JPS62258573A - Receiving device for television signal - Google Patents

Abstract

PURPOSE:To prevent undesired missing of a picture signal by fixing a delay time of a memory loop by one or 2 frames so long as the picture is frozen. CONSTITUTION:The change in the delay time, that is, the position correction is applied in response to a moving vector signal from a terminal T1 in memories 10-13 to apply inter-frame interpolation processing for a picture signal subject to band compression processing by the multiplex sub-Nyquist sampling is applied. Then the output signal of the memoreis 10-13 is fed back again to an input terminal by a switch SW2 and the picture signal is controlled to be circulated in a memory loop, then the position correction of the memory by the moving vector is inhibited automatically by opening the switch SW4 in interlocking with the control. Thus, so long as the picture is frozen, since the delay time of the memory loop is fixed by one or two frames, undesired missing of the picture signal is not caused.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a television signal receiving device, and more particularly, to a television signal receiving device, in particular, it is possible to detect the amount of movement between image signals and image frames by performing band compression processing using multiple sub-Nyquist sampling. The present invention relates to a television receiver in which motion vector signals are transmitted as motion vector signals.

Conventional technology A method of reducing the signal bandwidth by sub-Nyquist sampling when transmitting a wideband image signal such as a high-definition television signal (Television Society technical report "Satellite 1-channel transmission system for high-definition television") J
TEBS95-2voe7N○44) has been proposed. This method is called a motion-compensated multiplex sub-Nyquist sampling transmission method, and it transmits image signals by applying an offset to the sampling phase between inputs and performing processing such that the sampling phase goes around in four fields. The receiving side is equipped with a frame memory to store the image signals transmitted sequentially over four fields, and combines them to restore the television image.
In the known television that performs 2:1 interlaced scanning, the above-mentioned interframe offset subsampling processing and signal restoration processing are the basics.

In a system that transmits image signals by performing inter-field and inter-frame offset subsampling processing, the decoding circuit for receiving this signal and reproducing the television image tends to be complex, and band compression processing is required. In practice, it is difficult to completely detect moving parts of an image from among the applied image signals. Therefore, it is effective to transmit an auxiliary signal to simplify the configuration of the decoding circuit, that is, a control signal for the receiving device together with the image signal. A signal is transmitted.

In order to receive the above-mentioned television signal and restore the image, it is basically necessary to arrange a frame memory in the receiving device. Missing parts can be interpolated.

The interpolation method for this missing signal is described in, for example, the Technical Report of the Television Society of Japan 1'--MUSE Method Home Video Disc J (TEBS99-4), and has a configuration as shown in FIG.

In the figure, 16.2M is supplied to the signal input terminal T1.
The BPS signal is supplied to the memory 1 via SWl and sent to the signal output terminal T2. The delay time of the memory 1 is set to one frame, and its output is supplied to the b side of the above-mentioned SWl. Normally, this SWl converts the two types of signals supplied to it at a period of 16.2MHz, that is, approximately It operates to perform interpolation processing between frames by selecting every 30 nanoseconds, thus supplying a signal of 32.4 MBPS to the signal output terminal T2 and the memory 1. on the other hand,
As described above, when a signal dropout occurs in the incoming input signal, by fixing SWl to the b side based on predetermined signal dropout information, the signal from one frame before is supplied to the memory 1 again. Therefore, interpolation of missing signals is performed. In such a configuration, it is possible to freeze the image by continuing the above-mentioned SW1 and controlling the b side to be selected.

In addition, memory 1 responds to the motion vector signal from terminal T3 so that its delay time can be changed in the vertical direction, horizontal direction, or a combination thereof. In other words, when performing interframe interpolation, the position of the signal of one frame before is corrected. It also has a function to perform.

Problems to be Solved by the Invention In the above-mentioned known receiving device, even when the SWl controls to continuously select the signal on the b side and freezes the image, the motion vector signal from the terminal T3 is stored in the memory. 1 responds, the delay time of memory 1, that is, the delay time of the loop undesirably differs. have.

Means for Solving the Problems A receiving apparatus according to the present invention includes a delay means for interframe interpolation processing, and a delay means disposed between the delay means and a signal input terminal to detect an incoming input signal and an output signal of the delay means. a signal selection means for selecting one of the motion vector signals, a signal supply means for supplying a motion vector signal to the delay means, and a control means coupled to each of the signal selection means and the signal supply means. be done.

Function: The delay means for the interframe interpolation processing described above essentially performs a four-field delay, and the interframe interpolation processing is performed between an incoming input signal and a signal one frame before this signal. Perform interpolation with . One of the signal selection means is supplied with the incoming input signal, and the other is supplied with at least the output signal of the delay means, that is, a signal that is two frames before the incoming input signal alone or a signal that includes at least the signal two frames before the incoming input signal. be done. The delay means can change the delay time in the vertical and horizontal directions of the image alone or in combination in response to a motion vector signal supplied via the signal supply means, and the signal supply means and the aforementioned signal The selection means are controlled by control means coupled to them, and when the signal selection means are controlled to successively select the output signals of the delay means, i.e. to freeze the image, the signal The supply means is controlled so as not to send out a motion vector signal, that is, to prohibit the position correction operation for the signal one frame before by the delay means.

