Television communication system with time delay compensation
阅读：328发布：2022-10-28
专利汇可以提供Television communication system with time delay compensation专利检索，专利查询，专利分析的服务。并且A television station which receives remotely originated signals via relay satellite can time its local sync and burst signal generators with a standard reference frequency which it itself sends to the relay satellite and receives back from the relay satellite. This permits locally originated signals timed by the local sync and burst signal generators to be synchronized with the remotely originated signals to good approximation, despite time delay variations of the remotely originated signals caused by variations of the relay satellite orbit, permitting an adjustable delay line to then be used to compensate remnant delay variations. Consequently, cross fading or other special-effects mixing between locally and remotely originated programs is facilitated.，下面是Television communication system with time delay compensation专利的具体信息内容。
1. In a television station equipped to receive remotely originated programs via relay satellite and to selectively combine said programs with locally originated programs for network distribution, broadcasting, video tape recording and the like, said television station having first receiver apparatus to receive signals descriptive of remotely originated programs as retransmitted by said relay satellite after its reception of said remotely originated programs from a transmitter at the remote location, a source of standard frequency signal waves, a synchronizing signals generator capable of being locked to a signal wave, a camera chain providing signals being descriptive of locally originated programs and being timed in accordance with said synchronizing signals generator, and apparatus for alternatively selecting portions of said signals descriptive of remotely and locally originated programs as station output signals, apparatus to accommodate delay variations in said remotely originated programs caused by orbital variations of said relay satellite comprising: auxiliary transmitter apparatus to encode an applied signal upon a carrier wave for transmission to said relay satellite, means to provide a signal responsive to said standard frequency signal waves from said source to supply it to said transmitter apparatus to be encoded upon said carrier wave, auxiliary receiver apparatus to receive retransmitted signals from said relay satellite and to decode them from said carrier wave to recover said encoded signal, means to provide recovered standard frequency signal waves from said recovered encoded signal, and switching means to supply said recovered standard frequency signal waves to said synchronizing signals generator to provide locking therefrom when combining portions of said remotely and locally originated programs as said station output signals and to couple said standard frequency signal waves from its said source to said synchronizing signals generator to provide locking when only said locally originated programs are provided as said station output signals.
2. Delay variations accommodating apparatus as claimed in claim 1 wherein, first frequency translating means is included in said means to supply signal to said transmitter apparatus to be encoded and, second frequency translating means is included in said means to supply recovered standard frequency waves to said synchronizing signals generator.
3. Delay variations accommodating apparatus as claimed in claim 2 wherein said first and second frequency translating means include: means to provide a modulating frequency wave; first modulator means, to modulate said standard frequency signal waves by said modulating frequency to provide first sideband signals located in frequency subspectra respectively of lower frEquency than said standard frequency and of higher frequency than said standard frequency; first filter means to select said first sideband signals in one of said subspectra provided from said first modulator means and to supply said selected sideband signals to said auxiliary transmitter apparatus for encoding; second modulator means to modulate said recovered encoded signal by said modulating frequency to provide second sideband signals located in frequency subspectra respectively of lower frequency than said recovered encoded signal and of higher frequency than said recovered encoded signal; and second filter means, to select said second sideband signals in one of said subspectra provided from said second modulator means and thereby to provide said recovered standard frequency signal waves.
4. Delay variations accommodating apparatus as claimed in claim 1 wherein, frequency synthesizing apparatus is included in said means to supply signal to said transmitter apparatus to be encoded, supplying said signal to be encoded from a first of its output circuits and supplying from a second of its output circuits a signal having a frequency equal to the difference in frequency between said standard frequency and the frequency of said signal to be encoded, a modulator means modulates said recovered encoded signal by said signal supplied from said second frequency synthesizing apparatus output, a filter means suppresses frequency components other than said recovered standard frequency signal wave in signals provided from said modulator means to lock said synchronizing signals generator.
5. In a television station equipped to provide selected combinations of locally originated programs and remotely originated programs received thereat by earth orbiting relay satellite for network distribution, broadcasting, video tape recording and the like, and wherein each of said programs are individually timed by reference frequency signal waves of substantially comparable frequency, apparatus at the local location comprising: a source of said reference frequency signal waves; a synchronizing signal generator; a camera chain providing video signals representative of said locally originated programs, controllably timed in accordance with said synchronizing generator; means for receiving video signals representative of said remotely originated programs as relayed from said orbiting satellite and for providing said signals as an output thereof; adjustable mixing means having a first input terminal coupled to said camera chain to receive said locally generated video signals, a second input terminal coupled to said last-mentioned means to receive said remotely generated video signals, and an output terminal at which said selected combinations of programs are supplied; means coupled to said frequency signal source for transmitting said reference frequency wave to said relay satellite and for receiving a corresponding reply therefrom delayed in time as a function of the transmission path length between said satellite and said local location; and means for switching said synchronizing signal generator to lock to said source of reference frequency signal waves when said mixing means is activated to supply programs of local origination only, and for switching said synchronizing signal generator to lock to said reply reference frequency signal wave when said switching means is activated to supply programs of local and remote origination in combination; whereby in said latter switching condition, the video signals from the camera chain at said local location remain in substantial time synchronism with the video signals from said remote location as relayed by said satellite independent of the transmitting path length between two locations and of any changes therein.
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