JPH0292083A - Teletext broadcast receiver - Google Patents

Abstract

PURPOSE:To reproduce a music continuously even if a hard copy of an orchestral accompanyment program or the like is taken by applying data transmission from a printer memory to a printer and applying display processing. CONSTITUTION:A DMA circuit 12 applies transfer by a logic L level signal from a NOR circuit 13 for a period when no write is applied to a display memory 7 and for a period of no print. Moreover, The DMA circuit 12 stops the transfer by using a logic H level signal from the NOR circuit 13 at a print period other than the character signal fetch period. When a print key is depressed, a CPU 2 uses a signal representing the print period to stop the DMA circuit 12 and to stop the write to a printer memory 11 thereby transferring a data to a printer interface 9 from the printer memory 11. In this case, the display by the display memory 7 and the data transmission from the printer memory 11 are implemented simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a teletext receiver, and more particularly to a teletext receiver capable of simultaneously performing display processing and printing processing.

(Prior Art) Teletext broadcasting is a system that repeatedly transmits various kinds of text multiplex programs in the form of digital signals during a specific horizontal scanning period of the vertical blanking period of a television signal. The receiving side is equipped with a buffer 7 memory for capturing multiplexed signals.
The information sent is sequentially written into this buffer memory. In this case, when the receiver specifies the number of the desired program from among these multiple pieces of information, the control signal of the specified program is searched, and only the information of subsequent specified programs is stored in the buffer. The desired program can be read out from the memory and viewed. Furthermore, it is now possible to take a hard copy of the teletext screen using a printer connected to the receiving side.

FIG. 2 shows a block diagram of a circuit related to printing processing in a conventional teletext receiver. In this figure, reference numeral 1 denotes a data acquisition circuit, which extracts a character multiplex digital signal from a television signal according to instructions from a CPU 2 and performs error correction, and the error-corrected data is sequentially written into a buffer memory 3. An output end of the data acquisition circuit 1 is connected to a data bus 4. The buffer 'Jl memory 3 is controlled by the CPLI 2 and outputs the data of the program designated by the keyboard 5. This data is CPL
After being decoded into display data by J2, it is output to the display memory 7 via the display controller 6, and the CP
The three primary color signals R are read out from the display memory 7 at the display timing of the display controller 6 controlled under LJ2.
, G, B, and are converted into control signals YS and 'l, which are output from the display controller 6. Then, it is combined with a television image signal in an image switching unit of a receiver (not shown) and displayed on a CRT. The signal 8 is generated during the period when the data acquisition circuit 1 uses the data bus 4 (period f!II from 10H to 21H of the vertical retrace period), that is, during the character multiplex signal acquisition period, CPLI2.
This is a signal to stop (halt) the 8
Therefore, writing to the display memory 7 is prohibited at least during the 11th period from the 10th H to the 21st H.

Now, in this receiver, a printer interface 9 is connected to the data bus 4, and a printer 10 is connected to this printer interface 9. When the print key is pressed, the CPU 2 reads data from the display memory 7 and transfers the data to the printer 9. During this transfer period, the CPU 2 prohibits rewriting the display memory 7, so when printing a program such as a karaoke program in which the music and display progress in synchronization, the music may be paused during the printing period ( There was a drawback that it had to be made (pause). In addition, in printers with slow printing speeds, even if the next page is sent, the display memory 7 is
Since it is not possible to write to the page, there is a drawback that the time required to display the next page is shortened.

(Problems to be Solved by the Invention) As described above, the conventional receiver has a problem in that when making a hard copy of a karaoke program, the music must be temporarily stopped during the printing period. In addition, printers with slow printing speeds have a problem in that the display period for the next page is shortened.

Therefore, the present invention is intended to eliminate the above-mentioned problems.It is possible to perform data transfer to the printer and display operation at the same time, and even when making a hard copy of a karaoke program, the music can be played continuously, and the printing It is an object of the present invention to provide a teletext receiver in which the display time does not become short even when a slow printer is used.

