KR0148147B1 - Recording and reproducing apparatus independent of changing speed of the type - Google Patents

Abstract

The present invention is irrelevant to tape speed fluctuations to prevent deterioration of the reproduced signal by reading two field signals simultaneously for one field period while the tape is stopped and storing the excess signals and outputting the next one field period. A recording and reproducing apparatus is provided. The present invention includes first and second delay circuits for delaying the video signal during playback and the video signal during recording by one track, respectively. At this time, the two heads are mounted in parallel adjacent to the head drum to simultaneously trace a plurality of tracks, and the running of the tape is stopped in a section in which signals are read or written through the head. At the time of reproduction, the video signal from the first head is transferred to the signal processor in section A, and the output signal of the delayed second head is transmitted to the signal processor in section B. In the section A, the continuous signal from the signal processor is transferred to the first head and the delayed signal from the second delay circuit is transferred to the second head. In section B, the continuous signal from the signal processor is stored in the second delay circuit. . Therefore, the speed variation of the tape does not affect the signal to be recorded or reproduced.

Description

Record and playback device independent of tape speed fluctuation

1 is a state diagram showing a traveling direction of a general tape and a direction in which two heads read tracks alternately.

2 is a block diagram of a conventional recording and reproducing apparatus.

(A) and (b) of FIG. 3 are state diagrams showing the output waveform of each rotating head and the displacement of the tape in FIG.

4 is a block diagram of a recording / playback apparatus independent of the tape speed variation of the present invention.

5 is a structural diagram showing a position where a rotating head is mounted in the recording and reproducing apparatus of the present invention.

6 (a) to 6 (d) are state diagrams illustrating output and delayed signal waveforms of each rotating head and displacement of the tape in FIG.

* Explanation of symbols for main parts of the drawings

3: head drum 11, 22: tape moving servo device

12, 21: rotary head servo device 14, 27: switching unit

15, 28: signal processor 23, 24: delay circuit

25: memory controller 26: input and output selection controller

23B, 24B: Memory CH-A, CH-B: Head

The present invention relates to the stabilization of the reproduction signal of a recording / reproducing apparatus using a rotating head. In particular, two field signals are simultaneously read during one field period while the tape is stopped, and an extra signal is stored for output during the next one field period. Therefore, the present invention relates to a recording / reproducing apparatus irrespective of a change in tape speed, which can prevent deterioration of a reproduced signal even if the moving speed of the tape is uneven.

FIG. 1 shows the running direction of a general tape and the direction in which two heads alternately read a track. The track 2 on which the video signal is recorded on the tape 1 traveling in the direction of the arrow A is configured to be inclined obliquely in the longitudinal direction of the tape. Two rotary heads CH-A and CH-B mounted at a head drum (not shown) with a 180 ° difference are used to record or record a video signal on the track 2 by alternately tracing the track 2. The read video signal is read out.

2 shows the configuration of a recording / playback apparatus using a conventional rotating head. As shown, the recording and reproducing apparatus includes a tape moving servo apparatus 11 for driving the tape 1 at a constant speed, and two heads CH-A mounted on the head drum by rotating the head drum 3. The rotating head servo device 12 which moves (CH-B) in the state stuck to tape is provided. The head selector 13 connected to the rotary head servo device 12 determines the positions of the heads CH-A (CH-B) and finds a head that traces the current track among the two heads. Will be controlled. The switching unit 14 is switched according to the control signal of the head selector 13 to alternately apply the video signals to the two heads CH-A (CH-B) or to receive the video signals from the two heads. Output to the processor 15. The signal processor 15 processes an image signal to be recorded on a tape and outputs the image signal to the switching unit 14 or reproduces and outputs an image signal applied through the switching unit 14.

The conventional recording and reproducing apparatus configured as described above records the video signal output from the signal processor 15 on the tape while the tape and the head move at a constant speed by the tape moving servo device 11 and the rotating head servo device 12. The video signal read from the tape is reproduced by the signal processing unit 15 and output. In this case, the switching unit 14 is switched according to a signal output from the head selecting unit 13, that is, a control signal indicating a position of a head that traces the current track among the two heads, and transmits the image signal.

FIG. 3 shows the output waveform of each rotating head and the displacement of the tape in FIG. 2, and (a) shows the output signal waveform of each rotating head CH-A and CH-B and the two output signals. (B) is a state diagram showing the displacement of the tape in accordance with the output time of the rotating head. As shown in the figure, since the movement displacement of the tape is uneven due to the change in the tape traveling speed, the video signal reproduced through each rotating head also appears unevenly. The conventional recording and reproducing apparatus alternately records or reproduces video signals on each track by matching the position of the head to the combined trajectory of the rotational head speed and the tape movement speed. The precision of the track formed at this time depends on the precision of the moving speed of the tape and the rotating speed of the rotating head. In general, the accuracy of the tape movement speed is relatively poorer than the rotational accuracy of the rotating head, so the nonuniformity of the tape movement displacement as shown in FIG. 3 results in nonuniformity of the reproduced video signal.

