| 摘要 |
An improved video conferencing system and method is disclosed for providing real-time audio/visual communications and data transfer between at least two device/system users over conventional POTS copper-wire based telephone lines, or T1/E1 telephone lines. The video conferencing system includes: a personal computer, a combination video and audio encoding and decoding circuit in electronic communication with the personal computer, a combination video display and audio input/output circuit in electronic communication with the personal computer, a sound sensing device, such as a microphone, in electronic communication with the input/output circuit, a digitizing circuit for transforming detected sound into a digital audio signal, a continuous display camera in electronic communication with said input/output circuit including an overlay feature for transforming detected visual images into a digital video signal, and a two way coder/decoder (CODEC) for combining the transformed digital audio and digital video signals into a high-speed digital audi/visual signals. Embodiments of the video conferencing system may also include a channel service unit (CSU) for converting said high-speed digital signals into a single T1/E1 signal for transmission over conventional POTS copper-wire based telephone lines via a high-bit-rate subscriber line (HDSL) connection. |