[Structure of the Invention] (Means for Solving the Problem) The teletext receiver of the present invention is provided with a printer memory for storing data transferred from the display memory in addition to the display memory. a transfer means for sequentially transferring data from the display memory to the printer memory; and a transfer means for stopping the transfer operation of the transfer means during a write period to the display memory and a read period from the printer memory; The present invention is characterized in that it includes means for causing the transfer means to perform a transfer operation during a period other than the above.

(Function) In the present invention, display processing can be performed at the same time as data is transferred from the printer memory to the printer (or in a time-sharing manner). Therefore, the music does not pause when copying a karaoke program, and the display time of the next page does not become short even when using a printer with a slow printing speed.

(Example) The present invention will be described below based on the example shown in the drawings.

FIG. 1 is a block diagram showing a teletext receiver according to an embodiment of the present invention.

In this figure, the same components as in FIG. 2 are given the same reference numbers. The difference from FIG. 2 is that a printer memory 11 is provided in addition to the display memory 7, and a DMA (direct memory access) circuit 12 is provided to sequentially transfer data from the display memory 7 to the printer memory 11. and that an NOR circuit 13 is provided to control the transfer operation of the DMA circuit 12.

One input terminal of the NOR circuit 13 has a vertical return 111 [
S] (VBLK) (7) Signal to stop the CPU2 during the period from 10H to 21H] 1^LT (10H to 2
(during the period of 1 to 1, the logic H level) is input, and the other input terminal indicates that it is the printing period.
A signal POUT from DMA circuit 2 (which is at a logic L level during the printing period) is input, and a signal HALT for stopping the DMA circuit 12 is output from its output terminal.

Then, the display controller 6 controls data writing from the CPU 2 to the display memory 7, reads display data from the display memory 7, and writes R, G, B, YS,
It controls the function of converting into a signal and outputting it, and also controls reading of data from the printer memory 11.

The rest of the configuration is the same as that in FIG. 2, so the explanation will be omitted.

In the above configuration, the DMA circuit 12 operates during a period in which writing is not performed on the display memory 7 (i.e., the character
NO during signal acquisition period) and non-printing period
A transfer operation is performed by a logical level signal from the R circuit 13. Further, the DMA circuit 12 stops the transfer operation in response to the logic 1 level signal from the NOR circuit 13 during the printing period during the 1II1 period other than the character signal acquisition period. Therefore, since data is sequentially transferred from the display memory 7 to the printer memory 11 during each character multiplex signal acquisition period, the printer memory 11 has the same data as the normal display memory 7. Similar to printer memory 1
The data transferred to No. 1 may be data necessary for printing. For example, only the luminance signal is sufficient. Moreover, the transfer from the display memory 7 to the printer memory 11 may be performed in parts, instead of sending one screen at a time. By repeating the transfer operation by the DMA circuit 12 as described above, the data in the printer memory 11 is refreshed to new display data. When the print key is pressed, the CPU 2 stops the DMA circuit 12 in response to a signal indicating the printing period, stops writing to the printer memory 11, and transfers data from the printer memory 11 to the printer interface 9. At this time, the display on the display screen 97 and the data transfer from the printer memory 11 can be performed simultaneously, or can be performed in a time-sharing manner.

[Effects of the Invention] As described above, according to the present invention, display processing and printing processing can be performed simultaneously, and even when making a hard copy of a karaoke program, music can be played continuously, and the printing speed can be improved. Even when using a slow printer, the display time of the next page will not be shortened.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a teletext receiver according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional teletext receiver. 1...Data acquisition circuit, 2...CPU, 3...
Buffer 7 memory, 4...Data bus, 5...Keyboard, 6...Display controller, 7...Display memory, 9...Printer interface, 11...Memory for printer, 12...・DMA circuit,
13...NOR circuit.

Claims (1)

[Claims] Character multiplexed data of characters, graphics, and music superimposed on the vertical retrace period of a television broadcast signal is captured, a desired program is specified, decoding processing is performed, and the data is written to a display memory. A teletext broadcasting receiving device that reads out display output or printer output includes: a printer memory that stores data transferred from the display memory; and a printer memory that sequentially transfers data from the display memory to the printer memory. and a means for stopping the operation of the transfer means during a writing period to the display memory and a reading period from the printer memory, and operating the transfer means during other periods. A teletext broadcasting receiver characterized by: