JP4361353B2 - Digital broadcast receiver, broadcast program display method, and broadcast program recording method - Google Patents

Description

  The present invention relates to a digital broadcast receiver, a broadcast program display method, and a broadcast program recording method.

  Recently, digital broadcasting such as CS broadcasting, BS broadcasting, and terrestrial digital broadcasting has been started. Receivers for receiving these digital broadcasts are home (television receivers, personal computers, etc.), in-vehicle (navigation devices, etc.), portable (cell phones, PHS (Personal Handyphone System), PDA (Personal Digital Assistants). ) Etc.) is expected to be applied.

  This digital broadcast includes information data representing various contents in addition to video data and audio data constituting a broadcast program. As one of the information data, there is EPG (Electric Program Guide) data which is supplementary information for transmitting the broadcast contents to the viewer. Also, in digital broadcasting, the number of channels is enormous compared to conventional analog broadcasting, and it is necessary to select a broadcast program of interest from among many channels. For this reason, EPG data containing the program name, program content, program start time, program end time and other information is broadcast as supplementary information of the broadcast program.

However, in terrestrial digital broadcasting, there are differences in broadcasting contents depending on broadcasting stations (regions). Therefore, for example, “Drama on Monday at 9:00 am on TV A” that is viewed every week locally, such as traveling to other regions. When trying to view, there is a problem that even if an affiliated station is specified, it cannot be viewed because it is not broadcast on that station or the broadcast time zone is different. As a prior art for solving such problems, an EPG information distribution system described in Patent Document 1 has been proposed.
In the EPG information distribution system described in Patent Document 1, a server generates EPG information based on position information of a mobile terminal, and transmits this EPG information to the mobile terminal. As a result, the mobile terminal can obtain the channel selection information of the destination broadcast station.

JP 2003-158730 A

  However, in the system described in Patent Document 1, although the mobile terminal can easily obtain the channel selection information of the destination broadcast station, the server generates EPG information based on the location information of the mobile terminal. Since the EPG information is transmitted to the mobile terminal, there is a problem that a server is additionally required in addition to the normal broadcasting system.

  Therefore, the present invention has been made to solve these problems, and a user can view a desired broadcast program even when the broadcast date of the broadcast program changes at the destination without providing a server for generating EPG information. An object of the present invention is to provide a digital broadcast receiving apparatus, a broadcast program display method, and a broadcast program recording method.

In order to solve the above problem, the digital broadcasting receiving apparatus of the present invention is a digital broadcast reception device for receiving digital broadcasting, and storage means for storing program information of a plurality of broadcast stations, program information of the plurality of broadcast stations Generating means for generating a program guide table based on the program guide table, selecting means for selecting a broadcast program of the first broadcasting station to be viewed from the program guide table, and broadcast waves of the first broadcasting station by the selecting means. When the broadcast program of the first broadcast station to be viewed from the program guide table is selected in an area where cannot be received, program information of the second broadcast station that is an affiliated station of the first broadcast station is displayed. Control means for determining whether or not the acquired broadcast program is broadcast at the second broadcast station at a date and time different from that of the first broadcast station; and the broadcast program to be viewed is the second broadcast station. The first at the broadcasting station When broadcast different date and Okukyoku, characterized in that it comprises a notifying means for notifying the date and time when the broadcast program to the viewing is broadcast in the second broadcasting station.

  According to the present invention, when a program that a user intends to view in a mobile area cannot be viewed due to the program organization of the local station, it is determined on what day of the week when the program that the user intends to view in that area is broadcast. It can be known and recorded on a recording device at home without being confused, and a day of the week / time on which a desired program is broadcast can be reserved. Therefore, the user can view a desired broadcast program even when the broadcast date of the broadcast program changes at the destination without providing a server for generating EPG information, which has been necessary in the past.

According to another aspect of the present invention, there is provided a digital broadcast receiving apparatus for receiving a digital broadcast, a memory for storing a recording reservation date and time of a broadcast program broadcast on a first broadcast station, and the first broadcast station. When the mobile station moves to an area where the broadcast wave cannot be received, the program information of the second broadcast station that is an affiliated station of the first broadcast station is acquired, and the broadcast program reserved for recording is obtained at the second broadcast station. It is determined whether or not the broadcast program is broadcast at a different date and time from the first broadcast station, and the broadcast program reserved for recording is broadcast at the second broadcast station at a date and time different from that of the first broadcast station. In this case, the recording apparatus further comprises control means for changing a recording reservation date and time of the broadcast program stored in the memory to a date and time at which the broadcast program reserved for recording is broadcast on the second broadcasting station.

