JP2750984B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus such as a video tape recorder (hereinafter referred to as "VTR"), and more particularly to an auto-tracking type camera-integrated VTR.
And the like.

[0002]

2. Description of the Related Art FIG. 8 shows a recording pattern of a pilot signal in a conventional VTR of an automatic tracking system.
FIG. 9 is a block diagram showing a circuit for reproducing an auto tracking signal.

A reproduced pilot signal included in a reproduced RF signal from the tape 51 is a crosstalk component obtained by adding a pilot signal recorded on both adjacent tracks in addition to a pilot signal recorded on a main scanning track. Is reproduced as a synthesized signal. This synthesized signal and the reference signal generated by the reference signal generation circuit 52 are balanced-modulated, and a difference signal between the two input signals is taken out by respective tuning circuits (not shown) of fH and 3fH. Thereafter, the difference signals are detected and rectified by the band-pass filters BPF53 and BPF54, respectively, and their levels are compared. Level comparator 55
Since the output change corresponds to the tracking shift amount, the tracking is automated based on this output change. As described above, the pilot signal is generally used only for the purpose of controlling the tracking. An example in which a pilot signal is applied to purposes other than tracking control in a VTR is that a non-recording portion is provided for one of four types of pilot signals as disclosed in JP-A-62-73448. Proposals have been made to feature.

[0004]

It is necessary to search for a position on the tape, in particular, a position on the tape at the end of recording, for a splicing of the tape. The position at the end of recording is roughly determined by a tape counter that counts the number of rotations of the tape reel from the start of tape winding, a rotation cycle, or a time counter (linear tape counter) that accumulates the recording time from the start of tape winding Can be searched. However, these methods have a low search accuracy, and once a tape is removed, these counters are initialized, so that a later search when a tape is set takes a long time.

For such a purpose, Japanese Patent Application Laid-Open No.
No. 73448 proposes to form a non-recording portion for one pilot signal among the four types of pilot signals as described above. However, in this publication, when a circuit in which one pilot signal is not generated exists in the circuit, there is a possibility that the detection means of a predetermined portion detects this and erroneously determines that the end of the tape has occurred. Further, with such a method, it is not possible to use a plurality of detection points.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides an automatic tracking type magnetic recording / reproducing apparatus capable of quickly and accurately searching for a recording end position. That is.

[0007]

According to the magnetic recording / reproducing apparatus of the present invention, four kinds of predetermined pilot signals are sequentially and repeatedly recorded on each track of the tape in accordance with a predetermined rule. An auto-tracking type magnetic recording / reproducing apparatus for taking out a pilot signal recorded on a track and controlling tracking, comprising: recording means for recording four types of pilot signals on each track of a tape; Instructing means for instructing termination, and controlling the recording means in response to the instruction output of the instructing means so that a period during which no pilot signal is recorded occurs in recording four types of pilot signals on each track during a predetermined period. And control means for performing the control. According to the magnetic recording / reproducing apparatus of the second aspect, in addition to the configuration of the first aspect, the four types of pilot signals are sequentially and sequentially recorded on each track.
One period is formed, and the control means controls one of the successive periods.
The recording means is controlled so as not to record all four types of pilot signals in one cycle. In the magnetic recording / reproducing apparatus according to the third aspect of the present invention, in addition to the configuration of the first aspect, one cycle is obtained by sequentially recording four types of pilot signals on each track. The control means controls the recording means so as not to record different pilot signals in each of four consecutive periods. Claim 4
In the magnetic recording / reproducing apparatus according to the present invention, four kinds of predetermined pilot signals are sequentially and repeatedly recorded on each track of the tape in accordance with a predetermined rule, and the pilot signals recorded on each track are taken out during reproduction. Recording means for recording four types of pilot signals on each track of a tape, instructing means for instructing termination of recording on the tape, and instructing means And control means for controlling the recording means so that the recording of the four types of pilot signals on each track during a predetermined period follows a rule different from a predetermined rule. One cycle is formed by sequentially recording four types of pilot signals on each track, and the control means determines that one pilot signal is replaced by three other types of pilot signals in one of the continuous cycles. The recording means is controlled so as to record on a part of each track to be recorded. According to a fifth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, there are provided four types of pilot signals recorded on each track of the tape during reproduction. Detecting means for detecting that the predetermined rule is not followed, and stopping means for stopping the running of the tape at a recording end position on the tape in response to a detection output of the detecting means, further comprising: I do.

