits per primary color with gamma correction automatically applied to the resultant luminance and chrominance levels. More: Each of the equally spaced intensity levels for each primary color is combined with those of the other primary colors. This produces 64 output colors comprising a wide range of saturated and desaturated colors, black, white and two levels of grey. The out

The described circuit functions as a PAL (Phase Alternating Line) color encoder and video summer, which is crucial for generating color video signals compliant with the PAL standard. The encoder accepts composite sync and composite blanking signals, which are essential for synchronizing the video signal with the display device, ensuring that the image is rendered correctly on the screen.

The core of the color encoding process relies on a 6-bit binary coded input that conveys color information. This input is structured into two bits for each of the three primary colors: red, green, and blue (RGB). This binary representation allows for 64 distinct combinations of colors, as each primary color can be represented by four intensity levels (00 to 11 in binary).

The circuit incorporates automatic gamma correction, which adjusts the luminance and chrominance levels to compensate for the non-linear response of display devices. This ensures that the output colors are rendered accurately, maintaining the intended brightness and saturation levels.

The output of the encoder is a composite video signal that combines the intensity levels of the primary colors. Each of the 64 output colors includes a range of saturated and desaturated colors, as well as neutral colors such as black, white, and two shades of grey. The ability to produce a wide array of colors makes this encoder suitable for various applications in video processing and broadcasting.

In summary, the PAL color encoder and video summer is a sophisticated circuit that effectively manages color information and synchronization signals to produce a coherent and visually appealing video output. Its design allows for flexibility in color representation while ensuring compatibility with PAL standards.A PAL color encoder and video summer which requires just composite sync and composite blanking inputs, and a 6-bit binary coded input giving the color information. The inputs are organized as 2 bits per primary color with gamma correction automatically applied to the resultant luminance and chrominance levels.

Each of the equally spaced intensity levels for each primary color is combined with those of the other primary colors. This produces 64 output colors comprising a wide range of saturated and desaturated colors, black, white and two levels of grey.

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