JPS63166053A - Recorder - Google Patents

Abstract

PURPOSE:To simplify a control operation in the re-recording or the erasure of an index signal and to shorten a time for the operation, by performing the re-recording or the erasure of the index signal in a state where a magnetic tape stops. CONSTITUTION:The magnetic tape returns and stops to the completion point of the index signal by controlling motors 74 and 76 by a system controller 40, and only during a period of an index area signal IDAR, a switching circuit 35 is switched to an INDEX side. And switching circuits 31A and 31B are switched to REC sides, and at the time of re-recording, a new index signal is generated from an index processing circuit 70, and only one field is recorded on a desired position. At the time of erasure, a signal of all '0's is generated from the index processing circuit 70, and only one field is recorded on the desired position. After that, the tape is stepped by one field in a reverse direction, then, the same operation is repeated. In such a way, the control operation can be simplified, and also the time for the operation can be shortened.

Description

[Detailed description of the invention] The invention will be explained in the following order.

A. Field of industrial application B. Essentials of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem (Fig. 1) F. Effect G. Example 01 Description of rotary head device G2 Description of recording/reproduction system G3 Explanation of re-recording or erasing index signals H Effect of the invention A Industrial field of application This invention is a system in which information signals such as video signals and audio signals are recorded on a plurality of magnetic tapes together with index signals by a rotating magnetic head. The present invention relates to a recording device that sequentially records information on inclined tracks.

B. SUMMARY OF THE INVENTION This invention provides a magnetic tape in which one information signal is sequentially recorded along with an index signal on a plurality of inclined tracks by a rotating magnetic head, and another information signal is indexed following the - information signal by a rotating magnetic head. In a recording device that sequentially records signals on a plurality of inclined tracks, by re-recording or erasing the index signal while the magnetic tape is stationary, the control operation and time required for re-recording or erasing the index signal can be simplified. This is intended to shorten the time.

C. Prior Art Conventionally, in a recording device that sequentially records information signals such as video signals and audio signals onto a plurality of inclined tracks of a magnetic tape using a rotating magnetic head, an index signal used for cueing etc. is recorded along with the information signal. It is proposed that.

When re-recording or erasing the index signal recorded in this way, conventional tape running conditions could only be done at 1x speed in the forward direction. A conventional method of rerecording or erasing an index signal will be explained.

In Fig. 11, first start the program in step (b), then step (b), ' determine which direction the index signal is in from the current tape position. In step (c), a forward search is started, and as shown in FIG. 12, a search is performed over a plurality of tracks.

When the index signal is detected in step (d), tape running is stopped in step (e). The index signal ■ is 1 as shown by diagonal lines in Figures 12 and 13.
One index signal is spread over several tracks (several fields) in the video signal area AV and the PCM data area A.
It is inserted at the dubbing margin (postamble) between P. The index signal is detected at its starting point as shown in FIG.

At step (to), the tape is rewound to a predetermined f
tS and stops at step (g). Next, in step (H), as shown in Figure 12, enter the playback mode at 1x speed while fully applying the capstan servo, and in step (S), when the index signal start point is reached, the index signal is re-recorded from that point. Or, the index signal is erased, and the rerecording or erasure of the index signal during the forward search is completed in step (N).

Next, in step (b), if it is determined that the index signal is located after the current tape position, a backward search is entered in step (l), and a search is performed on a plurality of tracks as shown in FIG.

When the index signal is detected in step (H) (in this case, it is detected at the end point), tape running is stopped in step (W). Next, the first step (force)
As shown in Figure 3, enter playback mode without sufficiently applying the capstan servo at 1x speed, and when the index signal starts at step (Y), the index signal is re-recorded or erased from that point, and step (Y) is started. ) to finish rerecording or erasing index No. 6 during backward search.

D Problems to be Solved by the Invention By the way, in the conventional method as described above, when rerecording or erasing an index signal in a field unit at a desired position, the index signal is detected by searching the desired position. Since the method is rewound to a slightly earlier position and then set to playback mode, the desired number of fields are re-recorded or erased from the desired position, which has the disadvantage that control takes time and the operation is complicated.