  According to the present invention, when a broadcast program reserved for recording at the second broadcast station is performed at a date and time different from that of the first broadcast station, the broadcast program reserved for recording at the date and time of the recording reservation is broadcast at the second broadcast station. The user can record the desired program without changing the recording reservation. Therefore, even when the broadcast date of the broadcast program changes at the destination, the user can view the desired broadcast program.

  In the above configuration, the present invention may further be configured to change a recording reservation date / time of a broadcast program stored in the memory to a date / time at which the recording reserved broadcast program is broadcast on the second broadcasting station. And a display means for displaying the date and time after the change. According to the present invention, the user can be notified of the date and time after the recording reservation is changed.

The broadcast program display method of the present invention, the broadcast program display method comprising the step of displaying a broadcast program by receiving a digital broadcast, a storage step of storing program information of a plurality of broadcast stations, said plurality of broadcast stations A program guide table based on the program information, a step of selecting a broadcast program of the first broadcast station to be viewed from the program guide table, and a broadcast wave of the first broadcast station cannot be received. When a broadcast program of the first broadcast station to be viewed from the program guide table is selected in a region, program information of a second broadcast station that is an affiliated station of the first broadcast station is acquired. A determination step of determining whether the broadcast program to be viewed is broadcasted on the second broadcast station at a date and time different from that of the first broadcast station; and the broadcast program to be viewed is the second broadcast station. With the first broadcast station When it is broadcast on different date and time; and a notification step of notifying the date and time broadcast program the viewing is broadcast in the second broadcasting station.

  According to the present invention, when a program that a user intends to view in a mobile area cannot be viewed due to the program organization of the local station, it is determined on what day of the week when the program that the user intends to view in that area is broadcast. It can be known and recorded on a recording device at home without being confused, and the day of the week / time on which a desired program is broadcast can be reserved. Therefore, even when the broadcast date of the broadcast program changes at the destination, the user can view the desired broadcast program.

The broadcast program recording method of the present invention is a broadcast program recording method comprising a step of receiving a digital broadcast and recording the broadcast program, wherein a recording reservation date and time of the broadcast program broadcast by the first broadcasting station is set to a predetermined value. A storage step of storing in a memory, and when moving to an area where the broadcast waves of the first broadcast station cannot be received, program information of a second broadcast station that is an affiliated station of the first broadcast station is acquired. It is determined whether or not the broadcast program reserved for recording is broadcast at the second broadcast station at a date and time different from that of the first broadcast station, and the broadcast program reserved for recording is determined as the second broadcast station. When the broadcast program is broadcast at a date and time different from that of the first broadcast station, the broadcast program that has been reserved for recording the broadcast program stored in the memory is broadcast at the second broadcast station. Having a step to change the day and time Broadcast program recording method according to symptoms.

  According to the present invention, when the broadcast program reserved for recording at the second broadcast station is performed at a date and time different from that of the first broadcast station, the broadcast program reserved for recording at the date and time of recording reservation is the second broadcast station. Since it was changed to the date and time broadcasted on, there is no need to change the recording reservation.

  In the above configuration, the present invention may further be configured to change a recording reservation date / time of a broadcast program stored in the memory to a date / time at which the recording reserved broadcast program is broadcast on the second broadcasting station. And a step of displaying the changed date and time on a predetermined display means. According to the present invention, the date and time after the change can be notified to the user.

  According to the present invention, a digital broadcast receiving apparatus, a broadcast program display method, and a broadcast that allow a user to view a desired broadcast program even when the broadcast date of the broadcast program changes at a destination without providing a server for generating EPG information. A program recording method can be provided.

  Hereinafter, the best mode for carrying out the present invention will be described.

