JPH02122403A - Rotary head type magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To shorten a time from the instruction of consecutive recording up to a recording start by recording digital signals at least including a tracking pilot signal on a track continuous to a recorded track by means of third and fourth heads immediately after an unrecorded part is detected by means of a detecting means. CONSTITUTION:A total head reproducing means 2 reproduces the recorded track by the all of first to fourth heads W1, R1, W2 and R2, and an unrecorded part detecting means 3 detects the unrecorded part by the presence or absence of the regenerative digital signal. A first recording means 4 records the digital signals at least including the tracking pilot signal on the track continuous to the recorded track by the third or fourth head R1 or R2 immediately after the unrecorded part is detected. Further, a second recording means 5 records the tracking pilot signal and the recording data on the track, which is recorded by the first recording means 4, by the first and second heads W1 and W2. Thus, the time up to the start of the consecutive recording is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary head type magnetic recording and reproducing device, and more particularly to a rotary head type magnetic recording and reproducing device that uses a rotary head to record and reproduce digital signals.

[Conventional technology]

2. Description of the Related Art Conventionally, there has been a rotary head type magnetic recording/reproducing device (hereinafter referred to as "FrR-DATJ") that uses a rotary head to record digital signals such as digital audio signals or f-digital data on tracks inclined in the longitudinal direction of a magnetic tape.

In R-DAT-, as shown in Fig. 5(A), the rotating drum 1
0, heads W+, R2, Wz, and R+ are fixed at 90 degree intervals. The rotating drum 10 rotates counterclockwise and the head W1. W2 sequentially records digital signals on tracks inclined with respect to the longitudinal direction of the magnetic tape 11 as shown in FIG. 5(B), and heads R+ and R2 are the heads W+, respectively.

A track recorded at Wz is scanned immediately after recording to reproduce a digital signal, and a verification check of the recorded digital signal is performed.

In addition, track A1. A2. A3 has a head W+.

Recording/reproduction is performed on R+, and track B1. B2. B3 is head W2. Recording and reproduction are performed in R2.

[Problem to be solved by the invention]

After the recording is interrupted at the above R-DAT, the recording may be restarted to record the next digital signal from the track that follows the already recorded track, so-called splicing.

In this case, head R+ up to recorded track A3.83
, R2 and, for example, when head [<1 and the digital signal is no longer reproduced, when recording starts from the subsequent head W2, the part scanned by the head R+ will contain the digital signal and the pilot signal for the servo. is not recorded, and track continuity is lost.

For this reason, conventionally, the head R1 detects an unrecorded area when the digital signal stops being reproduced, rewinds the magnetic tape from there by a predetermined chain, and reproduces it again.
Tracking is performed using TF (automatic track finding), and head W1 scans the track that has already been scanned by head R1 and is now in the unrecorded area.
- Start recording on rack All, and then use head W2 to record 1
~Rack B4 was recorded.

However, it took 1 to get stable tracking with ATF.
Since it takes about seconds, it is necessary to rewind the magnetic tape by that amount, and there is a problem in that it takes a long time to start recording after the instruction to splice is given.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a rotary head type magnetic recording/reproducing device in which the time from when a link instruction is given until the start of recording is short.

[Means to solve the problem]

FIG. 1 shows a diagram of the principle of the device of the present invention.

In the figure, 1 is a rotating drum, and first and second heads W are mounted facing each other at 180 degrees in the circumferential direction.
1. W2 and 1st. The third... Fourth
Head R+.

It has R2.

A magnetic tape spirally wound 90 degrees around the outer circumference of the rotary drum 1 is run, the rotary drum 1 is rotated, and the first. A pilot signal for tracking and a digital signal of recording data are recorded on tracks inclined in the longitudinal direction of the magnetic tape by the second heads Wl and W2, and a third head
．． The fourth heads R+ and R2 are connected to the first. A digital signal is reproduced from the recording track of the second head WW2.

The all-head reproducing means 2 includes first to fourth heads W+, R.
Blind, W2. The recorded tracks are reproduced by all R2.

