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Ghost-cancelling-reference-signal-transmission-reception-system

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Ghost cancelling reference signal transmission/reception system

Details

Inventors: Kobo, Kazuo; Fukui, Kiyotake; Nozoe, Toshiro; Morotomi, Noriaki;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Groody; James J.
Assistant Examiner: Harvey; David E.
Attorney, Agent or Firm: Wenderoth, Lind & Ponack

A ghost cancelling reference signal transmission/reception system, which allows a built-in ghost cancelling device to eliminate group-delay distortion, frequency-amplitude characteristic distortion, ghost components generated in a signal transmission path. A digital signal is superposed on a television signal in a vertical blanking period of the television signal as a ghost cancelling reference signal.

DETAILED DESCRIPTION An object of the present invention is to eliminate group-delay distortion, frequency-amplitude characteristic distortion, ghost and the like from the television signal transmission system and at the same time allow the system to securely transmit digital data signal.
In order to achieve this object, the present invention provides a ghost cancelling reference signal transmission/reception system comprising: means for generating a digital signal; means for superposing the digital signal on a television signal in a vertical blanking interval; means for transmitting the television signal containing the superposed digital signal; and ghost-cancelling means for cancelling group-delay distortion, frequency-amplitude characteristic distortion, ghost and the like generated in the television signal transmission means from the television signal transmitted through the transmission means.
The digital signal is a train of pulses which preferably has a randomness.
The present invention will be better understood from the detailed description given hereinbelow with the accompanying drawings in which:

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