JPH04108284A - Broadcast receiver - Google Patents

Abstract

PURPOSE:To effectively utilize information on the current date and time included in one packet 8/30 by fetching the packet 8/30 being one of broadcasting service data packets(BSDP) and analyzing the data on the current date and time, and setting a time piece provided to a broadcast receiver main body according to the analyzed data. CONSTITUTION:A teletext decoder 7 writes the data of the received BSDP packet 8/30 in a screen memory 9. The data of the BSDP packet 8/30 received once the fetch of the data of the BSDP packet 8/30 is completed are read in the internal memory of a control part 6 from the screen memory 9 and the current time data is analyzed. Further, it is checked whether or not the analyzed current time data includes an error and when not, the analyzed current time data is sent to a VTR control part 13, which sets the time piece 15 of a VTR according to the current time data. Consequently, the current date and time data included in the BSDP packet 8/30 are effectively utilized to set the time piece of the VTR main body.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a broadcast receiver such as a video tape recorder (VTR) capable of receiving teletext broadcasts, and particularly to a broadcast receiver such as a video tape recorder (VTR) capable of receiving teletext broadcasts, and in particular to FLOF, which is a teletext broadcast system in the UK. (
Full Level One Features) page inspection and broadcast service data packet
(BSDP: Broadcast 5 service
The present invention relates to a broadcast receiver such as a video tape recorder that can input a single data packet (Data Packet).

(b) Conventional technology In the UK, FLOF (Full Level One
Teletext broadcasting is carried out using a broadcasting system called Fea-tures.

This system allows broadcasters to display BSDP (Broadcast Protocol) information that is not actually displayed on the screen called Ghost Row, in addition to the regular teletext display page.
ast 5service Data Packet)
(broadcast service data packet), and this BSDP called ghost row contains initial page information (packet 8/30), link page information (packet X/27), link There is page title information (bucket) X/24), etc. VTR
The teletext decoder in the computer takes in the BSDP, analyzes it, and performs page analysis and display according to the BSDP information.

(c) Problems to be solved by the invention By the way, among the above BSDP packets, packet 8/30 (initial page packet) is sent from the broadcasting station once every second, and this packet also contains an initial page packet. In addition to this information, information indicating the current date and time is included.

However, conventionally, the initial of packet 8/30
Page information was used, but information representing the current date and time was not used.

Therefore, the present invention attempts to effectively utilize the current date and time information contained in packet 8/30.

(d) Means for Solving the Problems The present invention is capable of capturing teletext data superimposed on the vertical blanking period of a television video signal, and also enables FLOF (Full Level
It is possible to search pages by one feature (One Feature), and multiple types of broadcast service data packets (BSDP: Broadcast 5 service) by FLOF are available.
In order to solve the above problems in broadcast receivers that can capture BSDP
bucket) 8730 (initial page
packet), the data of the current date and time contained in the data of the packet is analyzed, and the clock provided in the main body of the broadcast receiver can be set using the analyzed data.

(e) Effect: According to the above means, the current date and time data included in the BSDP packet) 8/30 (initial page packet) is effectively used to easily and accurately set the time of the clock of a broadcast receiver such as a VTR. I can do it.

(F) Example An example of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 shows a schematic block diagram of a VTR embodying the present invention, in which a broadcast signal captured by an antenna (1) is selected for reception by a tuner (2), and a video intermediate frequency and detection circuit [IF-DET ] (3), the signal is processed by the video signal processing circuit (4), and is supplied to the display signal switching circuit (5). This display signal switching circuit (5) switches between the video signal (b) from the video signal processing circuit (4) or the teletext decoder in response to a switching signal (a) from a teletext control section (6) constituted by a microcomputer. The character signal from (7) or the composite signal (c) of the character signal and video signal is selected and output.

On the other hand, among the video signals obtained from the IF-DET (3), the teletext signal multiplexed during the vertical retrace (blanking) period is extracted by the teletext signal extraction circuit (8) and then extracted by the teletext decoder (7). ). This teletext decoder (7) extracts only the data of the page number instructed by the teletext control section (6) and supplies it to the screen memory (9). Screen memory (9)
The screen data of the specific page number selected by the teletext decoder (7) is sent to the teletext control unit (6).
Write according to control signals from. The screen memory (9
) is read out in accordance with a control signal from a teletext control section (6), and then converted into a character signal by a teletext decoder (7).

The teletext control unit (6) controls the display of the television screen and the teletext screen by sending commands to the teletext decoder (7) and the display signal switching circuit (5) as described above, and also controls the display of the TV screen and the teletext screen directly. ) can also be used to display arbitrary characters.

In addition, a remote control transmitter (10) and a VTR
An input signal input by operating a keyboard (11) provided on the main body is converted into a common code signal by an input control section (12), and then input to a VTR control section (13). This VTR control section (13) performs timer reservation and clock (
15), and controls the channel selection circuit (14) to select a channel, perform various VTR operations such as playback, fast forward, rewind, and stop, and make program recording reservations. The control code is supplied to the teletext control (6).

Next, while referring to the flowcharts in FIGS. 1 and 2, the BSDP is started by operating the remote control transmitter (10) or the keyboard (11) provided on the VTR body.
The operation of the teletext control unit (6) for setting the clock using the current date and time data included in packet 8/30 (initial page packet) will be described in detail.