The unrecorded portion detection means 3 includes first to fourth heads W+,
An unrecorded portion is detected from the presence or absence of the reproduced digital signals of R+, Wz, and R2.

Immediately after the detection means 3 detects the unrecorded portion, the first recording means 4 transmits a digital signal containing at least a pilot signal for tracking to a track that follows the recorded track to the third or fourth head R+, Record with R2.

The second recording means 5 records a tracking pilot signal and recording data on a track that is continuous with the track recorded by the first recording means 4. Second head W1. W2
Record with .

[Effect]

In the device of the present invention, all heads W+.

Play with R+, W2, R2 and play the first. When the reproduction digital signals of the second heads Wl and W2 disappear, an unrecorded area is detected, and immediately after that, the cylinder 3. Fourth head R+, R
2, at least a pilot signal is recorded on a track that follows the already recorded track, and then the first . Second head Wl
, W2 records the recording data. Therefore, there is no need to rewind the magnetic tape after detecting the unrecorded portion, and the time required to start splicing can be shortened.

〔Example〕

FIG. 2 shows an overall configuration diagram of an embodiment of the apparatus of the present invention.

In the figure, 20 is a data processing circuit, which processes digital data coming in from a terminal 21, blocks it, modulates it, and outputs it as a recording digital signal from a terminal 20a. Also, it demodulates and processes the reproduced digital signals coming from the terminals 20b to 20e, performs a verification check between the obtained reproduced digital data and the recorded digital data during recording, and outputs the reproduced digital data from the terminal 22 during reproduction. .

The recording digital signal output from the terminal 20a is amplified by the recording amplifiers 23 and 24, respectively, and then sent to the switch 25.2.
Heads Wl, W fixed to the rotating drum 27 via 6
2 or heads R+ and R2 respectively. Also, heads W+, R+, W2.

The reproduced digital signals reproduced by each R2 are amplified by reproduction amplifiers 30, 31, 32, and 33, respectively, and then sent to the terminal 20.
b, 20c, 20d, and 20e are supplied to the data processing circuit 20 and also supplied to the one-envelope detector 34. Further, the outputs of the reproduction amplifiers 31 and 33 are supplied to a switch, and the reproduction digital signal selected here is supplied to a servo circuit 36.

The servo circuit 36 is supplied with the rotational frequency detection ("G") pulse and rotational phase detection (PG) pulse of a drum motor (not shown) that drives the rotating drum 27 from a terminal 37, and also receives the rotational frequency detection ("G") pulse and the rotational phase detection (PG) pulse of the drum motor (not shown) that drives the rotating drum 27, and also receives the rotational frequency detection ("G") pulse and the rotational phase detection (PG) pulse of the drum motor (not shown) that drives the rotating drum 27. The FG pulse is supplied from the terminal 38.The servo circuit 36 generates a switching signal from the drum PG pulse and switches the switch 3.
5 and the data processing circuit 20, a drum drive signal for rotating the rotating drum 27 at a constant rate is generated from the drum FG pulse and the drum PG pulse, and is supplied from the terminal 39 to the drum motor. Also, under the control of the control processor 41, a capstan drive signal for a capstan motor that rotationally drives the capstan is generated from the capstan FG pulse during recording, and a capstan drive signal for a capstan motor that rotationally drives the capstan is generated from the capstan FG pulse during reproduction, and a reproduction digital signal from the capstan FG pulse and the switch 35 is generated during reproduction. AT of
A capstan drive signal is generated from the F signal to cause the magnetic tape to run so that the heads W+, W2, R+, and R2 can perform accurate tracking, and this capstan drive signal is supplied from the terminal 40 to the capstan motor.

The envelope detector 34 performs envelope detection of the signals supplied from each of the reproduction amplifiers 30 to 33, and outputs an envelope detection signal of, for example, H level when the envelope of the reproduced digital signal is detected, and outputs an L level envelope detection signal when the envelope is not detected. It is generated and supplied to the control processor 41.

The control processor 41 is supplied with a mode instruction signal from a terminal 42 for instructing recording, reproduction, etc.

