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    • 6. 发明授权
    • Spread-spectrum data publishing system
    • 扩频数据发布系统
    • US6118824A
    • 2000-09-12
    • US63639
    • 1998-04-20
    • Douglas G. SmithRobert C. DixonJeffrey S. Vanderpool
    • Douglas G. SmithRobert C. DixonJeffrey S. Vanderpool
    • H04B7/26H04H20/31H04H20/42H04H20/74H04H60/07H04H60/90H04H60/91H04J13/00H04W4/06H04W4/18H04W48/10H04W48/12H04L12/18H04B1/38H04L27/00H04L29/06
    • H04W72/005H04B7/2637H04H20/42H04H60/07H04H60/90H04W4/06H04W48/12H04H20/31H04H20/74H04H60/91H04W4/18H04W48/10
    • A system for publishing data on shared broadcast channels using spread-spectrum techniques, which may comprise a spread-spectrum encoder capable of receiving data and placing it in a spread-spectrum signal format and a transmitter operating on a shared communication channel or frequency band, such as might be allocated to terrestrial point-to-point or broadcast communications. The shared communication channel may comprise a cellular system, in which data may be transmitted using spread-spectrum techniques using the transmitters and repeaters of the cellular system simultaneously with voice and other transmissions associated with the cellular system. A subscriber station may be capable of receiving using a plurality of different communication channels or frequency bands, such as a first receiver capable of cellular reception and a second receiver capable of satellite reception, at least one of which uses spread-spectrum techniques. The subscriber station may also comprise a transmitter using at least one communication channel or frequency band, so that the subscriber station may receive data or other transmissions using one channel and may request further data or other transmissions using a second channel.
    • 一种用于使用扩频技术发布共享广播信道上的数据的系统,其可以包括能够接收数据并将其放置在扩频信号格式中的扩频编码器和在共享通信信道或频带上操作的发射机, 例如可能被分配给地面点对点或广播通信。 共享通信信道可以包括蜂窝系统,其中可以使用与蜂窝系统相关联的语音和其他传输的蜂窝系统的发射机和中继器的扩频技术来发射数据。 订户站可以能够使用多个不同的通信信道或频带来接收,例如能够进行蜂窝接收的第一接收机和能够进行卫星接收的第二接收机,其中至少一个使用扩频技术。 订户站还可以包括使用至少一个通信信道或频带的发射机,使得用户台可以使用一个信道接收数据或其他传输,并且可以使用第二信道请求进一步的数据或其他传输。
    • 7. 发明授权
    • Two-way data broadcast networks
    • 双向数据广播网络
    • US4928177A
    • 1990-05-22
    • US179657
    • 1988-04-11
    • Louis Martinez
    • Louis Martinez
    • H04H20/72H04H20/79H04H60/90H04H60/97H04N7/00H04N7/08H04N7/173
    • H04N7/173H04H20/72H04H20/79H04H60/90H04H60/97H04N7/00H04N7/08
    • Forward link communication is achieved utilizing a conventional television broadcast station, either utilizing an entire presently unused TV channel or in a shared TV mode, with the return link communication being achieved using narrow band communication techniques for relatively low data rate communication through conventional television receiver aerials to a central receiver near the television station transmitter. The carrier reference of a local AM radio station is used as a synchronizing reference for the data streams and to allow the very close sepraration of each band in the return communication link to allow a large number of remote receivers to simultaneously communicate in the reverse link. Alternatively, the TV Chroma subcarrier serves this purpose.
    • 使用传统的电视广播站,利用整个当前未使用的TV频道或共享TV模式来实现前向链路通信,其中使用窄带通信技术来实现返回链路通信,用于通过常规电视接收机天线进行相对低的数据速率通信 到靠近电视台发射机的中央接收机。 本地AM无线电台的载波参考用作数据流的同步参考,并允许返回通信链路中的每个频带的非常接近的分隔,以允许大量远程接收机在反向链路中同时进行通信。 或者,TV Chroma副载波也是用于此目的的。
    • 8. 发明授权
    • Control of rf answer pulses in a TV answer back system
    • 在电视应答系统中控制rf应答脉冲
    • US4755871A
    • 1988-07-05
    • US934866
    • 1986-11-25
    • Fernando Morales-GarzaOscar Morales-GarzaJorge E. Ortiz-Salinas
    • Fernando Morales-GarzaOscar Morales-GarzaJorge E. Ortiz-Salinas
    • H04H1/00H04H20/72H04H60/33H04H60/90H04N7/16H04N7/173H04H9/00
    • H04N7/17309H04H20/72H04H60/33H04H60/90H04N2007/17372
    • In a TV answer back system where many receiver stations communicate with a TV transmitter station by means of rf pulses generated by rf oscillators at the receiver station, the requirement for keeping all oscillators on frequency is achieved without crystal temperature control by automatically controlling the rf oscillator frequency using synchronization signals carried in the video signal received from the TV studio. By this invention it has been possible to control the frequency of multiple megahertz oscillator as accurately as desired from relatively low frequency synchronizing signals such as the vertical and horizontal video sync pulses. Thus an oscillations counter is gated for a very accurate time period by the sync pulses, and the oscillation count is compared with a datum count representing the desired oscillation frequency. The requirement to prevent receiver stations from answering with rf pulses in response to queries contained in home video recordings of previously broadcast signals is achieved by encoding broadcast time on all query containing TV transmissions, and by comparing at receiver stations broadcast time information from received signal with time from a local battery backed clock contained at each receiver station, thus discrimination of video recordings is possible by comparing received video broadcast time with local time.
    • 在电视应答系统中,许多接收机站通过在接收站的rf振荡器产生的rf脉冲与电视发射台进行通信,通过自动控制射频振荡器来实现保持所有振荡器频率的要求,而不需要晶体温度控制 频率使用从电视演播室接收的视频信号中携带的同步信号。 通过本发明,可以从诸如垂直和水平视频同步脉冲的相对低频同步信号中精确地控制多兆赫兹振荡器的频率。 因此,振荡计数器通过同步脉冲选通非常精确的时间周期,并且将振荡计数与表示期望的振荡频率的数据计数进行比较。 通过在包含TV传输的所有查询上对广播时间进行编码,并且通过在接收站处对来自接收信号的广播时间信息进行比较来实现,以响应于先前广播信号的家庭视频记录中包含的查询来防止接收站应答rf脉冲的要求 从每个接收站处包含的本地电池支持的时钟的时间,因此通过将接收到的视频广播时间与当地时间进行比较来识别视频记录。