公开(公告)号：US4749825A

公开(公告)日：1988-06-07

申请号：US32867

申请日：1987-03-31

申请人： Scott Stewart ,  Edwin W. Eloranta

发明人： Scott Stewart ,  Edwin W. Eloranta

IPC分类号： H04L21/04

CPC分类号： H04L21/04

摘要： A method and apparatus are provided for decoding both radio facsimile and radio teletype broadcast signals. A zero crossing detector detects zero crossings of the broadcast signal and generates a pulse with each zero crossing. A time interval is determined between the detected zero crossings. The determined time interval is compared with a plurality of predetermined threshold values for generating a first decoded signal. The first decoded signal is utilized for generating a print signal. The print signal is applied to a conventional printer for generating both the facsimile chart and teletype message.

摘要翻译： 提供了一种解码无线电传真和无线电传播广播信号的方法和装置。 零交叉检测器检测广播信号的过零点，并产生每个过零点的脉冲。 在检测到的过零点之间确定时间间隔。 将确定的时间间隔与用于生成第一解码信号的多个预定阈值进行比较。 第一解码信号用于产生打印信号。 打印信号被应用于传统打印机以产生传真图和电传信息。