Transmitting system, transmitter and receiver

FIELD: communication systems.

SUBSTANCE: transfer system for transfer of transport flow of MPEG-2 standard from transmitter 10 to receiver 14, having check channel 16, along which receiver 14 can transfer selection criterion for selection of information blocks of MPEG-2 standard to transmitter 10, transmitter 10 has selector 38, which receivers required criteria and then filters information blocks in accordance to these criteria prior to transfer.

EFFECT: higher efficiency.

4 cl, 3 dwg

 

This invention relates to the transmission of a compressed signal from the transmitter to the receiver via the transmission channel, in which the multiplexed signal has a lot of information blocks containing information about a compressed signal, and the transmission system has a feedback channel from the receiver to the transmitter.

The invention also relates to a transmitter for transmitting a compressed signal on the transmission channel, in which the multiplexed signal has a lot of information blocks containing information about a compressed signal.

The invention also relates to a receiver for receiving a compressed signal from a transmitter, in which the multiplexed signal has a lot of information blocks containing information about a compressed signal, and the receiver is connected to a return channel from the receiver to the transmitter.

The invention also relates to a method for transmitting a compressed signal from the transmitter to the receiver via the transmission channel, in which multiplexed signal has a lot of information blocks containing information about a compressed signal, and the transmission system has a feedback channel from the receiver to the transmitter.

The transmission system of the above type is known from the article "Breaking open the set top box" David Banks, Anthony Wiley and others(Proceedings of the SPIE, The International Society for Optical Engineering, 1998, vol.no. 3228, pp.105-116).

ICI the volumes of transmission for video, audio and other signals are often encoded in accordance with MPEG-2 standard. Signals that must be transmitted are encoded for the formation of elementary streams. These streams are then combined (condensed) for transmission and, thus, constitute the transport stream. A transport stream consists of packets. A package can contain part of the elementary stream and is supplied with a program ID (PI) of the corresponding elementary stream. Elementary stream can be recovered from the individual packages by PI. The package may also have information block containing information about elementary streams, for example, about the relationship between the program and the respective elementary streams of audio and video information of this program, or, for example, message management and control name. The transmitter sends all traffic to the receiver, which can then restore the elementary streams via IP. To read information blocks and restore the useful signals to the user.

The disadvantage of this system is that the volume of data traffic is always high, even when the user needs only one elementary stream. The above known system solves this problem by using a reverse channel through which the receiver can not miss the required FE elementary streams to the transmitter. The transmitter then selects packets containing one of these PIS, and only transmits these packets to the receiver. Due to this tracked save bandwidth.

The disadvantage of this system is that it selects only the desired elementary streams. Information blocks, which are also sent, are repeated at regular points in time, even when relevant information is not modified with respect to the previously transmitted block, or when the receiver does not need this information block. This means that still has a place wasteful use of bandwidth.

The objective of the invention is to provide a transmission system of the above type, which provides additional savings in bandwidth.

According to the invention this problem is solved in the transmission system, which is characterized by the fact that the receiver has means selection information blocks for transmission criteria to filter the information blocks in the transmitter feedback channel, the transmitter has means for filtering information blocks for filtering information blocks according to the received criteria and means forming a network for transmitting information blocks that satisfy this criterion.

In this transmission system, the receiver can specify what information he needed the s. The transmitter can filter out unwanted information from the transport stream according to the presented criteria. Because the information blocks are usually repeated on a regular basis, this system provides satisfactory save bandwidth.

One of the embodiments characterized in that the filtering information blocks configured to implement at least one of the positive and negative filtering. Both filtering methods have their own advantages. The specific choice of one of them depends on the type of information that should be filtered. When using a positive filter is selected and transmitted to the receiver only information that satisfies the specified criteria. When using a negative filter is used only information that does not satisfy the given criteria.

Another option implementation differs in that the means forming network configured to transmit the selected information blocks by additional channel of transmission. This implementation has the advantage that the receiver is not required to select information from the transport stream, which is an operation requiring considerable time due to the large number of packets elements is ary streams in the transport stream.

