WO1993005613A2 - Improvements in satellite receiving equipment - Google Patents
Improvements in satellite receiving equipment Download PDFInfo
- Publication number
- WO1993005613A2 WO1993005613A2 PCT/GB1992/001633 GB9201633W WO9305613A2 WO 1993005613 A2 WO1993005613 A2 WO 1993005613A2 GB 9201633 W GB9201633 W GB 9201633W WO 9305613 A2 WO9305613 A2 WO 9305613A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- noise
- satellite
- picture signal
- signals
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
- H04N5/213—Circuitry for suppressing or minimising impulsive noise
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
Definitions
- This invention relates to improvements in satellite transmission and receiving equipment.
- Satellite systems generally work on the basis of having a decoder module which decodes the satellite signal received in order that the transmission may be accurately produced on screen.
- decoder modules may work in conjunction with a card system. This comprises of a card reader which allows the decoder to operate on insertion of an encoded card. Such systems are adequate when only one card is necessary to view the satellite channels available. However, there are instances where two or more cards may be required, each card providing access to a different set of satellite channels. The problem with such a system is that the cards may be easily misplaced and, in addition, the constant insertion and removal of cards into the decoder can lead to system malfunctions as both the card and the reader can wear with use.
- a still further problem which has arisen with the growth in availability of satellite channels is that the-increasing number of channels available to a watcher means that it has become increasingly difficult to keep track of the times and channels of programmes which the watcher may wish to view.
- a still further problem which can arise as a result of the availability of large numbers of channels is that if a second satellite transmission system is to be accessed it may be necessary to have a second receiving dish and a second set of cabling.
- the said system generated signal is produced by comparing the present picture signal with an adjacent picture signal and generating a signal to cover each noise signal based on said adjacent picture signal.
- each noise signal is replaced by a colour signal which corresponds to the colour signal which appeared in that position adjacent the noise signal. In this way the picture definition can be improved.
- apparatus for connecting a plurality of card readers to a satellite transmission decoder module comprising an interface unit for fitment between said card readers and said decoder module, said interface unit providing automatic switching between said card readers.
- the system may be set up to provide a once only monitoring facility or may alternatively have a repeat monitoring facility.
- the noise signal is then replaced by a colour signal as appropriate by a sparkle painter device 5.
- This colour is derived by reference to the colour which appeared in the appropriate picture position immediately previous to the appearance of the noise signal.
- the signal is reconverted by a digital-to-analogue converter 6 and is subsequently displayed on the TV screen.
- the information can be stored and analysed by frame, by line or by portions thereof.
- Fig. lb shows a developed embodiment of the first aspect of the invention, including A/D and D/A conversion means, control means, random access memory, comparison means and buffers consituting a delay line for storing successive portions of the picture signal for .analysis and processing prior to output.
- FIG. 2a a conventional satellite decoder and card reader arrangement is shown.
- a card reader 10 has a slot which receives a keycard which is encoded. On reading the encodement on the card the system will activate the decoding module so as to receive the desired satellite channel. However, any one card will only provide access to a certain number of channels and thus if alternative channels are to be viewed a second card will be necessary. In such a case changing between available channels may necessitate the removal of one card and insertion of another card into the card reader 10. To overcome this problem the system illustrated in Fig. 2b is proposed. In this system two card readers 11 and 12 are provided, each connected to an interface unit 13 which in turn connects to a decoder module 14.
- a second programme provider using the same encryption system but requiring a different card can be accessed via the second card reader 12 with the interface unit allowing for automatic selection between the card readers as desired. More than two card readers can be connected to the interface unit depending upon the number of cards required.
- a programme and monitoring unit is included in the satellite system which allows a user to programme the system with information and programmes which they wish to view in the future.
- the system monitors available transmission channels and when the selected programme is about to commence the indicator on the unit alerts the user to the fact that the programmed channel is about to commence with an item of interest.
- the system may provide an independent indication of programme or may display the information regarding which channel should be viewed on screen, or indeed may be programmed to change channel to the desired channel automatically.
- the system can operate with a conventional TV unit, satellite unit, or indeed with a video recorder. In the conventional TV mode, regardless of which channel is being viewed, the TV screen would display the other channel number which relates to the programme. For example, if the TV is presently tuned to BBC1 and in the pre-programmed programme is on BBC2 a display will appear on the screen with the message "turn to BBC2".
