JPS6113786A - Teletext receiver - Google Patents

Abstract

PURPOSE:To store a large amount of data of teletext in a small-sized and portable receiver by incorporating a cassette tape recorder in a receiver and storing display data of teletext on a cassette tape. CONSTITUTION:An automatic program memory circuit 7 and character receiving/processing circuit 8 are connected to a character receiving circuit part 4. To these circuits 7 and 8 are connected a cassette tape memory circuit 9 consisting of a cassette tape recorder and a key input 10 for selecting programs. When the circuit 7 judges at the time of starting of the teletext reception that a data packet transmitted from the circuit part 4 is a program index one, program codes stored sequentially in an information data part of the packet activate the circuit 9. Afterward, the character reception processing is executed through the circuit 8, and received display data, etc., are successively stored in the circuit 9.

Description

[Detailed description of the invention] ,〈Industrial application field〉 The present invention relates to a teletext receiver.

<Prior art> Teletext is a system in which image information consisting of text and simple graphics is multiplexed onto television broadcast waves in the form of digital signals and transmitted.The receiving side stores this information in memory and then transmits it. , a system that converts the signal into a television signal and displays it on a television receiver, and is currently under development or test broadcasting in various countries.0 In the teletext system developed in Japan,
The character multiplex signal is a horizontal scanning line from the 10th H to the 21st H in the vertical blanking period, and from the 273rd H to the 284th H in the even field (hereinafter referred to as the multiple H period). superimposed on the line.

At this time, the character multiplex signal is transmitted after the horizontal synchronization signal and the color burst. A data packet is a unit of a series of teletext signals transmitted during one horizontal scanning period, and has a length of 37 bytes. The first 6 bytes of a data packet is called a header part, and the 31-byte information data section at the end specifies the type of data to be transmitted.

There are six types of data packets. program index bucket)
(PIF) is a packet lift that transmits program numbers for indexing all programs currently being transmitted, and a maximum of 15 program numbers can be transmitted in one packet. In addition, mainly that one page (
1 screen) A page control packet that transmits control signals for the whole, a color code packet ζ that transmits coloring, flushing, and conceal information for each color block, There are pattern data packets that transmit pattern information, horizontal scroll data packets that are transmitted in the case of -line horizontal scroll display, and dummy packets that are transmitted without inserting information data. One page of information is transmitted with the page control packet at the beginning in modes other than horizontal scroll mode, and it takes several seconds to transmit one page of data. A plurality of programs are sequentially transmitted one page at a time, and therefore, display data for one program is transmitted intermittently.

By the way, since a plurality of teletext programs are sent to each broadcast channel, a teletext receiver specifies and receives a program.

<Purpose of the Invention> The present invention aims to effectively utilize such teletext receivers, and in particular, includes a built-in cassette tape recorder in the receiver to record teletext display data on the cassette tape. It is something that makes you remember.

<Examples> The present invention will be described below with reference to examples shown in the drawings. 1st
The figure shows a schematic configuration of a teletext receiver according to the present invention, in which a television signal is transmitted to a television antenna l without being switched.

The receiving section 2 is a receiving section of a standard television receiver that includes an RF amplification/IF amplification/detection circuit, and receives the obtained composite video signal after performing RF amplification/IF amplification and detection processing on the input signal from the antenna. is input to the television receiving circuit section 3 and the character receiving circuit section 4. The television receiving circuit section 3 processes a normal television signal, and its output signal is displayed on a cathode ray tube 6 via a television output/character output switching circuit 5. A program automatic storage means 7 and a character reception processing means 8 are connected to the character reception circuit section 4 . These means 7,
8 has a cassette. - A cassette tape storage means 9 consisting of a pre-cog and a key power 10 for program selection are connected. When the program automatic storage means 7 determines that the data packet sent from the text reception circuit section 4 is a program index packet at the start of teletext reception, the program automatic storage means 7 stores the program codes sequentially stored in the information data section as described above. The cassette tape storage means 9 is activated. Thereafter, character reception processing is performed via the character reception processing means 8, and the received display data, etc. are sequentially transferred to the cassette tape storage means 9.
will be remembered.

Next, the program automatic storage means 7 and the cassette tape storage means 9 will be specifically explained using FIG. 2.

For data processing of character reception, there is a character reception circuit section 4, a buffer memory 11 for storing data packet data, a CPU 12 used for data processing, and a ROMI 3 storing a program for operating the CPU. ,
Working memory 14 for data processing of CPU 12
and a cassette tape recorder 15 which is the above-mentioned cassette tape storage means 9 for storing teletext data, and an address bus 16 . data bus 17
are interconnected through. In addition, a key input 1 (1) consisting of push buttons, etc., inputs a signal instructing the selected program to the CPU 12.The output of the character receiving circuit section 4 is sent to the cathode ray tube 6 via the TV output/character output switching circuit 5. Is displayed.

The program in the ROM 1.3 automatically stores programs in accordance with the procedure shown in the flowchart shown in FIG.

When starting to receive text broadcasting, the text reception circuit section 4 does not switch.
The data of the data packets received during the multiplexed H period are sequentially written into the backup memory 11 (step 31).
. When writing to the buffer memory 11 is completed (step 3-2), the process moves to the next step. It is determined whether the data packet written in the buffer memory 11 is a program index packet (steps 33 and 34).The program index packet is transferred to the cassette tape recorder 15 as shown in step 35 (step 35). The procedure of ROMI is completed.
The program in a describes the procedure for character reception processing after the program automatic storage procedure, and is included in the character reception processing means 8, but its explanation will be omitted.

The program automatic storage means 7 includes a buffer memory 11 and a CPU 1.
2 @ROMI 3・Working memory 14・Address bus 16・Data bus 17 and above steps 31~
<Effects of the Invention> According to the teletext receiver of the present invention, a cassette tape recorder is built into the receiver as described above, and display data of teletext broadcasts can be stored on the cassette tape. As a result, the following effects can be expected. That is, since a large amount of fil teletext data can be stored, it is easy to utilize it as information.

(2) Since only the cassette tape can be displayed using a separate teletext playback device, it can be used as a portable media that provides information. In the case of a shelter, the reproduction-only machine can be made smaller by using a liquid crystal display, an EL display, a plasma display, or the like.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic configuration of a teletext receiver according to the present invention, FIG. 2 is a block diagram of an embodiment according to the present invention, and FIG. 3 is a flowchart showing the procedure for automatic program storage in the same embodiment. be. 4...Character receiving circuit section 15...Cassette tape recorder. Agent Patent attorney Aihiko Fuku (and 2 others) Figure 2 Figure 3

Claims (1)

[Claims] 1. A teletext receiver characterized in that a cassette tape recorder is built into the receiver and teletext programs are automatically stored on the cassette tape.