JPS6242667A - Picture display system - Google Patents

Abstract

PURPOSE:To display a facsimile signal, etc., with the maximum picture frequency with a TV receiver by reading and writing a picture signal recorded to a sheet memory with a different frequency through a buffer memory. CONSTITUTION:The picture signal with a high maximum picture frequency such as the facsimile recorded at the sheet memory is alternately written through a reproducing circuit 7 to the buffer memories 18 and 19. The writing is executed by sampling the output picture signal of the reproducing circuit 7 with the first clock 20. On the other hand, the reading from the buffer memory is executed by using the second clock 21 with the frequency lower than the first above-mentioned clock 20. Thus, the picture signal recorded in the sheet memory once is converted to the picture signal having the picture frequency which can be dissolved by a television receiver 11.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to an image display device.

(Prior Art) FIG. 1 is a block diagram of a conventional device. This device has a magnetic sheet memory as an image memory, which rotates a disc-shaped magnetic sheet on the receiving side and records data by pressing a magnetic head against it, and records the slowly transmitted image signals in the memory. This is a device that allows a single image to be viewed indefinitely on a display device such as a television receiver even after the signal has been transmitted.

The image transmitter 1 is, for example, a facsimile transmitter, and is generally equipped with a modulator 2 to pass through a transmission line 3 of radio or telephone line.
Use. The modulated image signal sent through the transmitter 3 passes through the demodulator 4 and is returned to the original image signal.

The recording circuit 5 modulates the image signal into a form that is easy to record on the magnetic sheet memory, and includes a memory recording case 1. The recording circuit 5 converts the image signal transmitted under the control of the controller 9 into a magnetic sheet memory. Record in memory 6. There is a recording method in which a magnetic sheet is slowly rotated to record the slowly transmitted information as it is, and there is also a method in which the information is recorded once in a buffer memory and then read out at high speed and divided and recorded on a sheet. The servo circuit 10 rotates the motor of the sheet memory in synchronization with the synchronization signal separated from the image signal by the synchronization separation circuit 8 in order to record the image signal at a predetermined position on the sheet. - The image signal recorded on the sheet includes a vertical synchronization signal and a horizontal synchronization signal that meet the standards of commercial television broadcasting so that the sheet can be rotated at high speed, reproduced, added to the television receiver 11, and displayed as is. . These synchronization signals can be included in the image signal and sent in advance at the time of transmission, or can be recorded simultaneously when the image signal is recorded in the sheet memory.

The image signal reproduced through the reproduction circuit 7 is applied to a display device 1 such as a television receiver, and an image is displayed on the display device 5.
In such conventional technology, the signal for one screen displayed on a television receiver is recorded in memory and played back as is. Figure 2 shows the signal.The image signal includes a vertical synchronization signal V and a horizontal synchronization signal H so that it can be displayed on a television receiver.If the image signal S sent is a facsimile signal, In this case, the signal for raw scanning is contained in one horizontal scanning period in the case of television.

A television receiver is accommodated in one horizontal scanning period in the case of television. According to the television broadcasting standards, the resolution of a television receiver is 350 pixels in the vertical direction.
There are approximately 340 TVs horizontally. On the other hand, facsimile devices generally have a resolution of 4 lines/mi or more, and if this is converted to the resolution of a television, the number of lines in the horizontal direction will be 600 TV lines even on a paper page with an effective width of about 150 lines. As described above, facsimile images generally have a higher resolution than television images, so when a sent document is displayed on a television imager, fine text cannot be read as it is.

Furthermore, this is very inconvenient, as the original used for facsimile transmission cannot be used as is for recipients whose receiving end is a television receiver, and must be rewritten in larger characters.

(Problems to be Solved by the Invention) As described above, in the conventional technology, when the resolution of the image to be displayed and the resolution of the display device are different, the displayed image becomes difficult to read.
Also, if you try to make it easier to read, the procedures etc. will become complicated, which is not desirable.

Therefore, the present invention has a simple configuration, even when the resolution of the image to be displayed and the resolution of the display device are different.
An object of the present invention is to provide an image display method that can display images that are easy to read.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides an image display system that includes a first storage means for storing a signal representing an image at a first resolution, and a first storage means for storing a signal representing an image at a first resolution. a first means for reading out the signal; a second storage means for temporarily storing the signal read by the first means; and a second means for reading the signal stored in the second storage means. and a second storage means for displaying the signal read by the second means as an image at a second resolution lower than the first resolution; By sampling the same image at the first resolution, the signal when representing the same image at the second resolution is stored in the second storage means. The second means is characterized in that the signal stored in the second storage means is supplied to the display means in accordance with the display timing of the display means.

(Function) In this invention, the image stored in the first storage means is not displayed directly on the display device, but is displayed on the display device via the second storage means.

