JPS5912677A - Television receiver - Google Patents

Abstract

PURPOSE:To attain the receiving of a screen with high quality and compatible with the current system, by increasing the number of scanning lines per field. CONSTITUTION:A signal received at a receiving circuit 11 is detected at a detecting circuit 12 and applied to a memory circuit 13. Further, a signal from the circuit 12 is applied to a synchronizing separation circuit 14, and a separated synchronizing signal is applied to an address control circuit 15. Then, this address signal is applied to the circuit 13. When the storage capacity for one field share (current system) is provided to the circuit 13, the signal from the circuit 12 and the signal of one preceding field are synthesized to form a signal having double horizontal scanning lines. This signal is applied to a picture tube 17. Further, the signal from the circuit 14 is applied to a deflecting circuit 18 to form a deflecting signal for doubled horizontal frequency number while the vertical frequency remains separated and the signal is applied to the picture receiving tube 17. Thus, the picture having the double horizontal scanning lines are displayed on the picture receiving tube 17, allowing to obtain a picture with high quality.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a television receiver that is compatible with current systems and capable of receiving high quality screens.

BACKGROUND ART AND PROBLEMS There has been proposed a so-called high-definition television that doubles the number of horizontal scanning lines and doubles the horizontal resolution. However, such high-definition television is not only incompatible with current television systems, but also requires revisions to broadcasting equipment and channel plans as the video frequency quadruples, making it difficult to put it into practical use. Ingredients.

OBJECTS OF THE INVENTION In view of the above-mentioned points, the present invention is intended to be compatible with the current system and to enable high-quality screen reception.

Summary of the Invention The present invention reduces the number of scanning lines per field for image signals obtained at the same time, receives a television signal transmitted over n fields, and transmits the signal over the n fields. A television receiver characterized by increasing the number of scanning lines per field by combining using a delay memory within n-1 fields, which is compatible with the current system. Therefore, it is possible to receive a high-quality screen.

Example First, the transmitting side device will be explained with reference to FIGS. 1 and 2.

In FIG. 1, (1) indicates a television camera. This camera (1) is, for example, a so-called high-definition television camera that has twice the number of horizontal scanning lines and doubles the horizontal resolution, and has a video signal band four times as large as the current one.

A signal from this camera (1) is supplied to a memory circuit (2) having a storage capacity for, for example, one field (four times the current capacity). In addition, a vertical synchronization signal and a horizontal synchronization signal with twice the frequency from the synchronization generator (3) are supplied to the camera (1), and these synchronization signals are used as a timing generator including a 4-frequency divider circuit for the vertical synchronization signal. The signal from the generator (4) is supplied to the address control circuit (5). This address signal is then supplied to the memory circuit (2).

Here, an image as shown in FIG. 2A is supplied to an arbitrary field F1 from the camera (1) to the memory circuit (2) and stored therein. Reading from this memory is performed in relation to the current vertical and horizontal frequencies, and as shown in FIG. The signal is taken out, the signal marked with (x) is taken out in field F3, and the signal marked with (b) is taken out in field F4. Here fields F1 and F3. The F2 and F4 screens are horizontally interleaved (dot interleaved). Note that each signal is extracted so that the time axis is expanded twice. Further, reading of field F1 is started substantially simultaneously with writing at the beginning of each horizontal period, and is taken out so that the time axis is doubled. Further, the signal may be extracted as shown in FIG. 2C.

Therefore, a signal of the same video signal band as the current one is extracted from the memory circuit (2) with the same number of horizontal scanning lines and horizontal resolution as the current one. This signal is the current modulation circuit (6)
, is transmitted through the transmitting circuit (7).

This transmission signal is line-interlaced with odd and even fields, and is equivalent to the current signal, so it can be received by current television receivers as is. In other words, this signal is compatible with the current system.

A television receiver such as the one shown below is used to receive the signals transmitted by Jin.

In FIG. 3, a signal received by a receiving circuit (11) is detected by a detection circuit 0 and supplied to a memory circuit a3. In addition, the signal from the detection circuit a2 is sent to the synchronous separation circuit (14).
The separated synchronization signal is supplied to the address control circuit (
15). This address signal is then supplied to 'memory circuit 0□□□.

Here, No. 1 is taken out from the detection circuit 02 as shown in FIG. 4A. If the memory circuit has a storage capacity for one field (currently), then the memory circuit shown in Fig. 4B
As shown in the figure, the signal from the detection circuit 02 and the signal from one field before are combined to form a signal with twice the number of horizontal scanning lines.

