摘要:
A distributed block frequency converter that combines multiple channel signals into a combined radio frequency (RF) signal suitable for transport via selected media. The converter includes combiners that each combine at least two channel signals into a combined channel signal, an up-converter synthesizer that generates an up-converter local oscillator (LO) signal, up-converter mixers that each mix a combined channel signal with the up-converter LO signal to provide a corresponding intermediate frequency (IF) signal, bandpass filters that each filter an IF signal, down-converter synthesizers, down-converter mixers that each mix a down-converter LO signal with a corresponding filtered signal to provide a corresponding RF signal, and an RF combiner that combines the RF signals into a single RF signal. The down-converter synthesizers are adjustable to achieve frequency agility on a block by block basis.
摘要:
A transmission system omits blanking signals from vertical and horizontal synchronizing signals for video data while securing synchronized transmission between a transmission side and a reception side. To achieve this, the transmission system transmits first synchronizing data (HV) for identifying vertical synchronization, second synchronizing data (HDp) for identifying and synchronizing an effective video line, pixel data for the effective video line, a required digital audio signal, and auxiliary control data. The transmission system can reduce a transmission capacity, optimize a transmission format for optical wireless transmission, and decrease a transmission speed.
摘要:
An autostereoscopic image apparatus for picking-up an autostereoscopic image and optically transmitting and displaying the autostereoscopic image. The autostereoscopic image apparatus is constructed by an assembly of a plurality of optical fibers each having an equal length and a lens function. The length of each of a plurality of optical fibers is equal to a length that is integer times as long as one period of an optical path in the optical fiber. The first edge surface of each of a plurality of optical fibers is located on the same plane and forms the first edge surface of the optical fiber assembly. The second edge surface of each of a plurality of optical fibers is located on the same plane and forms the second edge surface of the optical fiber assembly. An arrangement at the first edge surface of the optical fiber assembly at the edge surfaces of a plurality of optical fibers and an arrangement at the second edge surface are equal. An object is picked-up on the first edge surface side of the optical fiber assembly. The picked-up image is transmitted to the second edge surface of the optical fiber assembly and is displayed on the second edge surface side of the optical fiber assembly.
摘要:
An interactive television information system coupled to a cable television system having a headend for supplying information services and an information service distribution network for delivering information services to subscriber televisions. Each subscriber television is associated with a home interface controller. The home interface controllers receive the television information signals and include a data transceiver for data communications. A subscriber selection device associated with a home interface controller permits subscriber interaction through the data transceiver with an assigned interactive controller from a plurality of interactive controllers. The assigned interactive controller is in communication with the information sources and in television communication with its assigned home interface controller. Selection of an information source nay be made through channel selection of an apparent channel from any of a first group of apparent channels and a second group of apparent channels. Different information services on different apparent channels from the first group of apparent channels are provided to a given home interface controller via the same television information signal as the subscriber changes channel selection from one of the apparent channels in the first group of apparent channels to another apparent channel in the first group of apparent channels. To receive apparent channels from the second group of apparent channels, a home interface controller simply selects the television information signal at its input corresponding to the selected channel.
摘要:
A telephone and video telecommunications distribution network (10) includes a telecommunications switch (12) and an optical network unit configuration (20b). The telecommunications switch (12) receives telephony traffic at a common control section (14) and video information at a video bank section (18). The video bank section receives telephony traffic from the common control section (14) and places the telephony traffic into telephony ATM cells. Video information is carried in video ATM cells. The Video Dank section (18) multiplexes telephony ATM cells and video ATM cells onto a fiber optic communication link for transport to the optical network unit configuration (20b). The optical network unit configuration (20b) includes a full service optical line unit (80) that segregates telephony ATM cells from video ATM cells. The full service optical line unit (80) transfers video ATM cells to a video brick (31) for processing. The full service optical line unit extracts telephony traffic from the telephony ATM cells for transport to a conventional optical network unit (82).