Example Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, the incoming input signal from the signal input terminal T1 is SW
2, and its output is supplied to the memory 10 and SW
3 on the a side. This memory 1o has a delay time of approximately 1 field, and its output is sent to SW3 via a memory 11 having a delay time of approximately 1 field.
b side as well as the memory 12. The sum of the delay times of these memories 10 and 11 need only be set to one frame, and the allocation of delay times to each memory can be selected as appropriate. Memories 12 and 13 are also set to have the same delay times as 1o and 11 described above, so the output signal of memory 13 becomes a signal delayed by 4 fields, that is, 2 frames, and is supplied to the b side of SW2.

A motion vector signal is supplied to the terminal T3, and this signal is supplied to each of the aforementioned memories 11 and 13 via SW4. These memories 11 and 13 perform position correction by changing the delay time in the vertical and horizontal directions of the image, and are used to compensate for constant speed panning, tilting, etc. of the camera. Position correction is performed between frames at the output of the memory 11, and between two frames at the output of the memory 13. SW
2 is normally controlled to continuously select the a side, that is, the incoming input signal, and SW3 selects the a side approximately every 3° seconds.
It is controlled to select the side and b side signals, performs interframe interpolation processing, and sends the signal to the signal output terminal T2.

SW4 is normally shorted, and note the motion vector signal! It is supplied to each of J11 and J13, but the SW2 mentioned above
are continuously transferred to the b side, that is, to the memory 13.

When the signal is selected and controlled to be supplied to the memory 10 again, this SW4 is set to an open state and the signal is supplied to the memory 10.
The position correction operations No. 1 and No. 13 are controlled to be prohibited. Therefore, the delay time of the loop using memories 1o to 13 is fixed to 4 fields, that is, 2 frames, so the image signals for 4 fields only circulate through this loop, and no dropout of the desired signal occurs. , SWs continue the signal selection operation for the interframe interpolation process, so the still image signal is continuously sent to the signal output terminal T2. In addition, when the input signal arriving from the signal input terminal T1 has a partial signal dropout, S'W2 is controlled based on this signal dropout information, and the signal from two frames earlier supplied to the b side is used. It is of course possible to interpolate,
In this case, SW4 is maintained in a short-circuited state.

FIG. 2 shows another embodiment of the present invention, in which an incoming input signal is supplied via SWl to a memory 1J100 having a delay time of approximately one field and to a signal output terminal T2.

The output of the memory 100 is supplied to the b side of SWl via the memory 101 having a delay time of approximately one field. This SWl is normally controlled to select the a side and b side signals approximately every 30 nanoseconds, and therefore the memory 17
A signal subjected to interframe interpolation processing is supplied to 100, 101 and the signal output terminal T2.

Even in this configuration, by controlling SWl to continuously select the signal on the b side, the image can be frozen in the same manner as in FIG. 1. In this case, the motion vector signal from terminal T3 is SW4 prohibits the transmission to the memory 101, and therefore the vertical correction operation by the memory 101 is prohibited, so the delay time of the loop by the memories 100 and 101 is maintained at one frame, and as in FIG. No omissions will occur.

Effects of the Invention As described above, in the receiving apparatus according to the present invention, the memory for performing interframe interpolation processing of an image signal subjected to band compression processing by multiplex sub-Nyquist sampling includes:
The memory is configured to change the delay time in response to the motion vector signal, that is, to perform a position correction operation, and the memory is controlled so that the output signal is fed back to the input terminal so that the image signal circulates through the memory loop. Even if the motion vector signal is used, the memory position correction operation using the motion vector signal is automatically prohibited in conjunction with this control. Therefore, as long as image freezing is performed, the memory loose delay time is fixed at one or two frames, which not only prevents undesired image signal dropouts but also has great practical value, as it can be realized with an extremely simple configuration. It is something.

FIGS. 1 and 2 are diagrams of a television signal receiving apparatus according to an embodiment of the present invention, and FIG. 3 is a block diagram of a conventional television signal receiving apparatus.

10.11.12,13,100,101-...
Memory, T1...Input terminal, SW2. SW4.
SW3...Switch, T...Output terminal, T3...Terminal.

Claims (1)

[Claims] A television signal receiving device comprising at least an image signal subjected to band compression processing using multiple sub-Nyquist sampling, and a motion vector signal representing the amount of movement of the image between frames or fields of this signal. This receiving device is arranged between a predetermined delay means or storage means for frame interpolation, and between the delay means or storage means and a signal input terminal, and is arranged between the incoming input signal and the output of the delay means or storage means. signal selection means for selecting one of the signals, signal supply means for supplying the motion vector signal to the delay means or storage means, and control means coupled to each of the signal selection means and the signal supply means. and the signal supply means is configured such that the signal selection means does not substantially transmit a motion vector signal when the signal selection means is controlled by the control means to continuously select the output signal of the delay means. A television signal receiving device characterized by being controlled by.