CIRCUIT ARRANGEMENT FOR PROCESSING A BAND OF DIGITAL TELEVISION CHANNELS

Abstract: The circuit arrangement comprises an input section (IS, DC) for receiving a band of digital television channels, a signal processing section (uP, LLC, TLC), a power supply (PS), and an output section (PHY) for supplying one or several television receivers (TV1-TV3, PC) with one of said television channels. The output section (PHY) comprises an IEEE 1394 port for a connection to television receivers (TV1-TV3, PC) for providing data transmission in both directions, and the circuit arrangement comprises a power down mode in which at least parts of the input section (IS, DC) and the signal processing section (uP, LLC, TLC) are switched off, when none of said television receivers is active. In this power-down mode the circuit arrangement is in a standby mode in which advantageously only the power supply (PS) and the physical layer (PHY) of the output section are active. The circuit arrangement (SAR) is in particular a digital satellite receiver or a settop box.

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PJ Hi PJ 0 CD • CD Pi tr o rt ϋ tr O cn μ- 3 0 rt μ- μ- H i-i Hj - i 0 ø CD Hi μ- PJ J o PJ n O <! 3 cn TJ Q CQ 1 -3 3 Pi O rt 0 ø ≤ CQ CQ Φ Hi Φ μ- 0 μ- PJ H- CD ii Φ Pi Pi ti 0 Hi 0 m i ø PJ CQ rt Hi 0 φ Q tr J Hi "i.LINK" or HPSB (High Performance Serial Bus), or "Fire ire". This bus allows the transmission of digital audio and video data in real time with high data rates in both directions. Information about the IEEE 1394 bus is provided by computer literature, for example PC Magazin June 2000, pages 180ff., or from the 1394 Trade Association (www.1394ta.org). The 1394 bus is already widely used in computer products as for example in personal computers or note books, or in digital camcorders. IEEE 1394 is an international standard with a low cost digital interface that will integrate entertainment, communication and computing electronics into consumer multimedia. There are two types of IEEE 1394 data transfer: asynchronous and isochronous data transfer. The asynchronous data transfer is a traditional computer memory mapped, load and store interface. Data requests are sent to a specific address and an acknowledgement is returned. Isochronous data channels provide a data transport at a predetermined rate in a streaming mode, using an isochronous channel identification number (ID) . The protocol for the IEEE 1394 bus is arranged in three layers: the transaction layer converts the data of the IEEE 1394 bus to a parallel bus of the corresponding device using a control and status register set (CSR) according to IEEE 1212, and is arranged as a software or firmware. The transaction layer is coupled to the link layer, which generates the data packages for the asynchronous and synchronous modes according to the specification of the IEEE 1394 bus, and which provides the error correction and the addressing to a certain device. The link layer provides also the data transmission for the .isochronous channel. The link layer is coupled to the physical layer, which comprises the line drivers and initialization, arbitration and plug-and-play logic. It recognizes new installed devices and provides an identification address for the data transmission between the devices of the bus. The physical layer is coupled to the transaction layer via the link layer, and is coupled to the input/output port of the device for providing the data transmission. As the cable connections twisted pair lines with four wires are used for the data transmission, optionally six wires are also possible, when a supply voltage is required. For longer line connections a transmission via Plastic Optical Fiber (POF) or multi mode optical glass fiber is possible. The voltage supply is provided via the separate cable pair and provides 8 to 33 V with a maximum of 1,5 A for one port. The physical layer provides one or more output ports for a connection to other devices, and up to 63 devices can be coupled to one IEEE 1394 bus, arranged in parallel and in series, the series connections being restricted to a maximum of 16. The IEEE 1394 bus can be used also with high frequency transceivers for working as a wireless network. As a new standard for wireless transmission of consumer electronics devices via the IEEE 1394 bus the so-called "COMMEND" standard is being established. For providing an inter brand operability of consumer electronics devices for a transmission of data via IEEE 1394, the device specification HAVi (Home Audio Video Interoperability) is known, which allows a user-friendly control of these devices in homes (www.havi.org). It allows a control of a digital home-network with audio and video devices via the IEEE 1394 bus, for example by using an on-screen display of a television receiver. 