JPS61289419A - Signal display device - Google Patents

Abstract

PURPOSE:To observe the input signals of a printer or the like directly to monitor them simultaneously by outputting sequential signals having a long repeating time which are the input signals of the printer or the like as simultaneous signals and displaying these outputs on a monitor. CONSTITUTION:When output pulses A, B are supplied to change-over switch circuits S1, S2 respectively and sequentially switched so as to correspond to modes shown in Table 1, R, G, B signals are outputted to three output terminals of the circuit S2. The approximately simultaneous type (field sequential type repeated for a short period) signals can be directly observed on the monitor as a color image by supplying said signals to the monitor. Thus, the input signals of the printer which are sequential signals having a long repeating time can be directly observed and approximately simultaneously displayed and monitored on the monitor.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a signal display device, and particularly to a signal display device for monitoring signals supplied to a device that inputs sequential signals such as a printer. Regarding.

(Prior Art and its Problems) Conventionally, sequential signals have been mainly supplied to printers used as computer output terminals, facsimile playback devices, and the like.

FIG. 6 is a block diagram showing an example of a transmission route for signals supplied to the printer.

In the figure, a video signal is supplied to an input terminal 10, and its three primary color signal components are processed in a color signal decomposition circuit 11.
It is decomposed into three primary color signals: signal, G signal, and B signal, and further,
These three primary color signals are subjected to signal processing such as inverse gamma correction (if the input signal has been gamma processed) and matrix processing (color reproduction correction) in the signal processing circuit 12, and then sent to each input terminal of the changeover switch circuit S. supplied to Then, these R signal, G signal, B signal (hereinafter simply R, G, B signal)
signal) is a switching signal synchronized with the printer 14.
The inputs are sequentially switched starting with the II-fold signal, and the signals are sequentially output from the output terminal of the switching switch circuit S. This sequential signal is further subjected to signal processing such as condoa processing and highlight compression in the signal processing circuit 13 and is then supplied to the printer 14.

Also, R supplied to each input terminal of the changeover switch circuit S
, G, and B signals are supplied to a monitor device (hereinafter referred to as a monitor), and these signals are displayed on the monitor.

In the signal transmission path to the printer as described above, when common signal processing is performed on each of the R, G, and B signals in order to simplify the circuit configuration, stabilize performance, and reduce variations, A signal processing circuit is inserted into a sequential signal path (in one system).

In this case, it is necessary to monitor the signal after the signal processing has been performed. This is because, by monitoring the signals on the three simultaneous signal paths of R, G, and B, it is not possible to monitor the state of the above-mentioned signal processing performed on the sequential signal path. In particular, when condoor processing (contour correction processing) is performed as signal processing in a sequential signal path, the optimal value of the condoa amount is varied and selected according to the input image @ (input signal). In this case, it is necessary (and effective) to monitor the signal after performing this signal processing.

However, the sequential signals supplied to the printer have a long repetition time (several tens of seconds) and are transmitted via a single signal line. When trying to monitor printer input signals (sequential signals), it was not possible to display the printer input signals themselves on a monitor and visually monitor them.

Therefore, conventionally, as shown in FIG. 4, R, G.

The signals at the input of the changeover switch circuit, to which eight signals are simultaneously supplied, are supplied to the monitor for monitoring.

As described above, conventionally, it has not been possible to directly view and monitor the signals actually being sent to the printer on a monitor.

On the other hand, a signal finally converted into a digital signal is supplied to the printer, and the print head is controlled by this digital signal.

However, in this regard, it has not been possible to monitor the digital signals actually being sent to the printer by directly viewing them on a monitor.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a signal display device that solves the problems of the prior art described above.

(Means for Solving the Problems) In order to achieve the above object, the present invention, as shown in FIG. A first changeover switch circuit S1 that sequentially switches the component signals by a switching v control signal synchronized with the synchronization signal of the video signal and outputs them as sequential signals; and a sequential signal outputted from the first changeover switch circuit S1 is supplied. and a second changeover switch circuit S2 which switches the sequential signals in conjunction with the first changeover switch circuit S1 and outputs a plurality of component signals constituting the simultaneous signal as simultaneous signals from each of the plurality of output terminals. The present invention provides a signal display device characterized in that it is configured to display simultaneous signals outputted from the second changeover switch circuit S2.

