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1. 发明授权

US4034405A Television facsimile transmission system 失效
标题翻译：电视传真传输系统
公开(公告)号：US4034405A
公开(公告)日：1977-07-05
申请号：US628098
申请日：1975-11-03
申请人： Peter Johannes Hubertus Janssen
发明人： Peter Johannes Hubertus Janssen
IPC分类号： H04B7/02 , H04L1/08 , H04N1/00 , H04N1/41 , H04N7/025 , H04N7/03 , H04N7/035 , H04N7/088 , H04N7/12 , H04N7/08
CPC分类号： H04L1/08 , H04N1/00098 , H04N7/088
摘要： Facsimile transmission can be effected in a conventional television system by means of code words which occur in a television line period in a field blanking interval. Transmission in the UHF band does not give rise to specific problems, but transmission in the VHF band does, in particular in that pulse disturbances occur. The influence of these disturbances can be eliminated by transmitting the same facsimile information during two (or more) successive line periods. The receiver is provided with a circuit which includes three delay devices, one having a delay time equal to a line period and the other two having delay times equal to at least the duration of a facsimile code word. The pulse disturbance is detected by means of a superposition stage and a signal detector, and the undisturbed code word is supplied via a change-over stage to a storage stage.
摘要翻译：可以通过在现场消隐间隔的电视线路周期中出现的码字在传统电视系统中实现传真传输。在UHF频带中的传输不会引起具体问题，但VHF频带中的传输特别是在发生脉冲干扰的情况下。这些扰动的影响可以通过在两个（或多个）连续行期间内传送相同的传真信息来消除。该接收机设置有一个包括三个延迟装置的电路，一个具有等于行周期的延迟时间，另外两个具有等于至少传真码字持续时间的延迟时间。通过叠加级和信号检测器检测脉冲干扰，通过转换级将未受干扰的码字提供给存储级。

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