JPH0454080A - Picture transmission receiver - Google Patents

Abstract

PURPOSE:To reduce the scale of the system by using D/A converter circuits of a number corresponding to number of still picture signals and moving picture signals subject to digital multiplexing so as to apply D/A conversion to the moving and still picture signals. CONSTITUTION:When a digital multiplexing transmission data (a) is inputted, a separation circuit 1 separates the transmission data (a) into a moving picture signal (b) and a still picture signal (c) for two patterns A, B and still picture presence information (d) and they are outputted. A picture separation circuit 2 separates the patterns A, B of the moving picture signal of one pattern when the still picture presence information (d) represents absence, the moving picture signal of the pattern A is outputted as a picture signal (e) from a 1st output terminal 2a and the moving picture signal of the pattern B is outputted as a picture signal (f) from a 2nd output terminal 2b. Moreover, when the still picture presence information (d) represents presence, the moving picture signal (b) by two patterns is not separated and outputted from the 1st output terminal 2a as the picture signal (e), while the still picture signal (c) is outputted from the 2nd output terminal b2 as the picture signal (f).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a receiving device for an image transmission device having both a digital transmission function of moving image signals and still image signals.

[Conventional technology]

Conventionally, this type of image transmission/reception device includes a separation circuit 21 and three D/A circuits 22, 23, 2, as shown in FIG.
5, a frame memory 24, and monitors 26-28.

In this image transmission/reception device, transmission data n obtained by digitally multiplexing moving image signals and still image signals of two screens A and B as shown in FIG. 6 is input to the separation circuit 21. The moving image signal p for the B screen, the moving image signal q1 for the B screen, and the still image signal O are respectively separated and output. The moving image signal p outputted from the separation circuit 21 is converted into an analog television signal S by a D/A (digital/analog conversion circuit) 22, and the moving image signal q is converted into an analog television signal S by a D/A (digital/analog conversion circuit) 22.
3 into an analog television signal t. The still image signal ○ is temporarily stored in the frame memory 24, and one frame of the still image signal r is repeatedly output until the next new still image signal 0 is input.

This still image signal r is converted into an analog television signal U by a D/A conversion circuit 25 and output. D/A conversion circuit 22, D/A conversion circuit 23, D/A conversion circuit 24
Analog television signal 5StS converted and output from
u is output to monitor 26, monitor 27, and monitor 28, respectively. Figures 4(a) and 4(b) show each monitor 26 to 28.
FIG. 5(a) shows the case where there is no still image, and FIG. 2(b) shows the case where there is a still image.

[Problem to be solved by the invention]

In the conventional image transmission/reception device as described above, three D/A conversion circuits 22 to 24 and three monitors 26 to 28 are required depending on the number of moving image signals and still image signals.
Therefore, there was a problem that the system scale became large.

The present invention has been made in view of these problems, and an object of the present invention is to provide an image transmission/reception device that can reduce the number of D/A conversion circuits and monitors and reduce the system scale.

[Means to solve the problem]

The image transmission/reception device according to the present invention inputs transmission data in which a moving image signal of a plurality of screens, a still image signal, and still unique information indicating the presence or absence of the still image signal are digitally multiplexed. a separating circuit that separates and outputs the moving image signal, the still image signal, and the static specific non-information, respectively; receiving the moving image signal, the still image signal, and the static specific non-information of the plurality of screens; It has the same number of output terminals as the number of moving image signals, and when the static specific non-information is absent, the moving image signals of the plurality of screens are separated for each screen and outputted to the output terminals, respectively. an image separation circuit that outputs the still image signal to one output terminal among the front output terminals when the information is present, and outputs the moving image signals of the plurality of screens to another output terminal; A plurality of D/A conversion circuits are provided corresponding to each of the output terminals and convert the output signal of each output terminal into an analog signal and output the analog signal.

Further, the image transmission/reception device of the present invention receives as input transmission data in which a moving image signal of two screens, a still image signal, and still unique information indicating the presence or absence of the still image signal are digitally multiplexed. a separation circuit that separates and outputs the moving image signal, the still image signal, and the static specific non-information, respectively; 1 output terminal and a second output terminal, and when the static unique non-information is absent, the moving image signals of the two screens are separated for each screen, and the moving image signal of one screen is outputted as the first output terminal. output to the terminal and also output the moving image signal of the other screen to the second output terminal,
On the other hand, an image separation circuit outputs the moving image signals of the two screens to a first output terminal without separating them when the static unique non-information is present, and outputs the still image signals to a second output terminal; a first D/A conversion circuit that converts the output signal of the first output terminal of the image separation circuit into an analog signal and outputs the same; and a first D/A conversion circuit that converts the output signal of the second output terminal of the image separation circuit into an analog signal. and a second D/A conversion circuit that outputs the same.

