JPH031774A - Superimposing device for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain high speed transfer of a data and confirmation of the transfer state by applying write during the period of readout timing of a screen display data from a storage means by a readout section by means a timing generator. CONSTITUTION:When a write operation end signal is inputted to a microcomputer 1, a data to be superimposed and an address signal are outputted respectively to a write data register 3 and an address register 2 and a write data input end signal is outputted to a timing generator 12, which outputs a bus switching signal for a period of timing when a readout section 10 reads out a screen display data from a RAM 11 and brings the RAM 11 to the write mode. The data write is implemented in one cycle of the data readout signal and the write operation end signal is outputted and it is repeated till the data is lost. Thus, the content of the memory is rewritten at a high speed while applying screen display during superimposition.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to superimposing data such as title characters and pictures on the superimposing screen of a magnetic recording and reproducing device. The present invention relates to a superimposing device for an integrated magnetic recording/reproducing device.

[Conventional technology]

Screen display data of the recorded video signal is read out from the storage means and displayed on the screen. When data related to title characters, pictures, etc. are superimposed on the contents of recorded screen display data, this is done using a camera-integrated magnetic recording and reproducing device. In this case, during that period, the address bus and data bus on which screen display data are recorded are switched to an address counter and a data register for superimposition, respectively, and the data to be superimposed is stored in the storage means. This is the current situation.

During the vertical blanking period in the vertical synchronization signal of the composite synchronization video signal, the microcomputer does not read screen display data from the storage means. Therefore, during this period, if the address bus and data bus are switched as described above, the data to be superimposed can be loaded into the storage means.

[Problem to be solved by the invention]

In the above-mentioned conventional technique, since the superimposed data is written during the vertical blanking period, the average speed of data transfer becomes slow. Further, when writing the above-mentioned data to the storage means at high speed, reading of data from the storage means must be interrupted during this period, so the screen display is interrupted and the data transfer status cannot be confirmed.

Furthermore, when data is transferred from an external device, it is transferred serially, which poses problems such as the time required to transfer a large amount of data.

[Means to solve the problem]

In order to solve the above-mentioned problems, a superimposing device for a magnetic recording/reproducing device according to the present invention stores screen display data and shifts from a read mode to a write mode using a write timing signal from a timing generator to write data. When a write operation completion signal is input from a storage means to write the data to an address specified by the timing generator, the data to be written to the storage means and its address signal are output to the writing part, and immediately after the output. A write data register having a microcomputer that outputs a manual write data completion signal to a timing generator, a write data register that temporarily stores data to be superimposed, and an address register that temporarily stores an address signal of a storage means to which the data is written. an address counter that specifies the address of the storage means in which the screen display data to be read is stored; and a read data register that temporarily stores the data read therefrom; a reading section that reads screen display data from the storage means based on a signal; a bus switching means that switches the connection of the address bus and data bus of the storage means from the reading section to the writing section according to a write timing signal from a timing generator; When a read timing signal is output to the read unit and a write data input completion signal from the microcomputer is input, the read unit outputs a write timing signal during the timing period when reading screen display data from the storage means, and the bus The present invention is characterized by comprising a timing generator that outputs a write operation completion signal to the microcomputer after data is written to the address of the storage means designated by the writing section switched by the switching means.

[Operation] According to the above configuration, the address bus and data bus of the storage means are normally connected to the address counter and read data register of the read section, respectively. The screen display data stored in the storage means at the address specified by the address register is read out based on the read timing signal.

Here, when the write operation completion signal is input to the microcomputer, the data to be superimposed and the address signal of the storage means to store it are transferred from the microcomputer to the write data register and address register of the write section. Each is output. Immediately after this output, a write data input completion signal is output from the microcomputer to the timing generator.

The timing generator outputs the write timing signal during a timing period when the reading section reads out the screen display data from the storage means. In response to this signal, the bus switching means switches the connection of the address bus and data bus of the storage means from the reading section to the writing section. Then, data is written to the address of the storage means specified by the writing section. When data writing is completed, a write operation completion signal is output from the timing generator to the microcomputer, and the above-described operation is repeated until there is no more data to be superimposed. In this way, the data to be superimposed is written to the storage means.

〔Example〕

An embodiment of the present invention will be described below based on FIGS. 1 and 2.