[0008]

According to the first aspect of the present invention, a period in which no pilot signal is recorded occurs in recording four types of pilot signals on each track during a predetermined period in response to an instruction to end recording on the tape. The recording means is controlled as described above. According to the second aspect of the present invention, the recording means is controlled so that the pilot signal is not recorded over the entire period. According to the third aspect of the present invention, four consecutive
The recording means is controlled so as not to record different pilot signals in each of the three periods. According to the fourth aspect of the present invention, the recording means is controlled so that one pilot signal is recorded on a part of each track on which the other three types of pilot signals are to be recorded in one of the continuous periods. In the magnetic recording / reproducing apparatus according to the fifth aspect of the present invention, when it is detected that four types of pilot signals recorded on each track of the tape do not conform to a predetermined rule during reproduction, the tape travels. Stopped.

[0009]

【Example】

[First Embodiment] FIG. 1 is a block diagram showing a configuration of a camera-integrated VTR according to a first embodiment of the present invention.

In the figure, a camera-integrated VTR is a CC
A head unit 2 for amplifying an RF signal from a reproducing head that has read the tape 12, and a predetermined signal process for the RF signal amplified by the head amplifier unit 2. Y / C circuit 3 to perform and tape 1
2, a tape drive 4 for driving the tape drive 2, a CPU 5 comprising a microprocessor or the like for controlling each section, a reel pulse generating circuit 6 for outputting a pulse according to the reel rotation of the tape 12, and a pilot read from the tape 12. A tracking signal processing circuit 7 for recording and reproducing a signal; a control circuit 8 for controlling a pilot signal to be recorded in accordance with a certain regularity in accordance with an instruction of the CPU 5 during recording; and a rule for intermittently recording the pilot signal during reproduction. A key operation unit 10 for giving various operation instructions such as recording start, stop, reproduction, rewind, and fast forward, and a reel pulse generation circuit 6 at the end of recording. And a storage circuit 11 for storing the output pulse period.

Next, the operation at the end of recording according to the first embodiment of the present invention will be described.

At the time of normal recording, the recording pattern of a pilot signal as shown in FIG. 8 is the same as the conventional example. A tracking signal processing circuit 7 for recording and reproducing a pilot signal records the pilot signal on a tape together with video and audio data. Here, it is assumed that an instruction to temporarily stop recording on the tape is given from the key operation unit 10. At this time, the CPU 5 instructs the head amplifier unit 2 so that the pilot signal to be recorded in the control circuit 8 is intermittent according to the irregularity shown in FIG.

FIG. 2 is a diagram showing a recording pattern of the pilot signal after the pilot signal is recorded intermittently according to a certain irregularity according to the first embodiment of the present invention.

That is, as shown in FIG.
The cut signals (f1 to f4) have a period T ₁~ T_FiveFor each of
One cycle of repeated recording on each track
T_ThreeOnly the pilot signal is unrecorded,
Kind of pilot signal is recorded repeatedly on each track.
I will go.

In this case, tracking information for one cycle cannot be obtained. However, in the prior art, this is only handled in the same manner as when a reproduced RF signal is lost due to dropout or the like. Will not be disturbed. As described above, since the video / audio signal is normally recorded and the pilot signal serving as the tracking signal is not recorded for one cycle, the recording stop position during reproduction can be easily detected.

FIG. 3 shows a flowchart of the detection operation by the CPU 5 in this case.

First, when the reproducing operation is started, a pilot signal is detected. In step S1, it is detected whether or not the pilot signal is recorded. The fact that no pilot signal is recorded here means that the pilot signal is not recorded in FIG.
Is the same as when the level detection of two signals input to the level comparator 55 is 0. Step S1
In step S2, if a pilot signal is recorded, it is determined in step S2 whether the value of the counter is 4. If the value of the counter is not 4, the value of the counter is initialized to 0 in step S4, and the process proceeds to the determination of the next pilot signal.

If it is determined in step S1 that no pilot signal has been recorded, step S5
It is determined whether or not video / audio data is recorded. If these data are not recorded, they are processed as dropouts in step S7,
The operation proceeds to the next pilot signal detection operation. On the other hand, if the video / audio data is stored in step S5, in step S6, the counter value is incremented by one, and then the operation proceeds to the detection operation for the next pilot signal.