Furthermore, in the image transmission/reception device of the present invention, the image separation circuit writes still image information when the static unique non-information is present, and repeats the written still image information when the static unique non-information is absent. a frame memory for reading and outputting a still image signal; a control signal generation circuit for outputting a control signal for separating the moving image signals of the two screens for each screen; a first selection circuit that receives the control signal and separates and outputs the moving image signal of one screen;
a second selection circuit which inputs the moving image signal of the screen and the fixed pattern and separates and outputs the moving image signal of the other screen in response to the control signal; A set circuit that outputs a switching signal while turning on a switching signal when the switching signal is on, and inputs a moving image signal of one screen and a moving image signal of two screens, and outputs a moving image signal of two screens when the switching signal is on. a third selection circuit which outputs the image signal from the first output terminal when the switching signal is off, and the moving image signal of one screen from the first output terminal, and the moving image signal and still image signal of the other screen; A fourth selection circuit outputs a still image signal from the second image terminal when the switching signal is on, and outputs a moving image signal of the other screen when the switching signal is off.

With such a configuration, the image transmission/reception device of the present invention has the following features:
The number of D/A conversion circuits and monitors can be reduced by the number of still image signals, and the system scale can be reduced.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an image transmission/reception apparatus according to an embodiment of the present invention. This image transmission/reception device includes a separation circuit 1, an image separation circuit 2, and two D/A
It consists of a conversion circuit 3.4 and two monitors 5.6. The separation circuit 1 inputs to an input terminal 7 transmission data a in which moving image signals of two screens A and B, a still image signal, and static unique information indicating the presence or absence of the still image signal are digitally multiplexed. Transmission data a is separated into moving image signals of two screens A and B, a still image signal C, and static specific non-information d, and then output. The image separation circuit 2 inputs the two-screen moving image signal output from the separation circuit 1, the still image signal C, and the static specific non-information d, and when the static specific non-information d is empty, the two-screen moving image signal C and the static specific non-information d are input. Separate the A screen and the 8th screen of the moving image signal, output the moving image signal of the 1st screen from one output terminal 2a as the image signal e, and output the moving image signal of the 8th screen as the image signal f from the other output terminal 2b. It is something to do. In addition, when the static specific non-information is present, the moving image signals of two screens are outputted as the image signal e from the first output terminal 2a without being separated, and the still image signal C is outputted as the image signal f as the second image signal. It is output from the output terminal 2b.

Further, the D/A conversion circuit 3 inputs the image signal e, converts it into an analog television signal g, and outputs the analog television signal g.
The conversion circuit 4 receives the image signal f, converts it into an analog television signal, and outputs the converted signal. The monitor 5 inputs the analog television signal g1, and the monitor 6 inputs the analog television signal. Eight screens of moving image signals are projected on the top, and when static unique information e is present, two screens of moving image signals are projected on the screen of monitor 5, and a still image is projected on the screen of monitor 6. ing.

With such a configuration, in the image transmission/reception apparatus of this embodiment, when digitally multiplexed transmission data a as shown in FIG. 7 is input to the input terminal 7, the separation circuit 1 separates the transmission data a. Then, the moving image signals of the two screens A and B are separated into a still image signal C and static unique information d and output. The separated two-screen moving image signal C, still image signal C, and still unique non-information d are input to the image separation circuit 2, respectively. The image separation circuit 2 separates the first screen and the eighth screen of the two-screen moving image signal when the static specific non-information d is empty,
The moving image signal of the 8 screens is outputted from the first output terminal 2a as the image signal e, and the moving image signal of the 8 screens is outputted as the image signal f.
It is outputted from the second output terminal 2b as follows.

In addition, when the static specific non-information d is present, the moving image signal of the two screens is not separated and is output as the image signal e to the first output terminal 2.
On the other hand, the still image signal C is output as an image signal f from the second output terminal 2b.

The image signal e is input to the D/A conversion circuit 3, subjected to D/A conversion, and then output as an analog television signal g. Further, the image signal f is input to the D/A conversion circuit 4,
After being D/A converted, it is output as an analog television signal. The analog television signal g is input to the monitor 5, and the analog television signal g is input to the monitor 6. Here, when the static specific non-information d is null, a moving image of one screen is outputted on the screen of the monitor 5, and a moving image of eight screens is outputted on the screen of the monitor 6. An example of the output on the monitor 5.6 at this time is shown in FIG. 5(a). Further, when the static specific non-information e is present, two moving images are output on the screen of the monitor 5, and a still image is output on the screen of the monitor 6. The output example on the monitor 5.6 at this time is shown in the 5th page.
Shown in Figure (b).

