Topic: How are words and pictures sent through telephone wires?
Words and pictures are not directly sent through telephone wires. Telephone wires, also known as landlines or telecommunication lines, are primarily designed for transmitting analogue or digital signals, which are then converted into voice data for telephone conversations. However, with the advancement of technology, data transmission methods have evolved, allowing the transmission of words and pictures over telephone lines in the form of digital data.
The digital data is encoded into binary code consisting of 0s and 1s for transmitting words, such as text messages or emails. This binary code represents characters and symbols based on specific encoding schemes, such as ASCII or Unicode. The digital signals carrying the binary data are modulated onto the telephone wires using various modulation techniques.
When it comes to transmitting pictures or images, the process becomes more complex. Images are typically converted into digital form by breaking them down into pixels and assigning numerical values to each pixel based on colour or grayscale information. These digital images are then compressed using algorithms like JPEG or PNG to reduce the file size and make transmission more efficient. The compressed image data is then transmitted as a series of binary digits over the telephone wires using data transmission protocols such as TCP/IP or HTTP.
In modern times, traditional landline telephony has been largely replaced by digital technologies such as cellular networks and the Internet. These technologies use different transmission methods, such as packet switching, to transmit words and pictures and various forms of multimedia data, including voice, video, and more.