Therefore, according to the conventional method, not only does the video signal reproduced by the non-uniformity of the tape moving speed, but also the video signal to be reproduced deteriorates in the playback mode at double speed or less than 1x speed. In order not to deteriorate the characteristics of the reproduction signal, a circuit for correcting the rotational speed of the head and the moving speed of the tape is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems as described above, and an object of the present invention is to read two field signals simultaneously during one field period while the tape is stopped, and then record an extra signal in the field memory and then record the next one field. The present invention provides a recording and reproducing apparatus that is independent of tape speed fluctuation so as to prevent deterioration of a video signal to be reproduced by outputting it during a period.

Another object of the present invention is to form a track to be recorded or played back regardless of the tape moving speed so that the tape speed does not affect the recorded or played signal, and the rotational speed of the head is not required to be corrected at any speed. An object of the present invention is to provide a recording and reproducing apparatus irrespective of the tape speed variation to be released.

The recording and reproducing apparatus independent of the tape speed fluctuation of the present invention for achieving the above objects includes a rotating head servo device for moving two heads mounted adjacent to each other, and a tape moving servo for intermittently moving the tape by a desired number of tracks. With a device. The first and second delay circuits are connected to the rotating head servo device, and the first delay circuit delays the video signal read through the second head by one track and outputs it to the switching unit. The second delay circuit passes through the switching unit during recording. The video signal of the applied signal processor is delayed by one track and output to the second head. The memory control unit connected to the first and second delay circuits receives a head position discrimination signal from a rotating head servo device to control read / write operations of the first and second delay circuits. An input / output selection control unit which receives the head position discrimination signal from the rotating head servo device and outputs a signal for controlling the switching unit, is connected to the switching unit and has an image signal between the signal processing unit and the first head, the first delay circuit, and the second delay circuit. Will be delivered. At this time, the first and second heads are mounted in parallel to each other at a predetermined position of the head drum to simultaneously trace a plurality of tracks during one track period, and the tape moving servo device reads image signals through the first and second heads. Or tape recording is stopped.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 4 through 6.

4 is a block diagram of the recording and reproducing apparatus irrespective of the tape speed variation of the present invention. As shown, the recording and reproducing apparatus of the present invention rotates the head drum 3 to move the two heads CH-A (CH-B) mounted on the head drum in a state in which the head drum 3 is in close contact with the tape. The servo apparatus 21 and the tape moving servo apparatus 22 which receives the head position determination signal from the rotating head servo apparatus 21, and makes the tape 1 run at a constant speed is provided. In the rotary head servo device 21, the head CH-A is connected to one terminal of the switching unit 27, and the other head CH-B is an analog / digital converter 23A and a digital / analog converter. Respectively connected to 24C.

The analog / digital converter 23A converts the analog video signal output through the head CH-B into a digital signal, and the memory 23B connected to the output terminal of the analog / digital converter 23A includes a memory controller ( According to the output signal of 25), the input image data is stored and the stored data is output. A digital / analog converter 23C is connected to an output terminal of the memory 23B, and the digital / analog converter 23C converts the video data output from the memory 23B into an analog video signal and outputs the analog video signal. As described above, the delay circuit 23 composed of the analog / digital converter 23A, the memory 23B, and the digital / analog converter 23C stores one video track read through the head CH-B during playback. The delay is output to the other terminal of the switching unit 27.

The analog / digital converter 24A connected to the digital / analog converter 23C and the other terminal of the switching unit 27 receives the analog video signal of the signal processor 28 output through the switching unit 27. Convert to The memory 24B connected to the output terminal of the analog / digital converter 24A stores the input image data according to the output signal of the memory controller 25 and outputs the stored data. A digital / analog converter 24C is connected to an output terminal of the memory 24B, and the digital / analog converter 24C converts the image data output from the memory 24B into an analog video signal to rotate the servo head 21. Output to the head CH-B). As described above, the delay circuit 24 composed of the analog / digital converter 24A, the memory 24B, and the digital / analog converter 24C is applied to the signal processor 28 applied through the switching unit 27 during writing. The video signal is delayed by one track and outputted to the head CH-B.