FIG. 2 is a block diagram showing details of the image separation circuit 2 of FIG. 1. This image separation circuit 2 includes a frame memory 1
1, selection circuits 12 and 13, control signal generation circuit 14, set circuit 15, and selection circuits 16 and 17.

The frame memory 11 writes a still image signal C when the static unique non-information d is present, and repeatedly reads out the still image data written in the memory when the static unique non-information d is absent, and generates a static regular image signal. It outputs l.

Further, the control signal generating circuit 14 outputs a control signal j for separating the A screen and the 8th screen from the moving image signals of the two screens. The selection circuit 12 receives the two-screen moving image signal (1) and the fixed pattern signal (W), receives the control signal J, and separates and outputs the two-screen moving image signal (k). On the other hand, the selection circuit 13 inputs the two-screen moving image signal and the fixed pattern signal W, receives the control signal j, and selects the
It separates and outputs the moving image signal 1 of the screen. The set circuit 15 turns off the switching signal m when the static unique non-information d is absent, and when the static unique non-information d becomes present, the switching signal m
is set to be fixed on and output. Further, the selection circuit 16 inputs the moving image signal of screen A and the moving image signal of two screens, and outputs the image signal of two screens as image signal e when the switching signal m is on, and also outputs the image signal of two screens as the image signal e. When the signal m is off, the moving image signal k of the screen is converted to the image signal e.
This is what is output as. The selection circuit 17 inputs a moving image signal 1 and a still image signal 1 of eight screens, and receives a switching signal m.
When the switch signal m is on, the still image signal l is output as the image signal f, and when the switching signal m is off, the moving image signal 1 of eight screens is output as the image signal f.

That is, in this image separation circuit 2, when the static specific non-information d is present, the frame memory 11 writes the still image signal C, whereas when the static specific non-information d is non-existent, the frame memory 11 writes the still image signal C into the memory. The written still image information is repeatedly read out and a still image signal i is output.

On the other hand, the control signal generation circuit 14 outputs a control signal j to the selection circuit 12.13 for separating the A screen and the 8th screen from the two screens of moving image signals. In response to this control signal K, the selection circuit 12 separates and outputs the moving image signal k of the A screen from the input moving image signals W of the two screens and the fixed pattern signal W. On the other hand, the selection circuit 13 separates and outputs eight screens of moving image signals l out of the input two screens of moving image signals and fixed pattern signal W. When the static unique non-information d is present, the set circuit 15 fixes the switching signal m on and outputs it. When this switching signal m turns on, the selection circuit 16
Among the moving image signals of the screen and the moving image signals of the two screens, the image signal (i) is output as an image signal e. On the other hand, selection circuit 1
7 outputs the still image signal i out of the moving image signal l and the still image signal 1 of eight screens as the image signal f. Further, when the stationary unique null information d becomes null, the set circuit 15 turns off the switching signal m.

At this time, the selection circuit 16 outputs the moving image signal k of the screen as the image signal e from the first output terminal 2a between the moving image signal of the A screen and the moving image signal of the two screens. On the other hand, the selection circuit 17 outputs the moving image signal 1 of eight screens out of the moving image signal 1 of eight screens and the still image signal i as an image signal f from the second output terminal 2b.

In this way, in the image transmission/reception device of this embodiment, when the static unique non-information d is null, the moving image signals of the A18 screen are outputted separately from the first output terminal 2as and the second output terminal 2b, On the other hand, when the static specific non-information d is present, the still image signal is output from the second output terminal 2b, and the moving image signal is not separated (from the first output terminal 2b).
Since the output is output from a, the D/A conversion circuit 3.4
The monitors 5 and 6 need only have the number of moving image signals. Therefore, compared to conventional image transmission and reception devices,
One D/A conversion circuit and one monitor for moving image signals are no longer required, and the system scale can be reduced.

Although the present invention has been described above with reference to Examples, the present invention is not limited thereto, and can be modified in various ways without changing the gist thereof. For example, in the above embodiment,
Two types of moving image signals for two screens A and B are input as transmission data and displayed on these two monitors 5.6, but this is more than three types digitally multiplexed with still image signals. Input the video signal of
A configuration may be adopted in which D/A conversion is performed by D/A conversion circuits corresponding to the number of moving image signals, and moving images and still images are displayed using the same number of monitors.