  FIG. 1 is a diagram for explaining the outline of a digital broadcast receiving apparatus according to this embodiment. Symbol A is the first broadcasting station, B is the second broadcasting station, (a) is the first area where the broadcasting waves of the first broadcasting station A can be received, and (b) is the broadcasting of the second broadcasting station B. Each of the second regions where waves can be received is shown. In the second area (b), the broadcast wave of the first broadcasting station A cannot be received. In the first embodiment, when the digital broadcast receiving apparatus 1 moves from the first area (a) to the second area (b), the program that the user wants to view is organized by the program of the second broadcasting station B. When the program cannot be viewed due to the circumstances, it is possible to know what day of the week and what time of the program that the user intends to view in the second area (b) is broadcast.

  FIG. 2 is a block diagram of the digital broadcast receiving apparatus according to the present embodiment. As shown in FIG. 2, the digital broadcast receiver 1 includes a receiving antenna 2, an RF signal demodulator 3, a baseband signal demodulator 4, a data separator 5, a controller 6, an audio signal decoder 7, and a video signal decoder. 8, an amplifier 9, a speaker 10, an image composition unit 11, a display unit 12, an operation unit 13, a reception data memory 14, a clock 15, and a recording reservation memory 16.

  The digital broadcast receiving apparatus 1 receives a digital broadcast, is mounted on, for example, an automobile, and is used by being moved from a first area (a) to a second area (b). The receiving antenna 2 receives a digital broadcast from the ground or a digital broadcast from a satellite.

  The RF signal demodulator 3 includes a high frequency amplifier circuit 31, a frequency converter circuit 32, an intermediate frequency amplifier circuit 33, and the like, and extracts desired reception channel information from the digital broadcast signal received by the reception antenna 2. The high frequency amplifier circuit 31 performs high frequency amplification on the digital broadcast signal received by the receiving antenna 2 and outputs the amplified broadcast signal. The frequency conversion circuit 32 outputs the intermediate frequency signal obtained by converting the frequency of the broadcast signal by mixing the amplified broadcast signal output from the high frequency amplifier circuit 31 and the oscillation signal of a predetermined frequency. The intermediate frequency amplification circuit 33 amplifies the intermediate frequency signal output from the frequency conversion circuit 32 and performs a tuning operation.

  The baseband signal demodulation unit 4 includes a signal demodulation circuit 41, an error correction circuit 42, and the like. The signal demodulation circuit 41 converts the signal output from the RF signal demodulation unit 3 into digital data, and then performs a predetermined demodulation process. The error correction circuit 42 restores channel data including a plurality of channel information by performing predetermined error correction processing on the reception data output from the signal demodulation circuit.

  The data separation unit 5 takes out a packet signal carrying the broadcast program and its accompanying information from the channel data output from the baseband signal demodulation unit 4, and obtains audio data, video data, information data (program name, program name) Contents, program start time, program end time, category, performer, EPG data including program information such as song name, and affiliated station information are included). In terrestrial digital TV broadcasting, program information and series information about one week ahead are superimposed on the broadcast wave.

  The control unit 6 performs various processes while controlling the entire digital broadcast receiving apparatus. The audio signal decoding unit 7 performs predetermined decoding processing on the audio data output from the data separation unit 5, and generates and outputs a PCM (Pulse Code Modulation) audio signal, for example. This PCM audio signal is amplified by the amplifier 9 at a predetermined amplification factor and output from the speaker 10. The video signal decoding unit 8 performs a predetermined decoding process on the video data output from the data separation unit 5, and generates and outputs, for example, an NTSC (National Television System Committee) video signal. The NTSC video signal is combined with text data or the like by the image combining unit 11 and then output to the display unit 12.

  The display unit 12 displays a predetermined image. For example, a broadcast program whose recording reservation date and time is stored in the recording reservation memory 16 is broadcast by the second broadcasting station B. When changing the date and time, the date and time after the change is displayed. The operation unit 13 includes, for example, various keys for performing a channel switching operation, a recording reservation operation, an operation for selecting a desired broadcast program with reference to an electronic program guide, and the like.

