JPS60146586A - Character broadcasting receiver with program reserving function - Google Patents

Abstract

PURPOSE:To see the character broadcast of a designated program nearly without waiting time by detecting previously whether there is a reserved program number in a memory or not and storing a program number in transmission in the memory automatically when there is no reserved program number. CONSTITUTION:A television signal obtained by a reception part 2 is applied to a data sampling circuit 8 to extract a waveform-shaped character signal. This character signal is converted by an S/P converter 22 and stored in temporary display memory 20. Then display data from display memories 20 and 21 are displayed on the screen of a CRT7 under the control of a display control circuit 24 as a substitute for a television signal from a signal processing part 3. Then, it is confirmed from a data identifying code in the buffer memory 20 whether the data indicates the reserved program broadcast or not; when not, the program number is stored in an RAM27 for a countermeasure to wait time. Then the contents of the RAM27 are transferred to a multiple memory 28 under the command of a CPU26 and information in the memory 28 is updated at every time.

Description

[Detailed Description of the Invention] [Technical Field] The present invention utilizes the vertical blanking period of a television video signal to receive character signals transmitted in data packets whose unit length is the horizontal scanning period. The present invention relates to a teletext receiver having a program reservation function, and particularly to a teletext receiver having a program reservation function.

<Prior art> In general, in teletext receivers, there is a waiting time of several seconds to several tens of seconds after the program is specified until the program arrives. It is convenient to keep it.

However, in conventional teletext receivers with a program reservation function, even if a program number is reserved at a certain broadcasting station, when the channel is changed to another broadcasting station, the program reserved at the previous broadcasting station is Sometimes there is no broadcast for that number, and in such cases there is still a waiting time and it is not possible to watch the teletext immediately after specifying the program.

The present invention has been made in view of these points, and it provides a program that allows users to immediately watch teletext even if they have not reserved the program or even if the reserved program does not exist. This provides a teletext receiver with a reservation function.

<Example> The present invention will be described in detail below according to an example shown in the drawings.

Prior to explaining this embodiment, a data packet for transmitting a teletext signal will be briefly explained with reference to FIGS. 1 and 2. FIG. 1 shows the vertical blanking period of a television video signal, with FIG. 1(a) showing the first field and FIG. 1(b) showing the next field. As shown by the marks in the figure, the data no kerat is between the horizontal scanning line numbers 10H and 21H, and the 273H.
to the 284th H (hereinafter, this period will be referred to as a multiple H period). FIG. 2 is an enlarged view of the portion indicated by the square mark in FIG. 1, and shows the configuration of the data noshiket. In FIG. 2, 100 is a horizontal synchronizing signal, 101 is a color burst signal, 102 is a data packet, 103 is a header section, and 104 is an information data section such as characters. Data Noku Kerato (d There are 6 types, page control packet PCP, color code packet CCP
, pattern data packet 1-FDP, horizontal scroll data packet I (DP, program index bucket) PIF, and dummy data packet I (DP) DMP. Next, the meaning of each abbreviation shown in FIG. 2 will be explained. CR is called a clock run-in and is a synchronization signal for bit clock reproduction. FC is called an framing code and is a byte synchronization (word synchronization) signal for reproducing various codes. SI is called a service identification code and is used to identify the relevant bit clock. A code that specifies the type of broadcast serviced by a packet. IN is called an interrupt control code and is a code that identifies one transmission unit. DI is called a data identification code and specifies the data type of the information data section. It is a sign.

The Ushida PR is a program number code indicating the channel of the teletext signal and consists of a two-digit number, and the recipient can select a program by inputting this number. When one teletext program consists of multiple pages, the PA is a page number code that reads the number on that page, and the recipient can access that page by inputting this number after the program number. You can choose. The EU specifies whether to erase (clear) the previous display or disclose the display without erasing when displaying a teletext program, and the DC specifies whether or not the page should be displayed as TV Super. Display control code indicating whether to scroll or not, RB
is a code that specifies the background color of the display surface in fixed display and full-scale vertical scroll display, HB is a code that specifies the color of the display surface above the first row of all display sections, and PU is in single-line horizontal scroll display. This is a code to stop scrolling and notify you when the program content has been updated.

