Abstract:
A TV signal receiver has a tuner for deriving a first TV signal from the input signal, and a device for storing in a memory and reading therefrom a plurality of blocks of a second TV signal derived from the input signal. The first TV signal has interruptions during which a block of the second TV signal is insertable so as to obtain a composite TV signal which is supplied at an output terminal of the receiver.

Description:
BACKGROUND OF THE INVENTION 
     The invention relates to a TV signal receiver. Generally, TV programs of a given length are regularly interrupted by, for example commercials or other information. Such messages are usually concentrated in a standard packet which is sent to everyone. Many viewers regard at least a pat of such a packet as being useless, for they prefer information about other subjects such a s, for example stock exchange news or the weather forecast instead of commercials, or they p refer, for example commercials about products in which they are specially interested. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a TV signal receiver with which it is possible to adapt the contents of second TV signal blocks referred to as information signals, which do not form part of the first TV signal, for example a movie, and become available at the output terminal of the TV signal receiver. 
     To this end, the TV signal receiver according to the invention has an input terminal for receiving an input signal, a tuner for deriving a first TV signal from the input signal, and memory controlled by control means for storing therein and reading therefrom a plurality of blocks of a second TV signal derived from the input signal. The first TV signal has interruption intervals during eachof which a block of the second TV signal is ensertable, the interruption intervals being provided with a first control signal for controlling the memory in such a way that at least one block of the second TV signal block is read from the memory for insertion into an interruption interval in the first TV signal so as to obtain a composite TV signal. The receiver has an output terminal at which the composite TV signal is supplied. 
     In this way, second TV signal blocks which do not form part of the first TV signal, referred to as the main signal, can be selectively added to the main signal via the signal receiver. These second TV signal blocks are stored in a memory in the receiver from which they are read again at the moment when there is an interruption in the main signal. This is effected in response to a first control signal comprising information about the positions of the interruptions. For example, the first control signals may precede the interruptions in the input signal. They may also be present, for example at the start of the interruptions. The second TV signal blocks are linked with a second control signal. Said second control signal has to activate the memory controller in time so that the second TV signal blocks can be stored when they arrive. The first and the second control signals are detected by the memory controller, which may, for example, comprise one or more detectors or may consist of a control system unit. 
     The TV signal receiver is switchable between two modes. In the first mode, second TV signal blocks are read from the memory and inserted into the interruptions in the first signal. In the second mode, the second TV signal blocks received at the input terminal are stored in the memory where they constitute an assortment of second TV signal blocks. In both cases, use is made of a control signal which ensures that the second TV signal blocks are inserted or stored at the suitable moment. 
     Moreover, the TV signal receiver may be provided with input means with which a profile of second TV signal blocks of the desired contents can be selected. Such a selection may take place before the second TV signal blocks are sent to the receiver. In that case, a signal supplied from an output terminal of the signal receiver is sent with the relevant information to the broadcaster or service provider which subsequently only sends the desired second TV signal blocks and, based on a control signal, switches the TV signal receiver to the second mode so that the second TV signal blocks can be stored in the memory. 
     Instead of the user making his choice via the input means, the broadcaster or service provider may monitor the content of the second TV signal blocks himself. To this end, the broadcaster or service provider may determine the preferential profile based on the situation of the user. Elements such as the age of the user and his purchasing behavior during a certain period may play an important role. 
     If the relevant information remains stored and if this information is not sent to the broadcaster or service provider, the broadcaster or service provider may send a full packet of second TV signals to the device and store them in the memory. In this case, the selection is made known to the memory so that only second TV signal blocks having the desired contents are retrieved from the memory by means of a selector and inserted into the interruptions. 
     The selection may take place before the information packets are stored in the memory. Then, the memory will only comprise the information of which the content meets the preferential profile. In this way a smaller memory would suffice. 
     Further, it is proposed to make the same second TV signal blocks frequently insertable, so that the user has the opportunity to watch the same message more than once. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     These and other aspects of the invention are apparent from and will be elucidated with reference to the embodiments described hereinafter. 