  The reception data memory 14 stores EPG data in the information data separated by the data separation unit 5. The reception data memory 14 stores program information of the first broadcasting station A and program information of the second broadcasting station B. The clock 15 measures the current time. The recording reservation memory 16 stores information related to the recording reservation of the broadcast program, and stores the date and time of recording reservation of the broadcast program broadcast on the first broadcasting station A, for example. Note that the storage means, creation means, selection means, control means, memory, and display means in the claims are the received data memory 14, the control part 6, the operation part 13, the control part 6, the recording reservation memory 16, and the display part 12, respectively. Corresponding to

  Next, the operation of the digital broadcast receiving apparatus 1 will be described. FIG. 3 is an operation flowchart of the digital broadcast receiving apparatus according to the present embodiment. In step S11, the program information of each receivable station in the first area (a) where the digital broadcast receiving apparatus 1 is mainly used is acquired. That is, the RF signal demodulator 3 of the digital broadcast receiver 1 extracts desired reception channel information from the terrestrial digital broadcast signal received by the receiving antenna 2, and the baseband signal demodulator 4 performs demodulation processing and predetermined error correction. Processing is performed to restore the channel data, the data separation unit 5 separates EPG data containing program information from the reception channel information, and the control unit 6 records the EPG data in the reception data memory 14.

  In step S12, the digital broadcast receiving apparatus 1 moves from the first area (a) to the second area (b). The control unit 6 creates a program guide table based on the program information of the first broadcasting station A in response to a user request, and displays the program guide table on the display unit 12 via the image composition unit 11. FIG. 4 is a diagram showing a Monday program guide table based on the first broadcasting station A. FIG. The user operates the operation unit 13 to select a broadcasting station of the A TV series in order to view “A TV drama on Monday 9 o'clock” while viewing the program guide table on Monday as shown in FIG. .

  In step S13, the RF signal demodulator 3 of the digital broadcast receiver 1 extracts desired reception channel information from the terrestrial digital broadcast signal received by the receiving antenna 2, and the baseband signal demodulator 4 performs demodulation processing, An error correction process is performed to restore the channel data, and the data separation unit 5 can separate the EPG data containing the program information from the received channel information and acquire the received program name information of the second broadcasting station B. .

  In step S14, the control unit 6 refers to the EPG data stored in the reception data memory 14, and the acquired program name is the program name of the affiliated station at the same time (the program name of the drama at 9 am on A TV). To determine if it matches. If the control unit 6 determines in step S14 that the acquired program name matches the program name of the affiliated station at the same time (the program name of the drama at 9 am on TV A), the process ends.

  For this reason, the audio data separated by the data separation unit 5 is decoded by the audio signal decoding unit 7, the decoded audio data is amplified by the amplifier 9, and the amplified audio data is output as sound from the speaker. . The video data separated by the data separation unit 5 is decoded by the video signal decoding unit 8, and the decoded video signal is displayed on the display unit 12 via the image synthesis unit 11. As a result, the user can view “A TV drama on Monday at 9 o'clock” as usual.

  If the control unit 6 determines in step S14 that the acquired program name does not match the program name of the affiliated station at the same time (program name of the drama at 9 am on A TV), the control unit 6 proceeds to step S5 and proceeds to step S5. 6, a broadcast program “A TV drama on Monday at 9:00” that is viewed with reference to EPG data (program information of the second broadcast station B) stored in the reception data memory 14 is the second broadcast station B. Judge whether or not to be broadcast on.

  In step S15, when the control unit 6 determines that the broadcast program “A TV drama on Monday at 9 o'clock” is broadcast on the second broadcast station B, the control unit 6 proceeds to step S16 to view the broadcast program “A The date and time when the TV drama on Monday at 9:00 is broadcast on the second broadcasting station B is notified via the speaker and the display unit 12.

  FIG. 5 is a diagram showing a display example of the broadcast date and time of the moved program. The user can know the destination of the broadcast program to be viewed by viewing the display as shown in FIG. 5 "A TV drama from 9 am on Monday will be broadcast from 9 am on Tuesday in this region." . For this reason, it is possible to record on a recording device at home without confusion and to reserve the day of the week / time on which a desired program is broadcast.

  In step S15, when the control unit 6 determines that the broadcast program “A TV drama on Monday 9 o'clock” to be viewed in this area is not broadcast, the control unit 6 proceeds to step S7, and the broadcast program “ Information indicating that “A TV drama on Monday at 9 am” is not broadcast is output to the image composition unit 11. FIG. 6 is a display example when the broadcast program “A TV drama on Monday at 9:00” is not broadcast. The user can give a recording instruction or the like to the home by looking at a display as shown in FIG. 6 "A TV drama on Monday at 9:00 is not broadcast in this area."

