JPH02156455A - Double deck type video tape recorder - Google Patents

Abstract

PURPOSE:To continuously record an information signal for a long time by recording the information signal with one VTR while rewinding the other out of two VTRs. CONSTITUTION:Plural tracks are provided on a tape 2A by dividing it in the axial direction, whereas the subject recorder is provided with the VTR 50A for recording the information signal on an optional track out of individual tracks of the tape 2A using video heads 1aA and 1bA as the tape is allowed to travel, the VTR 50B of the similar function and a central control unit 64 for controlling the traveling state of the tapes 2A and 2B. Then, upon completion of recording the information signal to one track of the tape 2A in the VTR 50A, the information signal is continuously recorded to one track of the tape 2B in the VTR 50B, and subsequently the tape 2 is rewound in the VTR 50A.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a double-deck video tape recorder (double-deck VTR) suitable for use in recording audio signals continuously for 24 hours at a radio broadcasting station, for example. Regarding.

(Summary of the Invention) The present invention provides a double-deck type VT suitable for use in recording audio signals continuously for 24 hours at a radio broadcasting station, for example.
In R, a first tape of a predetermined length is divided in the width direction to provide a plurality of tracks, and while the first tape is running, a first video head is used to drive the plurality of tracks on the first tape. A first video tape recorder (VT
R), a second tape of a predetermined length is divided in the width direction to provide a plurality of tracks, and while the second tape is running, a second video head is used to record a plurality of tracks on the second tape. A second VTR configured to record an information signal on any one of the tracks, and a central control device that controls running states of the first tape and the second tape. By recording an information signal on the other of the first and second VTRs while rewinding one of the first and second VTRs, the information signal can be recorded continuously for a long time. It is something.

[Conventional technology]

For example, radio broadcasting stations record their broadcast content 24 hours a day (
Newspaper companies must be able to receive electronically transmitted photographs sent via telephone lines in the form of digital signals, etc. from foreign news agencies. There is a desire to develop a device that can continuously record information signals for long periods of time.

To meet these needs, JP-A-58-22
In Japanese Patent No. 2402, a so-called multi-PCM type VTR is proposed, which is capable of recording a recording time that is, for example, six times longer when used for audio than when used for video. FIG. 6 shows a multi-PCM type VTR proposed in Japanese Patent Application Laid-Open No. 58-222402, and in FIG. 6, (la).

(1b) has a video head, and (2) has a winding corner of 21
6° (=36' x 5) magnetic tape, (3) is the rotating shaft of the rotary head drum (5) (see Fig. 7), and (4) is the motor.

In addition, (11) is an input terminal to which the video signal ■ is supplied;
(12) is a low-pass filter that separates the luminance signal, (1
3) is an FM modulation circuit, (14) is an adder that generates a video recording signal SL, (15) is a recording amplifier, (16),
(17a).

(17b) is a switch circuit, (18) is a bandpass filter that separates color signals, and (19) is a low-pass conversion circuit. Further, (10) shows the audio signal recording circuit as a whole, and (21) shows the audio signal Ss in this recording circuit (10).
(22) is a PCM modulation circuit, (23) is a time axis compression circuit that generates the audio recording signal Su, (24) is a recording amplifier, and the magnetic tape (2)
The video signal ■ and the audio signal Ss are sent to the control circuit (3).
0) is selectively modulated and recorded.

Further, (30) shows the control circuit as a whole, in this control circuit (30), (35) is a changeover switch for switching between video and audio use, and (36) is a synchronization separation for taking out the vertical synchronization pulse Pv. circuit, (37) is a switch circuit, (38) is a divide-by-2 circuit, (31) is a Wi
A clock generator that generates a vertical synchronizing pulse Pv in Q terms and a pulse C having a frequency five times that of this pulse Pv
32) is a counter that counts the pulse C, (33) is a decoder, and (34) is a selector.

The winding of the magnetic tape (2) is made by dividing an angle of 216° into 6 equal parts. Each winding consists of 6 tracks of the 1st channel to the 6th channel with an angle of 36°.
4) outputs a signal for recording the PCM-modulated audio recording signal Su to the track of the first channel of the video to the decoder (33); A signal for recording the PCM-modulated audio signal Su on any one unrecorded track is output to the decoder (33). The decoder (33) uses the control signals Qp+Qa and Qb in accordance with the command from the selector (34) to control the PCM modulation circuit (22).
) and the operation of the switch circuits (17a) and (17b).