As shown in FIG. 1, a superimposing device for a magnetic recording/reproducing device according to the present invention mainly includes a microcomputer 1, a writing section 4, a bus changeover switch 7 as a bus switching means, a reading section 10, and a storage means. RAM II and a timing generator 12.

The microcomputer 1 is connected to an address register 20 input in the writing section 4 via an address bus. Further, the microcomputer 1 is connected to the input of a write data register 3 in the write section 4 via a data bus.

When a write operation completion signal is input from a timing generator 12, which will be described later, the microcomputer
The data to be written to II and its address signal are output to the writing section 4. This data relates to title characters, pictures, etc. that are added to the screen display data. R.A.
Screen display data is stored in the MII. Immediately after outputting to the writing unit 4, the microcomputer 1
As shown in the write data input completion signal waveform (a) in FIG. 2, the write data input completion signal is output to the timing generator 12.

When the write data input completion signal is input, the timing generator 12 generates the out enable signal waveform (
As shown in b), a high level out enable signal in binary logic is output to the out enable terminal OE of RAMII. Further, the generator 12 outputs a low-level write enable signal to the write enable terminal WE of RAMII, as shown in the write enable signal waveform (C) in FIG. Along with this, the RAM II shifts from the read mode to the write mode, so that the data to be superimposed is written to the address of the RAM II specified by the address register 2.

On the other hand, when the RAMII is in the read mode, the timing generator 12 outputs a low-level out enable signal to the out enable terminal OE, as shown in the out enable signal waveform (b) in FIG. As shown in the write enable signal waveform (e) in FIG. 2, a high-level write enable signal is output to the write enable terminal WE. Note that the above-mentioned write enable signal and out enable signal are low-level and active write signals. It is a timing signal.

The writing section 4 described above is composed of an address register 2 and a write data register 3. The write data register 3 temporarily stores data to be superimposed. The address register 2 temporarily stores the address signal of the RAM II into which this data is written. When the RAM II enters the write mode, the data stored in the write data register 3 is written to the address of the RAM II specified by the address register 2.

The output of the address register 2 is the bus selector switch 7.
It is connected to the contact 5a of the address bus changeover switch 5 inside. The switch 5 is for switching a plurality of connection lines at the same time. For example, if the microcomputer 1 is an 8-bit one, 16 address lines will be connected. The contact 5c of the switch 5 is RA
It is connected to a corresponding address terminal (not shown) of MII. A contact 5b of the switch 5 is connected to the output of an address counter 8 in a reading section 1O, which will be described later.

Further, the output of the write data register 3 is connected to a contact 6a of a data bus changeover switch 6 in the read section 10. The switch 6 is used to switch a plurality of connection lines at the same time. For example, if the microcomputer 1 is an 8-bit one, eight data lines will be connected. The contact 6c of the switch 6 is the RAM
It is connected to a corresponding data terminal (not shown) of II. A contact 6b of the switch 6 is connected to an input of the read data register 9.

For example, when reading screen display data, RAM
11 address buses are connected to the contact 5b side. At this time, the data bus of RAM II is connected to contact 6b. At the time of superimposing, the address bus changeover switch 5 is connected to contact 5 by the bus changeover signal.
b to contact 5a. At the same time, the data bus changeover switch 6 is switched from the contact point 6b to the contact point 6a by the bus changeover signal. The bus switching signal has the bus switching signal waveform (d) in Figure 2.
As shown in , this is a signal that is active at low level.

The reading unit 10 is composed of an address counter 8 and a read data register 9. The address counter 8 specifies the address where the data to be read is written when reading the screen display data from the RAM Mll. The read data register 9 reads out the screen display data written to this designated address and stores it for - hours. Address counter 8 has
A count clock signal is input, and a data read signal is input to the read data register 9.

The count clock signal and data read signal are read timing signals.

For example, in the RAM II read mode, the RA written to the address specified by address counter 8
The address counter 8 is operated based on the count clock signal from the timing generator 12 to sequentially designate addresses to read MII screen display data. Screen display data stored at the designated address is read out based on the data read signal. The data read signal is a low level active pulse signal as shown in the data read signal waveform (e) in FIG. Note that the output of the read data register 9 is connected to the data bus of the microcomputer 1.

In the above configuration, the address bus and data bus of RAMII are normally connected to the address counter 8 and read data register 9 of the read section 10, respectively. The screen display data of the RAM II stored at the address specified by the address counter 8 is sequentially read out based on the count clock signal and the data read signal. After being processed by an image processing device (not shown), it is reproduced by a monitor receiver (not shown).