- a satellite system When a satellite system is included in the viewing system the operation would be similar with the desired channel, whether it be on the satellite system or on conventional TV, being displayed with a similar message, such as "turn to BBC1". If a video unit is included in this over-all system then operation may be similar with an on-screen message being displayed even when a video is in the process of playback.
- the system may be programmable with a once-only facility, whereby the programme cancels once the message has been displayed or alternatively a repeat facility would allow the message to be displayed each time the desired programme appears in the programming schedules.
- the means of programming the system may be similar to the programming of a video cassette recorder for the automatic recording of transmissions.
- the cable which connects a satellite receiver 20 to the LNB (Low Noise Blockdown Converter) 21 on the dish is a co-axial cable with one centre core and a surrounding screen.
- the two normal connecting methods are shown in Fig. 3a.
- a single voltage signal is sent from the receiver 20 to the LNB 21 and switches on the LNB so the received signal may then travel back down the cable to the receiver 20.
- a two-level voltage signal may be sent from the receiver 20 to the LNB 21 which is switchable between two modes depending on which of the two voltage signals it receives and thus the appropriate signal may be received by the receiver 20.
- a further signal can be transmitted along the cable from the receiver 20 to the dish section.
- an interface unit 22 can switch between two or more different LNBs 21 on the same dish or between two LNBs on different dishes.
- the generation of the signal for operating the interface unit is provided by the receiver 20 with the interface unit 22 provided at the dish.
- the interface control signal for selecting between LNBs/dishes may be a tone signal or a coded pulse type signal.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9119183.3 | 1991-09-07 | ||
GB919119183A GB9119183D0 (en) | 1991-09-07 | 1991-09-07 | Improvements in satellite transmission and receiving equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1993005613A2 true WO1993005613A2 (en) | 1993-03-18 |
WO1993005613A3 WO1993005613A3 (en) | 1993-05-13 |
Family
ID=10701092
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1992/001633 WO1993005613A2 (en) | 1991-09-07 | 1992-09-07 | Improvements in satellite receiving equipment |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2519992A (en) |
GB (1) | GB9119183D0 (en) |
WO (1) | WO1993005613A2 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4398210A (en) * | 1981-06-22 | 1983-08-09 | Rca Corporation | Impulse noise detection circuit for TV signals |
JPS6080388A (en) * | 1983-10-11 | 1985-05-08 | Sony Corp | Noise eliminating circuit |
EP0433866A1 (en) * | 1989-12-22 | 1991-06-26 | STMicroelectronics S.r.l. | Method and an apparatus for reducing noise of the pulsive type in digital video receiver sets |
-
1991
- 1991-09-07 GB GB919119183A patent/GB9119183D0/en active Pending
-
1992
- 1992-09-07 WO PCT/GB1992/001633 patent/WO1993005613A2/en active Application Filing
- 1992-09-07 AU AU25199/92A patent/AU2519992A/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4398210A (en) * | 1981-06-22 | 1983-08-09 | Rca Corporation | Impulse noise detection circuit for TV signals |
JPS6080388A (en) * | 1983-10-11 | 1985-05-08 | Sony Corp | Noise eliminating circuit |
EP0433866A1 (en) * | 1989-12-22 | 1991-06-26 | STMicroelectronics S.r.l. | Method and an apparatus for reducing noise of the pulsive type in digital video receiver sets |
Non-Patent Citations (2)
Title |
---|
ICASSP 86 PROCEEDINGS - TOKYO, JP - 7-11 APRIL 1986 vol. 4, April 1986, pages 2451 - 2454 NAQVI ET AL. 'An Application of Median Filters to Digital Television' * |
PATENT ABSTRACTS OF JAPAN vol. 9, no. 219 (M-410)(1942) 6 September 1985 & JP,A,60 80 388 ( SONY ) 8 May 1985 * |
Also Published As
Publication number | Publication date |
---|---|
WO1993005613A3 (en) | 1993-05-13 |
GB9119183D0 (en) | 1991-10-23 |
AU2519992A (en) | 1993-04-05 |
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