accompanying sound channel的用法和样例：
- This paper describes the basic principle and main performance of the SWFM-IM(square wave frequency modulation-intensity modulation) optical fiber transmission system with two accompanying sound channels for colour TV programs.
- The same happens when selectively listening to the two different accompanying sound layers.
- The sound channel select mode and the volume control with intelligentized.
- Do not support many sound rail, only support one pair of sound channels of monotony rail.
- The telecast solution of forward stroke teletext accompanying sound