Also the task of the invention is to provide a transmitter of the above type which provides additional savings in bandwidth.

According to the invention this problem is solved in the transmitter, which is characterized in that it has a filtration media designed to filter information blocks according to the criteria and means forming a network for transmitting information blocks that satisfy this criterion. The transmitter can filter out unwanted information from the transport stream according to the presented criteria. Because the information blocks are usually repeated on a regular basis, this system is monitored satisfactory saving bandwidth. The variant of implementation of the transmitter differs in that the filtering information blocks configured to implement at least one of the positive and negative filtering. Both filtering methods have their own advantages. The choice of a particular method depends on the type of information that should be filtered. Using positive filter is selected and transmitted to the receiver only information that satisfies the specified criteria. When negative filtering is only used information that is not UD is vitvoryaet given criteria.

Another variant implementation of the transmitter differs in that the filtering information blocks configured to add the presented filtering criteria to the set of criteria in response to reception of the specified presents filtering criteria. Using this set, the transmitter can easily apply multiple criteria to a single transport stream. This set can be implemented, for example, using a memory or buffer of any type in the transmitter.

Another variant implementation of the transmitter differs in that the filtering information blocks configured to remove a criterion from a set of criteria after filtering, only information that satisfies the specified criteria. In this embodiment, the receiver may provide a filtering criterion that will fit most of the information block. By using, for example, a negative filter, which filters out all information blocks, it can effectively block the transmission of all blocks. He can then present a positive criterion, which should be used only once, when you want information specific information block. The transmitter then filters this unit and transmits it to the receiver, and then delete the et this criterion, so it is no longer transmitted information blocks. This is a very effective way to save bandwidth.

Another variant implementation of the transmitter differs in that the filtering information blocks configured to remove the criterion from the set when the specified criterion received a request for cancellation. The requirement of cancellation may be sent, for example, by the receiver. This allows the receiver to cancel any criteria that he presented earlier.

Also the task of the invention is to provide a receiver of the above type, which provided additional savings in bandwidth.

According to the invention this problem is solved in the receiver, characterized in that it has means selection information blocks for the view criteria to filter the information blocks to the transmitter via a reverse channel.

The variant of implementation of the receiver differs in that the means of selection information blocks configured to send demands the abolition of defining specific criteria in the transmitter to stop filtering information blocks transmitter according to this particular criterion.

Also object of the invention is to provide a method of the above type, which provides additional savings in bandwidth frequent the so -

According to the invention this problem is solved in the method, characterized in that the receiver is the criterion for filtering information blocks to the transmitter via a reverse channel transmitter filters the information according to the presented criteria and passes the information blocks that meet the criteria.

These and other aspects of the invention are explained below with reference to embodiments of illustrated drawings, which represent the following:

figure 1 - diagram of the transmission system according to the invention;

figure 2 - diagram of the receiver according to the invention; and

figure 3 - diagram of the transmitter according to the invention.

In all drawings, the same reference positions denoted by similar or corresponding elements. Some of the items indicated on the drawings, are implemented using software, and as such are software categories, such as software modules or objects.

The transmission system of figure 1 includes a channel 12 of the transmission for transmitting a compressed signal from the transmitter 10 to the receiver 14. In the embodiment shown in figure 1, the multiplexed signal is a transport stream of the MPEG-2 standard. In addition to the many elementary streams transport stream includes a lot of information blocks containing in is ormatio about elementary streams. These information blocks include, for example, spreadsheet software plan (CCI), which outlines the relationship between each program in the transport stream and IP respective audio and video signals, or table conditional access (ACL)entries, which includes the names and management, through which access to the specified flow is limited to registered users.

The transmission system is also provided with a reverse channel 16 from the receiver 14 to the transmitter 10. This reverse channel may represent, for example, a connection to the Internet or to a separate channel in the same transmission medium, which includes the transmission channel.

