公开(公告)号：US06272184B1

公开(公告)日：2001-08-07

申请号：US08992034

申请日：1997-12-17

申请人： Jonathan H. Ta ,  Samuel T. Wong ,  Stanley C. Hsieh ,  Sandeep Rajpal

发明人： Jonathan H. Ta ,  Samuel T. Wong ,  Stanley C. Hsieh ,  Sandeep Rajpal

IPC分类号： H03D300

CPC分类号： H04L27/156

摘要： A non-coherent frequency shift keying detection scheme. The invention has been applied to the special case of capturing caller ID information when the voice-band modem is in the low power mode. The technique provides the capability for capturing and decoding enough of the caller ID information transmitted by the telephone company while the computer is in the sleep or low power mode, and upon awakening the computer can use this captured information to decode the actual caller ID information. Additionally, this invention automatically accommodates both the Bell 202 or V.23 transmission standards by utilizing a threshold concept in which the time that has elapsed between the zero crossings of an FSK tone half cycle are measured. The elapsed times may be used as an indication of which FSK tone has been transmitted thus allowing capture of caller ID information. The bit output of the caller ID capture circuit is output for storage by RAM thus allowing use by the computer when it wakes up.

摘要翻译： 非相干频移键控检测方案。 本发明已经应用于当语音频带调制解调器处于低功率模式时捕获主叫用户ID信息的特殊情况。 该技术提供了在计算机处于睡眠或低功率模式时由电话公司发送的足够的主叫ID信息进行捕获和解码的能力，并且在唤醒计算机可以使用该捕获的信息来解码实际的呼叫者ID信息。 此外，本发明通过利用其中测量在FSK音调半周期的过零点之间已经经过的时间的阈值概念，自动适应Bell 202或V.23传输标准。 经过的时间可以被用作指示哪个FSK音已经被发送，从而允许捕获呼叫者ID信息。 主叫ID捕获电路的位输出被输出以供RAM存储，从而允许计算机在唤醒时使用。