The present invention has been made in view of the above, and an object thereof is to provide a recording device that can re-record or erase an index signal with simple control operations and in a short period of time.

E. Means to solve the problem A recording device according to the present invention has a rotating magnetic head HA.

The - information signal is sequentially recorded on a plurality of inclined tracks TA, TH by the HB on the magnetic tape (2) along with the index signal, and the rotating magnetic disk HA, HB indexes other information signals following the - information signal. The signal is sequentially recorded on a plurality of inclined tracks TA and TH,
The index signal is configured to be rerecorded or erased while the magnetic tape (2) is stationary.

F The action index signal is rerecorded or erased by the rotating magnetic disks HA, HH while the magnetic tape (2) is stationary.

This reduces the time required to re-record or erase the index signal, and also simplifies the control operation.

G. Embodiment Hereinafter, an example in which an embodiment of the present invention is applied to a so-called 8 mm video will be explained with reference to FIGS. 1 to 10.

61 Description of Rotary Head Device FIG. 5 shows an example of a rotary head device. In the figure, HA and HB are rotary magnetic heads for recording and reproducing, and their azimuth angles are different from each other.
The drums (
1) with the frame frequency slightly protruding from the peripheral surface (3
0)lx) in the direction of the arrow (3H).

Further, the magnetic tape (2) is wound diagonally around the circumferential surface of the drum (1) over an angular range of 221°, and is run at a constant speed in the direction of the arrow (3T).

Therefore, tracks TA and TB having a length of 221 degrees are alternately formed on the magnetic tape (2) and signals are recorded thereon.

Here, in the normal mode, as shown in FIG.
An audio signal related to one field of the video signal is converted into PCM and recorded in a time-axis compressed state in an area AP corresponding to an angular range of about 36 degrees from the time when A and HB start scanning, A video signal for one field is recorded in the subsequent area AV for an angular range of 180°. The remaining 5° is magnetic herad HA, HB is magnetic tape (2)
This is the margin period when separating from the

In addition, when in the PCM multi-trunk mode, as shown in FIG. Two divided track areas AP2 to APG are provided. Then, in each of these six divided track areas AP1 to APe,
Audio signals for one field period are converted into PCM and recorded in a time-axis compressed state. Therefore, in this mode, one channel of audio signals can be recorded in one divided track area.

The normal mode track format shown in FIG. 6 will be described in more detail as shown in FIG. 8. In the figure, magnetic heads HA and HB are connected to magnetic tape (2).
From the right side, where the magnetic heads HA and HB begin to come into contact, the rotation angle of the magnetic heads HA and HB corresponds to 5° as a plunge part (11).
The latter half of 2.06" (corresponding to 3H (H is horizontal period) of the video signal) is a preamble section (12) which is a clock run-in part synchronized with the following PCM data. Following this preamble section (12),
The period of 26.32° is the PCM data section (13) in which the PCM data of the time-axis compressed audio signal is recorded.
It is said that

Following this PCM data section (13) <2.06" (3H
) period is the postamble section (1
4), and the subsequent 2.62° period serves as a guard section (15) between the video signal section and the PCM data section. A period <180' following the guard section (15) is a video signal section (16) in which one field's worth of video signal is recorded. Furthermore, the subsequent 5° is the separation area (
17).

Further, the track format of the PCM multi-trunk mode shown in FIG. 7 will be explained in more detail as shown in FIG. 9. Each divided track area A P 1 to AP
s is exactly the same as the area AP of the normal mode track format shown in FIG. 8; entry section (21), preamble section (22), PCM data section (23), postamble section (24), guard section. (25).

The track formats of the normal mode and the PCM multi-track mode are as described above, and an index signal is recorded in, for example, the postamble section (14) or (24) of each track format, as will be described later.

G2 Explanation of record residing thread FIG. 1 shows the configuration of the recording/reproducing system.

In the same figure, (31^) and (31B) are recording/reproduction changeover switch circuits, which are supplied with a switching control signal from the system controller (40) and are switched to the RBC side during recording and to the P during playback.
Switched to B side.