(Function) In the signal display device having the above configuration, the sequential signal outputted from the first changeover switch circuit S1 to which the simultaneous signals are supplied is converted into a second simultaneous signal consisting of the component signals constituting the sequential signal. output from the changeover switch circuit S2,
Using this output signal, a signal having the same form as the simultaneous signal supplied to the input terminal of the first changeover switch circuit S1 can be displayed.

(Example) Next, regarding an example of the signal display device according to the present invention,
This will be explained below along with the drawings.

FIG. 1 is a block diagram showing an embodiment of a signal display device according to the present invention.

In the figure, the changeover switch circuit S1 is composed of, for example, an analog multiplexer, and its three input terminals have R, G, and
m signals are respectively supplied.

The inputs of this changeover switch circuit S1 are sequentially switched according to a changeover υ[image signal, which will be described later, and signals are sequentially outputted from its output terminal. After this sequential signal is subjected to signal processing such as condoor processing and highlight compression in the signal processing circuit 1, it is supplied to the printer 2, while this sequential signal is also supplied to the input terminal of the changeover switch circuit S2.

The changeover switch circuit S2 is composed of, for example, an analog multiplexer, and input signals are sequentially changed over by a changeover control signal, which will be described later. m signals are output respectively.

After the R, G, and m signals are each amplified via the amplifier 3, these R, G, and m signals are supplied to the monitor as substantially simultaneous signals (in this embodiment, three systems of field sequential signals). be done. That is, the R, G, and m signals supplied to this monitor have substantially the same form as the signal supplied to the input terminal of the changeover switch circuit $1.

Here, changeover switch circuit S1. The switching control signal supplied to S2 will be explained.

This switching &lI wJ multiplied signal is supplied from the printer 2 or the oscillator 4 via the changeover switch S3.

The oscillator 4 oscillates and outputs a signal synchronized with the vertical drive pulse (VD), which is transmitted to the changeover switch circuit 31. through the changeover switch $3. S2 respectively.

In addition, the changeover switch circuit S1. S2 can be switched in correspondence with each color selection, and can be switched in the modes shown in Table 1, for example.

Table 1 That is, the printer 2 or the oscillator 4 inputs the vertical drive pulse L(VD> as shown in FIG. It outputs a frequency pulse A (output pulse A is shown in Fig. 3).Furthermore, the output of the blue splitter 5 is passed through a phase shifter 6, so that the phase difference (delay) of one vertical period (1v) is changed. (The output pulse B is shown in FIG. 3.) Therefore, the output pulses A and B become the switching t, lI m signals corresponding to Table 1.

The output pulses A and 8 shown in FIG. 3 are transferred to the selector switch circuit S1. S2 respectively and are switched sequentially to correspond to the modes shown in Table 1, the three output terminals of the changeover switch circuit S2 receive R, G, and m signals as shown in FIG. 4, respectively. can get. And this near-simultaneous (i.e. short-time repeating field-sequential)
By supplying this signal to Tanabata, it is possible to directly view a color image on a monitor.

As described above, it is possible to directly view the printer's input signal, which is a sequential signal with a long repetition time.
It becomes possible to display and monitor on a monitor using a field sequential method that repeats over a short period of time.

Furthermore, the almost simultaneous signals as shown in FIG.
, G, and B signals and then output them, it is possible to obtain a simultaneous signal having exactly the same form as the simultaneous signal supplied to the changeover switch circuit S1 in FIG. 1.

On the other hand, as described above, the printer is supplied with a signal that is finally converted into a digital signal, and the print head is controlled by this digital signal.

However, in this case, it was not possible to directly view and monitor the digital signals actually being sent to the printer on a monitor.

Next, an embodiment will be described in which this problem is solved and the digital signals supplied to the printer can be monitored. FIG. 5 is a block diagram showing another embodiment of the signal display device according to the present invention. In this figure, the same components as those in FIG.

As shown in the figure, the sequential signals output from the signal processing circuit 1 are A/D converted! ! 1! The analog signal is converted into a digital signal by the converter 7, and this digital signal is supplied to the printer 2. Note that, if necessary, a signal processing circuit 8 is inserted on the output side of the A/D converter 7, and the output digital signal of the A/D converter 7 is subjected to condoa processing, highlight compression, etc. The signal is digitally processed and supplied to the printer 2.