Further, (41) is a control circuit that generates a reference pulse Pr synchronized with the vertical synchronizing pulse (or a pseudo-generated vertical synchronizing pulse) Pv, (42) is a servo circuit, and (43) is a rotating shaft (3). (44) is a recording amplifier, (45) is a fixed magnetic head, and this servo circuit (42) generates a pair of video heads (la) and (lb). scans the magnetic tape (2) obliquely in synchronization with the vertical synchronization pulse Pv, and the fixed magnetic head (45) scans the magnetic tape (2) diagonally.
) A control signal is recorded on the control track (2C).

When the multi-PCM VTR shown in Fig. 6 is used for video, the magnetic tape (2) is wound on the first channel (lch) track corresponding to an angle of 36° as shown in Fig. 8. The recording signal Su is recorded, and the winding is from the 2nd channel to the 6th channel (2ch to 6th channel) corresponding to the corner 180'.
A video recording signal St is recorded on the track of channel (ch).

In addition, when the multi-PCM type VTR shown in Figure 6 is used for audio, when the magnetic tape (2) is run for the first time, as shown in Figure 9A, the PCM is converted to an Lch track. The time-axis compressed audio recording signal Su is recorded. When the magnetic tape (2) is rewound and run again, as shown in FIG. 9B,
The audio recording signal Su is recorded on the 2ch track. Then, when the magnetic tape (2) is run for the sixth time, the audio recording signal Su is recorded on the 6ch track as shown in FIG. 9C. Therefore, this multi-PCM type VT
According to R, the audio signal Ss can be recorded in six times the normal time.

[Problems to be Solved by the Invention] As described above, according to the 6-channel multi-PCM VTR, only audio signals are recorded using a magnetic tape that is long enough to record, for example, four hours of video signals continuously. Considering this, audio signals can be recorded for 4 hours x 6, ie, 24 hours.

However, in reality, when recording from one channel of the magnetic tape to the next channel,
The magnetic tape had to be rewound to the top of the tape, and long-term recording could only be done intermittently.

In view of the above, an object of the present invention is to propose a VTR capable of continuously recording information signals such as audio signals for a long time.

[Means to solve the problem]

For example, as shown in FIG. 1, the double-deck VTR according to the present invention divides a first tape (2A) of a predetermined length in the width direction to provide a plurality of tracks, and runs the first tape (28). the first video head (1aA) while
(1bA) to record an information signal on any one of the plurality of tracks of the first tape (28); A second tape (2B) is divided in the width direction to provide a plurality of tracks, and while the second tape (2B) is running, the second video heads (1aB) and (1bB) are used to record the second A second VTR (50B) is configured to record an information signal on any one of a plurality of tracks of the second tape (2B), and
8) and a central control device (64) that controls the running state of the second tape (2B), and the first and second V
When one of the VTRs (50A) and (50B) is being rewound, an information signal is recorded on the other VTR.

[Operation] According to the present invention, the first VTR (50A
), when the recording of the information signal on one track of the first tape (2A) is completed, the second V T
In R (50B), an information signal is continuously recorded on one track of the second tape (2B), and at the same time, the first tape (2A) of the first v T R (50A) is recorded.
You can rewind. Therefore, information signals can be recorded continuously for a long time.

[Embodiment] Hereinafter, an embodiment of the double-deck VTR of the present invention will be described with reference to FIGS. 1 to 5. This example describes the present invention.
This is applied to an electrophotographic receiver that can continuously record electromagnetic photographs sent via telephone lines at newspaper companies, etc. for 48 hours. Portions corresponding to the figures are indicated by the same reference numerals with an alphabetical suffix of A or B, and detailed explanation thereof will be omitted.

FIG. 1 shows the electrophotographic receiver of this example, and in FIG. 1, (50A) and (50B) indicate A deck and B deck, respectively, which are composed of a 6-channel multi-PCM type VTR having the same configuration. Its 6-channel multi-PCM type V
The TR is approximately the same as the VTR shown in FIG. 6 except that the control circuit (30) is removed. In the hedetsuki (50A), (I
OA) is an audio signal processing circuit for performing PCM modulation and PCM demodulation of audio signals, (51A) is a tape cassette, (52A) is a supply reel, (53A) is a take-up reel, and (54^) is a capstan. This capstan (54A) is driven by a capstan motor (56^) via a belt (55^).

