专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US3969678A Band pass filter circuit with automatic bandwidth adjust 失效
标题翻译：带通滤波电路，带宽自动调整
公开(公告)号：US3969678A
公开(公告)日：1976-07-13
申请号：US593126
申请日：1975-07-03
申请人： Masaru Asahara , Noriyasu Toyonaga , Hiroaki Ohyama , Hiroshi Nakamura , Ryushiro Yoshizawa
发明人： Masaru Asahara , Noriyasu Toyonaga , Hiroaki Ohyama , Hiroshi Nakamura , Ryushiro Yoshizawa
IPC分类号： G11B20/10 , H03H7/01 , H03L7/02 , H03L7/107 , H04J3/00 , H04L27/227 , H03G5/22
CPC分类号： H03L7/107 , H03L7/02
摘要： Band pass filter circuit for a band pass filter which detects a phase difference between input and output signals of said band pass filter, and the detected output controls, via a low pass filter, a voltage controlled oscillator, the output of which controls first and second mixers connected respectively to an input side and an output side of the band pass filter, so that the output of the first mixer can be maintained at the center frequency of said band pass filter. Further, when an irregularly timed signal is received, before an input signal is pulled in the synchronized state, said band pass filter is provided with a wide pass band so as to pull the signal in the synchronized state in rapidly. After said input signal is pulled in said center frequency, the pass band of said band pass filter is changed to a narrow bandwidth so as to improve the quality of the noise and at the same time, a cutoff frequency of said low pass filter is changed to a lower frequency side so as to improve the stability of the band pass filter circuit.
摘要翻译：用于带通滤波器的带通滤波器电路，其检测所述带通滤波器的输入和输出信号之间的相位差，并且所检测的输出通过低通滤波器控制其输出控制第一和第二混频器分别连接到带通滤波器的输入侧和输出侧，使得第一混频器的输出可以保持在所述带通滤波器的中心频率。此外，当接收到不正常定时的信号时，在输入信号被拉入同步状态之前，所述带通滤波器被提供有宽通带，以便迅速地拉动处于同步状态的信号。在所述输入信号被拉到所述中心频率之后，所述带通滤波器的通带被改变成窄带宽，以提高噪声的质量，同时改变所述低通滤波器的截止频率到低频侧，以提高带通滤波器电路的稳定性。

2. 发明授权

US4597079A Redundant switchover system for TDMA satellite communication equipment 失效
标题翻译： TDMA卫星通信设备冗余切换系统
公开(公告)号：US4597079A
公开(公告)日：1986-06-24
申请号：US589944
申请日：1984-03-15
申请人： Shinichiro Aoki , Ryushiro Yoshizawa
发明人： Shinichiro Aoki , Ryushiro Yoshizawa
IPC分类号： H04L1/22 , H04B1/74 , H04B7/15 , H04B7/212 , H04J3/14 , H04J3/16
CPC分类号： H04B1/74 , H04B7/212
摘要： In a redundant switchover system for a TDMA satellite communication system for relaying messages from earth station to earth station (A, B, C) via a communication satellite (SAT), an initially active terminal unit (1) for determines at an early stage that the transmit burst synchronization is lost, and an initially stand-by terminal unit (2) determines at a later stage that the transmit burst synchronization is lost. Thus, a fault in only the transmit portion of a first unit, which is undetected by other means, is detected by the first terminal unit, but not the second terminal unit. The second terminal unit does not determine loss of transmit burst synchronization until after the second transmit portion has been in operation for a sufficient period of time to establish whether it is operating properly.
摘要翻译：在用于经由通信卫星（SAT）将来自地球站到地球站（A，B，C）的消息中继的TDMA卫星通信系统的冗余切换系统中，初始活动终端单元（1）用于早期确定发送突发同步丢失，并且最初的备用终端单元（2）在稍后阶段确定发送突发同步丢失。因此，第一单元的不被其他装置检测到的仅发送部分的故障由第一终端单元而不是第二终端单元检测。第二终端单元在第二发送部分已经运行足够的时间段之后才确定发送突发同步的丢失，以确定其是否正常工作。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式