Further, (32) and (33) are head changeover switch circuits, which receive a changeover control signal R from the system controller (40).
FSW is supplied, and the state shown in the figure and its opposite state are 1/2
Switched every rotation period. This switching control signal RFS
W is the system controller (4) from the pulse generator PG.
0) is formed based on the pulse Prtn of 3011z indicating the rotational phase of the magnetic head HASHB,
This is a rectangular wave signal with a duty of 50%. Here, with respect to the switching control signal RFSW in the normal mode, the switching control signal RFSW in the PCM multi-track mode is phase-shifted according to the designated divided track area.

i.e., depending on the specified split trunk area, 36°
(rl-1) (n is an integer corresponding to the number of the divided track area, and when A P t to APe, respectively (1=a l to 6
).

Note that this switching control signal RFSW is also supplied to the PCM audio signal processing circuit (62), and a PCM area signal indicating the designated divided track area is formed.
Data is successively read and written from the RAM in a period specified by the M area signal. Further, a control signal is supplied by the system controller (40) to the capstan motor (74) via the capstan servo circuit (73) and to the reel motor (76) via the reel servo circuit (75). .

Below, the recording system will be explained first.

A human video signal through an input terminal (51) is supplied to a video signal system (50) for processing, and its output, a recording video signal, is supplied to a switch circuit (32). This switch circuit (32) is switched every 1/2 rotation of the magnetic heads HA and HB by the switching control signal RFSW, and in addition, the magnetic heads HA and 11B have a phase servo with the pulse Pss as a reference phase (not shown). Therefore, when the magnetic head HA scans the area AV shown in FIG.
) and a switch circuit (31^), the recording video signal is supplied to the magnetic head HA and recorded in the area AV of the recording track TA. Similarly, when the magnetic head HB scans the area AV, the recording video signal is supplied to the magnetic head HB through the switch circuit (32), the recording amplifier (34B), and the switch circuit (31B), and the area of the recording track TB is Recorded on AV.

In addition, the left and right channel audio signals are input to the PCM signal system (60
) is supplied to the PCM audio signal processing circuit (62), where it is converted into PCM data. That is, the audio signal is digitized, and each field of the digital signal is divided into 132 blocks as shown in FIG. 10, and error correction codes P parity and Q parity are generated. A CRC code is generated for each block.

Then, the data for one field is compressed on the time axis to about 115, and a synchronization signal 5YNC and a block address word ADR3 are added to each block, so that each block is in the state shown in FIG. 10. Switching control signal 1? It is read out during the period of the PCM' area signal formed based on the FSW. One block consists of a 3-bit block synchronization signal 5YNC, an 8-bit block address word ADR3, 8-bit parity words P and Q for error correction, and an 8-word audio data word W.
It consists of O-W7 and a 16-bit CRC code for error detection. CRC code is address word ADR
3 to data word W7.

The PCM data read out during the period of the PCM area signal is modulated into a 5.8M)lz signal for "1" and a 2.9M2 signal for "0". This modulated No. 13 is supplied to a switch circuit (32) via the AD side of a switch circuit (35), which will be described later. Then, the switching control signal RF
When the magnetic head HA scans the area AP in FIG. 6 described above by switching by the SW, the switch circuit (32),
The PCM audio signal is supplied to the magnetic field HA through the recording amplifier (34^) and the switch circuit (31^), and is recorded in the area AP of the recording track TA. Similarly, when the area AP-t-magnetic field HB scans,
The PCM audio signal is supplied to the magnetic head HB through the switch circuit (32), the recording amplifier (34B), and the switch circuit (31B), and the PCM audio signal is supplied to the magnetic head HB in the area A of the recording track TH.
Recorded in P.

In addition, in the PCM multi-track mode, the switching control signal RFSW is set to 36 times according to the designated divided track area.
Since the signal is shifted by an integral multiple of ° and a PCM area signal is formed from this, when the magnetic head HA scans a designated divided track area among the divided track areas A P 1 to A P c in FIG. , switch circuit (
32), recording amplifier (34A) and switch circuit (3
1^) through which the PCM audio signal is transmitted to the magnetic field HA.
and recorded in designated divided track areas of the recording track TA. Similarly, when the magnetic head HB scans the designated divided track area, the PCM audio signal is supplied to the magnetic head HH through the switch circuit (32), the recording amplifier (34B), and the switch circuit (31B), and the recording The data is recorded in the designated divided track area of the track TH.