The memory controller 25 receives the head position discrimination signal from the rotating head servo device 21 and controls the read / write operations of the memories 23B and 24B accordingly. The input / output selection control unit 26 connected to the rotary head servo device 21 receives a head position discrimination signal and outputs a signal for controlling the switching unit 27, and the switching unit 27 of the input / output selection control unit 26 is used. Switched according to the control signal to transfer the video signal between the signal processor 28, the head (CH-A), the digital / analog converter 23C, and the analog / digital converter 24A. The signal processing unit 28 connected to the switching unit 27 processes the image signal to be recorded on the tape and outputs it to the switching unit 28 or reproduces and outputs the image signal applied through the switching unit 28.

The operation of the recording / playback apparatus independent of the tape speed fluctuation of the present invention configured as described above will be described with reference to FIG. 5 and FIG.

When the tape and the head are moved at a constant speed by the tape moving servo device 22 and the rotating head servo device 21, the video signal output from the signal processor 28 is recorded on or read from the tape. It is reproduced at 28 and output.

5 is a structural diagram showing a position where the rotating head is mounted in the recording and reproducing apparatus of the present invention, (a) is a perspective view of the head drum, and (b) is a state view from above where the rotating head reads the track. As shown in FIG. 5 (a), two heads CH-A (CH-B) are mounted in parallel adjacent to each other at a predetermined position of the head drum 3, and in FIG. 5 (b), As described above, the head CH-A (CH-B) simultaneously traces a plurality of tracks on the tape 1.

First, when the operation at the time of reproduction is clarified, in the section A in which the head CH-A (CH-B) reads a plurality of tracks in FIG. 5B, the tape movement servo device 22 travels the tape. Is stopped, so only the head CH-A (CH-B) moves. The output waveform of each rotating head CH-A (CH-B) and the displacement of the tape are shown in FIG. 6, and the heads read discontinuously and simultaneously as shown in (a) and (b) of FIG. Of the video signals of CH-A (CH-B), the video signal read through the head CH-B is applied to the delay circuit 23 to delay by one track. Here, (c) of FIG. 6 shows the movement displacement of the tape. Even if the movement displacement of the tape is uneven due to the change in the tape traveling speed, the tape moves while the head CH-A (CH-B) reads the signal. Therefore, the reproduced video signal appears uniformly. The analog video signal input to the delay circuit 23 is converted into a digital signal by the analog / digital converter 23A and stored in the memory 23B. The input / output selection controller 26 receives a head position discrimination signal from the rotating head servo device 21, that is, signals indicating the positions of two heads CH-A and CH-B that trace the current track. 27). In the section A, since the switching unit 27 is switched to the terminal A by the control signal, the discontinuous image read through the head CH-A as shown in FIG. The signal is transmitted to the signal processor 28.

In FIG. 5B, when the head CH-A (CH-B) is in the section B, the tape moving servo device 22 intermittently operates only while the signal is output from the memory 23B. You will move the tape as many tracks as you want. In addition, the memory 23B operates in accordance with a read / write control signal output from the memory controller 25 to output image data read and stored by the head CH-B to the digital / analog converter 23C. It is converted into an analog video signal and applied to the switching unit 27. Since the input / output selection control unit 26 receives the head position discrimination signal from the rotating head servo device 21 and controls the switching unit 27 to switch to the terminal B, the memory 23B as shown in FIG. The output signal of the head CH-B delayed by one track is transmitted to the signal processor 28. As shown in (d) of FIG. 6, the signal processor 28 adds the output signal of the discontinuous head CH-A and the output signal of the delayed head CH-B to output a stable and continuous playback video signal. .

On the other hand, when the operation at the time of recording is explained, the signal processing unit 28 continuously outputs the video signal to be recorded through the head CH-A (CH-B). In FIG. 5B, when the head CH-A (CH-B) is in the section B, the tape movement servo device 22 intermittently operates only while the signal is stored in the memory 24B. Will be moved by multiple tracks. The input / output selection control unit 26 receives the head position discrimination signal from the rotating head servo device 21 and controls the switching unit 27 to switch to the terminal B, so that the continuous analog video signal output from the signal processing unit 28 is output. Is applied to the analog / digital converter 24A via the switching unit 27, where it is converted into a digital video signal and stored in the memory 24B.