[0019] By doing so, in a period T ₃ shown in FIG. 2, all four tracks, the pilot signal is not recorded, the counter value is 4. In this state, when the next period T _4, the first track i.e. the pilot signal f1 is determined to be recorded, the flow advances from step S1 to the step S2. Then, since the counter value is already 4 at that time, the flow proceeds to step S3, whereby the end position of the recording on the tape is detected. As described above, when the pilot signal for one cycle is set to the unrecorded state at the end of the recording as shown in FIG. 2, it is possible to detect the position of the tape at the end of the recording at the time of reproduction.

Thereafter, the CPU 5 stops the tape. At that time, it receives information from the reel pulse generation circuit 6 that outputs a pulse according to the reel rotation of the tape,
The storage circuit 11 stores the cycle of the reel pulse immediately before the tape stops.

Next, it is assumed that the tape is rewound and the recorded video is reproduced, and then it is desired to take a continuous shot again from the end of the previous recording. When an instruction to that effect is given from the key operation unit 10, the CPU 5 rotates the tape and first measures the cycle of the reel pulse. Since the storage circuit 11 stores the cycle of the reel pulse at the end of the recording, the relative position of the tape to be searched can be determined by comparing the two. While making this determination, the tape is moved at a high speed, the tape is stopped at a position slightly before the same position, and an instruction is issued to start a normal reproduction operation.
At that time, the recording end position is accurately detected by the procedure shown in FIG. 3, and the CPU 5 stops the tape and starts recording preparation.

Thereafter, when the recording operation is started, it is possible to record a video completely and accurately connected to the previously recorded video data. In this way, even if the tape position is shifted, the tape position at the end of recording can be searched with one operation instruction, and high-quality continuous shooting can be performed. [Second Embodiment] Next, a second embodiment of the present invention will be described. The normal recording operation and the operation for temporarily stopping the reproduction and then preparing for the next recording as a splicing photograph are described above. Since it is the same as the first embodiment, the description here will not be repeated.

[0023] In this embodiment, as shown in FIG. 4, constituting each of four periods T ₁ through T ₄ of the four pilot signals (f1-f4) are recorded sequentially repeated each track In each track, one type of pilot signal is not recorded, and thereafter, four types of pilot signals are sequentially and repeatedly recorded on each track in the same manner as usual. That is, in the period T _1, the pilot signals in each track to the pilot signal f1 is recorded is not recorded, in the period T _2, the pilot signal f2 is not recorded, in the period T _3, the pilot signal f3 There is not recorded, in the period T _4, the pilot signal f4 is not recorded.

In this case, tracking information is partially lost over four periods from T ₁ to T ₄ , but similarly to the first embodiment, in the past, in such a case, processing such as dropout is performed. The tracking operation is not disturbed because it is handled in the same manner as when the reproduced RF signal is lost. As described above, since the video / audio signal is normally recorded and only the pilot signal is unrecorded in a certain pattern over four periods, it is easy to detect the recording stop position during reproduction.

FIG. 5 shows a flowchart of the detection operation by the CPU 5 in this case.

When the pilot signal detecting operation is started, first, in step S11, the pilot signal f1 is set for one cycle period.
To f4 are recorded. The fact that no pilot signal is recorded is equivalent to the fact that the level detection of two signals input to the level comparator in FIG. 9 is 0.

In the following description, a flowchart will be described based on the recording pattern of FIG. First, in one cycle period T _1, the pilot signal f1 is not recorded, the flow proceeds to step S15. Therefore, it is determined whether or not video / audio data is recorded.
If these data are not recorded, step S2
If it is 0, it is processed as a dropout. In this case, since these data are recorded, the flow proceeds to step S16, and it is determined whether or not the pilot signal f1 is recorded. In this case, since the pilot signal f1 is not recorded, the flow proceeds to step S21, and the individual flags corresponding to each of the pilot signals stored in the storage circuit 11 are specifically set so as to correspond to the pilot signal f1. Set to “1xxx”. Then, the counter value is set to 1 in step S22. The value of the counter in the previous period T _0, since the pilot signal f1 f4 are all recorded for, the flow advances to step S12, where the counter value is not 4, in step S14, the individual The flag is “00”
00 ”and the counter value is set to 0.