Further, (70) is an index processing circuit, and the index signal from now on is input to the IN of the switch circuit (35).
Supplied to the DEX side. And this switch circuit (3
5), the postamble section (14) or (24) (see Figures 8 and 9) is sent from the system controller (4o).
An index area signal IDAR corresponding to a partial section (see figure) is supplied, and this section switch circuit (35)
is switched to the INDEX side. Therefore, if the index re-recording button (71) is pressed in the postamble section (14) or 24) and the index re-recording mode is set, the index signal is re-recorded. Further, when the index erase button (72) is pressed to enter the index erase mode, all "0"s are recorded instead of the index signal.

In other words, the previously recorded index signal is erased.

Next, the reproduction system will be explained. Even during reproduction, drum phase servo is applied based on the pulse Psg. Furthermore, in the case of 8 mm video, although not shown in the figure, so-called 4-frequency pilot signals are cyclically recorded on the recording tracks TA and TB, so the tracking servo is applied using these 4-frequency pilot signals. .

During normal mode reproduction, reproduction signals from the magnetic heads HA and HB are supplied to the switch circuit (33) via reproduction amplifiers (36A) and (36B), respectively. This switch circuit (33) then receives a switching control signal R.
Since the FSW switches the magnetic heads HA and HB every 1/2 rotation, the video signal from the area AV is supplied to the video signal system (50), and the PCM audio signal from the area AP is supplied to the PCM signal system (60). be done.

In the video signal system (50), the reproduced video signal is processed in the opposite manner to that in the recording system, and an output video signal is derived from the output terminal (52). Also, P
In the CM signal system, a reproduced PCM audio signal is supplied to a bit synchronization circuit (65) through a reproduction equalizer circuit (63) and a limiter (64). This bit synchronization circuit (65) includes a D flip-flop (66) and a PLL circuit (
67), and data of rlJ rOJ modulated as described above is obtained from the D flip-flop (66). This is then supplied to the PCM audio signal processing circuit (62), where it undergoes error detection, correction, time axis extension, etc., and is returned to the analog audio signals of the left and right channels. ) is derived.

Also, during playback in the PCM multi-trunk mode, the playback signals from the magnetic heads HA and )IB are sent to the switch circuit (3) via the playback amplifiers (36^) and (36B), respectively.
3). And this switch circuit (33)
is switched by the switching control signal RFSW whose phase is shifted by an integer multiple of 36° according to the designated divided track area.
The M audio signal is supplied to a PCM signal system (60). Then, in the PCM audio signal processing circuit (62), the PCM audio signal from this designated divided track area is processed.
Error detection and correction for audio signals, time axis correction,
After the length etc. are done, it is returned to the analog audio signal of the left and right channels, and this is sent to the output terminals (68L) and (68R).
) is derived.

In the reproduction mode, the index processing circuit (70) detects the index signal during the period of the index area signal IDAR from the system controller (40) from the output of the bit synchronization circuit (65), and when detected, the detection signal is sent to the system controller (40).

Description of re-recording or erasing G3 index signal The method of re-recording or erasing the index signal will be explained with reference to FIGS. 1 to 4. In Figure 2, first step (
Start the program in b) and press the index re-record button (71) or index erase button (72) depending on whether you want to re-record or erase the index signal. In step (b), the system controller (40) determines in which direction the index signal is located from the current tape position.
), and if it is in the front, a forward search is entered in step (c), the motors (74) and (76) are controlled, and a search is performed over a plurality of trunks as shown in FIG.

During this time, the index processing circuit (70) detects the index signal from the output of the bit synchronization circuit (65). When the index signal is detected in step (d), it is transmitted to the system controller (40), and the system controller (40) controls the motors (74) and (76) in step (e). Stop tape running. As shown by diagonal lines in FIGS. 3 and 4, the index signal I is a post-recording margin (postamble) that is located between the video signal area AV and the PCM data m area AP over several tracks (several fields). ) is inserted. In this case the index signal is detected at its starting point as shown in FIG.