摘要翻译:电话和视频电信分配网络(10)包括电信交换机(12)和光网络单元配置(20b)。 电信交换机(12)在公共控制部分(14)处接收电话业务,并在视频组部分(18)处接收视频信息。 视频库部分从公共控制部分(14)接收电话业务,并将电话业务放置到电话ATM信元中。 视频信息在视频ATM信元中携带。 Video Dank部分(18)将电话ATM信元和视频ATM信元复用到光纤通信链路上,以传输到光网络单元配置(20b)。 光网络单元配置(20b)包括从视频ATM信元分离电话ATM信元的全业务光线路单元(80)。 全业务光线路单元(80)将视频ATM信元传送到视频块(31)进行处理。 全业务光线路单元从电话ATM信元提取电话业务以传输到常规光网络单元(82)。
摘要:
The subscriber terminal ms sends the demand including at least information for identifying the demand subscriber terminal, information for identifying the requested information, and information relating to the urgency of the requested information to the information distribution transmission center HE through an going-up line. The information distribution transmission center HE plans a transmission schedule of the information to be transmitted based on the demand from the subscriber terminal ms, and transmits the transmission schedule information included in the down-going control data to the subscriber terminal which sent the demand prior to the actual transmission, and transmits the requested information according to the above-mentioned transmission schedule. The subscriber terminal ms receives and analyzes the down-going control data from the information distribution transmission center HE and is informed of the transmission schedule, and acquires the information to be transmitted based on the obtained transmission plan, stores the acquired information in a large scale memory, and reads the information from the memory means for use. A video on-demand system can be realized without introducing a large scale system such as video server and with a relatively small investment, and the centralization of traffic is mitigated, and the network resource is used efficiently.
摘要:
A wideband signal distribution system for distributing among a plurality of outlets wideband signals modulated onto RF carrier signals within a specified frequency band. The system functions as "passive" infrastructure and includes a distribution unit having a plurality of input ports, a plurality of output ports, a transmission path, a combiner for applying signals appearing at the plurality of input ports to the transmission path, and a splitter for applying signals appearing on the transmission path to all of the plurality of output ports. The system further includes a plurality of cables selected from the class of fiber optic cables, coaxial cables, and twisted pair wire cables, each extending between a respective one of the distribution unit ports and a respective one of the plurality of outlets, and a plurality of impedance matching devices, where such devices are appropriate for the type or types of cable used. Each of the devices terminates a respective end of a respective one of the cables. Distribution units can be cascaded utilizing combinations of cable, such as coaxial cable or optical fiber cable, to enhance functionality of the system.
摘要:
A Wavelength-Division-Multiplexed (WDM) network provides delivery of both switched services and broadcast analog video over optical facilities through an intermediate optical apparatus (e.g., Passive Optical Network (PON)) splitter to a plurality of remote optical apparatuses (e.g., optical-network units (ONUs)). The broadcast signal is provided to only a selected ONU, together with the switched service signal for that selected ONU, the selected ONU then distributes the broadcast signal to other ONUs over a separate distribution facility interconnecting the ONUs.
摘要:
In optically transmitting a video signal comprised of luminance and chrominance signals which are frequency modulated to provide an FM luminance signal and an FM chrominance signal in respective adjacent frequency bands, such as, 6 to 20 MHz and 20 to 30 MHz, respectively, whereupon, infrared signals corresponding to the FM luminance and chrominance signals are output by respective emitting diodes, a carrier frequency for the FM chrominance signal is set, for example, between 25.93 and 26.08 MHz, so that the lower sideband wave of the FM chrominance signal is spaced by a substantial frequency from a frequency band in which a secondary distortion of the FM luminance signal is substantially generated. Further, the upper sideband wave of the FM chrominance signal is removed, as in a trap circuit, for ensuring that the transmitted FM chrominance signal will be accommodated in the respective frequency band therefor when its carrier frequency is set, as above. When the infrared signals corresponding to the FM luminance and chrominance signals are received by a photodiode and thereby transduced to respective FM modulated components output by the photodiode and then preamplified in common prior to separation, the component corresponding to the FM chrominance signal has the removed upper sideband wave restored by amplitude limiting thereof.
摘要:
A network architecture for delivery of broadcast and interactive digital services over a hybrid fiber-coax distribution system. The network includes at least one remote/local hub that communicates with a plurality of video information providers (VIPs) and a plurality of headends/central offices. Each headend communicates with a plurality of settop terminals. The hub includes a backbone subnetwork which provides the physical medium for components within the hub to communicate with each other, and for entities located outside the hub, such as the VIPs and the headends, to communicate with, and through, the hub. The hub processes broadcast digital information services from a VIP and distributes the services directly to the plurality settop terminals. The network architecture permits two-way transparent data transport service between the VIPs and the video information users. Through frequency division multiplexing, the network architecture facilitates analog signal distribution so both analog and digital services can be distributed.