公开(公告)号：US3982188A

公开(公告)日：1976-09-21

申请号：US523862

申请日：1974-11-14

Applicant: Mitsuo Matsuzawa ,  Kaoru Mitarai

Inventor： Mitsuo Matsuzawa ,  Kaoru Mitarai

IPC: H03J7/28 ,  H03J7/18 ,  H04B17/00 ,  H04B17/318 ,  H04B1/32

CPC classification number: H03J7/18

Abstract: A multi-channel communication system including automatic station selecting circuitry and circuitry for preventing actuation of the station selection circuitry by noise or the like. The station selecting circuitry automatically, sequentially generates a plurality of local oscillator signals which are mixed with incoming information signals transmitted in one or more of the channels of the system. Whenever the frequency difference between an information signal and a local oscillator signal falls within the pass band of the receiving channel, a sensing signal is generated which stops the automatic station selector so that communications can occur on the selected channel. Circuitry is also employed to discriminate between noise and an appropriate information signal in the receiving channel so that the above-mentioned sensing signals are generated only when information signals are present.

Abstract translation: 一种多通道通信系统，包括自动站选择电路和用于通过噪声等阻止站选择电路致动的电路。 站选择电路自动地顺序地产生多个本地振荡器信号，其与在系统的一个或多个信道中发送的输入信息信号混合。 每当信息信号和本地振荡器信号之间的频率差落入接收信道的通带内时，产生一个感测信号，停止自动站选择器，以便可以在所选择的信道上进行通信。 电路还用于在接收信道中区分噪声和适当的信息信号，使得仅在存在信息信号时才产生上述感测信号。