Furthermore, the digital signal supplied to the printer 2 is a D/A
The signal is also supplied to the converter 9, where the digital signal is converted into an analog signal by the D/A converter 9, and this analog signal is supplied to the changeover switch circuit S2.

Then, in the same manner as in the embodiment described above, the changeover switch circuit S2 sequentially performs the following operations in response to a changeover control signal supplied from the oscillator 4 or the printer 2 via the changeover switch S3.
The input signal is switched, and the R9G and B signals constituting the signal are sequentially output from the three output terminals.

After the RlG and B signals are each amplified via the amplifier 33, these R, G, and B signals are supplied to the monitor as substantially simultaneous signals.

In this case as well, as described above, simultaneous signals can be obtained by storing each R, G, and B signal once in memory and then outputting it.

As described above, it becomes possible to monitor the signal at the point where it is digitized immediately before being supplied to the printer, and it becomes possible to monitor the signal at a point closer to the final system of the signal supplied to the printer.

Note that in the above embodiment, the changeover switch circuit S1. S2
Although the field sequential type signal is obtained by switching with the vertical drive pulse (VD), the present invention is not limited to this, and is configured to switch this with the horizontal drive pulse (HD) to obtain the line sequential type signal. It's okay.

(Effects of the Invention) As described above, according to the signal display device of the present invention, a sequential signal having a long repetition time, which is an input signal of a printer, etc., is outputted as a simultaneous signal consisting of component signals constituting this sequential signal, It has the advantage of being able to display this on a monitor, allowing it to be viewed directly and monitored.

[Brief explanation of the drawing]

FIG. 1 is a block system diagram showing an embodiment of the signal display device according to the present invention, FIG. 2 is a block system diagram for explaining the configuration of the signal display device according to the present invention, and FIGS. 3 and 4 is a signal waveform diagram for explaining the operation of the signal display device according to the present invention, FIG. 5 is a block system diagram showing another embodiment of the signal display device according to the present invention, and FIG. 6 is an example of a conventional signal display device. FIG. DESCRIPTION OF SYMBOLS 1... Signal processing circuit, 2... Printer, 3... Amplifier, 4... Oscillator, 5... Kiyoshi frequency divider, 6... Phase shifter, Sl, 82... Switching Switch circuit, S3... changeover switch. ;ljl',>. □-+,,lli 2, 14 ninri! =゛b 1st review 2 η OI O sai 3 Kiseiyoki 76 Written amendment of the procedure September 10, 1985 Patent application No. 131513 of 1985 2, Title of invention signal display device 3, Make amendments Patent applicant address: 3-12 Moriya-cho, Kanayō-ku, Yokohama-shi, Kanagawa Prefecture Voluntary amendment 5, Claims column and Detailed explanation of the invention column 6 of the amended counter-staining specification, Amendment Contents (1) The claims of the specification are amended as shown in the attached sheet. (2) Delete "the above" from page 5, line 13 of the specification. Attached claim: ``A plurality of component signals constituting a simultaneous signal are supplied to each of a plurality of input terminals, and the component signals are sequentially switched by a switching control signal synchronized with the synchronization signal of the image signal and output as sequential signals. a first changeover switch circuit; and a sequential signal output from the first changeover switch circuit is supplied, and the sequential signal is switched in conjunction with the first changeover switch circuit to form the simultaneous signal. and a second changeover switch circuit that outputs a plurality of component signals as simultaneous signals from each of the plurality of output terminals, and is configured to display the simultaneous signals output from the second changeover switch circuit. Signal display device.”

Claims (1)

[Claims] A plurality of component signals constituting a simultaneous signal are supplied to each of a plurality of input terminals, and the component signals are sequentially switched by a switching control signal synchronized with a synchronization signal of the video signal and output as sequential signals. A first changeover switch circuit, a sequential signal output from the first changeover switch circuit is supplied, and this sequential signal is switched in conjunction with the first changeover switch circuit to generate a plurality of simultaneous signals. and a second changeover switch circuit that outputs the component signals as simultaneous signals from each of a plurality of output terminals, and is configured to display the simultaneous signals output from the second changeover switch circuit. Device.