Ep0856994a2




A particular person skilled within the art will derive many methods from rationalization above and the three examples mentioned beneath. Figures 6b and 6c are schematics of the parts of alternative embodiments for a digital cable headend. DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic of an current analog cable television delivery system. It is an object of this invention to provide a cable headend that decrypts signals obtained in numerous encryption codecs and encrypts all indicators transmitted to viewer properties into one encryption format. A number of analytical and statistical strategies may be used to determine the priority of the FIFOs 156 for sequencing. These commands will include which video alerts ought to be selected and different data such as the forms of indicators , whether the video is encrypted and the encryption methodology used, and so forth.

Depending on the particular embodiment, the television program signal could have to be compressed, combined/multiplexed, encoded, mapped, modulated, upconverted and amplified. Each transponder is just able to handling a single analog television program at a time. The acquired analog television program indicators are combined by the cable headend 34 and routed to the concatenated cable system 32. The one program per transponder limitation of the analog tv delivery system can be eradicated with the introduction of digital technology. In the preferred embodiment, two-way communications between the network controller 304 and set top terminal fifty eight will happen over cable strains. Interactive tv programming can be accommodated by way of the community controller 304.

Although uplink https://foxz89.com/tag/เว็บ-123 sites and satellite dishes can transmit and receive a number of video/audio program indicators, presently, each satellite transponder normally carries just one video/audio program at any given time. Further, there is typically one Integrated Receiver and Decoder per transponder at the analog cable headend to receive the sign from the transponder. DIGITAL VERSION - WITH COMBINER Figure 5a exhibits the essential parts of a cable headend 42 with a Combiner https://foxz89.com/tag/เว็บสล็อต-pg-เว็บตรง 104 that solely handles digital television programming signals 103.

Since the video sign's MPEG packets are addressed, each FIFO 156 is assigned to obtain certain video packets in MPEG format that have the suitable address assigned to that FIFO 156. This embodiment also offers for distant control of the Control CPU ninety by modem 116. Many compression strategies similar to MPEG can be found and can be used with the present invention. What is needed is a cable headend that can handle any essential signal encryption or decryption. Figure 10c shows a easy instance of how the overflow https://foxz89.com/tag/สล็อต-777-ฟรี-เครดิต condition could additionally be dealt with with software program at the Control CPU 90. This subroutine 224 must decide which packets of video/audio info are to be deleted and how many packets are to be deleted.

Each vendor uses scrambling techniques which are incompatible with the every other vendor. There are two primary cable trade leaders in scrambling formats, Scientific-Atlanta, Inc. , 4386 Park Drive, Norcross, GA and General Instrument Corporation, Gerald Communications Division , 2200 Byberry Road, Hatboro, PA 19040. The Control CPU ninety of figure 6a could also be instructed by a remote website (e.g., a national site) via a modem 116 or similar connection. Alternatively, as a substitute of enabling the outputs of the demultiplexers a hundred and twenty, the inputs of the Combiner 104 could additionally be chosen by the Control CPU 90. By enabling or choosing multiplexer outputs, the Control CPU ninety is ready to control which television programs are mixed and transmitted to the viewers.

In the preferred embodiment, where value and maintaining a precise program schedule is essential, the FIFOs 156 usually are not large sufficient to handle all overflows. The measurement of the FIFOs 156 is dictated by a https://foxz89.com/tag/สล็อตฝากถอนไม่มีขั้นต่-2 series of things such as price, acceptable loss of knowledge, scheduling and timing concerns. These factors must be balanced to discover out the dimensions of the FIFOs 156 wanted for any specific embodiment. Although the decryption/encryption equipment 126 is proven located after the demultiplexers 120 and between the error correction 124 and the Combiner 104, it might be located elsewhere.

What is needed is a cable headend that can mix varied digital video/audio signals to create tiered program choices for viewers. What is needed is a cable headend which receives a number of video/audio program alerts from a single satellite transponder. In addition, at present's cable tv delivery methods carry indicators which are scrambled for safety reasons.

Using the data sign from the transponders fifty two and the native avail info eighty four, the Control CPU 90 shown generates a digital knowledge sign called the set high terminal control information stream . The set high terminal management information stream is modulated and also despatched to the set high terminals fifty eight. A number of info to assist the set top terminal fifty eight could also be sent on this control data stream . For methods with set top terminals that are unable to use the STTCIS, this knowledge sign is unnecessary.

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signal processing system 300, the network controller 304 receives the program management info signal which incorporates cable franchise specific https://foxz89.com/tag/สมัครเว็บตรง data added by the Operations Center 56. The community controller 304 modifies the program control information sign, if essential, and communicates the new data to the signal processing system 300. The signal processing system 300 then forwards the data to the set prime terminal 58 within the form of the STTCIS. In most instances the network controller 304 will modify the program control data signal by adding additional information.

If the central site has requested a mixture that's beyond the capability of the Combiner 104 gear situated at that cable headend forty two, a notification signal will be sent to the central site requesting new info. The combination of video feeds could additionally be inappropriate for a wide range of causes, including too many video feeds or too many video packets to mix . Although just one verification check is shown for the data acquired from the central web site, these skilled in the artwork will notice that many verification checks on the information from the central website may be carried out. Following verification, notification or reject indicators could additionally be despatched to the central website. COMBINER SYSTEM HARDWARE Figure 7 exhibits a extra detailed view of 1 embodiment of a cable headend forty two with Combiner 104. Specifically, Figure 7 depicts the Combiner's 104 main components one hundred forty, which embrace elements that present a deciding on perform and other elements 142 that carry out sign combining.

In specific, figure 3b shows a modular answer to the issue of sending completely different alerts down different concatenated cable methods. Figure 12 is a schematic for one embodiment of a digital cable headend for the complicated program delivery system shown in figure 11. Figure 3b is a schematic of a modular digital cable headend system servicing two concatenated cable methods.

In this way, a single digital program may be selected from a transponder 52 carrying multiple digital applications. Priority two tv programming is not accepted by the cable television system whose digital capability is the smallest, or in this case, the forty eight mHz system 60. Priority two television programming is accepted and utilized by the two bigger capacity cable television methods proven sixty two, 64 respectively.

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