In step (to), the system controller (40) controls the motors (74) and (76) to return to the end point of the index signal and stop, as shown in FIG. Then, in step (G), with the tape stopped, the switch circuit (35) is turned ON during the period of the index area signal IDAR! When switching to the X side, the switch circuit (31A)
and (31B) to the REC side, and in the case of re-recording, a new index signal is generated from the index processing circuit (70) and one field is recorded at the desired position, and in the case of erasing, the index processing circuit (70) generates a new index signal. An all "0" signal is generated from (70) and recorded for one field at a desired position.

In step (H), the system controller (40) controls the motors (74) and (76) to step-feed the tape by one field in the reverse direction and repeat the same operation as described above. In step (S), the system controller (40) determines whether rerecording or erasing of the index signal has been completed over the desired field, and if it has not been completed, returns to step (G) and repeats the same operation as described above. However, if the process has been completed, the process proceeds to step (N), where the rerecording or erasing of the index signal in the forward search is completed.

Next, in step (b), if it is determined that the index signal is after the current tape position, in step (l), the backward search is started, the motors (74) and (76) are controlled, and the process shown in FIG. Search across multiple tracks as shown.

During this time, the index processing circuit (70) detects the index signal from the output of the bit synchronization circuit (65). When the index signal is detected in step (W), this is transmitted to the system controller (40), and the system controller (40) controls the motors (74) and (76) in step (W). Stop tape running. In this case, the index signal is detected at its end point as shown in FIG.

In step (force), the system controller (40) controls the motors (74) and (76) to advance to the start point of the index signal and stop, as shown in FIG. Then, with the tape stopped at step (day), the switch circuit (35) is activated for the period of the index area signal 111AR.
Switch to the INDEX side and switch circuit (318)
and (31B) to the RF, C side, and in the case of re-recording, a new index signal is generated from the index processing circuit (70) and one field is recorded at the desired position, and in the case of erasing, the index signal is A signal of all "0" is generated from the processing circuit (70) and recorded for one field at a desired position.

In step (ri), the system controller (40) controls the motors (74) and (76) to step-feed the tape in the forward direction by l fields, and repeats the same operation as described above. In step (S), the system controller (40) determines whether re-recording or erasing of the index signal has been completed over the desired field or not, and if it has not been completed, the system controller (40) returns to step (Y) and performs the same operation as described above. If the process is repeated and the process is completed in step 5, the process proceeds to step (N) to finish rerecording or erasing the index signal in the backward search.

Although the above-described embodiment is an example in which the present invention is applied to an 8-video tape recorder, it can be similarly applied to other rotating head type video tape recorders.

11 Effects of the Invention As described above, according to the present invention, since the index signal is re-recorded or erased while the magnetic tape is stationary, the control operation for re-recording or erasing the index signal is simplified and the control operation is simplified. Time is also reduced.

Drawing w11! Explanation: Figure 1 is a configuration diagram of the recording and reproducing system, Figures 2 to 4 are diagrams for explaining when re-recording or erasing index signals, $5
The figure shows the configuration of the rotary head device, Figures 6 and 7 show the recording track pattern, Figures 8 and 9 show the track format, and Figure 1θ is an explanatory diagram of the data structure of the PCM signal. , FIGS. 11 to 13 are diagrams for explaining the conventional rerecording or erasing of index signals.

(2) C magnetic tape, (40) system controller, (50) video signal thread, (60) PCM signal system, (70) index processing circuit, (71) index re-recording button, (72) is the index deletion button.

Claims (1)

[Scope of Claims] One information signal is sequentially recorded on a plurality of inclined tracks together with an index signal by a rotating magnetic head, and the other information signal is recorded following the one information signal by the rotating magnetic head. 1. A recording device that sequentially records index signals on a plurality of inclined tracks, characterized in that the index signals are rerecorded or erased while the magnetic tape is stationary.