The audio signal processing circuit (LOA) is supplied with an audio/control signal SQA including audio signals and control signals from a central control unit (64), which will be described later, and the audio signal processing circuit (LOA) is supplied with an audio/control signal SQA including audio signals and control signals.
The audio signal reproduced by the IOA is returned to its central controller (64). Also, (57A) is the reel (5
2A), a belt for driving (53A), (5
8A) shows a reel frequency generator (reel FC) for detecting the rotational speed of the supply reel (52A). As the amount of winding of the magnetic tape (2A) on the supply reel (52A) decreases, the supply reel (52^) begins to rotate at high speed even if the tape speed is constant, so that the reel F C (
By monitoring the output signal of the magnetic tape 58A), it can be determined that the magnetic tape (2A) has approached the tape end, that is, has reached the briend area.

Therefore, the output signal of this reel FC (58A) is called the tape (2A) briend signal PEA.

In addition, (59^) is a light emitting element inserted from the outside into the tape cassette (51A), (60^) and (61A)
indicate a light-receiving element, and the light-receiving element (60A) is connected to a transparent leader tape (2A) provided at the top of the tape (2A).
63A) (corresponding to (63B) of tape (2B)), and the light receiving element (61A) detects a transparent trailer tape (62A) provided at the end of the tape (2A). Therefore, the light receiving elements (60A) and (618) constitute the top sensor and end sensor of the tape (2A), respectively, and the signals generated by the top sensor (60A) and the end sensor (61A) are transmitted to the tape top signal T.
A and tape end signal EA. The end signal PEA, tape top signal TA and tape end signal EA are respectively supplied to a central controller (64).

Furthermore, (68^) is a driver for a capstan motor (56^), and this driver (68A) is controlled by a central control device (64) to be described later.
6A) Capstan on signal CAP for operating
A and a forward/reverse rotation signal F/RA indicating forward/reverse rotation is supplied. And the B deck (50B) also has the A deck (5
0A), and the parts constituting the B deck (50b) and the electrical signals related to the B deck (50B) are the same as the corresponding components of the A deck (50A) and the person deck (50A), respectively. ), and a detailed explanation thereof will be omitted.

In addition, in FIG. 1, (64) is a central control unit (CP
U), (65) is a keyboard, (66) is a printer, and (67) is a telephone line to which the electrophotographic signal P is input. This CPU (64) is the control circuit (3) of the example shown in FIG.
0), and the electrophotographic signal P is regarded as an audio signal and is alternately distributed and recorded on the A deck (50A) and the B deck (50B), and the electromagnetic signal P is recorded based on instructions from the keyboard (65). Tape (2A) and (2B
) is reproduced and supplied to the printer (66). The printer (66) prints an image corresponding to the supplied signal P.

Figure 2 shows the rotary head drum (5A) of this example (the rotary head drum (5B) also has the same configuration). In Figure 2, the magnetic tape (2A) is wound at an angle of 216 degrees. (=36°×6) and its rotating head drum (
5A), and the video heads (1aA) and (1bA) are wound around the rotating head drum (58).
The magnetic tape (2A) is fixed at an angular interval of 216°.The winding is such that each part of the magnetic tape (2A) corresponding to the 36° corner is divided into 6 equal parts as shown in Figure 3. The audio signal tracks are divided in the width direction of the tape from the first channel (lch) to the sixth channel (6ch). For example, the electrophotographic signal P input during the time T required for the video head (1aA) to travel obliquely along the tape (2A) over a length corresponding to the winding angle 180@
After being PCM-modulated, the winding is compressed on the time axis into a signal of time t (=T15) required to travel a length corresponding to 36 degrees, and is transmitted to a 1ch rack by a magnetic head (lb^), for example. recorded in Therefore, each track lc
In channels h to 6, the PCM-modulated and time-axis compressed electrophotographic signals P are sent to the video head (1aA) and (
lb^) are recorded at different azimuth angles alternately.

The magnetic tape (2B) also has the same tape format as the magnetic tape (2A).

The operation of continuously recording the electrophotographic signal P in the electrophotographic receiver of this example will be explained with reference to FIG. ) and (2B) into the A deck (50A) and B deck (50B), respectively, and input the command code for continuous recording mode from the keyboard (65) to CP.
Send to U (64). A CPU that supports this
The operation of the CPU (64) and the operations of the A deck (50A) and the B deck (50B) based on the control signal output from the CPU (64) will be explained in detail for each step shown in FIG.

