KR19980041111U - Screen Stabilizer for Asynchronous Tele Video - Google Patents

Abstract

The present invention is an asynchronous screen of tele video which can stabilize the instability of horizontal sync due to the playback of the blue back screen for reservation recording in tele video by adjusting the loop time constant of the horizontal sync signal by the AFC filter stage. Provide a stabilization device.

Accordingly, the present invention performs a signal processing for recording the broadcast signal tuned from the tuning means (2, 4) to the video tape through the signal recording / reading unit (10) according to the mode switching state of the mode switching unit (6). The vertical deflection of the recording signal processing section 8, the image processing means 16, 18, 20 for image processing the image information reproduced through the tuned broadcast signal or the reproduction signal processing means 14, and the CRT 22. Vertical deflection means 26 and 28 for vertical deflection drive for driving, horizontal deflection unit 30 for generating a horizontal output signal to the horizontal output driver 32 for driving the FBT 34, and according to the reservation recording mode. Pseudo-synchronization generating means (24) for generating a pseudo horizontal / vertical synchronization signal in a tele video having an OSD signal processing unit (40) for providing a blue back screen for setting a reservation recording. And, the pseudo-synchronization at the time of reservation recording setting through the function setting unit 36 A pseudo horizontal / vertical synchronization signal is generated from the generating means 24 so that a blue back screen for reservation recording setting is formed through the OSD signal processing unit 40, and the AFC phase correction of the horizontal deflection unit 30 is performed. A phase correction for correcting the AFC phase of the horizontal deflection unit 30 by receiving a control signal from the control means 38 for generating a control signal for the control signal and the control signal from the control means 38 when setting a reservation recording according to the reservation recording mode. It is characterized by comprising a means 42.

Description

Screen Stabilizer for Asynchronous Tele Video

The present invention relates to a screen stabilization device for asynchronous video of televideo, and more particularly, to compensate for stabilization of horizontal synch caused by no signal asynchronous due to the playback of a blue back screen for reservation setting of a televideo. The present invention relates to a screen stabilizer for asynchronous video.

As is well known, televisions for selecting a predetermined channel among a plurality of channels transmitted from a plurality of television stations and performing video / audio processing through a CRT (Cathode Ray Tube) and a speaker, respectively, are transmitted in an airwave form. In addition to the function of playing back a television broadcast, a function of reproducing an external input signal for introducing and playing back video information recorded on a recording surface of a video recording medium such as a video tape is also an important function. In order to play the video tape, a video tape recorder equipped to record or play back video information is equipped with a video tape and a video / audio terminal must be wired.

On the other hand, in recent years, a tele-video which integrates a video tape recorder which reads video information recorded on a video tape or records predetermined video information on a recording surface of a video tape and a television which is in charge of tune-up reproduction of television broadcasting is developed and used. As such, the televideo eliminates the need for an external wired connection between the system for recording / playback of video information and the system for tuning / playback of television broadcasting, and separately purchases each videotape recorder and television separately. There is an advantage that there is no need.

In such a tele video, a playback function for reproducing video information recorded on a recording surface of a mounted and loaded video tape, a recording function for recording a video / audio signal of a television broadcast on a recording surface of the video tape, and a broadcasting function for a predetermined time A variety of functions are provided, such as a reservation recording function for pre-reserving and recording a television broadcast signal of a predetermined channel, and a rewinding / fast-forwarding function for quickly searching a desired recording section of a video tape.

On the other hand, in order to schedule recording of a predetermined program of a television broadcast in such a tele-video, a reservation recording setting by a viewer must be made. When a reservation recording setting is made according to execution of the reservation recording mode, an OSD (On-Screen Display) When the blue back screen is formed, the input status of the reservation recording setting items such as the reservation date, reservation time, and reservation channel can be displayed in the form of OSD characters.

However, when the blue back screen for the scheduled recording setup item is displayed by executing the scheduled recording setup according to the scheduled recording mode in such a tele-video, the asynchronous signal input state is generated when no signal is received. As the shaking phenomenon occurs due to the instability of the blue back screen, normal reservation recording cannot be made.

Accordingly, the present invention has been made in view of the above circumstances, and the instability of the horizontal synchronization caused by the playback of the blue back screen for reservation recording setting in tele-video is controlled by adjusting the loop time constant of the horizontal synchronization signal by the AFC filter stage. An object of the present invention is to provide a screen stabilizer for asynchronous video of televideo.