FIG. 3 shows one embodiment of the present invention, where 1 is a television antenna, and 2 is a receiving section of a standard television receiver that performs RF amplification, IF amplification, and detection of a television signal input from the television antenna 1. , 3 is a normal television signal processing section for the signal processed by the receiving section 2 and outputted as a composite video signal. 4 is a switching circuit for switching between a television video signal obtained from the television signal processing section 3 and a character signal obtained from a character signal reception processing section 5, which will be described later; 6 is a CRT drive circuit; and 7 is a CRT (cathode ray tube).
It is.

Here, the character signal reception processing section 5 includes a data extraction circuit 8, a bit synchronization circuit 9, an FC signal detection circuit lO1 synchronization signal generator 11, a clock pulse generator 12, and a display control circuit 13.
, data write control circuit 14, column counter 15, row counter 16, color address control circuit 17, multiplexers 18, 19, display memory (pattern memory and buffer memory) 20, display memory (color memory) 21,
Serial/parallel converter 22, parallel/serial converter 23, display control circuit 24, CPU (central processing unit 39-processing unit) 25, program ROM 26, work RAM 2
7.8 screen multi-memory 28, remote control printer 11
0 circuit 29, a remote control receiver 30, and a line preset circuit 31.

32 represents a data bus, and 33 represents an address bus.

Next, to explain the operation of the character signal receiving section 5, the television signal obtained from the zuzu receiving section 2 is applied to the data extraction circuit 8, where it is sliced to an appropriate level and waveform shaped, and the character signal is extracted. It will be done. The character signal extracted by the circuit 8 is converted from a serial signal to a parallel signal by a serial/parallel converter 22, and then temporarily stored in a buffer memory in a part of the display memory 20. At this time, since it is necessary to synchronize the character signal with the converter 22, the bit synchronization circuit 9 and the FC signal detection circuit 10 perform synchronization on a bit-by-bit and byte-by-byte basis.

After the multiple H period ends, the character signal stored in the buffer memory is decoded by the KCPU 25 to determine the type of data packet based on the data identification codes DII and DI2 in the data packet shown in FIG.
It is stored in the screen multi-memory 28. Display memory 20.
The display data stored in 21 is read out according to the addresses of column counter 15 and row counter 16 during the display period, is controlled by display control circuit 24, and is output to switching circuit 4. At this time, the television signal processing section 3
Instead of the television video signal obtained from the above, the signal is supplied to the CRT drive circuit 6 and displayed on the screen of the CRT 7.

Next, the data processing operations of the display memory () < buffer memory) 20 and the work RAM 27, which are related to the present invention, will be explained in detail along with the flowchart shown in FIG.
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, , , , , jS-119!11 is made to write the data packet in each multiplex H period. Then, it is confirmed whether writing to the buffer 1 memory 20 is completed, and data processing is not performed until all the writing is completed. If this writing has been completed, the data identification code Dh in the buffer memory 20.

The data in DI2 is read out to the CPU 25 through the data node 32. And that data is in the program index) (
PIF), and if it is the program index, the program buffer data stored in the work RAM 27 is read into the CPU 25, and it is checked whether the data is reserved. If the program is not reserved, the program number of the program index (PIF) at that time is stored in the program memory in the work RAM 27 as a measure against the 1ri waiting time. If it has been reserved in advance, the program number in the program index packet I-(F)IP) is checked. If they match, the reserved program is set and the data in the program buffer is stored in the program memory.

If there is no match, please use the program index (PIF)
Check for matches with all program numbers being sent out. If they do not match, the program index will be used as a waiting time)
(PIF) program number is stored in the program memory.

Note that when a predetermined program number is stored in the program memory in the work RAM 27 in this way, character information, etc. corresponding to the program number is sequentially transferred from the buffer memory 20 to the multi-memory 28 based on instructions from the CPU 26, and is stored in the memory 28 each time. The information within will be updated.

Next, the operation when calling a program will be explained with reference to the flowchart shown in FIG.

First, the CPU 25 selects the specified program (program index page).
Check whether it matches the program number of (PIP). And if there is no match, program index Paken) (PIF)
Look for matches with all program numbers being sent out on K. If all of the programs do not match, it means that the specified program is not being transmitted, and a message "Not being transmitted" is displayed on the screen of the CRT7 as shown in Figure 7.If only one matches, then checks whether the program is reserved in the work RAM 27. If the program is not reserved, the specified program is sent out on the CRT screen as shown in Figure 6. Displays the message "Please wait". specified.

If a program has been reserved, it is further checked whether data of that program is stored in the multi-memory 28. If program data is stored in the multi-memory 28, the data is stored in the display memory 20.21 and CJ%
Display on the T screen. If no data is stored in the multi-memory 28 (-i), the message ``Please wait'' is displayed on the CRT screen as shown in FIG. 6 until the specified program is about to be sent out.

<Effect> As described above, according to the present invention, in a teletext receiver having a program reservation function, it is detected whether or not there is a program number reserved in advance in the memory, and if there is no reserved program number. At that time, the number of the program being broadcast is automatically stored in memory, so even if the user has not reserved the program in advance, the characters of the specified program will be displayed with almost no waiting time. It is possible to watch broadcasts.

[Brief explanation of the drawing]

Figures 1 (a) and (b) both show waveform diagrams of the television video signal, especially near the vertical retrace period. Figure 2 is a partially enlarged view of Figure 1 and the corresponding structure of each tape. Show the diagram. FIG. 3 is a block diagram of an embodiment of the present invention, FIGS. 4 and 5 are flowcharts for operating the embodiment, and FIGS. 6 and 7 are CRT displays for explaining the operation of the embodiment. It is a figure showing a pattern. 3... Television signal processing unit, 5 Character signal reception processing circuit, 20.21... Display memory, 25... CP
U, 26 program ROM, 27...work RAM
, 28...Multi memory. Agent Patent Attorney Aihiko Fuku (and 2 others) Figure 4; Figure 5

Claims (1)

[Scope of Claims] l In a teletext receiver having a program reservation function, which includes a work memory that stores a reserved program number and a data memory that stores data of the reserved program, the reserved program stored in the work memory detection means for detecting the presence or absence of the
means for storing a program number being transmitted in the work memory when the detection means does not detect a reserved program stored in the work memory; and a reserved program stored in the work memory by the detection means. A character with a program reservation function, characterized in that the character is provided with means for detecting whether or not a reserved program is being transmitted, and storing the number of the program being transmitted in the work memory when the reserved program does not exist at the transmission number. Broadcast receiver. 2. In a teletext receiver having a program reservation function that includes a work memory for storing reserved program numbers and a data memory for storing reserved program data, detecting the presence or absence of a reserved program stored in the work memory. detection means;
means for storing a program number being transmitted in the work memory when the detection means does not detect a reserved program stored in the work memory; and a reserved program stored in the work memory by the detection means. means for detecting whether or not a reserved program is being transmitted, and storing the program number being transmitted in the work memory if the reserved program is not present in the reserved program or the transmitted program; and receiving (calling) a teletext program.
a broadcast program detecting means for detecting a match between the program number specified at the time and the program number currently being broadcast; and reserved program detecting means for detecting a match between the designated program number and the reserved program number stored in the work memory when the transmitted program detecting means detects that the designated program is among the broadcast programs. and means for reading out data in the data memory and displaying it on a screen when the detection means detects a match between the reserved program numbers, and when the reserved program detection circuit fails to detect a match with the reserved program numbers. , and means for displaying the message on a screen. 1. A teletext receiver with a program reservation function.