KR100188222B1 - Vcr with the function of head azimuth angle adjusting on variable speed reproduction - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for judging a reproduction speed mode (standard / 2x / 3x) on the basis of the number of CTL (Control) Speed mode in which the azimuth angle of the head is adjusted so that the video field section recorded on the video tape and the scanning direction of the video head coincide with each other so as to reproduce and output a high- A video cassette recorder for recording / reproducing an audio / video signal on / from a video tape (T) driven by a tape drive mechanism (16), the video cassette recorder A control signal input unit 10 for setting a standard / 2x / 3x speed reproduction mode; A controller 12 for controlling the motion mechanism 16 and controlling the azimuth angle of the video head 57 on the basis of a CTL pulse detection signal output from the CTL pulse detector 20, A CTL pulse detecting unit 20 for detecting a CTL pulse recorded at predetermined intervals in the drum 56 and outputting a CTL pulse detection signal corresponding to the detected CTL pulse to the controller 12; And an angle adjusting means for adjusting the azimuth angle of the installed video head 57. The azimuth angle of the head is adjusted in accordance with the reproduction speed of the video tape during the variable speed reproduction so that noise is removed through the reproduction screen Thereby providing a high-quality image.

Description

Video cassette recorder with head azimuth angle adjustment during variable speed playback

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder having a function of adjusting the azimuth angle of a head during a speed change reproduction and more particularly to a video cassette recorder in which a video cassette recorder And more particularly to a video cassette recorder capable of adjusting azimuth angle of a head during variable speed reproduction so as to provide a high quality image by adjusting the azimuth angle to 6. (VHS standard angle) or less.

Generally, when a user attaches a video tape to be played back to a video tape recorder (hereinafter, referred to as a VCR) and then sets a playback mode, audio and video signals recorded on the video tape are recorded on the VCR The read audio signal and the video signal are reproduced by the audio / video reproducing means constructed in the VCR, and then the audio signal and the video signal outputted from the VCR are input For example, a television.

A conventional technique will be described with reference to FIGS. 1A and 1B attached hereto.

The video head provided on the drum when the standard reproduction mode is set by the user scans the video signal recorded on the video tape in field intervals while keeping the azimuth angle of the head at 6. as shown in Fig. , The traveling speed of the video tape is 33.3 [mm / sec], and the video signal recorded on the video tape is recorded in the unit of the field interval with the angle of 6. As a result, And is regenerated normally.

However, when the user sets the double-speed playback mode, for example, for high-speed searching of the screen, since the traveling speed of the tape is 66.6 [mm / sec] as shown in Fig. 2A, the azimuth angle of the head 6, the video head does not scan only a single field section during the scanning period but passes through an adjacent field section as shown in FIG. 1B, Reads the video signal of the video field period adjacent to the video field period and also reads the boundary region between the specific video field period and the adjacent video field period.

On the other hand, since the video signal is not normally recorded in the boundary region, the video signal read out while the video head scans the boundary region is outputted as noise on the reproduction screen.

Therefore, if the user sets the 2x / 3x speed reproduction mode for high-speed screen search, the reproduced picture quality is deteriorated because the noise is reproduced and outputted not only on the video signal read from the video tape on the reproduction screen .

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method and apparatus for determining a reproduction speed mode (standard / 2x / 3x) on the basis of the number of CTL When the reproduction speed mode is the 2x speed mode or the 3x speed mode, the azimuth angle of the head is adjusted so that the video field interval recorded on the videotape matches the scanning direction of the video head, so that the high- And to provide a video cassette recorder having a function of adjusting the azimuth angle of the head during the speed change reproduction.

According to an embodiment of the present invention for realizing the above object, there is provided a video cassette recorder for recording / reproducing an audio / video signal on a video tape driven by a tape drive mechanism, / 3x speed reproduction mode; and a controller for controlling the tape driving mechanism according to the reproduction mode setting state in the control signal input unit, and for controlling the tape driving mechanism based on the CTL pulse detection signal output from the CTL pulse detection unit, A CTL pulse detector for detecting a CTL pulse recorded at a predetermined interval on the video tape and outputting a corresponding CTL pulse detection signal to the controller; And an angle adjusting means for adjusting the azimuth angle of the installed video head. The charge of Bournemouth video cassette recorder with the respective control function is provided.

Preferably, the angle adjusting means includes a motor driving unit for driving and controlling a motor for driving the guide member by the control unit, a guide member having a plurality of folded guides formed on the side surface thereof and coupled to a motor shaft integrally formed with the motor, An angle adjusting member which is integrally formed on a side surface of the guide rod moving up and down along the guide and which is integrally formed with a motor for driving the drum on the upper surface thereof and a motor provided integrally with the motor, And a drum connected to the shaft.