As described above, after setting the individual flag and incrementing the counter value in steps S21 and S22, the process proceeds to the process of determining the next pilot signal. In the next period of the period T _2, the pilot signal f2 is not recorded, the flow step S15 from step S11, S16 and S17
Then, the process proceeds to step S21. Then, similarly, after the individual flag corresponding to the pilot signal f2 is set, in step S22, the counter value is further incremented, and the process proceeds to the next pilot signal determination process. In period T ₁ here, already because the detection of the pilot signal f1 is performed, the value of the individual flag "11xx", and the counter value has a 2.

Similarly, in periods T ₃ and T ₄ ,
Performing the same process and proceeds to the individual flags "1111", and after the counter value became 4, the detection process of the recording condition of the track of the judgment or period T ₅ of the next pilot signal. In the period T _5, because it is all the pilot signals are recorded, the flow proceeds from step S11 to step S12, whether the counter value is 4 or not. As described above, since the counter value is 4 at this point, the flow proceeds from step S12 to step S13, and it is determined whether or not the individual flag is “1111”. Here, as described above, since the individual flag is "1111", the flow proceeds to step S23, and the position at the end of recording can be detected.

As described above, at the end of recording, one type of pilot signal is unrecorded for each of four periods of the recorded portion as shown in FIG. 4, and then four types of pilot signals are again recorded on each track. By performing recording in such a manner that the recording is repeated sequentially, it is possible to detect the position of the tape at the time of recording end at the time of reproduction. [Third Embodiment] Next, a third embodiment of the present invention will be described. Also in this embodiment, the normal recording operation,
The operation to start recording preparation for the next splicing after the recording is once stopped is the same as that of the first embodiment, and therefore the description thereof will not be repeated.

In this embodiment, four kinds of pilot signals (f1 to f4) are sequentially recorded on each track.
As shown in FIG. 6, among the periodic parts T _{1 to} T ₅ , the period T
_{In 2} , the pilot signal f1 is recorded on a part of the track where the pilot signals f2 to f4 are to be recorded. When the tape is reproduced, tracking is not disturbed because most other normal tracking information is recorded. As described above, since the video and audio signals are recorded normally and only the pilot signal is used as the same signal for a part of the track corresponding to one cycle, it is possible to easily detect the recording stop position during reproduction.

FIG. 7 shows a flowchart of the detection operation by the CPU 5 in this case.

In the following description, the recording pattern shown in FIG. 6 will be described as an example. When the pilot signal detecting operation starts, it is determined in step S31 whether or not the pilot signal is recorded on each track in the order of f1 to f4. In a period T _1, the pilot signals are recorded in this way, the flow proceeds to step S32, whether the counter value is 4 or not. In this case, since the counter value is not 4, step S
After the counter value is cleared to 0 at 34, the process proceeds to the next pilot signal determination process.

Next, in a period T ₂ , detection processing of a pilot signal is performed. First, when the detection process starts on the track where the pilot signal f1 is recorded, the flow proceeds to step S35, where it is determined whether or not the video / audio data is recorded. If these data are not recorded, it is processed as a dropout in step S37, but in this example, the flow is step S37.
Proceeding to 36, it is determined whether the pilot signal f1 has been detected. Since the pilot signal f1 has been detected, the flow proceeds to step S38, where the counter value is set to 1, and the flow proceeds to the determination of the next pilot signal.

The pilot signal f2 then in the period T ₂
The process proceeds to the process of detecting the track on which the signal is to be recorded. In this case, in step S36, since the pilot signal f1 is detected in the last part of the track in step S36, the flow proceeds to step S38, and after the counter value is set to 2, the process proceeds to the next pilot signal determination process. In the same manner, pilot signals f3 and f4 in the period T ₂ is relative to the track to be recorded, the detection process is performed.

[0036] When the detection processing of the pilot signal f4 is completed, the counter value in a state in which a 4, enters the detection processing of the pilot signal in the next period T _3. In a period T _3, the pilot signal, since it is recorded in order from f1 f4, the flow proceeds to step S32, whether the counter value is 4 is determined, as previously described,
In the detection processing of the pilot signal in the period T _2,
Since the counter value is 4, the flow proceeds to step S
At this point, the position of the tape at the end of recording can be detected.

[0037] In the second embodiment described above, the T ₄ from time T _1, in the order from sequence f1 pilot signal f4, was these signals unrecorded and, these unrecorded pilot The order of the signals may be other orders.

