| 摘要 |
Individual sound signals consecutively transmitted by PCM are divided in a main and auxiliary channel signals. A sound signal is transmitted by the main channel signal by two codings carried out in a time interval equal to a t.v. signal line period, while only one coding carried out in the same period is transmitted by the auxiliary channel signal. A code permitting at the receiving side automatic switching over to the main channel signal is transmitted through auxiliary channels over which no active sound signals are at a given time transmitted. |
