A videophone is a Telephone with a video display, capable of simultaneous video and audio for communication between people in real-time. Videophone service provided the first form of video telephony, later to be followed by videoconferencing, webcams, and finally high- definition tele presence. At the dawn of its commercial deployment from the 1950s through the 1990s, video telephony also included ‘image phones’ which would exchange still images between units every few seconds over conventional POTS-type telephone lines, essentially the same as slow scan TV systems. The development of advanced technology video codec’s and high bandwidth Internet telecommunication services allowed videophones to provide high quality
color service between users almost anyplace in the world that the Internet is available, often at low or nominal costs. In the present day videophones have become widely available at reasonable cost, although not widely used in everyday communications for a variety of reasons. However they are particularly useful to the deaf and speech-impaired who can use them with sign language and are becoming increasingly popular for educational instruction, telemedicine and to those with mobility issues.
Audio Video Door Phones