The invention of TV telephone is based on the invention of telephone, so Bian Xiao will tell you the process of telephone invention first. 1873, Bell tried to send many messages at the same time with a telegraph line, so his idea was supported by his wife. His wife Mabel is deaf, so she can't hear. She is also a student of Bell, and her father is very rich, so when she heard that her son-in-law wanted to conduct a scientific experiment, she provided financial support. Many of Bell's friends want him to learn telegraph technology, but Bell doesn't think so. The one he wants to finish most.

He first connected two charged reeds with a wire, and each reed had a counterpart with the same frequency at the other end of the wire. Bell made Bell into a thin film to imitate the human ear. One day, when Beljean's assistant helped him with his experiment, he found that Bell could hear his assistant's voice, so he went on with his further experiment. During the experiment, Bell encountered many difficulties, but he always turned to many famous scientists for help, such as Edison. Later, Bell finally got through on the phone.

After the invention of telephone, there was the invention of videophone. Video phone is a kind of video phone, that is, it can transmit people's voices and images through telephone lines, and people can be seen when making a phone call. Videophone, also called videophone, can be used to make a phone call just like an ordinary phone, but it has its own camera function and can transmit the image of the caller to the other party. Television can receive images, which is equivalent to a display device.

The above story only represents my personal opinion. Please forgive me if there is any mistake.