发明授权
- 专利标题: Transmitting circuit and receiving circuit
- 专利标题(中): 发射电路和接收电路
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申请号: US127276申请日: 1993-09-27
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公开(公告)号: US5365543A公开(公告)日: 1994-11-15
- 发明人: Kenichi Takahashi , Hiroshi Ohnishi , Minako Takeishi
- 申请人: Kenichi Takahashi , Hiroshi Ohnishi , Minako Takeishi
- 申请人地址: JPX
- 专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人地址: JPX
- 优先权: JPX3-324425 19911209; JPX4-257795 19920928
- 主分类号: H04J13/00
- IPC分类号: H04J13/00 ; H04B1/7073 ; H04K1/00
摘要:
In a first direct-sequence spread spectrum communication system having a transmission circuit where a data signal to be transmitted is coded by a first chip code signal and a receiving circuit for decoding the transmitted data signal with a second chip code signal, the synchronization between the said first and second chip code signals is performed when an asynchronous condition of said first and second chip code signals is detected over a predetermined interval. In a second direct-sequence spread spectrum communication system having a transmission circuit where a data signal having a variable data rate V to be transmitted is coded by a first chip signal having a data rate C and coded by a reference code signal having a data rate R, C>V, R>V. A receiving circuit receives the data signal from the above-mentioned transmission circuit decoded by a second chip signal and a second reference code signal. This receiving circuit has a lowpass filter and it is unnecessary to change the lowpass filter if the data rate V is lower than R. A third system combines these techniques.
公开/授权文献
- US4850612A Labels and manufacture thereof 公开/授权日:1989-07-25