KR910005522B1 - Magnetic recording device - Google Patents

Abstract

The apparatus combining a video tape recorder with digital autio tape recorder in one body has 4 heads (R,R',L,L') located at opposite position with different azimuth angle on drum between an upper (69) and a lower drum (70), records and reproduces the data by operating 4 heads (R,R',L,L') in order in VTR mode and by operating 2 heads (R,L) out of 4 head in DAT mode. The azimuth angles of 4 heads (R,R',L,L') are +20 deg.C, +6 deg.C, -20 deg.C, -6 deg.C respectively. The winding angle of the tape of the drum is about 90 deg.C.

Description

Magnetic recording and playback device

1 is a schematic diagram of deck arrangement of a magnetic recording and reproducing apparatus according to the present invention.

Figure 2a is a schematic diagram showing the head arrangement of the drum.

b is the data pattern of the tape during VTR switching.

c is the data pattern of the tape during DAT switching.

3 is a block diagram showing each area of a daif.

4 is a schematic diagram showing the position of the drum and each head.

5 is a block diagram of a magnetic recording and reproducing apparatus according to the present invention.

6A is a head switching timing diagram during VTR operation.

b is a timing diagram of head switching during DAT operation.

* Explanation of symbols for main parts of the drawings

10: VTR section 200: DAT section

1: Main power supply 2: VTR power supply terminal

3: DAT power supply terminal 4: Video in terminal

5: Audio In Terminal 6: Line Amplification Circuit

7: ALC (AUTOMATIC LEVEL CONTROL: Automatic Signal Level Control Circuit)

8: REC amplifier circuit 9: Head switch unit for REC / PB

10: oscillation circuit 11: audio head

12: AGC (Auto Gain Control) 13: Y / C separation circuit

14 pre-emphasis circuit 15 FM modulation circuit

16: ACC (Auto Color Control) 17: Amphasis Circuit

18: low pass modulation circuit 19: first mix circuit

20: second mix circuit 21: AIF (Auto Track Finding) circuit

22: micom 23: digital sub

24: motor sense amplifier circuit 25: Capstin motor drive unit

26: drum motor drive unit 27: head switching pulse (FF 30) generating unit

28: 1/2 CD 29: Capstan motor

30: drum motor 31: recording / playback amplifier circuit

32: R head 33: R 'head

34: L head 35: L 'head

36: DAT Microcomputer 37: DAT Servo

38: Audio Emphasis 39: A / D Converter

40: signal processing unit S1: power switch

S2: CH switching S / W by head switching pulse (FF 15)

S3: CH switching S / W by head switching pulse (FF 30)

S4: DAT CH Switching S / W

S5: DAT / VTR Switching S / W

51: drum

52: supply slant pole

53: supply guide roller

54: Deck 55: EF Head

56: tension pole

57: supply guide pole

58 tape 59 supply reel

60: take-up reel 61: back guide pole

62: pinch roller 63: capstan shaft

64: audio head

65: take up guide pole

66: take up guide roller

67: take up slant pole

68: head 69: upper drum

70: lower drum

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus, and more particularly, to a magnetic recording and reproducing apparatus in which a video tape recorder (VTR) and a digital audio tape recorder (DAT) are integrally combined and used in common. It is about.

DAT, which is commonly used, has a head azimuth recording method by drum rotation, and is very similar to the conventional VTR in the structure of the deck. In addition, a tape used as a data recording and reproducing medium is a magnetic tape to record or reproduce a predetermined video or audio signal through a recording / reproducing head (R / W head).

Conventionally, since the DAT and the VTR are separate devices, and the integrated and integrated ones have not been developed, the DAT and the VTR have to be provided in spite of the similarity of functions. The question was raised.

Accordingly, an object of the present invention is to provide a magnetic recording and reproducing apparatus in which VTR and DAT are integrally combined, decks are used in common, and each apparatus is operated in response to selection of a predetermined changeover switch.

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

1 is a schematic view showing the deck structure of the magnetic recording and reproducing apparatus according to the present invention, except that the tape winding angle on the drum 51 is about 90 °, and the deck structure of the conventional VTR or DAT. It is made similar. The diameter of the drum 51 is ø30, and the tape used is one of 4 mm.

2 shows the head arrangement on the drum according to the present invention and the tape data pattern during VTR or DAT switching, respectively. Referring to FIG. 2a, four heads L, L ', R, R'), which is one of the main features of the present invention. 2B is a tape data pattern at the time of VTR switching, and the recording order of the headles proceeds in the order of R → R '→ L → L' → R as shown. In FIG. 2C, only two heads R and L of the four heads are used as the tape data pattern at the time of DAT switching, and the recording procedure proceeds in the order of L → R → L → R as shown.

3 shows each data area in a tape (for example, a 4 mm tape) applied to the present invention, in which a is the full width of the tape, b is the first option track during DAT switching, and An audio track at VTR switching, f is a second option track at DAT switching and an option track at VTR switching, c and e are guide tracks, and d is an audio signal area and VTR switching at DAT switching. The video signal area of the city. Therefore, each of the above tape regions can be used interchangeably in DAT switching according to the respective areas of the existing DAT tape format. Also, when VTR switching, the VTR region is secured to secure the VTR video and audio signals as shown. It is supposed to be able to record. The audio signal can be put into one of the option tracks (b, f) of the DAT, but when the VTR is switched, the audio signal is put into the first option track (b) to provide a sense of stability of the head.