     In the drawings: 
     FIG.  1 ( a ) and  1 ( b ) show a first and a second embodiment of a system provided with a broadcaster or service provider and at least one TV signal receiver according to the invention; 
     FIG. 2 shows a third embodiment of a system provided with a broadcaster or service provider and at least one TV signal receiver according to the invention, in which a profile of desired second TV signal blocks is made known to the broadcaster or service provider; 
     FIG. 3 shows a fourth embodiment of a system provided with a broadcaster or service provider and at least one TV signal receiver according to the invention, in which the preferential profile of second TV signal blocks is presented to the memory in the receiver; and 
     FIG. 4 is an example of recording second TV signal blocks on a longitudinal recording medium. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG.  1 ( a ) shows diagrammatically a system  1  comprising a broadcaster or service provider  3  and a TV signal receiver  5 . In practice, more than one TV signal receiver will be connected to the broadcaster or service provider  3 . The TV signal receiver  5  has an input terminal  7  and an output terminal  9 . The TV signals transmitted by the broadcaster or service provider  3  are received at the input terminal  7  of the TV signal receiver  5 . This will be further referred to as the input signal. The input signal may be split up into two different types of signals. The first type relates to the first TV signals, in other words, the main programs. These first TV signals have interruption intervals. The second type relates to the second TV signal blocks comprising information such as commercials, stock exchange news, the weather forecast, or commercials on given subjects, etc. The contents of such information are, however, often considered to be too diverse by the user who wishes to receive, for example only information about given subjects. It is an object of the invention to provide a solution in this respect. 
     The input signal received at the input terminal  7  is applied to a tuner  11  so that a particular first TV signal is selected from the input signal. The receiver includes detection mean which may comprise two detectors  13 ,  15 . Each of the first TV signals has a first control signal with which the position of the interruptions is indicated. This control signal is analyzed by the first detector  13 , which is arranged following the tuner  11 . 
     The input signal may also comprise one or more second TV signal blocks. The second TV signal blocks are linked with a second control signal which is detected by the second detector  15 . When the detector  15  detects such a control signal, it will activate a memory  17  in such a way that the second TV signal blocks will be stored in this memory. 
     When the first detector  13  signalizes occurance of an interruption in the first TV signal selected by the tuner I 1 , this detector will subsequently activate the memory  17 . The memory  17  will send one or more of the stored second TV signal blocks to a signal-combining unit  19  which also receives the first TV signal selected by the tuner  11 . The first detector  13  not only activates the memory on the basis of the first control signal but also the signal-combining unit  19 . In response to the first control signal, the second TV signal blocks are inserted into the interruptions in the first TV signal at the appropriate moment in the signal-combining unit, so that a composite TV signal is obtained. The composite TV signal is subsequently produced at the output terminal  9  of the receiver. 
     FIG.  1 ( b ) shows another embodiment of the TV signal receiver according to the present invention. The tuner  11  and the first and the second detector  13 ,  15  are here replaced by a first and a second tuner  12 ,  14  and a system control unit  16  constituting the detection means. The input signal received at the input terminal  7  is applied to a first tuner  12 , so that a first TV signal is selected from the presented first TV signals. The input signal is also applied to a second tuner  14 , so that the second TV signal blocks can be selected from the input signal. The second tuner  14  may be system controlled and decodes incoming messages before sending them to the memory. The first control signal which indicates the interruptions in the first TV signal and the second control signal which is linked with the second TV signal blocks are detected by the control system unit  16 . Said control unit  16  activates the memory in reaction to the second control signal, so that the second TV signal blocks can be stored when they arrive. In reaction to the first control signal indicating an interruption in the first TV signal, the memory is activated by the system control unit so that a second TV signal block will be sent from the memory to the signal-combining unit  19  to inserted in an interruption. For that purpose, the system control unit  16  also activates the signal-combining unit  19 . 