According to the asynchronous screen stabilization apparatus of the tele-video according to the present invention to achieve the above object, recording the broadcast signal selected from the tuning means in the video tape through the signal recording / reading unit in accordance with the mode switching state of the mode switching unit A recording signal processor for performing signal processing for the video, video processing means for video processing the video information reproduced through the selected broadcast signal or playback signal processing means, and vertical deflection means for performing vertical deflection driving for vertical deflection of the CRT; In a tele video having a horizontal deflection unit for generating a horizontal output signal to a horizontal output drive unit for driving an FBT, and an OSD signal processing unit for providing a blue back screen for setting a reservation recording according to the reservation recording mode. Pseudo synchronous generating means for generating pseudo horizontal / vertical synchronous signal when setting scheduled recording according to When the recording is set, a pseudo horizontal / vertical synchronization signal is generated from the pseudo synchronization generating means so that a blue back screen for reservation recording setting is formed through the OSD signal processing unit, and a control signal for AFC phase correction of the horizontal deflection unit is generated. And a phase correction means for correcting the AFC phase of the horizontal deflection in response to a control signal from the control means when generating a reservation recording according to the reservation recording mode. to provide.

According to the present invention configured as described above, when a blue back screen is formed on a CRT screen to set a reservation recording according to the reservation recording mode in tele video, a pseudo horizontal / vertical synchronization signal is generated to generate vertical / horizontal deflection means. In addition, the loop time constant of the AFC filter stage is increased and the AFC phase of the horizontal deflection means is corrected to stabilize the synchronous instability so that the blue back screen for setting the reservation recording is stably displayed.

1 is a block diagram showing an apparatus for stabilizing a screen when the asynchronous televideo according to the present invention;

2 is a diagram showing a detailed circuit configuration of the phase correction shown in FIG. 1 according to a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

2: tuner, 4: video IF section,

6: mode switching unit, 8: recording signal processing unit,

10: signal recording / reading unit, 12: recording / playback driving mechanism,

14: playback signal processing section, 16: video detection / amplification section,

18: video signal processing unit, 20: video output unit,

22: CRT, 24: pseudo-motivator,

26: vertical deflection portion, 28: vertical output drive portion,

30: horizontal deflection portion, 32: horizontal output drive portion,

34: FBT, 36: function setting section,

38: first microcomputer, 40: OSD signal processing unit,

42: Phase Compensation, 44, 50: AFC Phase Detection,

46: 32 fH voltage controlled oscillator, 48: horizontal output coefficient unit,

52: horizontal output phase control unit, 54: drive element.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

That is, FIG. 1 is a block diagram showing an apparatus for stabilizing screens of asynchronous video in accordance with the present invention. In the device of the present invention, reference numeral 2 denotes a channel for selecting a predetermined channel from the first microcomputer 38, which will be described later. A tuner which receives the tuning data VT and tunes an RF signal of a corresponding channel, mixes it with a local oscillation frequency signal generated by the channel tuning data VT, and outputs it as an intermediate frequency signal. An image IF unit which amplifies an intermediate frequency of a television broadcast signal in the form of an intermediate frequency signal.

Further, reference numeral 6 denotes reproduction of a television broadcast signal of the selected channel, recording on a video tape, or reproduction from the video tape in accordance with a mode switching control of a video mode or a television mode from the first microcomputer 38, which will be described later. A mode switching unit which performs switching switching for reproduction of video information.

Reference numeral 8 denotes a recording signal processing section for performing signal modulation processing so that the television broadcast signal through the mode switching section 6 can be recorded on the video tape in accordance with a reservation recording function or an instant recording function of the video mode. It consists of a plurality of magnetic heads provided in the drum to record the television broadcast signal to be recorded from the recording signal processing section 8 on the recording surface of the video tape, and the video information recorded on the video tape as the playback function is executed. Indicates a signal recording / reading section for magnetic reading.

Reference numeral 12 denotes a recording / reproducing driving mechanism that performs motor driving for constant speed rotation of the head drum provided with the signal recording / reading unit 10 and driving of the video tape by servo control of the second microcomputer 13. 14 denotes a reproduction signal processing section for performing signal demodulation processing so that the video information signal from the video tape read out from the signal recording / reading section 10 can be reproduced.