This signal is sent to the picture tube aη through the video output circuit (1119).
supplied to Further, the signal from the synchronization separation circuit 04) is supplied to a deflection circuit (I), and while the vertical frequency is separated, a deflection signal whose horizontal frequency is doubled is formed and supplied to the picture tube 07).

Therefore, an image with twice the number of horizontal scanning lines is displayed on the picture tube αD, and a high-quality image can be obtained.

Note that when the horizontal frequency is doubled as described above, it is necessary to time-axis compress the video signal to 7.

Alternatively, two electron beams may be used to simultaneously project two horizontal scanning lines without increasing the horizontal frequency.

Further, when the memory circuit (13) has a storage capacity for two fields, fields F1 and F2. F3 and F4. The signals of F5 and F6... are combined into a set, and this is repeatedly extracted twice. This also forms a signal with twice the number of horizontal scanning lines. The rest is the same as in the case of FIG. 4B described above. Note that in this case, screen distortion caused by combining signals at different times in field F5 in case B does not occur.

Furthermore, if the 0th floor memory circuit has a storage capacity for 3 fields, fields F1 to F4. F2-F5. The signals of F3 to F6, . . . are combined to form a signal with twice the number of horizontal scanning lines and twice the horizontal resolution. Therefore, in this case, an extremely high quality image can be obtained. In this case, the write-in W and read-out R of the 3-field memories [1], [2], and [3] are in the fifth field.
This is carried out as shown in the figure, and the signals read from each memory and the detection output at that time are combined.

In this way, it is possible to receive high-quality images that are compatible with current systems.

By providing a storage capacity for 6 fields as the 0th floor of the memory circuit, signals can be synthesized as shown in Fig. 4E, but this method requires too large a memory capacity. Not realistic.

By the way, in the above-mentioned apparatus, one screen is formed by four fields, that is, when applied to the NTSC system, for example, the number of screens is 15 per second. For this reason, some flickering occurs on the screen when a fast-moving subject is photographed. On the other hand, it is known that when the subject moves quickly, there is no problem even if the screen resolution deteriorates.

Therefore, on the transmitting side, when the subject is moving slowly, images are taken every 4 fields as shown in FIG. 6A, and when it is fast, images are taken every 2 fields as shown in B. In either case, the signal transmitted at this time is as shown in FIG. 6C. Further, a control signal 81 #82 indicating whether the photographing was performed at A or B is superimposed on this transmission signal and transmitted. Then, at the receiver, the control signal S1. S2 is detected, and in response to this control signal, the image receiving system is switched to the image receiving system shown in FIG. 4C and I) to perform image reception.

In this way, a high-quality image can be obtained when the subject is moving slowly, and a flicker-free screen can be displayed even when the subject is moving quickly.

Furthermore, if the subject is moving more rapidly, it is also possible to photograph every field and directly extract a signal as shown in FIG. 6C. In this case, the receiver uses the control signal S3 to
The system should be able to perform reception equivalent to the current receiver. In this case, the number of scanning lines may be made equal to that described above by displaying the same horizontal scanning line twice.

In other words, as shown in FIG.
Photographing is performed every 4 fields, every 2 fields, and every field, and the signals are divided into 4 fields and 2 fields, or taken out for each field, and the control signals Sl, S2 . S3
are superimposed and transmitted. Then, at the receiver, the control signal 81. At S2, 4 fields and 2 fields are combined and displayed four times and two times, respectively, and when the control signal is 83, every field is displayed.

In this way, it is possible to perform high-quality reception that is compatible with fast movements.

Effects of the Invention According to the present invention, a high-quality screen can be received that is compatible with the current system.

Brief explanation of the drawings 4 Figures 1 and 2 are diagrams for explaining the transmitting side equipment, Figure 3
The figure is a configuration diagram of an example of the present invention, and FIGS. 4 to 7 are diagrams for explaining the same.

0υ is a tuner, a2 is a video detection circuit, 03) is a memory circuit, θ is a synchronous separation circuit, α is an address control circuit,
06) is a video output circuit, α power is a picture tube, and 0tsuchi is a deflection circuit.

Figure 3 Figure 2 A B 4th door A B CD
E Figure 4c Mackerel A B CD
F.

5th cause Figure 6 1 'F/ 10Xo-x.

Claims (1)

[Claims] The image signals obtained at the same time are reduced in the number of scanning lines per field, the television signal transmitted over n fields is received, and the signal over the n fields is transmitted within n-1 fields. A television receiver characterized in that the number of scanning lines in a field is increased by synthesis using a delay memory.