发明授权
- 专利标题： Multi-frequency signal receiver
- 专利标题（中）： 多频信号接收机
-
申请号： US97697申请日： 1979-11-27
-
公开(公告)号： US4347408A公开(公告)日： 1982-08-31
- 发明人: Hiroko Ito , Eiji Ohira , Akira Ichikawa
- 申请人： Hiroko Ito , Eiji Ohira , Akira Ichikawa
- 申请人地址： JPX Tokyo JPX Tokyo
- 专利权人： Nippon Telegraph and Telephone Public Corporation,Hitachi, Ltd.
- 当前专利权人： Nippon Telegraph and Telephone Public Corporation,Hitachi, Ltd.
- 当前专利权人地址： JPX Tokyo JPX Tokyo
- 优先权： JPX53-149943 19781206
- 主分类号： H04Q1/45
- IPC分类号： H04Q1/45 ; H04L27/26 ; H04Q1/457 ; H04M1/50
摘要：
A multi-frequency signal receiver, in which the digital input signals having the sampling frequency of 8 KHz or a multiple thereof are resampled at a sampling frequency of 4 KHz by means of a resampling circuit and in which the signals thus resampled are subjected to the band selection by means of a digital filter so that the frequency of the input signals may be identified.
公开/授权文献
- USD422410S Case 公开/授权日：2000-04-11