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H CQ 0 n T5 φ 3 CQ rt φ > 0 ø rt Φ 3 rt μ- ω TJ φ Φ Φ Hi V£ * Hj tr Ω φ tr CQ o PJ J 0 ø 3 Pi PJ it * . Φ rt ø φ μ- ^ Hi Hj Hi * - rt Φ H μ- rt 0 Φ Φ 0 0 rt ø 0 is sufficient for example for a home or even a building with several apartments. Because in a home usually only for a few hours of the day a television receiver is switched on, the circuit arrangement can switch off automatically essential electronic circuit parts consuming the main part of power of the circuit arrangement . Because the bus management is provided by the physical layer of the IEEE 1394 bus, the circuit arrangement switches to a power down mode, in which advantageously only the physical layer and the power supply are on. The power supply has to be able to provide a low power standby mode and therefore the total power consumption in the power down mode can be below 5 Watts. When compared with the power consumption in on- ode, which may be in the range of 30 to 50 Watts, the power down mode of the circuit arrangement leads to a considerable cost reduction for a user. When a six-wire IEEE 1394 cable is used for connecting the circuit arrangement to the television receivers, the physical layer of the circuit arrangement can be powered also by one of the television receivers being in on-mode. Then the power supply of the circuit arrangement can be switched off also. When a user switches on one of the television .receivers and requests a respective television program, the physical layer switches on the circuit arrangement. In case of a digital satellite receiver, the low noise converter of the satellite antenna can be switched off also in the power down mode. The satellite receiver may be arranged also close to the satellite antenna, because a complete remote operation is performed by using the television receivers via the IEEE 1394 bus. Only one output cable from the satellite receiver to the television receivers is sufficient because IEEE 1394 satellite receivers can be arranged chain like and in parallel . The invention is further explained by way of a preferred embodiment with reference to the figures, which show: Fig. 1 The arrangement of a digital satellite receiver being coupled with television receivers, and Fig. 2 a digital satellite receiver coupled to a television receiver. The house H with two floors shown in fig. 1 comprises a satellite antenna A on the roof for receiving a band of television channels via satellite. A digital satellite receiver SAR is arranged close to the satellite antenna A below the roof and connected via a coaxial cable HF to the low noise converter LNB of the satellite antenna A. The power for the LNB is supplied via the cable HF by the satellite receiver SAR. Several rooms of the house are equipped with television receivers TV1, TV2 and TV3 , and one of the rooms also with a personal computer PC. In this special arrangement the television receivers TV1 and TV2 are connected directly via IEEE 1394 cables FF1, FF2 to the satellite receiver SAR, being arranged in parallel. The personal computer PC is connected via an IEEE 1394 cable FF3 to the television receiver TV1, and the television receiver TV3 is connected via a further IEEE 1394 cable FF4 to the personal computer PC. The television receivers TV1 - TV3 and the personal computer PC are therefore all coupled to one output section of the satellite receiver SAR, the physical layer (PHY) of the IEEE 1394 bus, for digital data transmission in both directions. When a user requests a wanted television program with one of the television receivers TV1 - TV3, or the PC, the selected television receiver demands via an asynchronous data set from the satellite receiver SAR the requested television channel. This channel is provided then by the satellite receiver SAR via an isochronous transport mode, in which the data blocks are equipped with a -so called isochronous channel identification number for device allocation. The further television receivers can receive a television channel in the same way in parallel from the satellite receiver SAR. Therefore all the television receivers can be supplied with an individual television channel at the same time by only one digital satellite receiver SAR with one output section. Limitations are only data rates, because for one television channel a data rate of about 7 or 15 MHz is required and via an electrical IEEE 1394 connection a maximum data rate of 100 or 200 MHz is possible, and further, that only 63 devices can be coupled together via the IEEE 1394 bus. For the cable connections, thin and inexpensive cables are used. Via a copper cable for example , a data rate of 100 MHz can be provided with a cable length up to 25 m. For longer IEEE 1394 connections, or for connections from room to room, also wireless transmissions may be used. Because of the IEEE 1394 bus management, the satellite receiver SAR can switch to a power down mode when no television channel is required by a television receiver, to save energy. In this power down mode the essential parts for providing the isochronous data transmission to the television receivers can be switched off, as further explained according to Fig. 2. Also the power supply to the low noise converter LNB can be switched off. Essential is only, that the physical layer (PHY) of the IEEE 1394 bus inside the satellite receiver SAR is active for receiving asynchronous data from the television receivers. In case of a demand from a television receiver, the physical layer switches the satellite receiver SAR from the power down mode to the normal mode, in which all circuits of the satellite receiver are active .' As a further embodiment the circuit arrangement of the invention may represent a digital settop box, which is linked via cable to a television channel provider. The settop box can provide then also several television receivers at the same time with a certain television programs via an IEEE 1394 port in the same way as the satellite receiver SAR. The settop box is then also able to switch to a power down mode when no television channel is required by a television receiver for saving energy. The digital satellite receiver SAR is explained in more detail now according to Fig. 2. It comprises an input section IS having amplifiers and/or filters for receiving the high frequency signal of the low noise converter LNB via the cable HF, usually a coaxial cable. The output signal of the LNB, which is in the range of 1 - 2 GHz, is then down converted by a down-converter DC into a base band, in which the digital data of the television channels can be processed and separated by a signal processing circuit, for example in a microprocessor μP. The circuit part of the IEEE 1394 bus within the satellite receiver SAR consists of the physical layer PHY, the link layer controller TLC and the transaction layer controller LLC. Via the transaction layer controller TLC and the link layer controller LLC an isochronous transport mode is established, with which a requested television channel is provided via the physical layer PHY and the cable FF1 to the television receiver TV1, or to another television receiver. All circuit parts of the satellite receiver SAR are supplied with power via lines 1, 2, and 3 by a power supply PS, for example a switched mode power supply (SMPS) . With the physical layer PHY and line 1 a control of the power supply PS is possible for switching off of the respective circuit parts in the power down mode, or to t μ l o l o l CQ ID rt Φ M μ- rt Φ Hi Φ Ω Φ μ- < Φ Hi CD ϋ μ- cn φ ø PJ tr Φ Pi

Claims: t t μ μ Ul o uι o Ul o . ω CO .--. T) ffi — K! PJ Hi Φ Ul % μ- r Ω tr Φ . 0 Hi Hi • 5. Circuit arrangement according to claim 4 , characterized in that the microprocessor (μP) of the circuit arrangement is switched off also or is in a low power mode . 6. Circuit arrangement according to one of the preceding claims 2 - 5, characterized in that the physical layer (PHY) is integrated in one integrated circuit or integrated within one integrated circuit . Circuit arrangement according to one of the preceding claims, characterized in that the circuit arrangement is a centralized digital satellite receiver or a centralized digital settop box. Circuit arrangement according to claim 7, characterized in that in the power-down mode the low- noise converter (LNB) of the satellite antenna (A) is switched off also. 9. Circuit arrangement according to one of the preceding claims 1-6, characterized in that the circuit arrangement is arranged as a centralized digital set- top box for receiving a band of television channels via cable. 10. Circuit arrangement according to one of the preceding claims, characterized in that the circuit arrangement (SAR) comprises a wireless IEEE 1394 output port for a wireless coupling to said television receivers (TV1-TV3, PC) . 11. Circuit arrangement according to claim 1, characterized in that during said power-down mode the circuit arrangement is in a standby mode in which the power supply (PS) is off and the physical layer (PHY) of the output section is powered externally via the IEEE 1394 bus.

Inventors: DREXLER MICHAEL, GAEDKE KLAUS, DREXLER, MICHAEL, GAEDKE, KLAUS
Applicants: DREXLER MICHAEL, GAEDKE KLAUS, THOMSON LICENSING SA, DREXLER, MICHAEL, GAEDKE, KLAUS, THOMSON LICENSING S.A.
Application year: 2001
Main classification: H04N5
IPC codes: H04L12, H04N5