  As described above, according to this embodiment, even when the broadcast program to be viewed cannot be viewed due to the program organization of the second broadcast station B, what time of day is the broadcast program to be viewed in the second region (b). It is possible to know whether the program is to be broadcasted, so that it is possible to record on a recording device at home without confusion and to reserve the day of the week / time at which a desired program is broadcast.

  Next, a second embodiment will be described. Since the digital broadcast receiving apparatus according to the second embodiment has the same configuration as the digital broadcast receiving apparatus according to the first embodiment, description will be made using the digital broadcast receiving apparatus 1 described in the first embodiment. FIG. 6 is an operation flowchart of the digital broadcast receiving apparatus according to the second embodiment. In step S21, the digital broadcast receiving apparatus 1 accepts a recording reservation for a broadcast program of the first broadcasting station A in the first area (a).

  That is, the control unit 6 reads out the program information of the first broadcasting station A stored in the reception data memory 14, creates a program guide table, outputs the program guide table, and outputs the program guide of the first broadcasting station A. The guide table is displayed on the display unit 12. The user operates the operation unit 13 while viewing the program guide table of the first broadcasting station A displayed on the display unit 12 to make a recording reservation for the target broadcast program. The control unit 6 stores in the recording reservation memory 16 setting values including the date and time of recording reservation for the target broadcast program.

  In step S22, the digital broadcast receiving apparatus 1 moves from the first area (a) to the second area (b) where the broadcast wave of the first broadcasting station A cannot be received along with the movement of the automobile or the like. In step S23, the digital broadcast receiving apparatus 1 acquires the program information of the second broadcasting station B in the second region (b). That is, the RF signal demodulator 3 of the digital broadcast receiver 1 extracts desired reception channel information from the terrestrial digital broadcast signal received by the receiving antenna 2, and the baseband signal demodulator 4 performs demodulation processing and predetermined error correction. The processing is performed to restore the channel data, the data separation unit 5 separates the EPG data of the second broadcasting station B having the program information from the received channel information, and the control unit 6 receives the EPG data of the broadcasting station B. Record in the data memory 14.

  In step S24, the control unit 6 refers to the program information of the second broadcasting station B, and even if the broadcast wave from the second broadcasting station B is received and recording is performed, the content of the recording reservation is not changed. If it is determined that there is no change in the contents of the recording reservation, the processing is terminated. Thereby, the target broadcast program can be recorded with the previously reserved recording.

  In step S24, when the recording reservation needs to be changed, the control unit 6 proceeds to step S25, and the control unit 6 has made a recording reservation with reference to the EPG data of the second broadcasting station B in the reception data memory 14. It is determined whether or not the broadcast program is broadcast at the second broadcast station B at a date and time different from that of the first broadcast station A, and the broadcast program reserved for recording is recorded at the second broadcast station B at the first broadcast station A. When the broadcast program is broadcast at a different date and time, the process proceeds to step S26, and the recording reservation date and time of the broadcast program stored in the recording reservation memory 16 is set to the date and time when the broadcast program reserved for recording is broadcast at the second broadcasting station B. change. In step S25, when the control unit 6 determines that the broadcast program reserved for recording is not broadcast, in step S27, the control unit 6 informs the user that there is no broadcast in the current region via the image composition unit 11 and the display unit 12. To finish the process.

  According to the second embodiment, when the broadcast program reserved for recording at the second broadcast station B is performed at a different date and time from the first broadcast station A, the broadcast program reserved for recording the recording reservation date and time is the second. Since the date and time are broadcast on the broadcasting station B, the user can record the desired program without changing the recording reservation. Therefore, even when the broadcast date of the broadcast program changes at the destination, the user can view the desired broadcast program.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims.・ Change is possible. For example, although the above embodiment has been described with reference to television broadcasting as an example, the present invention is not limited to this and can be applied to radio broadcasting.