〔Effect of the invention〕

As described above, according to the image transmission/reception apparatus according to claims 1 and 2, the number of D/A conversion circuits corresponding to the number of moving image signals digitally multiplexed together with the still image signal is used to convert the moving image signal and the still image signal. D/A conversion circuit for moving image signals, compared to conventional D/A conversion circuits.
Furthermore, the number of monitors can be reduced, which has the effect of reducing the system scale.

Further, according to the image transmission/reception device according to the third aspect, the image separation circuit according to the first or second aspect can be realized with a simple circuit configuration.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the circuit configuration of an image transmission/reception device according to an embodiment of the present invention, FIG. 2 is a block diagram specifically showing the image separation circuit of FIG. 1, and FIG. 3 is a block diagram showing a conventional image separation circuit. A block diagram showing the circuit configuration of the transmission/reception device, FIG. 4 is a diagram showing an example of monitor output in the conventional image transmission/reception device, and FIG. 5 is a diagram showing an example of monitor output in the image transmission/reception device of the present invention. FIG. 6 is an operation timing diagram of the conventional image transmission/reception apparatus, and FIG. 7 is an operation timing diagram of the image transmission/reception apparatus of the present invention. 1... Separation circuit, 2... Image separation circuit, 3.4... D/A conversion circuit, 5.6... Monitor, 7... ...Input terminal, 11...Frame memory, 12.13.16.17...Selection circuit, 14.
... Control signal generation circuit, 15 ... Set circuit. Applicant NEC Corporation Agent Patent Attorney Umeo Yamauchi Figure 4 Figure 5

Claims (1)

[Claims] 1. Transmission data in which a moving image signal of a plurality of screens, a still image signal, and still image presence/absence information indicating the presence or absence of the still image signal are digitally multiplexed is input, and the moving image of the plurality of screens is transmitted. a separation circuit that separates and outputs the still image signal, the still image signal, and the still image presence/absence information; It has the same number of output terminals as the number of signals, and when the still image presence/absence information is absent, the moving image signals of the plurality of screens are separated for each screen and outputted to the output terminals respectively, while the still image presence/absence information is an image separation circuit that outputs the still image signal to one output terminal of the front output terminals and outputs the moving image signals of the plurality of screens to another output terminal when the image separation circuit has an output terminal; and an output terminal of the image separation circuit. An image transmission/reception device comprising: a plurality of D/A conversion circuits provided corresponding to each of the output terminals, and converting the output signal of each output terminal into an analog signal and outputting the analog signal. 2. Transmission data in which a moving image signal of two screens, a still image signal, and still image presence/absence information indicating the presence or absence of the still image signal are digitally multiplexed is input, and the moving image signal of the two screens and the still image signal are transmitted. a separation circuit that separates and outputs the static specific non-information and the still image information; and a separation circuit that receives the moving image signal of the two screens, the still image signal, and the still image presence/absence information, and has a first output terminal and a second output. terminal, and when the still image presence/absence information is absent, the moving image signals of the two screens are separated for each screen, and the moving image signal of one screen is output to the first output terminal, and the moving image signal of the other screen is output. The moving image signal is outputted to the second output terminal, and when the still image presence/absence information is present, the moving image signals of the two screens are outputted to the first output terminal without being separated, and the still image signal is outputted to the first output terminal. a first D/A conversion circuit that converts an output signal of the first output terminal of the image separation circuit into an analog signal and outputs the analog signal; An image transmission/reception device comprising: a second D/A conversion circuit that converts the output signal of the second output terminal into an analog signal and outputs the analog signal. 3. A frame in which the image separation circuit writes still image information when the still image presence/absence information is present, and repeatedly reads the written still image information when the still image presence/absence information is absent, and outputs a still image signal. a memory; a control signal generation circuit that outputs a control signal for separating the moving image signals of the two screens for each screen; and a control signal generating circuit that inputs the moving image signals of the two screens and a fixed pattern, receives the control signal, a first selection circuit that separates and outputs the moving image signal of the other screen; and a second selection circuit that receives the moving image signal of the two screens and the fixed pattern and receives the control signal and separates and outputs the moving image signal of the other screen. a selection circuit that outputs a switching signal as OFF when the still image presence/absence information is absent, and outputs a switching signal as ON when the still image presence/absence information is present; A third selection that inputs a moving image signal and outputs the moving image signal of two screens from the second output terminal when the switching signal is on, and the moving image signal of one screen when the switching signal is off. circuit, and a moving image signal and a still image signal from the other screen as inputs,
3. A fourth selection circuit configured to output a still image signal from the second output terminal when the switching signal is on and a moving image signal of the other screen when the switching signal is off. Image transmission and reception device.