     The receiver is thus switchable between two modes. In the first mode, one or more second TV signal blocks are read from the memory and inserted into an interruption in the first TV signal. This is effected on the basis of the first control signal with which the interruptions are provided and with which the memory is activated so as to release stored second TV signal blocks. In the second mode, based on the second control signals, one or more second TV signal blocks are stored in the memory so that they can be inserted into the first TV signal at a later stage during possible interruptions. 
     The second TV signal blocks may be sent to the TV signal receiver at any moment because they can be stored in a memory anyway and can be retrieved at a later stage when there are interruptions in the first signal. 
     The TV signal receiver  5  is preferably provided as in FIG. 2 with input means  23  for presenting a preferential profile of themes or subjects about which information is desired. However, this profile may be presented in different manners. 
     FIG. 2 shows an embodiment in which another possibility of supplying a preferential profile is illustrated. The profile is supplied from an output terminal  21  of the TV signal receiver  5 . Moreover, feedback means  25  may be provided, ensuring that the signal supplied from this output terminal  21  is sent to the broadcaster or service provider  3  so that the broadcaster or service provider can send packets of second TV signal blocks with the desired profile to the TV signal receiver  5 . 
     FIG. 3 shows an embodiment in which a second possibility of presenting a preferential profile is illustrated. The memory  17  may comprise, for example, the full information packet of second TV signal blocks transmitted by the broadcaster or service provider  3  and the desired profile is passed on to the memory  17  with the aid of the input means  23 . To this end, the input means  23  are connected to the memory  17  via a selector  27 . When the memory  17  is activated by the first detector  13  on the basis of the first control signal with which the interruptions are provided, only second TV signal blocks selected via the selector  27  will be released by the memory  17  in dependence upon the preferential profile and inserted into the interruptions in the first TV signal. 
     The memory  17  may also contain only those information packets of which the content corresponds to the preferential profile of the user. The information added to the memory then consists of the preferential profile. All additional information comprised in the second TV signal blocks will not be stored. In this case, the preferential profile has to be entered before the information packets are added to the memory. The indication of the preferential profile acts a as filter for the information to be stored in the memory. Consequently, a smaller memory suffices. 
     Instead of the user making his choice via the input means  23 , the broadcaster or service provider  3  may monitor the content of the second TV signal blocks himself. To this end, the broadcaster or service provider  3  may determine the preferential profile based on the situation of the user. Elements such as the age of the user and his purchasing behavior during a certain period may play an important role. 
     In both FIGS. 2 and 3, the input means  23  may consist of, for example a keyboard. 
     It is remarked that in FIGS. 2 and 3, the tuner  11  and the detectors  13  and  15  can be substituted by a first and a second tuner  12 ,  14  and a system control unit  16 , in analogy with figure  1 ( b ). 
     The memory  17  may be implemented in different manners. The memory may be, for example a solid-state memory but also a magnetic record carrier. Examples of a magnetic record carrier are a hard disk or a longitudinal magnetic recording medium. An example of a longitudinal magnetic recording medium is described in the non-prepublished European patent application 96202074.9 (PHN 15.902) in the name of the applicant and is herein incorporated by reference. FIG. 4 shows an embodiment of the recording medium described in said application. The previously filed application already describes how a user can state his wishes with regard to information specially intended for him by making use of a menu. The subjects may be given a priority, thus providing a sequence for the second TV signal blocks to be inserted into the interruptions at a later stage. 
     When the TV signal receiver is switched to the second mode, the second signal blocks may be recorded, for example in the parts P 5  and P 6  of the tracks T 5  and T 6  on the record carrier. If necessary, more second TV signal blocks may of course be recorded in the parts P 5  and P 6  of the tracks. Position information about the position of the second TV signal blocks on the record carrier is stored in the directory which is recorded in the part P 5  of the tracks T 1  and T 2  so that the second TV signal blocks can be retrieved if an interruption in a received first TV signal is to be filled up. 
     As the content of the second TV signal blocks is tuned to the personal choice of a user, there is a better chance that the user wants to see the same message more than once. Therefore, the second TV signal blocks are frequently insertable.