4 is a view showing the respective positions of the drum and the head according to the present invention, which has four heads 68 spaced apart from each other between the upper drum 69 and the lower drum 70 at positions opposite to each other. The arrangement of the full-width erasing head 55 and the audio head 64 is the same as in the conventional method.

5 is a block diagram of the magnetic recording and reproducing apparatus according to the present invention, in which the power supply voltage from the main power supply 1 is supplied by the power supply switch 1 in response to the selection of the DAT / VTR switching sketch S5. (2) Alternatively, the function of the corresponding DAT or VTR is executed while being applied to the power supply terminal 3 of the DAT unit. In addition, the switch S2 allows channel switching switching by the head switching pulse FF 15 and the switching S3 performs channel switching switching by the head switching pulse FF 30. Here, FF FF 15 and FF FF 30 correspond to a switching pulse cycle in the VHS system. The switch S4 is a channel switching switch of the DAT. The R head 32, the R 'head 33, the L head 34 and the L' head 35 are connected to the recording / playback amplifier circuit 31, respectively, by the head switching of the switches S2 and S3. Perform a predetermined recording or playback operation.

FIG. 6 is a timing diagram of head switching during VTR or DAT operation in the block diagram of FIG.

The operation relationship of the present invention is described above with reference to the above-described drawing configuration.

First, when the S5 switch of FIG. 5 is switched to DAT, the main power source for operating the system operates the DAT circuit to operate as a normal DAT device. The signal flow operates in the same way as the existing DAT, but the process of recording and playing by switching the R and L heads of azimuth ± 20˚, the head of the DAT, among the four heads in the drum is as follows.

The head switching pulse by the drum rotation of 2000 RPM controls the S4 switch of FIG. 5 to switch between the R head and the L head. The switching pulse is shown in FIG. 6, and the signal waveform recorded thereby becomes the same as the general DAT, and is shown in the DAT switching section in FIG.

In comparison with the conventional DAT in the deck configuration shown in FIG. 1, the full-width erasing head 55 and the audio head 64 are not present in the general DAT, so that the signal of the head is not operated when the DAT is switched. As a result, a signal having the same format as a general DAT can be obtained and recording and playback can be performed.

Then, when the S5 switch of Formula 5 is switched to VTR, the main power source 1 for operating the system operates the VTR circuit so that the circuit to the DAT is cut off. The 4mm VTR is recorded on the tape as an audio head 11 by the line amplification circuit 6, the ALC 7, the REC amplification circuit 8, and the oscillation circuit 10 when an audio signal is input from the terminal 5 of FIG. do. The video signal coming into the fourth terminal is processed through the AGC circuit 12 and processed with luminance and color (Y / C) and then mixed with the ATF signal, which is switched at the switch S2 and the switch S3 and recorded in the head, respectively. . The switching pulses driving S2 and S3 are generated at 1/2 CD 28 and FF 30 27, and are shown in FIG. 6 in the form of this switching pulse. As shown in FIG. 6, four head switching pulses are generated at FF 30 and FF 15 and are sequentially recorded in the order of R → R '→ L → L' head.

Of these, R, R 'and L, L' each constitute one screen. That is, the portion recorded by each head becomes a field, and each portion recorded by the R, R 'head and the L, L' head becomes one frame. Looking at the arrangement of the heads, it is constructed as shown in FIG. The data recording pattern tape-recorded in this manner is configured as shown in FIG. 2B. In this case, by using four different azimuth heads, crosstalk between adjacent tracks is eliminated and noise is removed.

The digital servo 23 is controlled by the drum motor driver 26 so that the drum rotation speed is 900 RPM as the tape is loaded at 90 degrees. Meanwhile, the ATF video signal that controls the speed of the tape is mixed and recorded together on the tape.

At this time, the drum speed should be 900RPM because NTSC field frequency is 59.94Hz ≒ about 60Hz, so it takes 60Hz when rotated 90˚. As a result, 1 / 15sec is consumed in one revolution, and thus it becomes 15RPS and thus 900RPM. (In the non-NTSC mode, the drum rotation speed changes.)

In addition, when looking at the tape format, the area of the tape that determines each tape format is divided as shown in FIG. 3, and its size and length are the same as that of the existing DAT tape format. A compatible area is ensured, and when using VTR switching, an audio track is used on the top of the tape. The arrangement of the audio head 64, the full erase head 55 and the magnetic recording head 68 is shown in FIG.

As described above, the present invention allows the VTR and the DAT to be integrally combined and the deck can be used in common, thereby allowing for convenience and cost reduction.

Claims (4)

In the magnetic recording and reproducing apparatus, four heads R, R ', which are spaced apart from each other on the outside of the drum between the upper drum 69 and the lower drum 70 and have predetermined different azimuth angles, L, L '), and the heads R, R', L, L 'are sequentially operated to switch the video tape recorder VTR so that data can be recorded and reproduced. And DAT), wherein the two heads (R, L) of the heads are selectively operated to record and reproduce data. The magnetic recording reproduction of claim 1, wherein the azimuth angles of the four heads R, R ', L, and L' are + 20 °, + 6 °, -20 °, and -6 °, respectively. Device. The magnetic recording and reproducing apparatus according to claim 1, wherein the tape winding angle on said drum is approximately 90 degrees. 2. The method according to claim 1, wherein the video tape recorder switching and the digital audio tape recorder switching are performed by applying a predetermined power supply voltage corresponding to the selection of the switching switch S5 to the VTR unit or the DAT unit through the power switch S1. And a recording / playback function.

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