Also, reference numeral 16 amplifies the signal to an amplification level capable of separately detecting the image information reproduced by the reproduction function of the video tape according to the video mode or the image signal of the television broadcast signal tuned through the tuner 2 and processing the image signal separately. 18 shows an image detection / amplification unit for processing, and separates the luminance signal and the chrominance signal from the signal-amplified image signal, performs luminance adjustment and color demodulation processing, synthesizes the composite image signal, and outputs the same. A video signal processing unit for synthesizing the OSD display signal from 40 with the composite video signal and outputting the composite video signal, and 20 denotes amplifying the composite video signal processed by the video signal and outputting the screen to be reproduced through the CRT 22 screen. Indicates an image output unit.

In addition, reference numeral 24 denotes a weft synchronizing unit for generating a pseudo horizontal / vertical synchronizing signal by the operation of the first microcomputer 38 to be described later when forming a blue back screen according to the reservation recording mode.

Reference numeral 26 denotes a vertical deflection portion that generates a vertical output signal by the pseudo vertical synchronization signal from the pseudo synchronization generator 24, the image information from the video tape, or the vertical synchronization signal from a television broadcast signal. 28 indicates a vertical output driver for driving the vertical deflection coil of the CRT 22 by being driven by the vertical output signal.

Further, reference numeral 30 denotes a horizontal deflection for generating a horizontal output signal by receiving video information reproduced from a video tape, a horizontal synchronous signal separated from the television broadcast signal, or a pseudo horizontal synchronous signal from the pseudo synchronous generator 24. In addition, the horizontal deflection unit 30 receives the pseudo horizontal synchronization signal when the blue back screen is formed when setting the reservation recording according to the reservation recording mode, and is horizontal by the phase compensator 42 to be described later. The AFC phase of the synchronization signal is corrected.

Here, the horizontal deflection unit 30 receives the pseudo horizontal synchronizing signal from the pseudo synchronization generating unit 24 as shown in FIG. 2 and the correction amount in which the AFC phase is corrected by the phase correction unit 42 described later. A first AFC phase detector 44 for detecting and outputting an AFC phase according to the present invention, a 32fH voltage controlled oscillator 46 operating voltage controlled oscillation at a frequency 32 times the horizontal synchronizing signal, and the horizontally controlled signal synchronizing the voltage And a horizontal output drive unit 48 for comparing and counting the phase-detected horizontal output drive signal and generating the counted output value, and a second AFC phase detector for receiving phase output by receiving the horizontal output drive signal from the FBT 34 described later. And a horizontal output phase control unit 52 for controlling and outputting the phase of the horizontal output signal based on the count output value.

Reference numeral 32 denotes a horizontal output driver which receives a horizontal output signal from the horizontal deflector 30 and generates a horizontal output drive signal for driving the FBT 34.

Further, reference numeral 36 is composed of a matrix button unit installed in a predetermined portion of a remote controller for remote control or the main body of the main body, and is used to specify a reserved recording setting item such as a reserved date, a reserved time, and a reserved channel according to the mode of the reserved recording mode. A function setting section for performing key operation for reservation recording setting is shown.

Also, reference numeral 38 enables the pseudo synchronization generating unit 24 to generate a pseudo horizontal / vertical synchronization signal when setting the reservation recording according to the reservation recording mode by the key operation of the function setting unit 36. In addition, a blue back screen for setting a reservation recording is displayed on the screen, and a first microcomputer for generating a control signal for controlling the AFC phase correction of the horizontal deflection unit 30 is shown.

Reference numeral 40 denotes an OSD signal processing unit for generating OSD display information of a blue back screen for displaying a reservation recording setting item for reservation recording setting by the display control of the first microcomputer 38.

Reference numeral 42 is a phase compensator for correcting the AFC phase with respect to the first AFC phase detector 44 of the horizontal deflection unit 30 by receiving the control signal from the first microcomputer 38. As shown in FIG. 2, the phase compensator 42 adjusts the number of viewers for phase control of the first AFC phase detector 44 of the horizontal deflector 30 to the first AFC phase detector 44. Drive consisting of a time constant element consisting of a resistor (R2) and capacitors (C2, C3) connected in parallel with respect to the same) and a control signal from the first microcomputer (38) connected to the base end thereof. The loop time constant for the time constant element consisting of the resistor R2 and the capacitors C2 and C3 connected to the element 54 and the collector end of the drive element 54 and according to the conduction of the drive element 54. Time constant adjustment consisting of a resistor (R1) and a capacitor (C1) It is configured to include characters.