Here, when storing the signal in the second recording means, the first
For the signal stored in the first storage means by the means,
By sampling the same image in the first
The signal expressed at the resolution (first resolution) in the storage means is used as the signal port when expressed at the resolution at the display means.

Further, the second means supplies the signal stored in the second storage means to the display means in accordance with the display timing of the display means. Therefore, the image stored in the first storage means is appropriately displayed on the display means.

(Example) The present invention will be explained in detail below using examples.

FIG. 3 shows the configuration of the present invention. Image transmitter 1, modulator 2
, transmission line 3, demodulator 4, recording circuit 5, synchronization separation circuit (1
) 8, controller (1) 9, servo circuit 10, etc., are all the same as in the conventional example.

The difference between the present invention and the conventional example lies in the method of reproducing the signals recorded on the sheet. The signal recorded in the sheet memory is returned to the original signal through the reproducing circuit 7, and is written alternately into the two buffer memories 18 and 19. It is preferable that the buffer memory has variable writing and reading speeds.

Writing of the image signal into the buffer memory is performed by the first clock generator 20, and reading is performed by the second clock generator 21. In this method, the frequency of the first clock is higher than the frequency of the second clock.
It has a higher relationship than Kurotsuku. The read image signal is sent to an image synthesis circuit 2 so that it can be displayed on a television receiver.
5, a vertical synchronizing signal and a horizontal synchronizing signal are added to the signal and the signal is displayed on the television receiver 11. Second synchronous separation circuit 2
3 extracts only each synchronizing signal from the image signal 4:4 including the vertical synchronizing signal and horizontal synchronizing signal reproduced from the sheet memory. The second controller 22 distributes the reproduced signal to the buffer memory based on the separated vertical and horizontal synchronization signals, and controls the first and second controllers. The second clock generator 2'0.21 is switched.

The synchronization signal is also sent to a synchronization signal generator 24. This circuit generates a new vertical synchronizing signal at step 17 based on the synchronizing signal read from the sheet memory, and as described later, the vertical This allows images to be displayed arbitrarily.

Figure 4 shows the state of recording on the sheet memory.
For an image signal including vertical and horizontal synchronizing signals, if one field is recorded in one track and the image continues in the vertical direction, the number of tracks may be increased.

Next, to make the function of this device more clear, we will explain it using signal waveforms.

Figure 5 is a waveform diagram explaining the basic operation of this device.
is the image signal waveform reproduced from the sheet memory. b
is the waveform of the write clock to the buffer memory, and this clock is used to sample the image signal and store it in the buffer memory.

C is a waveform of a read clock from the buffer memory, and the frequency is selected to be 4 MHz or less, which allows resolution on the television even if the image signal is read from the buffer memory at this frequency. d is an image signal read out from the buffer memory, and since it was read out with the clock C, the maximum picture frequency is a frequency that is common even in televisions. As shown in the figure, the image signal contained in the first horizontal scanning period H1 is read out in the second horizontal scanning period H2, and the image signal contained in the second horizontal scanning period H2 is read out in the second horizontal scanning period H2. , the third period H3, etc., are read out with a shift of one horizontal scanning period. e is the final signal waveform obtained by combining the vertical and horizontal synchronization signals and the image signal, and it depends on the timing shown in d, so on the sheet, the image signal included in the IH, and after being combined, it is the image signal included in the 2H. It has been inserted. In this way, by reading the image signal once recorded in the sheet memory at different frequencies via the buffer memory and reading it out, even facsimile signals with a high maximum image frequency can be converted into image frequencies that can be resolved by the television receiver. It can be converted into an image signal that has

On the other hand, as shown in Figure 5 a and b, only a part of the image signal recorded in the sheet memory is written to the buffer memory, so the facsimile image displayed on the television receiver is also recorded as an image signal. is part of. Therefore, it is necessary to be able to see the entire image that is sent using an atomic method.

The method is described below. FIG. 6 shows this method using waveforms.

FIG. 6a shows a facsimile image signal recorded on a sheet similar to FIG. 5a. b is the buffer memory write clock start pulse generated by delaying the horizontal synchronization signal by an arbitrary time "H". The write clock C is generated in synchronization with this start pulse. That is, the write clock - By changing the start position of the link, the position at which sampling of the image signal in the sheet memory starts can be changed.
d.

These are the image signals combined with the image signals f and the synchronization signals corresponding to the readout pulses e and d, respectively.

Since the start pulse is delayed by a certain period of time from the horizontal synchronization signal, it can be generated using a monostable multi-noise ibrator, etc., and the delay time can also be changed by a paliohm, so it can be used to generate an image of any horizontal part and the paliohm. You can see it by 1 = ke which moves etc.

Although the explanation so far has been related to the horizontal direction, the same method can be used when the resolution is high in the vertical direction and when the paper surface is longer in the vertical direction than the screen of the television receiver. FIG. 7 shows this method using waveforms, and shows an example in which signals are recorded on two tracks concentrically by two heads on a sheet. A is a signal recorded on the first track and includes one vertical synchronization signal and a fixed number of horizontal synchronization signals per track. If the image signal continues in the vertical direction, the recording head is switched and the signal is recorded continuously on the second rack as shown in b.