In FIG. 5B, when the head CH-A (CH-B) is in the section A, the tape movement servo device 22 stops running of the tape. The memory 24B operates in accordance with the read / write control signal output from the memory control unit 25 to read out the stored image data of the signal processing unit 28 and output it to the digital / analog converting unit 24C, where it is converted into an analog video signal. Since it is converted and applied to the head CH-B, it is recorded on the tape in a state of being delayed by one track from the original signal supplied from the signal processing unit 28. At this time, the input / output selection control unit 26 receives the head position discrimination signal from the rotating head servo device 21 and controls the switching unit 27 to switch to the terminal A, so that the video signal continuously output from the signal processing unit 28 is obtained. Is applied to the head CH-A through the switching section 27 and recorded on the tape. Therefore, the output signal of the signal processing section 28 and the output signal of the digital / analog converter 24C delayed by the memory 24B are simultaneously recorded in the plurality of tracks through the head CH-A (CH-B).

As described above, the present invention simultaneously reads or records two field signals during one field period while the tape is stopped, and at this time, the extra signals are delayed by one field using a field memory to prevent degradation of the reproduced video signal. can do. In addition, the speed change of the tape does not affect the signal to be recorded or reproduced, so that the rotational speed of the head does not need to be corrected even in the reproduction mode at the double speed or the single speed or less.

Claims (10)

A recording and reproducing apparatus including a signal processing unit for outputting a video signal to be recorded or for reproducing and outputting a video signal, the recording and reproducing apparatus comprising: a rotating head servo device for moving two heads mounted adjacent to each other in a head drum in a state of being in close contact with a tape; ; A tape moving servo device which receives the head position discrimination signal from the rotating head servo device and moves the tape intermittently by a desired number of tracks; Delay means configured between one of the plurality of heads and a signal processor, for delaying and outputting an applied video signal by one track; An input / output selection control unit which receives a head position discrimination signal from the rotating head servo device and outputs a signal for controlling the switching unit; And a switching unit which switches according to an output signal of the input / output selection control unit and transfers an image signal between the signal processing unit, the first head, and the delay unit. The recording method of claim 1, wherein the first and second heads are mounted in parallel to each other at a predetermined position of the head drum and configured to simultaneously trace a plurality of tracks during one track period. Playback device. 3. The tape moving servo device of claim 2, wherein the tape moving servo device stops running of the tape in a section in which a video signal is read or recorded through the first and second heads, and in a section in which the first and second heads do not contact the tape. A recording / playback apparatus independent of tape speed fluctuation, characterized in that the tape is moved by a desired number of tracks. 3. The apparatus of claim 2, wherein the delay unit comprises: a first delay circuit for delaying the video signal read through the second head by one track during reproduction and outputting the delayed signal to the switching unit; A second delay circuit for delaying the video signal applied through the switching unit during recording by one track and outputting the delayed signal to the second head; And a memory controller which receives a head position discrimination signal from a rotating head servo device and controls read / write operations of the first and second delay circuits. The electronic device of claim 4, wherein the first delay circuit comprises: an analog / digital converter for converting an analog video signal output through a second head into a digital signal; A memory for storing image data output from the analog / digital converter and outputting the stored data according to the read / write control signal output from the memory controller; And a digital / analog converter for converting video data output from the memory into an analog video signal and outputting the analog video signal to a switching unit. 5. The apparatus of claim 4, wherein the second delay circuit comprises: an analog / digital converter for converting an analog image signal of the signal processor output through the switching unit into a digital signal; A memory for storing the image data output from the analog / digital converter and outputting the stored data and / or converting the image data output from the memory into an analog image signal according to the read / write control signal output from the memory controller to the second head. And a digital / analog converting section for outputting. The memory of claim 5, wherein the first delay circuit stores the video signal read through the second head in a memory in a section in which the video signal is read through the first and second heads during playback, and the first and second heads are taped. And a recording / playback apparatus independent of a tape speed change, in which the stored video signal is read and the output signal of the delayed second head is outputted to a switching unit in a section not contacted with the controller. 7. The method of claim 6, wherein the second delay circuit reads out the video signal delayed by the memory and outputs it to the second head in a section in which the video signal is read through the first and second heads during writing. A recording / reproducing apparatus independent of tape speed fluctuation, wherein a continuous video signal through a switching unit is stored in a memory in a section not in contact with the tape. 6. The apparatus of claim 5, wherein the switching unit transmits the discontinuous video signal read through the first head to the signal processor in a section in which the video signal is read through the first and second heads during playback. And a tape reproducing apparatus, irrespective of the tape speed fluctuation, in which the output signal of the second head delayed by one track is transferred to the signal processor in a section not in contact with the tape. 7. The apparatus of claim 6, wherein the switching unit transfers the video signal continuously output from the signal processing unit to the first head in a section in which the video signal is read through the first and second heads during recording, and the first and second heads are taped. And a recording / playback apparatus independent of tape speed fluctuation, wherein the continuous video signal output from the signal processor is switched to the analog / digital converter in a section not in contact with the tape.