Next, the operation of the present invention made as described above will be described in detail with reference to the accompanying drawings.

First, in the case where the reserved recording mode is executed by the key operation of the function setting unit 36 and the reserved recording setting for the program of a predetermined television broadcast is made, the first microcomputer 38 operates the OSD signal processing unit 40. By controlling it, OSD display information of a blue back screen for displaying a reservation recording setting item such as a reservation date, a reservation time, and a reservation channel for a predetermined broadcast recording is generated and displayed.

At this time, the first microcomputer 38 enables the pseudo synchronization generator 24 to enable the pseudo horizontal / vertical synchronization signal to be applied to the vertical deflection portion 26 and the horizontal deflection portion 30, respectively. In addition, the phase correction unit 42 generates a control signal for AFC phase correction of the horizontal deflection unit 30.

Accordingly, the drive element 54 of the phase compensator 42 is electrically connected to the base end of the control signal from the first microcomputer 38 and connected to the collector end of the drive element 54. The time constant adjustment element composed of the resistors R1 and C1 increases and adjusts the loop time constant for the time constant element composed of the resistor R2 and the capacitors C2 and C3 according to the conduction of the driving element 54. On the other hand, the first AFC phase detector 44 of the horizontal deflection unit 30 receives the pseudo horizontal synchronization signal from the weft synchronizing unit 24 and increases the loop time constant from the phase compensator 42. Phase detection is performed on the pseudo horizontal synchronizing signal according to the amount of correction.

Accordingly, the horizontal output coefficient unit 48 of the horizontal deflection unit 30 is a 32 fH voltage controlled oscillator 46 for voltage-controlled oscillation of the pseudo horizontal synchronization signal from the first AFC phase detector 44 at a horizontal frequency of 32 times. By comparing the horizontal synchronous signal and the horizontal output drive signal from the second AFC phase detector 50 through the oscillation frequency signal from the (6), the horizontal output phase control unit 52 is the horizontal output coefficient unit 48 As the horizontal output signal is generated by controlling the phase of the horizontal synchronous signal based on the count output value from the horizontal output driver 32, the horizontal output driver 32 supplies the horizontal output drive signal having a stable phase to the FBT 34. The blue back screen appearing on the CRT 22 screen can be stably displayed.

According to the present invention made as described above, when setting the reservation recording according to the reservation recording mode in the tele video, the AFC phase for the horizontal deflection unit is corrected, and the blue-back screen displayed for the reservation recording setting is displayed in a stable state. As a result, the reservation recording setting can be performed in a more normal screen state.

Claims (2)

The recording signal processing section 8, which performs signal processing for recording the broadcast signal tuned from the tuning means 2, 4 to the video tape through the signal recording / reading section 10 in accordance with the mode switching state of the mode switching section 6. And image processing means (16, 18, 20) for processing image information reproduced through the tuned broadcast signal or reproduction signal processing means (14), and a vertical deflection drive for vertical deflection of the CRT (22). Vertical deflection means (26, 28) for performing the operation, horizontal deflection unit (30) for generating a horizontal output signal to the horizontal output driver (32) for driving the FBT (34), and for reservation recording setting according to the reservation recording mode In a tele video having an OSD signal processor 40 for providing a blue back screen, Pseudo synchronous generating means (24) for generating a pseudo horizontal / vertical synchronous signal when setting a reserved recording according to the reserved recording mode; When setting the reservation recording through the function setting unit 36, a pseudo horizontal / vertical synchronization signal is generated from the pseudo synchronization generating means 24 so that a blue back screen for reservation recording setting is formed through the OSD signal processing unit 40. Control means 38 for generating a control signal for AFC phase correction of the horizontal deflection unit 30; And a phase correction means (42) for correcting the AFC phase of the horizontal deflection unit (30) by receiving a control signal from the control means (38) when setting a reservation recording in the reservation recording mode. Screen stabilizer for asynchronous video. 2. The phase correction means (42) according to claim 1, wherein the phase correction means (42) is connected to the driving element (54) which is turned on by receiving the control signal from the control means (38), and according to the conduction of the driving element (54). And a time constant adjusting unit (R1, C1) for providing an increased loop time constant to C2, R2, and C3.