A capacitive interface may be utilized to provide a linear output from the TIP and RING phone lines to ringer circuitry. Because the interface provides a linear signal, the input provided to the ringer circuitry may also be utilized for other functions in addition to ringer detection functions. More...http://www.google.fr/patents/US6298133?utm_source=gb-gplus-shareBrevet US6298133 - Telephone line interface architecture using ringer inputs for caller ID data
Telephone line interface architecture using ringer inputs for caller ID data
