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多功能是电话机的发展方向,但功能多会增加电话机的成本,而电话机的有些功能家庭用户很少使用。因此,消费者在购买电话机时,应根据需要选择功能。1.免提和扬声功能。具有免提功能的电话机可以免提呼叫、通话,由于送话与受话之间容易出现声反馈、电反馈和机械反馈,因此对电路技术及工艺质量要求较高,但其功能好坏可以通过试打判断。具有扬声功能的电话机不能免提送话,只能免提拨号,受话与送话之间的反馈不明显,对电路要求
Multi-function is the development direction of the telephone, but the function will often increase the cost of the telephone, and some functions of the telephone are rarely used by home users. Therefore, when consumers buy telephone sets, they should select functions according to their needs. 1. Hands-free and speaker functions. Hands-free phone can be hands-free calls, calls, as between the sending and receiving prone to acoustic feedback, electrical feedback and mechanical feedback, so the circuit technology and process quality requirements, but its function can be good or bad Judge by trial and error. Speaker with speaker function can not be hands-free, only hands-free dialing, receiving and sending feedback between the obvious, the circuit requirements