JPH06319058A - Television receiving system - Google Patents

Abstract

PURPOSE:To save the operation of a VTR-SW button by discriminating a reproducing code or a stop code for a VTR and automatically switching the time constant of an AFC to optimum characteristic. CONSTITUTION:An AFC control line from a microcomputer 13 is waited at an 'L' state until the input of a VTR remote control code, and when a remote controller receiver 12 receives a reproducing code, the microcomputer 13 discriminates the received code and turns the control line to 'H'. The AFC control line is waited at the 'H' state until the input of a remote control code, and when the receiver 12 receives a stop code through a remote control key, the microcomputer 13 discriminates the received code and turns the control line to 'L'. When the control line is in the 'L' level, an AFC time constant changing switch 14 is not switched and allowed to correspond to a video image source received from an antenna 1, and when the control line is turned to the 'H', the switch 14 is driven, switched so that the AFC time constant is shortened and allowed to correspond to the video image source of the VTR. Thus labor for operating a VTR-SW button in each depression of a reproducing or stop key can be saved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TV image receiving system for easily controlling the AFC of a television (hereinafter referred to as TV) image receiver in correspondence with a video source.

[0002]

2. Description of the Related Art FIG. 2 shows a main circuit configuration of a general TV receiver. In the figure, 1 is an antenna, 2 is a tuner, 3 is a tuner control circuit, 4 is an intermediate frequency amplifier circuit, and 5 is an amplifier. Is an audio output circuit, 6 is a speaker, 7 is a video chroma junction circuit (hereinafter referred to as VCJ), 8 is a video output circuit, 9 is a horizontal output circuit, 10 is a vertical output circuit,
Reference numeral 11 is a CRT, 12 is a remote control receiver, 13 is a microcomputer, and 14 is an AFC time constant changeover switch.

In such a structure, conventionally,
At the time of reproducing the VTR, the AFC time constant of the TV receiver had to be switched by pressing the play button of the remote controller and further pressing the VTR-SW button provided on the remote controller for switching the AFC time constant changeover switch 14. This is because if the VTR-SW button is not pressed during VTR reproduction, the AFC time constant for VTR becomes a little longer, which causes screen distortion due to VTR skew distortion or the like.

The operation of this conventional system is shown in the flow chart of FIG. When the VTR-SW button is pressed after pressing the play key on the remote controller (G), a signal is given from the remote controller receiver 12 to the microcomputer 13, and the microcomputer 1
The control line 3 becomes "H" level (H), and the "H" level signal is input from the microcomputer 13 to the AFC time constant changeover switch 14. The "H" level signal causes the AFC time constant changeover switch 14 to shorten the AFC time constant in the VCJ 7. When the VTR-SW button is pressed again after pressing the stop key of the remote controller (I), the control level of the microcomputer 13 returns to "L" (J).

[0005]

As described above, in the conventional TV image receiving system, it is necessary to operate the reproduction or stop key and the VTR-SW button when the VTR is reproduced or stopped, and the operation is complicated. .

The present invention has been made in order to solve the above problems, and the user presses the VTR-SW button to set the AFC time constant each time the VTR is played or stopped. An object of the present invention is to provide a TV receiver system capable of automatically obtaining an optimum image without the need for switching.

[0007]

In the TV image receiving system according to the present invention, a microcomputer automatically determines a VTR reproduction code or a stop code transmitted by pressing a reproduction key of a remote controller, and a signal corresponding to the ATR is transmitted to the AFC. This is input to the time constant changeover switch.

[0008]

In the TV image receiving system according to the present invention, the AFC can be set to the optimum value only by the operation of instructing the VTR reproduction or the stop by the remote controller, and the subsequent VTR-SW button operation conventionally performed is not required.

[0009]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the flowchart of FIG. At the time of VTR operation, the AFC control line from the microcomputer remains in the "L" state until the VTR remote control code is input (A), and when the remote control receiver 12 receives the reproduction code by operating the remote control key, the microcomputer 13 The code is determined (B) and the AFC control line is set to "H" (C). AFC control line is next VT
Wait for “R” to be entered until the R remote control code is input (D), and operate the remote control key to operate the remote control receiver 12
When the stop code is received at, the microcomputer 13 discriminates this code and returns the (E) AFC control line to "L" (F).

When the AFC control line is at the "L" level, the AFC time constant changeover switch 14 is not switched and corresponds to the video source receiving the signal from the antenna 1, but the AFC control line is at the "H" level. When the level is reached, the AFC time constant changeover switch 14 operates and A
The FC time constant is switched so as to be short, and corresponds to the video source of the VTR.

[0011]

As described above, according to the present invention, the VTR
Since the VTR playback code or stop code transmitted by operating the remote control key is discriminated and the AFC time constant is automatically switched to the one having the optimum characteristic, the user is required to play the remote control every time the stop key is operated. To V
It is possible to save the trouble of operating the TR-SW button.

[Brief description of drawings]

FIG. 1 is a flowchart showing a control procedure of a TV image receiving system according to the present invention.

FIG. 2 is a block diagram showing a main part of a general TV receiver.

FIG. 3 is a flowchart showing a control procedure of a conventional TV image receiving system.

[Explanation of symbols]

 7 Video chroma junction circuit 12 Remote control receiver 13 Microcomputer 14 AFC time constant switch

Claims (1)

[Claims] 1. A means for changing the time constant of the AFC on the television receiver side at the time of receiving a television signal and at the time of reproducing a VTR, and operating this television receiver by a common remote controller for television and VTR. In the television receiving system, the television receiver is characterized in that the AFC time constant of the television receiver is switched by the play or stop code transmitted by pressing the VTR play key and the stop key of the remote controller. Image receiving method.