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现代电话应答机和无绳电话的特点在于用数字键盘来控制其所有的功能,其中包括扬声器和耳机的音量,振铃音量和应答响应时间。但至今为止恐怕连设计人员也只能通过在常规电话IC周围加装若干电路,才得以提供这类功能。 Philips Semiconductors(飞利浦)最近推出的UBA1707电话线路IC接口已大大简化了这一设计难题。它不但把无绳电话基地台和电话应答机的模拟,功能置于全数字式控制之下,
Modern telephone answering machines and cordless phones feature a numeric keypad to control all their functions, including speaker and headset volume, ring volume, and response response time. But so far I’m afraid designers will only be able to provide this kind of functionality by adding a few circuits around the regular phone ICs. Philips Semiconductors (Philips) recently introduced UBA1707 telephone line IC interface has been greatly simplified this design problem. It not only put the simulation and function of cordless phone base stations and answering machines into full digital control,