JPH0759059B2 - Television receiver - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a so-called strobe function capable of dividing a display screen into a plurality of parts and displaying images that are slightly shifted in time in each part. The present invention relates to a television receiving device for a multiple subsample transmission signal.

2. Description of the Related Art The MUSE method has been proposed as one of methods for band-compressing a wideband video signal such as a high-definition television signal using multiple subsamples for transmission. The details are given, for example, in (NHK Technical Training [Development of MUSE Method] Vol. 39, No. 2, 1987). In the MUSE system, offset sub-sampling of a video signal is performed between fields, frames and lines, and a process in which the sampling phase makes one cycle in four fields is performed and band compression is performed. Therefore, the receiving device is provided with a frame memory, which stores video signals sequentially transmitted over four fields, and combines these to restore the original high-definition television signal.

A conventional example of a MUSE type television receiver will be described with reference to FIG.

A digitized video signal is supplied to the signal input terminal 10. In the still image processing circuit 11, inter-frame interpolation is performed using a frame memory, and then inter-field interpolation is performed to restore a still image and send it to the mixing circuit 14. On the other hand, the moving image processing circuit 12 performs field interpolation to restore the moving image and sends it to the mixing circuit 14. The motion detection circuit 13 detects a motion part using the frame correlation of the video signal, and the mixing circuit
Supply motion control signal to 14. The mixing circuit 14 mixes the output signal of the still image processing circuit 11 and the output signal of the moving image processing circuit 12 in a pixel unit at a predetermined ratio in response to the motion control signal to restore a high quality television signal. Although the output signal of the mixing circuit 14 has been restored to an image quality that is practically acceptable, the temporal circuit 15 performs processing in the time axis direction in order to further restore the image quality. The temporal circuit 15 is composed of a temporal arithmetic circuit 16 and a frame memory 17. The output signal of the mixing circuit 14 is separated into a reduction component and a high frequency component by a two-dimensional spatial filter in the temporal calculation circuit 16, and the high frequency component is a temporal low pass filter composed of the temporal calculation circuit 16 and the frame memory 17 After band limitation in the direction, the temporal operation circuit 16 combines the original reduction component and the restored high-definition television signal is obtained at the output terminal 18.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the receiving device as described above, the display screen is divided into a plurality of parts, and images which are slightly shifted in time are displayed in each part, that is, so-called strobe display cannot be performed Had the problem.

The present invention has been made in view of the above points, and an object thereof is to provide a television receiving device capable of strobe display.

Means for Solving the Problems The present invention provides a strobe screen creating circuit for generating a reduced screen signal for a strobe screen, a switch 1 for switching between a signal from a temporal arithmetic circuit and a signal from the strobe screen creating circuit, The television receiver is provided with a switch 2 for switching between a signal from a frame memory and a signal from a temporal arithmetic circuit.

Operation According to the present invention, the reduced screen signal created by the strobe screen creating circuit is sequentially stored in the frame memory through the switch 1 controlled by the strobe signal according to the above configuration. The stored video signal is repeatedly read out and sent to the output end through the switch 2 controlled by the strobe signal to obtain a strobe video signal.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. However, parts having the same operations as those shown in FIG. In order to facilitate understanding, the display screen will be divided into nine as shown in FIG. 2 and strobe display composed of nine reduced screens a to i will be described. However, the present invention is not limited to this. Is not limited to 9.

FIG. 1 is a block diagram of a television receiver according to an embodiment of the present invention. In FIG. 1, 20 is a strobe screen creating circuit that creates a reduced screen signal for a strobe screen from the output signal of the mixing circuit 14, and 21 is a temporal arithmetic circuit.
A first switch for switching the signal from 16 and the signal from the strobe screen creating circuit 20, and a second switch 22 for switching between the output signal of the frame memory 17 and the output signal of the temporal arithmetic circuit.
The switch, 23 is an input end of a strobe signal for obtaining a strobe screen.

The operation will be described below. When the strobe signal arrives at the strobe signal input terminal 23, the switches 21 and 22 are brought into the illustrated state. The output signal of the mixing circuit 14 is a strobe screen creating circuit.
At 20, a reduced screen signal for the flash screen is created. The operation of the strobe screen creating circuit 20 is to thin out every 3 pixels in the horizontal direction and every 3 lines in the vertical direction in order to obtain a 1/9 reduced screen from the output signal of the mixing circuit 14. The reduced screen signal a corresponding to a in FIG. 2 thus thinned is stored in the area corresponding to a in FIG. 2 of the frame memory 17 via the switch 21. Next, after an arbitrary fixed time t, the reduced screen signal b is stored in the area corresponding to b in FIG. 2 of the frame memory 17 by the same operation. Further, c, d, ..., I are stored in the frame memory 17 by the same operation every arbitrary fixed time t. That is, a strobe video signal composed of nine reduced screen signals is stored in the frame memory 17. The strobe video signal stored in the frame memory 17 is repeatedly read and sent to the output end 18 via the switch 22. Therefore, the strobe video signal of the restored high-definition television signal can be obtained at the output end 18. Needless to say, when the switches 21 and 22 are connected in the opposite manner to that shown in FIG. 1, the same operation as the conventional example is performed.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is not necessary to newly provide a frame memory for strobe only by adding two switches and a strobe screen creating circuit, and the circuit scale is not increased so much. , Strobe display is possible.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a television receiving apparatus according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of strobe display, and FIG. 3 is a block configuration diagram of a conventional television receiving apparatus. 11 …… Still image processing circuit, 12 …… Video processing circuit, 13 …… Motion detection circuit, 14 …… Mixing circuit, 15 …… Temporal circuit,
15 ... Temporal arithmetic circuit, 16 ... Frame memory, 20
...... Strobe screen creation circuit, 21, 22 ...... Switch, 23 ...
… Strobe signal input end.

Claims (1)

[Claims] 1. A still picture processing circuit for carrying out still picture restoration processing of a multi-subsample transmission signal, a moving picture processing circuit for carrying out moving picture restoration processing, and motion detection for detecting a moving portion by utilizing frame correlation of video signals. A circuit, a mixing circuit for controlling a mixing ratio of an output signal of the still image processing circuit and an output signal of the moving image processing circuit by a control signal from the motion detection circuit, a temporal arithmetic circuit, and a frame memory. A temporal circuit, a strobe screen creating circuit for creating a reduced screen signal for a strobe from the output signal of the mixing circuit, and a first switch for switching between the output signal of the strobe screen creating circuit and the output signal of the temporal arithmetic circuit. A second switch for switching between the output signal of the frame memory and the output signal of the temporal arithmetic circuit. Television receiver that.