| 摘要 |
A camera at a first site such as a remote interview studio (4) sends television signals via a mixer (6) to a broadcast transmitter (8). A camera (5) at a second location such as a central television studio (2) also sends television signals to the mixer (6). The signals are coded (at 29 and 7) using digital compression techniques which however cause significant delay an render unsatisfactory the conventional technique of using off-air signals from the transmitter (8) to provide a display at the remote studio of an interviewer (1) at the central studio, and of using the signals from the coder (29) to provide a display at the central studio of an interviewer (3) at the remote studio (4). Therefore each site (4, 2) has a further coder and decoder (24, 23) connected by a link (22) to the further coder and decoder (23, 24) of the other site and connected respectively to receive the output of the site's camera (10, 5) and to feed a decoded output to the site's monitor (26, 13). These coders use a coding scheme of lower picture quality and lower delay. |
