JPH0473916B2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention is a teletext receiver that stores all pages of all teletext programs sent on the same channel using as little memory as possible. It is related to.

``Prior Art'' The number of programs in text broadcasts sent to the vertical retracing system of TV signals differs depending on the broadcasting station, and the number of pages also differs depending on the program even on the same channel. Specifically, in the Kanto area, there are 109 programs on channel 1, 57 programs on channel 4, 53 programs on channel 6, 16 programs on channel 8, and 109 programs on channel 10.
59 programs, 12th channel has 59 programs. Also, the 1st channel
The 109 programs range from 2-page programs to 27-page programs, but if you want to memorize every page of every program, you will have to
27 pages x 109 programs = 2943KB (kilobytes) is required. However, the memory capacity required for one page varies depending on the graphics, characters, etc., but the average is 1KB. Theoretically, a program with a small number of pages can require a small memory capacity, but since a teletext signal is sent with a plurality of programs mixed on each page, it is necessary to use the maximum page as a reference. For example, program A has 2 pages (A1,
A2), the B program has 3 pages (B1, B2, B3), and the C program has 1 page (C1), then the teletext signal is A1,
They are sent in the order of B1, C1, A2, B2, C1, A1, B3, C1. In order to store all pages of these three programs, 2+3+1=6 KB would be sufficient if the same page of the same program is not stored. However, since teletext signals are updated at appropriate times, signals that are repeatedly input must be constantly updated and stored. Therefore, to store all programs A, B, and C above, maximum page 3 x total program 3 =
9KB is required. Therefore, in order to store as many programs as possible with as little memory capacity as possible, conventional methods used to store, for example, 10 programs for 30 pages and 60 programs for 10 pages.
A method has been proposed in which the internal memory is allocated in advance, such as 4 pages for 20 programs, and the number of pages is checked in advance and specific programs are preset according to the size of the capacity. There is.

``Problems to be Solved by the Invention'' As described above, the method of presetting all programs requires less memory capacity, but has the disadvantage that it is cumbersome to operate, and in particular, presetting for every channel is extremely troublesome. .

The problem of the present invention is to provide at least two memories, to store up to a certain number of pages in one memory without presetting all programs, and to preset and store only some programs with a large number of pages in the other memory. It's about doing.

"Means for Solving the Problems" The present invention provides a teletext receiver capable of storing all pages of all teletext programs in the same channel in a memory, in which the memory stores a certain number of pages of all teletext programs in the same channel. A first memory that stores up to the page, and a second memory that stores all pages for programs that exceed a certain number of pages.
The teletext receiver is characterized in that the first memory has a capacity capable of storing 80% or more of the total page number of programs.

``Operation'' The first memory has a capacity that can store the number of pages including at least half of all the programs, preferably about 70 to 80% of the programs with the smallest number of pages. With such a capacity, most of all input programs are stored in the first memory. For programs with a large number of pages, the first memory stores only up to part of the pages, so for programs with a preset large number of pages, all pages are stored in the second memory. In this way, by providing at least two levels of memory, a small amount of memory can be used and, moreover, it is possible to immediately reproduce the data.

"Example" Hereinafter, one example of the present invention will be described based on the drawings.

Reference numeral 1 designates a television video signal input terminal. A synchronization signal generation circuit 3 and a data clock generation circuit 4 are connected to this video signal input terminal 1 via a waveform equalization circuit 2, and an interface is connected to the data clock generation circuit 4. An error correction circuit 6 is coupled via the ace 5,
Furthermore, it is connected to a packet buffer 7 that temporarily stores program data, and a bus buffer 8.
is combined with 9 is the image processing CPU, and this
The CPU 9 is connected via a bus line 10 to a teletext program ROM 11, a memory 15 that stores all program data of the teletext program of the selected channel, a nonvolatile memory 12 that stores the program number, and a CGROM 1.
6. A printer interface 17, a melody processing CPU 18, a CRTC 19, and a system control CPU 20 for controlling the entire system are connected to each other.

An interrupt circuit 21 is also connected to the image processing CPU 9, a printer 22 as an external device is connected to the printer interface 17, and a buffer data RAM 2 is connected to the melody processing CPU 18.
3 and a sound source circuit 24 are combined, and this sound source circuit 24
is coupled to the TV interface 25.
A V-RAM 26 is coupled to the CRTC 19, and the TV interface 25 and RGB
An encoder 27 is coupled, and the TV interface 25 and RGB encoder 27 are coupled to TV connection terminals 28 and 29.