As follows from the description of figure 2 and 3, the receiver is designed to transfer the criterion for selecting at least one information block to the transmitter via a reverse channel, and the transmitter is used to select information blocks that meet the adopted criteria, and to transmit selected information blocks.

In a particular embodiment, the transmission system is also provided with an additional channel 18 of the transmission in which the transmitter 10 may transmit the selected information to the receiver. The receiver 10 is not necessary to select information from the transport stream, which is the operation, rebuya time-consuming due to the large number of packets of the elementary streams in the transport stream.

As shown in figure 2, the receiver has a control block 20, a network interface 22, the demultiplexer 24 and the decoder 26. Transport stream transmitted through the channel 12 of the transfer, is received by the network interface 22 and is transmitted to the demultiplexer 24. This demultiplexer restores individual elementary streams and drops them to the decoder 26. The demultiplexer 24 also includes a Bank of filters 28 information blocks in which information is read from the transport stream so that they can be processed separately. Unit 20 controls and checks the other blocks of the receiver.

The receiver can be represented as, for example, a set-top-box connected to a television receiver, whereby the user can receive video, audio and other signals. The receiver also has a monitor 29 selection information blocks that form the criteria for selection of information blocks. A possible criterion is the version number of the desired information block. The receiver thus indicates that it wants to receive only the information block with its version number is higher than the version number that is installed in the criteria. Another possible criterion is the time when the receiver needs to receive the information blocks that are created or modified after athomemart time. Possible, and many other criteria. As shown below, criteria can be defined in many ways, depending on the type of information that is filtered.

The monitor 29 then sends the generated criteria to the transmitter via a reverse channel 16. The monitor 29 can also use the reverse channel 16 to signal the transmitter that it should stop filtering according to the previously passed the criteria.

The transmitter shown in figure 3, is designed to transfer transport stream via the network interface 34 on the transmission channel 12. In the shown embodiment, the transmitter has an encoder 30, which forms a set of elementary streams of the presented signals, and the multiplexer 32, which combines elementary streams and the corresponding information in the transport stream. In another embodiment (not shown), the transmitter 10 receives already formulated the transport stream itself only ensures that this traffic was transmitted to the receiver 14. In this case, you do not need to include the encoder 30 and the multiplexer 32 in the transmitter 10.

The transmitter also has unit 36 controls the selector 38, which may take many criteria on the backward channel 16. Unit 36 controls and checks the other blocks of the transmitter. The selector 38 posted by m is waiting for the multiplexer 32 and network interface 34 and passes only the information blocks, that meet one or more standards.

The filtering criteria may be applied once or repeatedly. The use of criterion only once provides the possibility of choosing a single information unit. This is explained in more detail below. Continuous filtering allows you to receive one or more information blocks that satisfy the specified criteria, will be accepted until a certain condition, for example, when the receiver indicates that the filter should stop.

Filtering can be performed using different levels of detail for the criterion. As a minimum, must be defined FE elementary stream from which will be filtered information blocks. Filtering can be implemented in more detail by adding an identifier for an information block, or table, which should be, in particular, filtered from this elementary stream.

More advanced filtering criteria can be implemented using positive and negative filtering. Using positive filter is selected and transmitted to the receiver, only information that satisfies the specified criteria. When negative filtering is only used information that is not of udovletvor the t given criteria.

In particular, positive and negative filtering can be implemented at the bit level by defining criterion as a mask, which should be applied using a bitwise "And" to the information block, which must be filtered. If the output result of applying the mask satisfies the specified criteria, then the information unit meets the criteria. Depending on the positive or negative type of filtering, the information block is selected or filtered. It may be necessary to specify in the criteria shift with which to begin applying the mask.

In the embodiment shown in the drawing, the resulting transport stream is transmitted by the network interface 34 to the receiver through the transmission channel 12. In another embodiment (not shown), the selector 38 removes all information blocks that do not meet one of the accepted criteria of the transport stream. Information blocks that satisfy the criteria are passed to the network interface 34, which transmits them to the receiver through the channel 18 of the transfer.

