While TV signal is switched, SCM outputs volume adiusting code with refference to default volume in a certain period to realize closed loop control of TV accompanyind sound, afterwards back to open loop control.
While TV signal is switched, SCM outputs volume adiusting code with refference to default volume in a certain period to realize closed loop control of TV accompanyind sound, afterwards back to open loop control.
当信号切换操作时，在一定时间内以默认音量值为参照，由单片机发出电视接收机音量调节编码，实现电视伴音音量闭环调控，调控结束后恢复开环形式。