The system control CPU 20 includes a remote control 3.
0 light receiving section 31 is connected to the system reset output terminal 32 and the power on/off terminal 3.
3 is connected. The remote control 30 is provided with up and down keys for switching up and down pages.

The memory 15 consists of a first memory 15a and a second memory 15b. The first memory 15a is
The capacity is such that data for the number of programs including more than half of all programs can be stored. Specifically, in the first channel, out of 109 programs, there are many programs with pages 5 to 10, and the number of programs up to page 10 is 97 programs, accounting for more than 80% of the total. Therefore, this first memory 15a has a capacity of 109 programs x 10 pages = 1090 KB.
The second memory 15b has a capacity of 12 programs x 27 pages = 324 KB since it is sufficient to store the maximum page (27 pages) of the remaining 12 programs.
Therefore, a total of 1414KB is sufficient.

The operation of the circuit configuration as described above will be explained.

The TV video signal input from the TV video signal input terminal 1 is processed by the data clock generation circuit 4.
The teletext signal is extracted and converted into a digital signal. Then, program data per 1vd is stored in the packet buffer 7 via the BEST6. Before the next VD period, the program data stored in the packet buffer 7 is sequentially transferred and stored in the first memory 15a according to instructions from the CPU 9. To explain the above operation in more detail, ten pages of all programs are stored in the first memory 15a. That is, for example, if a program has only one page, the same page will be stored, and if the program has 10 pages, pages 1 to 1 will be stored.
Up to 10 pages are memorized. However, if the contents of the same page are updated, the data will be replaced with the updated data sequentially. Therefore, for programs of 10 pages or less, all pages of the contents of the first memory 15a are immediately reproduced and displayed in response to a command from the remote controller 30. For programs exceeding 10 pages, only 10 pages are stored in the first memory 15a, so all pages cannot be displayed. Therefore, if you want to watch a program that is over 10 pages long using the remote control
to reset. Then, the second memory 15b is divided equally to the number of programs that have been reset. That is, for example, 2
If only a program is reset, each program will be divided into equal parts of 162 KB, and if 12 programs are reset, each program will be divided into equal parts of 27 KB, so that all pages of the largest program can be stored.

In the embodiment described above, the first memory 15a stores all programs 10
Although the capacity is set to store each page, it may be set to 8 pages, 12 pages, etc. depending on the distribution of the number of programs and the number of pages. In the embodiment described above, the program name to be stored in the second memory 15b is manually preset, but if the number of pages is greater than or equal to the set number of pages, the number of pages is determined and automatically reset, and the program name is stored in the first memory 15a. Alternatively, the data may be transferred from there to the second memory 15b and stored therein. In the embodiment, the memory 15
has two stages, the first memory 15a and the second memory 15b, but the first memory can store up to 5 pages and the second memory can store up to 5 pages.
Up to 10 pages may be divided into three or more stages, such as 30 pages in the third memory.

"Effects of the Invention" (1) The memory is equipped with a first memory that stores up to a certain number of pages of all programs, and a second memory that stores all pages for programs that exceed a certain number of pages. , all programs, and all pages are stored in as little memory as possible, and all programs and all pages are played back without waiting time.

(2) The first memory has a capacity that can store the number of programs whose total page storage is 80% or more, so 80%
Programs with a small number of pages occupying more than 20 pages are stored in this first memory, and the remaining programs with a large number of pages are stored in this first memory.
% or less, and therefore, to store all programs and all pages, the memory capacity is one-fourth of the conventional memory capacity.
The number of parts can be reduced to below, and the number of parts can be reduced, making it possible to provide the product at a low cost.

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of a teletext receiver according to the present invention. 1... TV video signal input terminal, 7... Packet buffer, 9... Image processing CPU, 10... Bus line, 11... Program ROM, 12...
Non-volatile memory, 15...memory, 15a...first memory, 15b...second memory, 20...system control CPU, 30...remote control, 31...light receiving section.

Claims (1)

[Scope of Claims] 1. In a teletext receiver capable of storing all pages of all teletext programs in the same channel in a memory, the memory has a first memory that stores up to a certain page of all programs. and a second memory for storing all pages for programs with a number of pages exceeding a certain number of pages, and the first memory has a capacity capable of storing the number of programs whose total page storage is 80% or more. A teletext receiver comprising: 2. The teletext receiver according to claim 1, wherein the second memory is configured to store data divided into equal parts according to the preset number of programs.