The teletext control section (6) is always waiting for input information from the remote control transmitter (10) or the keyboard (11) provided on the VTR body to be sent from the VTR control section (13). (Step ■), the corresponding VT
When the key human power information is received from the R control section (13), the process proceeds to step (2). In step ■, the contents of the input key code are checked, and if it is for setting the clock using the current date and time data included in the BSDP packet 8/30 (clock setting key on the operation panel), proceed to step ■. . In step ■, the teletext decoder (7)
Instructs to import BSDP packet 8/30,
The teletext decoder (7) writes the data of the captured BSDP packet 8/30 into the screen memory (9).

In step (2), the process waits for the completion of data capture of BSDP packet 8/30, and then proceeds to step (2). In step ■, the captured BSDP packet 8/30 data is
The current time data is analyzed by reading it from the screen memory (9) into the internal memory of the control unit (6). In step (2), it is checked whether there are any errors in the analyzed current time data, and if there are no errors, the process proceeds to step (2). In step (2), the analyzed current time data is sent to the VTR control section (13), and the VTR control section (13) sets the clock (15) of the VTR in accordance with the current time data.

Here, the operation of the teletext control unit (6) in analyzing the current time data of BSDP packet 8/30 will be explained in more detail with reference to FIGS. 3 to 5.

FIG. 5 shows the data structure of BSDP packet 8/30 arranged in one horizontal period of the vertical blanking period, and FIG. 3 shows the specifications of the current time data of this BSDP packet 8/30. The current time data is rT.
ime 0ffset Code (T.

C) J, rModified Julian Date
(MJD)” and r Co-rdinatedυn1v
ersal Time (UTC), which is rWorld System Teletext
Technical Specification.

In Figure 3, TOC is used to indicate how much the transmission date and time must be shifted due to local time or summer time, and LBS and MSB are 1
2-1 is fixed to 3, and explaining each bit, 2-1 is 3
0 minutes, 2° is 1 hour, 21 is 2 hours, 2! is 4 hours, 2
3 indicates 8 hours as the maximum value. Also, 0 (=positive) indicates the direction of offset for the customer.
Or 1 (=negative) is entered, and as a result, the offset time can be corrected by up to ±15 hours in units of 30 minutes.

Also, in MJD, from the right, 0.10.100°1
000, 10000 (1 on the left is fixed data), January 31, 1982 is the reference point, and this reference point is 4
It is expressed in BCD of 5000, and each day this 45
Increment +1 to 000. Note that each digit of this MJD is incremented by +1 for reasons of transmission. Furthermore, in UTC, seconds, minutes, and hours are each expressed in 2-digit BCD, and this is also represented by +1 for all digits for reasons of transmission.
has been done. Now, in step (2), it is checked whether the TOC is in error, and if there is no error, the process proceeds to step (2). In step (2), it is checked whether MJD and UTC are in error, and if there is no error, the process proceeds to step (2). In step (2), the current date is calculated from the MJD data. In step (2), UTC is adjusted using TOC data. In step ■, the UTC adjusted in step ■ is 0.
Check whether it is before 0:00 (if it is the previous day's time), and if it is before 0:00 (if it is the previous day's time), proceed to step ■. In step ■, the current date is subtracted by 18. If UTC is not before 0:00 in step (2) (if it is not the previous day's time), proceed to step (2). In step (2), it is checked whether the UTC adjusted in step (2) is after 24:00 (C: the time of the next day), and if it is after 24:00 (if it is the time of the next day), proceed to step (2). In step ■, the current date is increased by 16.

Through the above series of operations, by operating one key on the remote control transmitter, etc., it is possible to set the clock on the video tape recorder using the current date and time data of 8/30 (B SDP bucket). .

(G) Effects of the Invention As described above, according to the present invention, the BSDP packet 8/
By effectively utilizing the current date and time data included in 30 (initial page packet), you can easily and accurately
This has the effect of allowing you to set the clock on the TR itself.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the main part of a video cheap recorder implementing the present invention, Fig. 2 is a flowchart for explaining its operation, and Fig. 3 is a specification of current time data of BSDP packet 8/30. FIG. 4 is a flowchart for analyzing the current time data of BSDP packet 8/30, and FIG. 5 is a diagram showing the data structure of BSDP packet 8/30 arranged in one horizontal period of the vertical blanking period. It is a diagram. (7)...Teletext decoder, (8)...Teletext extraction circuit.

Claims (1)

[Claims] (1) It is possible to capture teletext data superimposed on the vertical blanking period of a television video signal, and it is also possible to capture teletext data superimposed on the vertical blanking period of a television video signal.
It is possible to search the page by the FLO
Multiple types of broadcast service data packets (BS
DP:BroadcastServiceDataPa
A broadcasting receiver capable of capturing packet 8/30 (Initial Page Packet), which is one of the BSDPs mentioned above, is captured in a broadcast receiver capable of capturing CKE-T), and the current date and time data included in the data of the packet is analyzed. A broadcast receiver characterized in that a clock provided in a main body of the broadcast receiver can be set based on the analyzed data.