For playback, data is written to and read from the buffer memory as described above, but if you want to shift the image in the vertical direction, the vertical synchronization signal of the signal read from the first track is delayed by an arbitrary time T from the vertical synchronization signal, as shown in C. A synchronization signal is generated, and the image signal is read out from the first track and second trunk as shown in d, combined with a vertical synchronization signal, and added to the television receiver for display. Since this method does not perform interlacing, - the number of horizontal synchronization signals included in the vertical scanning period must be an integer number.

Furthermore, even if the vertical and horizontal synchronizing signals are in an interlaced relationship, they can be displayed with a shift in the vertical direction using the same method.

FIG. 8 shows the concept of image display according to the present invention.
A page larger than the display screen of a television receiver can be viewed by moving the volume or the like.

(1) In the conventional technology, since the resolution of the television receiver as an image receiver is not very high, it was not possible to send a high resolution image signal.However, according to the present invention, the television receiver as an image receiver cannot send a high resolution image signal. Even if you use a machine, you can send high-resolution originals.

(2) In the conventional technology, if you wanted to see a high-resolution image, you needed an expensive display device that could display the high-resolution image, but according to the present invention, you can use an inexpensive television that can display high-resolution images. You can watch it on the receiver.

(3) With conventional technology, it took time and effort to rewrite high-resolution fax documents in large letters to match the resolution of the receiver; (I can do it, so I don't have to worry about rewriting it.

The present invention is not limited to the above embodiments, but can be modified in various ways as follows.

(1) According to the above embodiment, a magnetic sheet memory is used as the main memory, but a magnetic memory with a rotating disc such as a magnetic disk can also be used.

(2) According to the embodiment, a CCD memory uses a magnetic sheet memory as the main memory, but the way the signal is reproduced over time is the same as the magnetic sheet memory, that is, the CCD memory must be constantly read out at a constant speed. , MOS dynamic memory, etc. (to which the present invention can also be applied).

(3) According to the embodiment, the image signal ζ to be transmitted has a high resolution that is sent slowly (1 facsimile cloud) (although it is a word, it is not only a facsimile signal, but also a high resolution that is sent instantaneously) Of course, image signals such as television (words, etc.) may also be used.

(4) According to the embodiment, the delay times T and T from the synchronization signal can be changed by changing the pali-ohm)】9v The image that is being viewed is moved, but instead of the pali-ohm, T and T can be changed at the same time. Button (9v -le, stick 1) Also, by pressing the button, the delay will be delayed in steps.
Possible variations include automatically flowing in a specified direction, such as up or down, or changing the speed of the flow depending on how hard you press the button.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a conventional device, FIG. 2 is a waveform diagram of an image signal recorded in a sheet memory of the conventional device, and FIG. 3 is a block diagram showing the configuration of a device according to the present invention. FIG. 4 is a diagram showing the position of the image signal recorded on the magnetic sheet of the device according to the present invention on the magnetic sheet, and FIG. 5 is a diagram showing the image signal buffer memory read clock and successive clock recorded on the magnetic sheet of the device according to the present invention. , a waveform diagram of a read image signal, a composite image signal, and FIG. 6 shows an image signal recorded on a magnetic sheet of the device according to the present invention, a buffer memory read clock start pulse, a read clock, a read clock, and a read image signal. , a waveform diagram of the synthesized image signal, and FIG. 7 shows the image signal of the first track recorded on the magnetic sheet of the apparatus according to the present invention, the image signal of the second track, the vertical synchronization signal delay pulse, and the waveform of the synthesized image signal. waveform diagram,
FIG. 8 is a diagram for explaining the present invention in detail. DESCRIPTION OF SYMBOLS 1... Image transmitter, 2... Modulator, 3... Transmitter, 4... Demodulator, 5... Recording circuit, 6... Magnetic sheet memory, 7... Reproducing circuit , 18.19... Buffer memory, 20.21... Clock generator, 25.
...Image signal synthesis circuit, 11...TV receiver.

Claims (1)

[Claims] (1) A first storage means for storing a signal representing an image at a first resolution, a first means for reading out the signal from the first storage means, and a signal read out by the first means. a second storage means for temporarily storing the signal, a second means for reading out the signal stored in the second storage means, and a second storage means for reading out the signal stored in the second storage means; display means for displaying the same image as an image at a resolution of 2.2, and the first means performs sampling on the signal stored in the first storage means to display the same image on the first storage means. The signal when expressed in resolution is stored in the second storage means after being converted into a signal amount when expressed in the second resolution, and the second means stores the signal amount in the second storage means. An image display method characterized in that a signal is supplied to the display means in accordance with the display timing of the display means.