The control processor 41 controls the recording amplifiers 23 and 24 to operate only in the recording mode and the linking mode, and not in the playback mode, and connects the switches 25 and 26 to the fixed contact W side in the recording mode, so as to operate the recording amplifiers 23 and 24 in the linking mode. control to connect to the fixed contact R side.

FIG. 3 shows a flowchart of the connection process executed by the control processor 41.

When splicing, the magnetic tape is returned to the part where the recorded track exists and the process shown in FIG. 3 is started.

First, as a playback mode, in addition to heads R+ and R2, heads Wl and W2 scan and play back already recorded tracks A1 to 83 as shown in FIG. 5(B).
+, tracking is performed using the ATF signal in the reproduced digital signal from R2 (step 51). This step 51 is carried out from the envelope detection 34 to the control processor 4.
Step 5 as long as the envelope detection signal is supplied to 1.
The process is repeated based on the determination in step 2.

As a result, as shown in the timing chart of Fig. 4,
In the reproduction mode, tracking servo using the ATF signal is performed, and recorded tracks Δ1 to B3 are reproduced.

Here, after the last recorded track B3 is reproduced, the head W+ scans the unrecorded portion, so an envelope detection signal cannot be obtained, and steps 52 to 53 in FIG.
, the ATF pilot signal is recorded on the track Δ4 by the head R1 in a splicing mode. As is well known, there are four patterns of ATF pilot signals, and these patterns are repeated in order on adjacent tracks, and the pilot signal of the pattern following track B3 is recorded on the connected track A4.

Thereafter, the process proceeds to step 54, where the recording mode is entered and the head W2 records a digital signal of recording data including the pilot signal of the ATF on the track B4. Furthermore, head R
2, this track B4 is reproduced, and the reproduced data of this track B4 is used for verification check in the data processing circuit 20 (step 55).

The above steps 54 and 55 are repeated until there is no more recording data due to the determination in step 56, and the process ends.

Note that the reason why only the pilot signal is recorded in step 53 is that verification check is not possible here, and if verification check is deemed unnecessary, the digital signal of the recorded data is recorded from step 53. It doesn't matter.

In this way, in the apparatus of this embodiment, when performing splicing, there is no need to find an unrecorded part of the magnetic tape, then rewind the magnetic tape and play back up to the unrecorded part.
The time required to start recording is short and smooth transitions can be made.

〔Effect of the invention〕

As described above, the rotary head type magnetic recording/reproducing apparatus of the present invention requires only a short time from instructing splicing to starting recording, and is extremely useful in practice.

[Brief explanation of drawings]

FIG. 1 is a principle diagram of the device of the present invention, FIG. 2 is a configuration diagram of an embodiment of the device of the present invention, FIG. 3 is a flowchart of the splicing process, and FIG. 4 is a timing chart for explaining splicing. FIG. 5 is a diagram for explaining the rotating drum and the tracks of the magnetic tape. 1.27...Rotating drum, 2...All head reproducing means, 3...Unrecorded portion detection means, 4...First recording means, 5...Second recording means, 20. ...Data processing circuit, 34...Envelope detector, 36...Servo circuit, 41...Control processor, 51-56...Steps.

Claims (1)

[Scope of Claims] First and second heads mounted facing each other at positions 180 degrees above the circumferential direction of the rotating drum, and facing each other at positions rotated 90 degrees from the first and second heads. A magnetic tape spirally wound around the outer periphery of the rotating drum is run, and the rotating drum is rotated to record the first and second heads. A head records a pilot signal for tracking and a digital signal of recording data on a track inclined in the longitudinal direction of the magnetic tape, and a third and fourth head records data from the recording track of the first and second heads, respectively. In a rotary head type magnetic recording and reproducing device for reproducing digital signals, an all-head reproducing means for reproducing previously recorded tracks by all of the first to fourth heads, and presence or absence of reproduced digital signals of the first to fourth heads. an unrecorded part detecting means for detecting an unrecorded part from the unrecorded part; a first recording means for recording with a third or fourth head; and a pilot signal for tracking and recording data on a track continuous to the track recorded by the first recording means, using the first and second heads. 1. A rotary head type magnetic recording/reproducing device comprising: second recording means for recording.