According to the present invention configured as described above, the azimuth angle of the head is changed to 6. or less in high speed mode reproduction, and the video field period recorded on the video tape is matched with the scanning direction of the video head, It is possible to prevent a case where the adjacent video field is scanned while scanning.

Therefore, it is possible to provide a high-quality image on the screen during the speed change reproduction.

1A is a view showing azimuth angles of a head in a standard reproduction in a conventional video cassette recorder,

1B is a diagram showing a scanning state of a head during variable speed reproduction in a conventional video cassette recorder,

2 is a block diagram of a video cassette recorder having an azimuth angle control function of a head in variable speed reproduction according to an embodiment of the present invention,

3 is a diagram illustrating an example of an azimuth angle adjusting device for a head in a variable speed reproduction according to an embodiment of the present invention,

Fig. 4 is a view showing azimuth angles in variable speed reproduction in a video cassette recorder to which the present invention is applied.

Description of the Related Art [0002]

10: control signal input unit, 12: control unit,

16: tape drive mechanism, 18: signal recording /

20: CTL pulse detection unit, 30: switch unit,

32: signal recording processing section, 34: connection terminal,

36: Signal reproduction processing section, 40: Motor drive section,

42: motor, 44: guide member,

45: Guide, 50: Support,

52: angle adjusting member, 53: guide rod,

54: drum motor, 56: drum,

57: Video Head.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of a video cassette recorder having a head azimuth angle control function in variable speed reproduction according to an embodiment of the present invention. Reference numeral 10 denotes various types of functions For example, in the present invention, a control signal input unit composed of, for example, a remote controller or a control panel installed on a front surface of a corresponding VCR for inputting a corresponding key signal to set various control functions, such as 'PLAY' The input unit 10 includes a '2 × speed playback' button and a '3 × speed playback' button for performing a fast screen search in order to set a mode according to the playback speed when the playback mode is set.

Reference numeral 12 denotes a control unit for performing control over the entire apparatus in response to a control signal input from the control signal input unit 10. In the present invention, the control unit 12 controls the corresponding video signal based on CTL pulses read from the video tape. After determining the reproduction mode of the tape, the azimuth angle of the video head 57 provided on the drum 56 is adjusted so as to be suitable for the reproduction speed mode, and a predetermined control signal is applied to the motor driving unit 40.

Reference numeral 16 denotes a tape driving mechanism for driving and controlling the state of the video tape T mounted in the deck under the control of the controller 12. Numeral 18 denotes an audio head and a plurality of video heads, A signal recording / reading section for reading an audio / video signal recorded on the video tape (T) under control or for recording an audio / video signal on the video tape (T) Is a CTL pulse detector for detecting a CTS pulse recorded in a data area at a predetermined interval (1/240 sec).

Reference numeral 30 shown in FIG. 2 sets a path for reproducing the audio / video signal read from the video tape (T) based on the switching signal (SW) applied from the controller (12) Video signal input from the external A / V device input through the external A / V device 34. The audio /

Reference numeral 32 denotes a signal recording processing section for recording and amplifying the audio / video signal input from the connection terminal 34 and processing the signal into a recordable signal. Reference numeral 36 denotes a signal recording processing section for recording the audio / A signal reproduction processing section 34 for pre-amplifying the audio / video signal from the signal processing section 32 and modulating the audio / video signal from the audio / Or a connection terminal for receiving an audio / video signal outputted from an external A / V device.

Reference numeral 40 denotes a motor driving unit for controlling the forward and reverse motors of the motor 42 shown in Fig. 3 under the control of the control unit 12. Fig.

FIG. 3 is a view showing an azimuth angle adjusting device in a variable speed reproduction in a video cassette recorder according to an embodiment of the present invention. As shown in FIG. 3, a rotary shaft 43, which is integrated with the motor 42, And the guide 44 is coupled to the body portion of the guide member 44. A guide 45 having a predetermined length is formed on the body portion of the guide member 44 so as to be upward and downward.

Here, the guide 45 is formed at a predetermined interval such that, for example, the points ①, ②, and ③ are formed in a bent shape so that the guide rod 53 is fixed to the point ① in the case of standard reproduction, The rod 53 is fixed to the point 2, and in the case of triple speed reproduction, the guide rod 53 is fixed to the point 3.

The guide rod 53 is integrally formed with the angle adjusting member 52 and is configured to be moved up and down along the guide 45. The angle adjusting member 52 includes a hinge shaft 51 The inclination of the angle adjusting member 52 is adjusted according to the moving state of the guide rod 53. [

The angle adjusting member 52 is integrally formed with the motor shaft 55 and is integrally formed with a motor 54 for driving the drum 56. The angle adjusting member 52 is integrally formed with the motor shaft 55, A drum 56 is coupled and performs rotational motion by the power supplied from the motor 54. A video head 57 is formed on the drum 56 and a video recorded on the video tape T Signal.