Step (100): Deck A (50A) and Deck B (50B) wait with tapes (2A) and (2B) rewound, respectively. In this case, the top sensor (60
Tape top signals TA and TB are supplied from A) and (60B) to CPU (64) in an on state, respectively.

Step (101): CPU (64) is built-in R
Assign 1 to the variable N in AM. The value of this variable N indicates the channel number of the track on which the electrophotographic signal P is recorded on the tapes (2A) and (2B).

Step (102): The electrophotographic signal P is recorded on the Nth channel track of the magnetic tape (28) in the A deck (50A). Since N=1 is set immediately after recording starts, recording is performed from the first channel (Ich).

Step (103): Check whether the signal EB output from the end sensor (61B) of the B deck (50B) is on or not, that is, the magnetic tape (2B) of the B deck (50B) is in the tape end state. Find out whether or not. This step (103) is meaningless immediately after starting recording. However, as will be described later, when switching the recording of the electrophotographic signal P from the B deck (50B) to the A deck (50A), an overlap recording time of several minutes is provided.
The magnetic tape (2B) of 0B) reaches the tape end state several minutes after the start of recording on deck A (50A).

If the tape is at the end, proceed to step (104);
If not, the process moves to step (105).

STEP (104): Checks whether the briend signal PEA output from the reel FC (58A) of the A deck (508) is in the ON state, that is, the A deck (508).
It is checked whether the magnetic tape (28) of 0A) is in a brind state. If in Briend state, step (10
Proceed to step 8), and if the bridle state has not yet been reached, return to step (102).

Steps (105) to (107): B deck (50
This is the operation when the magnetic tape (2B) in B) is in the tape end state, and the B deck (50B) is connected to the CPU (6
Recording is stopped by the control signal of 4) and the magnetic tape (
2B) at high speed (requires about 5 minutes), the tape top signal TB output from the top sensor (60B) is on standby. After this, CPU (64)
The operation moves to step (104).

Step (108): The CPU (64) records the electrophotographic signal P on the Nth channel track of the magnetic tape (2B) of the B deck (50B). Immediately after the start of recording, the electrophotographic signal P is also recorded redundantly on the Nth channel track of the magnetic tape (2A) on the A deck (50A), so the time indicated by diagonal lines in FIG.
) is the overlap recording time.

Step (109): Check whether the magnetic tape (2A) of the A de-link (508) is in the tape end state, and if it is in the tape end state, proceed to step (111).
If not, the process goes to step (110).

Step (110): After checking whether the B deck (50B) is in the Briend state, if it is in the Briend state, proceed to Step (114), and if it has not yet reached the Briend state, return to Step (108). .

Steps (111) to (113): A deck (50A)
This is the operation when the magnetic tape (2B) is at the tape end state, and the A deck (50A) stops recording and rewinds the magnetic tape (28) at high speed according to the control signal from the CPU (64). After that, the magnetic tape (2A) is put on standby with the tape top. After this, the CPU
The operation in (64) moves to step (110).

Step (114): This is an operation when the B deck (50B) is in the Briend state, and the CPU (64) adds 1 to the value of the variable N in the built-in RAM.

Step (115): The CPU (64) determines whether the value of the variable N has reached 7, that is, whether the signal P has been recorded on all six tracks of the tapes (2A) and (2B). Find out. If the value of N reaches 7, proceed to step (116); if it has not yet reached 7, return to step (102) 0 For example, step (115)
When the value of N is 2 in CPU U (64
) returns to step (102), and as shown in FIG.
Recording of the electrophotographic signal P on the channel is started. At this time, as shown in FIG. 5B, the magnetic tape (2B) on the B deck (50B) has an overlap recording time (
69B), the signal P is recorded redundantly.

Step (116): Magnetic tape (2A) and (2B)
This is a step when all the signals P are recorded on each of the six tracks of the magnetic tape (2B) and the magnetic tape (2B) is in a Briend state. Generates a tape end alarm such as a flashing light. In response to this, the operator first replaces the tape cassette (51A) with the next unused cassette,
By replacing the tape force setting (51B) with another unused cassette after recording has begun on this unused cassette, the electrophotographic signal P can be continuously transmitted virtually indefinitely.
There is a profit that can be recorded.