The selector 38 is preferably configured to maintain a set of criteria, which were represented by one or more receivers previously. The selector 38 can then filter all the information the blocks according to the criteria in the set. The set can be implemented, for example, using a memory or buffer of any type in the transmitter.

Receivers can send to the selector 38 demand the abolition of the fact that a particular criterion should be used. The selector 38 then removes it from the set. The criteria can also be removed for other reasons, for example, because the criterion is of limited use, and this time was exceeded.

The criterion can also be removed from the set when it was used to filter only the information block. The receiver 14 may represent, for example, a negative filter that filters out all information blocks. Thus, it can effectively block the transfer of all information blocks. The receiver 14 can then present the criterion for a positive filter that will be used only once, when the receiver needs information specific information block. The transmitter 10 then filters this information and transmits it to the receiver, and then removes this criterion, resulting in the other data blocks are not transmitted. This is a very effective way to save bandwidth.

1. Transmission system for transmitting a compressed signal from a transmitter (10) to the receiver (14) through the channel (12) of the transmission, the rich multiplexed signal contains many elementary streams and a lot of information blocks, contains information about elementary streams, the transmission system has a reverse channel (16) from the receiver (14) to the transmitter (10), characterized in that the receiver (14) includes means (29) selection information blocks for the view criteria to filter the information blocks to the transmitter (10) on the backward channel (16)and the transmitter (10) comprises means (38) filtering information blocks for filtering information blocks according to the criteria and means (34) forming a network for transmitting information blocks that satisfy this criterion.

2. Transmission system according to claim 1, characterized in that the means (38) filtering of information blocks is configured to implement at least one of the positive and negative filtering.

3. Transmission system according to claim 1, characterized in that the means (34) forming network is configured to send the selected information blocks by additional channel (18) of the transfer.

4. The transmitter (10) for transmitting a compressed signal on the channel (12) of the transmission, and multiplexed signal contains many elementary streams and a lot of information blocks containing information about elementary streams, characterized in that the transmitter (10) comprises means (38) filtering information blocks to filter the information the data blocks according to the criteria and means (34) forming a network for transmitting information blocks, which satisfy the above criteria.

5. The transmitter (10) according to claim 4, characterized in that the means (38) filtering of information blocks is configured to implement at least one of the positive and negative filtering.

6. The transmitter (10) according to claim 4, characterized in that the means (38) filtering information blocks made with the possibility of adding the presented filtering criterion in the set of criteria in response to reception of the specified presents of filter criteria.

7. The transmitter (10) according to claim 6, characterized in that the means (38) filtering information blocks are designed to remove the criterion from the set of criteria after filtering, the only section of information that satisfies the specified criteria.

8. The transmitter (10) according to claim 6, characterized in that the means (38) filtering information blocks are designed to remove the criterion from a set of criteria for when the specified criterion is adopted, the requirement of cancellation.

9. The receiver (14) for receiving a compressed signal from a transmitter (10), and multiplexed signal contains many elementary streams and a lot of information blocks containing information about elementary streams, and the receiver (14) is connected to return channel (16) from the receiver (14) to the transmitter (10), characterized in that the receiver is (14) includes means (29) selection information blocks for the view criteria to filter the information blocks to the transmitter (10) on the backward channel (16).

10. The receiver (14) according to claim 9, characterized in that the means (29) selection information blocks are designed to make demands the abolition of defining specific criteria, to the transmitter (10) to stop the transmitter (10) filtering information blocks according to this particular criterion.

11. A method of transferring a compressed signal from a transmitter (10) to the receiver (14) through the channel (12) of the transmission, and multiplexed signal contains many elementary streams and a lot of information blocks containing information about elementary streams and the transmission system has a reverse channel (16) from the receiver (14) to the transmitter (10), characterized in that the receiver (14) is the criterion for filtering information blocks to the transmitter (10) on the backward channel (16)and the transmitter (10) filters the information according to the presented criteria and passes the information blocks, which satisfy the above criteria.



 

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