电视接收机信号切换中的音量智能均衡控制

Intelligent volume balance on TV signal switch

针对电视接收机信号切换时音量常常突兀变化的设计缺陷,在对其进行综合分析的基础上,提出一种新的控制方式.在单片机对电视机遥控操作编码进行识别的基础上,对默认音量的采样.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.当音量调节操作时,则在开环形式下完成默认音量的采样更新.通过上述两种方式,实现伴音音量的智能均衡控制.用一个单片机系统使这种控制思想得以验证.

Based on the analysis of the defect,a new control method is proposed to address the abrupt volume change on TV signal switch. The default volume is collected by SCM identifying TV telecontrol code. While TV signal is switched,SCM outputs volume adiusting code with refference to default volume in a certain period to re- alize closed loop control of TV accompanyind sound, afterwards back to open loop control. While volume adjusting is evoked,default volume is collected under the mode of open loop control. Thas,intelligent volume balance is achieved by the above two modes. A protefype of volume balance control using SCM proves the presented scheme is highly effective.