As described above, according to the electrophotographic receiver of this embodiment, the electrophotographic signal P is continuously PCM-modulated and compressed on the time axis, and then transferred from the first track of the magnetic tape (2A) to the magnetic tape (2B). The data is sequentially recorded on the first track → the second track of the magnetic tape (2^) → the sixth track of the magnetic tape (2A) → the sixth track of the magnetic tape (2B). And 1 of each of the magnetic tapes (2^) and (2B)
Since the signal P can be recorded continuously for about 4 hours on the track for each channel, 4x6x2=48 (hours), so in this example, the electrophotographic signal P can be recorded continuously for about 48 hours as shown in Figure 5C. There are profits that can be recorded.

In addition, in this example, the A deck (50A) and the B deck (50B) are provided with reels F G (58A) and (58B) that detect the rotation speed of the supply reel shaft, respectively, and the magnetic tape (2A) and If one of (2B) reaches a briend state, it can be detected. Therefore, by recording the signal P redundantly on the other magnetic tape, the overlap recording time is (69A) and (69B).
is ensured, so when the recording of the electrophotographic signal P is switched from magnetic tape (2A) to magnetic tape (2B), the signal P
There is an advantage in that the records are not temporarily lost.

In addition, when printing an electrophotograph using the electrophotographic receiver of this example, the operator places the tape cassette in which the signal P in the desired time range is recorded on deck A (50A) or deck B.
After loading the deck (50B), a corresponding command is sent from the keyboard (65) to the CPU (64).

In response to this command, the CPU (64) sets the A deck (50A) or B deck (50B) in which the tape cassette is loaded to the playback mode, and sends the played back electrophotographic signal P to the printer (66). Send.

According to this example, 48 hours worth of electrotransmitted photographic signals P are continuously recorded on two tape cassettes, which is convenient for organization, and has the advantage of being able to print out electrotransmitted photographs with a good S/N ratio at any time. be.

In this case, a time code (year: month: day: hour: minute: second) may be recorded together with the signal P. When a time code is recorded, there is an advantage that a desired signal can be quickly located.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that changes can be made without departing from the gist of the present invention. For example, the present invention can be used for 24-hour audio monitoring at broadcasting stations, etc., and can also be used for A deck (50A) and B deck (50A).
50B) may be a VTR that does not have a function to PCM-modulate and record a normal audio signal, or may record video signals other than audio signals.

〔Effect of the invention〕

The double-deck VTR of the present invention is constructed as described above,
Since the information signal is recorded on the other VTR while rewinding one of the first and second VTRs, there is an advantage that the information signal can be continuously recorded for a long time.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an electrophotographic receiver as an embodiment of the present invention, FIG. 2 is a diagram showing the structure near the rotating head drum of the VTR in the example shown in FIG. 1, and FIG. FIG. 1 is a diagram showing the tape format of the magnetic tape in the example; FIG. 4 is a flowchart showing the operation of the example in FIG. 1; FIG. 5 is a diagram explaining the operation of the example in FIG. 1; FIG. is the conventional multi-P
FIGS. 7 to 9 are diagrams showing the configuration of a CM type VTR, and are diagrams for explaining the example shown in FIG. (1aA), (1bA), (1aB), (
1bB) are video heads, (2A) and (2B) respectively.
are respectively magnetic tapes, (50A) is A deck, (50B)
are B decks, (59A) and (59B) are light emitting elements, (60A) and (60B) are light receiving elements (top sensors), (614) and (61B) are light receiving elements (end sensors), respectively. ) and (58B) are reel frequency generators (reel FC), respectively, and (64) is a central control unit (CPU). 7. Rotation of the 1st column for Godo, 8th figure, t.

Claims (1)

[Claims] A first tape of a predetermined length is divided in the width direction to provide a plurality of tracks, and while the first tape is running, a first video head is used to record the first tape. a first video tape recorder configured to record an information signal on any one of the plurality of tracks; a second tape having a predetermined length divided into a plurality of tracks in the width direction; a second video tape recorder configured to record an information signal on any one of the plurality of tracks of the second tape using a second video head while running the second tape; a central control unit that controls running states of the first tape and the second tape, and when one of the first and second video tape recorders is rewinding, the other video tape recorder receives information. A double-deck video tape recorder characterized by recording signals.