It is a figure for demonstrating the outline of the digital broadcast receiver of a present Example. 1 is a block diagram of a digital broadcast receiver according to an embodiment. It is an operation | movement flowchart of the digital broadcast receiver which concerns on 1st Example. It is a figure which shows the program guide table | surface of Monday based on the 1st broadcasting station A. FIG. It is a figure which shows the example of a display of the broadcast date and time of the moved broadcast program. It is a figure which shows the example of a display which shows that a program "Drama of Monday of 9 A on TV is not broadcast." It is an operation | movement flowchart of the digital broadcast receiver which concerns on 2nd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Digital broadcast receiver 2 Receiving antenna 3 RF signal demodulation part 4 Baseband signal demodulation part 5 Data separation part 6 Control part 16 Recording reservation memory

Claims (6)

In a digital broadcast receiver for receiving digital broadcasts,
Storage means for storing program information of a plurality of broadcasting stations;
Creating means for creating a program guide table based on program information of the plurality of broadcasting stations;
Selecting means for selecting a broadcast program of the first broadcast station to be viewed from the program guide table;
When the broadcast program of the first broadcast station to be viewed from the program guide table is selected from the program guide table in an area where the broadcast wave of the first broadcast station cannot be received by the selection means, the first broadcast station Control for acquiring program information of a second broadcasting station which is an affiliated station and determining whether or not the broadcast program to be viewed is broadcasted on the second broadcasting station at a date and time different from that of the first broadcasting station Means,
When the broadcast program to be viewed is broadcasted at the second broadcast station at a date and time different from that of the first broadcast station, a notification for notifying the date and time when the broadcast program to be viewed is broadcast at the second broadcast station Means for receiving a digital broadcast. In a digital broadcast receiver for receiving digital broadcasts,
A memory for storing the recording reservation date and time of a broadcast program broadcast on the first broadcasting station;
When moving to an area where the broadcast wave of the first broadcast station cannot be received, program information of a second broadcast station that is an affiliated station of the first broadcast station is acquired and the broadcast program reserved for recording is It is determined whether or not the second broadcast station broadcasts at a date and time different from that of the first broadcast station, and the broadcast program reserved for recording is the second broadcast station and the first broadcast station. Control means for changing the recording reservation date and time of the broadcast program stored in the memory to the date and time when the broadcast program reserved for recording is broadcast on the second broadcasting station when broadcast at a different date and time. A digital broadcast receiver characterized by the above. The digital broadcast receiving apparatus may further change the recording reservation date and time of the broadcast program stored in the memory to a date and time when the recording program reserved for broadcasting is broadcast on the second broadcasting station. 3. The digital broadcast receiving apparatus according to claim 2, further comprising display means for displaying the date and time. In a broadcast program display method including a step of receiving a digital broadcast and displaying a broadcast program,
A storage step of storing program information of a plurality of broadcast stations;
Creating a program guide table based on program information of the plurality of broadcast stations;
Selecting a broadcast program of the first broadcast station to be viewed from the program guide table;
It is an affiliated station of the first broadcast station when a broadcast program of the first broadcast station to be viewed from the program guide table is selected in an area where the broadcast wave of the first broadcast station cannot be received. A determination step of determining whether or not the broadcast program to be viewed by acquiring program information of a second broadcast station is broadcast on the second broadcast station at a date and time different from that of the first broadcast station;
When the broadcast program to be viewed is broadcast on the second broadcast station at a date and time different from that of the first broadcast station, the date and time when the broadcast program to be viewed is broadcast on the second broadcast station is notified. A broadcast program display method comprising: a notification step. In a broadcast program recording method comprising a step of receiving a digital broadcast and recording a broadcast program,
A storage step of storing in a predetermined memory the date and time of recording reservation of a broadcast program broadcast on the first broadcasting station;
When moving to an area where the broadcast wave of the first broadcast station cannot be received, program information of the second broadcast station that is an affiliated station of the first broadcast station is acquired and the broadcast program reserved for recording is acquired. It is determined whether or not the second broadcast station broadcasts at a date and time different from that of the first broadcast station, and the broadcast program reserved for recording is transmitted to the first broadcast station at the second broadcast station. Changing the recording reservation date and time of the broadcast program stored in the memory to the date and time at which the broadcast program reserved for recording is broadcast on the second broadcasting station when broadcasting at a different date and time. A broadcast program recording method characterized by the above. In the broadcast program recording method, when the recording reservation date / time of the broadcast program stored in the memory is changed to the date / time at which the recording reserved broadcast program is broadcast by the second broadcasting station, 6. The broadcast program recording method according to claim 5, further comprising a step of displaying the date and time on a predetermined display means.

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