Hereinafter, the operation of the video cassette recorder having the azimuth angle adjusting function of the head in the variable speed reproduction according to the embodiment of the present invention will be described in detail.

First, when a user sets a playback mode through the control signal input unit 10 and a corresponding control signal is input to the controller 12, the controller 12 controls the tape drive mechanism 16 and the signal recording / The audio / video signal recorded on the video tape T is read by the audio / video head configured in the signal recording / reading unit 18 by applying a predetermined control signal to the reading unit 18, .

The control unit 12 applies a predetermined switching signal SW to the switch unit 30 so that the processing path of the audio / video signal output from the signal recording / Video signal is applied to the signal reproduction processing unit 36. The audio / video signal applied to the signal reproduction processing unit 36 is pre-amplified in the signal reproduction processing unit 36 Processed by the modulated reproducible signal, applied to the connection terminal 34, and reproduced and outputted through the external A / V device connected to the connection terminal 34. [

At this time, as the motor 42 is driven in the direction b, the guide member 44 is rotated in the bawa direction by the power transmitted through the motor shaft 43 of the motor 42, The inclination of the angle adjusting member 52 as the guide rod 53 reaches the point 1 is brought to the standard state and the drum 56 is moved to the standard position, The azimuth angle of the video head 57 provided on the VHS is maintained to be VHS standard 6. [

Meanwhile, when a control signal is applied to the controller 12 by setting a high speed mode, for example, a triple speed mode using the control signal input unit 10, the controller 12 controls the tape driving mechanism 16 For example, so that the running speed of the video tape T running in the deck is 99.9 [mm / sec].

When the video tape T is recorded at a predetermined interval on the video tape T as the video tape T runs at a high speed and the CTL pulse detected by the CTL pulse detector 20 is applied to the controller 12, The guide member 44 receives a driving force from the motor shaft 43 as the motor 42 is driven by the motor driving unit 40 in a direction by applying a predetermined control signal to the motor driving unit 40, The guide rod 53 is moved downward along the guide 45 to reach the point 3, and as the guide rod 53 reaches the point 1, the angle adjusting member The azimuth angle of the video head provided on the drum 56 becomes smaller than the VHS standard 6. (| H 6.).

Here, since the azimuth angle of the video head 57 is adjusted to be smaller than the reference angle, that is, 6., in response to the traveling speed of the video tape T running at high speed, The video signal is scanned in the same direction as shown in Fig.

The video signal read by the video head holding the azimuth angle is applied to the signal reproduction processing section 36 by the switching operation of the switch section 30 through the same operation as the above described reproduction process, And then reproduced and outputted through the external A / V device.

Therefore, when the azimuth angle adjusting device of the head is used in the video cassette recorder in the variable speed reproduction of the above-described configuration, the scanning direction of the video head coincides with the video field period, It is possible to eliminate the noise on the screen that is generated due to the inconsistency of the scanning direction in the video field period in the taking.

As described above, according to the video cassette recorder having the azimuth angle adjustment function of the head in the variable speed reproduction according to the embodiment of the present invention, the azimuth angle of the head during the variable speed reproduction is adjusted to be smaller than 6. VHS standard, It is possible to provide a high-quality image through the < RTI ID = 0.0 >

Claims (2)

A video cassette recorder for recording / reproducing an audio / video signal on a video tape (T) driven by a tape drive mechanism (16) A control signal input unit 10 for setting a standard / 2x / 3x playback mode in the playback mode setting, And controls the tape drive mechanism 16 in accordance with the reproduction mode setting state of the control signal input unit 10 and also controls the video head 57 to move the video head 57 based on the CTL pulse detection signal output from the CTL pulse detecting unit 20. [ A controller 12 for controlling the horse angle to be controlled, A CTL pulse detector 20 for detecting CTL pulses recorded at regular intervals on the video tape T and outputting a corresponding CTL pulse detection signal to the controller 12, And an angle adjusting means for adjusting an azimuth angle of a video head 57 provided on a side surface of the drum 56 under the control of the controller 12. The azimuth angle adjusting function of the head Equipped video cassette recorder. The apparatus according to claim 1, wherein the angle adjusting means comprises a motor driving unit (40) for driving and controlling a motor (42) for driving the guide member (44) by the control unit (12) A guide member 44 formed with a motor 45 and coupled to a motor shaft 43 integrally formed with the motor 42 and a guide rod 53 moving upward and downward along the guide 45, An angle adjusting member 52 formed integrally with the motor 54 for driving the drum 56 on the upper surface thereof and a motor 54 integrally formed with the motor 54, And a drum (56) connected to the shaft (55). The video cassette recorder according to claim 1,