Facsimile detection system and method
    9.
    发明授权
    Facsimile detection system and method 失效
    传真机检测系统及方法

    公开(公告)号:US5519768A

    公开(公告)日:1996-05-21

    申请号:US347604

    申请日:1994-12-01

    摘要: In connection with enhanced telephone service, such as personal number service, the detection of whether an incoming telephone call is a facsimile transmission or an ordinary voice call is improved by a utilizing a modified ring back signal during the time in which the service circuit node of the telephone system is attempting to detect the presence of the calling tone (CNG signal) of the sending facsimile machine. Particularly, the ring back signal is modified to increase the off time of the ring back signal to be greater than the period of the CNG signal. Where the CNG signal is a periodic signal with a period of 4 seconds with a 0.5 on time and a 3.5 off time, the modified ring back signal has a period of 7 seconds with a 2 second on time and a 5 second off time.

    摘要翻译: 关于诸如个人号码业务的增强电话业务,通过在服务电路节点的时间期间利用修改的回铃信号来改进对传入电话呼叫是传真发送还是普通语音呼叫的检测 电话系统正在尝试检测发送传真机的呼叫音(CNG信号)的存在。 特别地,回铃信号被修改以将回铃信号的关闭时间增加到大于CNG信号的周期。 CNG信号为周期性信号,周期为4秒,时间为0.5,时间为3.5,修改后的回铃信号的时间为7秒,时间为2秒,关闭时间为5秒。