Here, the write operation completion signal active at a high level shown in the write operation completion signal waveform (r) in FIG.
When input to the microcomputer 1, the super 7-imposed data and the address signal of the RAM II in which it is to be stored are outputted from the microcomputer 1 to the write data register 3 and the address register 2, respectively. Immediately after this output, a write data input completion signal is output from the microcomputer 1 to the timing generator 12.

When the write data input completion signal is input, the timing generator 12 sends a bus switching signal to the address bus changeover switch 5 and the data bus changeover switch 6 during the timing period when the readout unit 10 reads screen display data from the RAM II. Output. The generator 12 also causes RAM II to transition to write mode. As a result, the connection of the RAM II address bus and data bus is switched from the reading section 10 to the writing section 4. Then, the RAM specified by address counter 8
The data of the write data register 3 is written to the address II. Data writing is performed within one cycle of the data read signal. When data writing is completed, a write operation completion signal is output from the timing generator 12 to the microcomputer 1, and the above-described operation is repeated until there is no more data to be superimposed.

〔Effect of the invention〕

As described above, the superimposing device of the magnetic recording/reproducing device according to the present invention stores the screen display data, and shifts from the read mode to the write mode based on the write timing signal from the timing generator, and specifies the data in the write section. When a write operation completion signal is input from the timing generator and the storage means for writing the data to the address to be written, the data to be written to the storage means and its address signal are output to the writing section, and the write data is written immediately after the output. a writing unit having a microcomputer that outputs an input completion signal to a timing generator, a write data register that temporarily stores data to be superimposed, and an address register that temporarily stores an address signal of a storage means to write the data; It has an address counter that specifies the address of the storage means where the screen display data to be read is stored, and a read data register that temporarily stores the data read therefrom, and based on the read timing signal from the timing generator, A reading unit that reads screen display data from the storage unit; a bus switching unit that switches the connection of the address bus and data bus of the storage unit from the reading unit to the writing unit in response to a write timing signal from a timing generator; and a bus switching unit that reads out the read timing signal. At the same time, when a write data input completion signal from the microcomputer is input, the reading section outputs a write timing signal during the timing period when the screen display data is read from the storage means, and is switched by the bus switching means. The configuration includes a timing generator that outputs a write operation completion signal to the microcomputer after data is written to the address of the storage means specified by the write unit.

Thereby, during superimposition, the contents of the memory can be rewritten at high speed while displaying the screen. Therefore, in the video-integrated magnetic recording and reproducing device, when title characters, pictures, etc. are transferred from an external device to the memory, the data transfer status can be checked in real time. Furthermore, even when the amount of data to be transferred is large, it can be transferred to the memory at high speed.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention. FIG. 1 is a block diagram showing the configuration of a superimposing device of a magnetic recording/reproducing device according to the present invention. FIG. 2 is a diagram showing signal waveforms of various parts of the superimposing device of the magnetic recording/reproducing device according to the present invention. 1 is a microcomputer, 4 is a write unit, 7 is a bus changeover switch (bus changeover means), 10 is a readout unit, 11 is a RAM (storage means), and 12 is a timing generator.

Claims (1)

[Scope of Claims] 1. Storage means for storing screen display data, shifting from a read mode to a write mode in response to a write timing signal from a timing generator, and writing the data to an address specified by a writing section; When a write operation completion signal is input from the timing generator, the microcomputer outputs the data to be written to the storage means and its address signal to the write section, and immediately after the output, outputs a write data input completion signal to the timing generator. a writing section having a write data register that temporarily stores data to be superimposed, an address register that temporarily stores an address signal of the storage means to which the data is written, and an address of the storage means in which the screen display data to be read is stored. a readout section that has an address counter that specifies the address counter and a readout data register that temporarily stores the data read out from the readout data register, and reads out the screen display data from the storage means based on a readout timing signal from the timing generator; bus switching means for switching the connection of the address bus and data bus of the storage means from the reading section to the writing section in response to the write timing signal from the timing generator; When the input completion signal is input, the reading section outputs a write timing signal during the timing period when reading screen display data from the storage means, and writes the data to the address of the storage means specified by the writing section switched by the bus switching means. A superimposing device for a magnetic recording/reproducing device, comprising a timing generator that outputs a write operation completion signal to a microcomputer after data is written.