JPS6014585A - Character broadcasting receiver having program reservation function - Google Patents

Abstract

PURPOSE:To enable to see character broadcasting of designated program without waiting time even when the program is not reserved by detecting presence of reserved program stored in a memory and in case of absence, storing the number of program being sent out in above-mentioned memory. CONSTITUTION:A CPU6 makes a buffer memory 5 write data packet of each multiplex H period. If writing was completed, data of data discrimination codes DI1, DI2 in the buffer memory 5 are read out. When the data are program index packet, data in program buffer 8a are brought in from a working RAM8 to the CPU6. If the data are not reserved, program number of program index packet at that time is stored in a program memory 8b as a measure for waiting time. If reserved, coincidence with program number of program index packet is checked, and in case of coincidence, the data of the program buffer 8a are stored in the program memory 8b. If they do not coincide, program number of program index packet is stored in the program memory 8b.

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 by data buckets 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 There are times when a broadcast number does not exist, and in such cases there is still a waiting time and it is not possible to watch teletext immediately after specifying a program.

<Purpose> The present invention has been made in view of the above points, and provides a program reservation system that allows users to immediately watch teletext broadcasting even if they have not reserved a program or the reserved program does not exist. The present invention provides a teletext receiver with functions.

<Examples> The present invention will be described in detail below according to examples shown in the drawings.

Prior to describing this embodiment, a data packet for transmitting a teletext signal will be briefly described 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 square marks in the figure, the data packets have horizontal scanning line numbers from the 10th H to the 21st H, and the 273rd H.
to the 284th H period (hereinafter, this period will be referred to as a multiple H period). FIG. 2 is an enlarged view of the part indicated by the ward mark in FIG. 1, and shows the structure of the kerato. In FIG. 2, 100 is a horizontal synchronizing signal, 101 is a color code IIM number, 102 is a data part (kerato), 103 is a header part, and 104 is an information data part such as characters. There are various types: page control (keno) PCP, color coat bucket ccp, turn data nokkutsu) PDP, horizontal scroll data (kerato I (DP).

Program index packet PI F, Damino (Kerato DMP
has. Next, the meaning of each abbreviation shown in FIG. 2 will be explained. CR is called chrono clock in and is a synchronization signal for bit clock reproduction, FC is called framing code and is a byte synchronization (word synchronization) signal used to reproduce various codes 9, and 5Iid service identification code. DI is a code that specifies the type of broadcasting to be serviced by the relevant network, an interrupt control code is a code that identifies a unit of transmission, and DI is a data identification code, which is the data type of the information data section. This is a code that specifies.

There is a program number code indicating the channel of the Ushida PRf/1 teletext signal, which consists of a two-digit number, and the recipient can select a program by inputting this number. When PA consists of multiple pages for one teletext broadcast, the page number code is attached to each page, and the recipient can access the page by entering this number after the program number. You can choose. When displaying a teletext program, the EU uses a code that specifies whether to erase (clear) the display on the current page or start displaying it without erasing it, and the DC uses a code that specifies whether to display the page on TV. A display control code that indicates whether to scroll or not.
RBf-11, a code that specifies the background color of the display surface raster in full-scale fixed display and full-scale vertical scroll display, H!
3 is a code that specifies a lasco color corresponding to the upper part of the first row of all display sections, and PU is a code that stops scrolling in a one-line horizontal scroll display and notifies you when the sweet program content has been updated.

FIG. 3 shows one embodiment of the present invention, where 1 is a television antenna, and 2 is a standard television receiver that performs RF amplification, IF amplification, and detection of a television signal input from the television antenna 1. Sections 3 and 3 are ordinary television signal processing sections for signals processed by the receiving section 2 and output as composite video signals.

This is a character signal receiving section that performs processing such as slicing the television signal input from the 4Iri receiving section 2 into appropriate levels, shaping the waveform, and extracting a character signal. This character signal receiving section 4 further generates a clock synchronized with the character signal, and supplies the data packets, /) within the multiple H period to the buffer memory 5 whose address space is determined. (1) Data from SI/IN (service identification code/interrupt control code) of the data packet given from the character reception unit 4 is written into the memory 5. 6 is the entire circuit inside the receiver. The CPU that controls the operation (
7 is a program ROM (read-only memory) in which a program for instructing the operating state of the CPU 6 is stored in advance, and 8 is a working RAM (random access memory) used for the operation of the CPU 6. In this working RAM 8, 1 compares the program number S rough 78a in which the reserved program number is temporarily stored at the time of reservation, and this stored reserved program number with the table of contents of the program number currently being transmitted that is sent intermittently. A program memory 8b for storing the reserved program number when the reserved program number is included in the table of contents is built-in. 9
is a file in working RAM 8.

The memory 9 is a multi-memory that stores character image information corresponding to the reserved program number stored in the program memory 8b, and the memory 9 can store image information for a maximum of eight programs. Note that 1011-1: Data bus, 1lt
1-J near address bus, 121'', J, television signal/character signal switching circuit, 131-1CRT.

Next, the data processing operations of the buffer memory 5 and working RAM 8, which are related to the present invention, will be explained in detail with reference to the flowchart shown in FIG. First, CPU 6 if
Data packets within each multiplexed H period are written into the buffer memory 5. Then, check whether writing to the buffer memory 5 has been completed and do not process the data until all data has been written. If this writing has been completed, transfer the data with data identification codes DI+ and DI2 in the buffer memory 5 to the CPU 6. Read through data bus 10. Then, it is determined whether the data is a program index packet (PIF), and if it is a program index packet, the working RA is
The data in the program buffer 8a is transferred from M8 to the CPU 6.
and check whether the data is reserved. If the program is not reserved, the program number of the program index (PIP) at that time is stored in the program memory 8b in the working RAM 8 as a measure against waiting time.

If the program is reserved in advance, the program index packet (P
IP) to see if it matches the program number. If they match, the reserved program is set and the data in the program buffer 78a is stored in the program memory 8b. If there is still no match, all program numbers sent in the program index packet (PIF) are checked for matches. If they do not match, the program number of the program index packet (PIP) is stored in the program memory 8b as a waiting time.

Note that when a predetermined program number is stored in the program memory 8b in the working RAMB, character information, etc. corresponding to the program number is sequentially transferred from the buffer memory 5 to the multi-memory 9 based on instructions from the CPU 6, and is transferred to the memory 9 each time. The information within will be updated.

<Effects> 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. Since the program number being broadcast at that time is automatically stored in memory, even if the user has not reserved the program in advance, the specified program can be telecast with almost no waiting time. It becomes possible to see.

[Brief explanation of drawings]

Figures 1 (a) and (b) both show waveform diagrams of the television video signal, especially near the vertical retrace period, and Figure 2 is a partially enlarged view of Figure 1 and a configuration diagram of each data packet corresponding thereto. shows. FIG. 3 is a block diagram of one embodiment of the present invention, and FIG. 4 is a flowchart for operating the same embodiment. 1. Antenna, 2. Receiving section, 4. Character signal receiving section, 5. Buffer memory, 6.. C'P U. 7. Program memory, 8. Working RAM. 9...Multi memory, 8a...Program buffer 7.8
b ・Program memo 18

Claims (1)

[Claims] 1. In a teletext receiver having a memory for storing reserved program numbers and a program reservation function, a detection means for detecting the presence or absence of a reserved program stored in the memory, and a detection means for detecting the presence or absence of a reserved program stored in the memory by the detection means. A teletext receiver with a program reservation function, comprising means for storing a program number being transmitted in the memory when a reserved program is not detected.