Phase Alternating Line
Phase Alternating Line
Phase Alternating Line (PAL) is a colour encoding system for analogue television broadcasts that uses a phase alternation of the colour subcarrier to encode colour information. PAL was developed in Germany and is used in most European countries, as well as in parts of Asia, Africa, and South America.
What does Phase Alternating Line mean?
A Phase Alternating Line (PAL) is a color television system developed in Germany in the early 1960s. It is a composite Analog video Signal that uses phase modulation to encode color information. PAL was adopted by many countries in Europe and other parts of the world, and it remains in use today in some areas.
The PAL system uses two color subcarriers, which are modulated with the color information. The subcarriers are 4.43 MHz and 3.58 MHz apart, and they are offset from the luminance carrier by 90 degrees. The color subcarriers are modulated with the color difference signals, which are the difference between the red and green signals, and the difference between the blue and green signals.
The PAL system is designed to reduce the effects of phase errors that can occur during transmission. These phase errors can cause the colors to be incorrect, but the PAL system uses a special phase correction circuit to compensate for them. This makes the PAL system more robust than other color television systems, such as NTSC.
Applications
PAL is used in a wide variety of applications, including:
- Television broadcasting
- Video recording
- Video games
- DVD and Blu-ray players
PAL is important in technology today because it is a high-quality color television system that is Compatible with a wide range of devices. It is also relatively easy to implement, which makes it a popular choice for manufacturers.
History
The PAL system was developed in Germany in the early 1960s by Walter Bruch. Bruch was working on a New color television system that would be more robust than the NTSC system, which was used in the United States. The PAL system was first demonstrated in 1963, and it was adopted by Germany in 1967.
The PAL system quickly became popular in Europe, and it was eventually adopted by many other countries around the world. Today, PAL is used in over 100 countries.
The PAL system has been updated several times over the years. The most recent update, PAL-M, was introduced in 1990. PAL-M is a digital television system that is compatible with PAL.
The PAL system is a testament to the ingenuity of Walter Bruch. It is a high-quality color television system that has been used for over 50 years. PAL is still in use today in many parts of the world, and it is likely to continue to be used for many years to come.