Further, in the third embodiment described above, in the period T _2, a portion of each track, was recorded pilot signals f1, instead of the pilot signals f1, continuously other pilot signals Needless to say, it may be recorded.

[0039]

According to the first to third aspects of the present invention, as described above, in the recording of the pilot signal on each track within the predetermined period in response to the instruction to end the recording on the tape, the period during which the pilot signal is not recorded is recorded. Since the recording means is controlled so as to cause the recording, the end position of the recording on the tape can be searched at high speed and with high accuracy. Claim 4
According to the invention, in one cycle, one pilot signal is recorded on a part of each track on which the other three types of pilot signals are to be recorded in response to an instruction to end recording on a tape. Since the means is controlled, it is possible to search for the end position of tape recording at high speed and with high accuracy. According to a fifth aspect of the present invention, when it is detected that the four types of pilot signals recorded on each track do not comply with a predetermined rule, the running of the tape is stopped. Preparations can be made to search quickly and accurately and to start subsequent recording easily without deterioration of image quality.

[Brief description of the drawings]

FIG. 1 shows a camera-integrated V according to a first embodiment of the present invention.
FIG. 3 is a block diagram illustrating a configuration of a TR.

FIG. 2 is a diagram showing a recording pattern of a pilot signal on a tape according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing specific contents of a pilot signal detecting operation of the CPU 5 according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a recording pattern of a pilot signal on a tape according to a second embodiment of the present invention.

FIG. 5 is a flowchart showing specific contents of a pilot signal detecting operation of a CPU 5 according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a recording pattern of a pilot signal on a tape according to a third embodiment of the present invention.

FIG. 7 is a flowchart showing specific contents of a pilot signal detection operation of a CPU 5 according to a third embodiment of the present invention.

FIG. 8 is a diagram showing a recording pattern of a pilot signal on a tape in a conventional auto-tracking type VTR.

FIG. 9 is a block diagram showing the configuration of a conventional auto-tracking signal reproducing circuit.

[Explanation of symbols]

 2 Head amplifier unit 4 Tape drive unit 5 CPU 7 Tracking signal processing circuit 8 Control circuit 9 Detection circuit 10 Key operation unit 11 Recording circuit 12 Tape Note that the same reference numerals in the drawings indicate the same or corresponding parts.

Claims (5)

(57) [Claims] 1. An auto-controller which performs four kinds of predetermined pilot signals repeatedly recorded on each track of a tape in accordance with a predetermined rule, and takes out the pilot signals recorded on each track during reproduction to control tracking. A tracking type magnetic recording / reproducing apparatus, comprising: a recording unit for recording the four types of pilot signals on each track of a tape; an instruction unit for instructing the end of recording on the tape; and an instruction output of the instruction unit. A magnetic recording / reproducing apparatus comprising: control means for controlling the recording means so that a period in which no pilot signal is recorded occurs in recording the four types of pilot signals on each track during a predetermined period. . 2. A cycle is formed by sequentially recording the four kinds of pilot signals on each track, and the control means controls the four kinds of pilot signals in one of the continuous cycles. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the recording unit is controlled so as not to record all of the information. 3. A cycle is formed by successively recording the four types of pilot signals on each track, and the control means outputs different pilot signals in each of the four successive cycles. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein said recording means is controlled so as not to record. 4. An auto-controller which performs four kinds of predetermined pilot signals repeatedly recorded on each track of a tape in accordance with a predetermined rule in order to take out pilot signals recorded on each track during reproduction and control tracking. A tracking type magnetic recording / reproducing apparatus, comprising: a recording unit for recording the four types of pilot signals on each track of a tape; an instruction unit for instructing the end of recording on the tape; and an instruction output of the instruction unit. Control means for controlling the recording means so that the recording of the four types of pilot signals on each track during a predetermined period follows a rule different from the predetermined rule. One cycle is formed by successively recording various kinds of pilot signals on each track, and the control means controls one of the continuous cycles. One pilot signals other three pilot signals for controlling the recording device to record a portion of each track to be recorded in the period, the magnetic recording and reproducing apparatus. 5. A detecting means for detecting that the four types of pilot signals recorded on each track of the tape during reproduction do not conform to the predetermined rule, and in response to a detection output of the detecting means. The magnetic recording / reproducing apparatus according to any one of claims 1 to 4, further comprising stopping means for stopping the running of the tape at a recording end position on the tape.