JPH05145868A - Television receiver with ghost elimination device - Google Patents

Abstract

PURPOSE:To easily confirm the ghost elimination effect by simultaneously displaying the video before and after ghost elimination. CONSTITUTION:A television signal is demodulated by a video intermediate frequency(VIF) demodulator 3 and inputted to a picture-in-picture(PIP) circuit 11. A ghost signal is falsely removed by a ghost elimination device 5 by the operation if a changeover switch 4 or inputted to the PIP circuit 11 through the changeover switch 4 as it is. When the PIP circuit 11 is not operated, the video signal from the changeover switch 4 is displayed on the display screen through a video signal processing circuit 6 and the video before and after ghost elimination is displayed on the entire screen. When the PIP circuit 11 is operated through a control circuit 7 by the operation of a key operation part 8, the video signal of the ghost elimination part is displayed as a slave screen on one part of the display screen. A signal inputted from the changeover switch 4 is displayed on the part except the slave screen of the display screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver with a ghost eliminating device.

[0002]

2. Description of the Related Art At present, there is no television receiver incorporating a ghost eliminating device, but a schematic configuration of a television receiver with a ghost eliminating device which is usually considered is shown in FIG. In FIG. 2, 1 is an antenna, 2 is a tuner, and 3
Is a VIF (video intermediate frequency) demodulator, 4 is a changeover switch,
Reference numeral 5 is a ghost elimination device, 6 is a video signal processing circuit, 7 is a control circuit, and 8 is a key operation unit.

Next, the operation will be described. Antenna 1
The TV signal received at is selected by tuner 2 and
The signal is sent to the F demodulator 3 and demodulated to obtain a baseband signal. This signal is sent to the ghost elimination device 5, and the ghost signal is eliminated in a pseudo manner. The change-over switch 4 turns on / off the ghost removing function. That is, when the ghost is to be removed, the changeover switch 4 is connected to the terminal b side to select the signal from which the ghost is removed, and when it is desired to confirm the image before the ghost is removed, the changeover switch 4 is connected to the terminal a side. The user can operate the key operation unit 8 to give a command to the control circuit 7 and switch the changeover switch 4 via the control circuit 7.

[0004]

In the conventional television receiver, as described above, in order to confirm the effect of ghost elimination, it is necessary to operate the changeover switch 4 for turning on / off the ghost elimination function. It was not possible to confirm the image before and after the removal.

The present invention has been made to solve the above problems, and it is possible to simultaneously confirm the image before ghost removal and the image after ghost removal, and easily confirm the ghost removal effect. An object of the present invention is to obtain a television receiver with a ghost removing device that can be used.

[0006]

A television receiver with a ghost elimination device according to the present invention receives a video signal before ghost elimination and a video signal after ghost elimination, and displays the video signal after ghost elimination on a display screen. A picture-in-picture circuit is provided for displaying the video signal before ghost removal on the child screen of the display screen while displaying on the main screen.

[0007]

In the present invention, the parent screen of the display screen displays the video signal after ghost removal, and the child screen of the display screen displays the video signal before ghost removal,
Images before and after ghost removal are displayed at the same time.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration according to this embodiment, which is different from the conventional configuration in that a picture-in-picture circuit (hereinafter, abbreviated as PIP circuit) 11 is added, and the PIP circuit 11 outputs the output of the VIF demodulator 3. The output of the control circuit 7 and the output of the changeover switch 4 are input.

Next, the operation will be described. Antenna 1
The television signal received by the tuner 2 and selected by the tuner 2 is demodulated by the VIF demodulator 3. The demodulated video signal is input to the PIP circuit 11, and the ghost signal is artificially removed by the ghost removing device 5 by the operation of the changeover switch 4 as in the prior art, or the PIP is passed through the changeover switch 4 as it is. It is input to the circuit 11. When the PIP circuit 11 is not operating, the video signal from the changeover switch 4 is displayed on the display screen via the video signal processing circuit 6. In this case, the video before or after the ghost removal is displayed on the display screen. Displayed on the entire surface.

When the PIP circuit 11 is operated through the control circuit 7 by operating the key operation unit 8, the video signal before ghost removal input from the VIF demodulator 3 is displayed on a part of the display screen as a sub screen. The signal input from the changeover switch 4 is simultaneously displayed as a parent screen on a portion of the display screen excluding the child screen. Therefore, when the PIP circuit 11 is operated with the changeover switch 4 connected to the terminal b side, the image after ghost removal is displayed on the parent screen of the display screen and the image before ghost removal is displayed on the child screen of the display screen. Is displayed, and the ghost removal effect can be easily confirmed by comparing the two.

[0011]

As described above, according to the present invention, the images before and after the ghost removal are simultaneously displayed, so that the ghost removal effect can be easily confirmed.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a television receiver with a ghost eliminating device according to the present invention.

FIG. 2 is a schematic configuration diagram of a conventional television receiver with a ghost removing device.

[Explanation of symbols]

 1 Antenna 2 Tuner 3 VIF Demodulator 4 Changeover Switch 5 Ghost Removal Device 7 Control Circuit 11 Picture-in-Picture Circuit

Claims (1)

[Claims] 1. A ghost elimination device for pseudo elimination of a ghost signal from a received video signal, and the received video signal and the output of the ghost elimination device are inputted, and a video signal after the ghost elimination is displayed on a main screen of a display screen. And a picture-in-picture circuit for displaying the video signal before ghost removal on the child screen of the display screen.