JP3051658B2 - 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 capable of recording for a long time by skipping frames captured by a surveillance camera or the like.

[0002]

2. Description of the Related Art A monitoring magnetic recording / reproducing apparatus called a time-lapse video tape recorder intermittently runs (or runs at a low speed) a magnetic tape to transmit a video signal at a predetermined time interval (one field interval in (2n + 1) fields; (Integer) to record the video track width equivalent to the VHS standard mode, that is, to perform intermittent frame skip recording (or low-speed running frame skip recording) to enable long-time recording, and perform VHS mode (standard mode) recording. ) And playback compatibility.

[0003] In the case of intermittent running, the tape speed during running is ideally the same as the tape speed in the standard mode. Double the speed. In the case of low-speed running (continuous running), the tape speed during running is 1 / (2n + 1) of the tape speed in the standard mode. Also in the case of low-speed running frame-less recording, recording is performed in an amount equivalent to the video track width in the standard mode of the VHS system, as in the case of intermittent frame-free recording.

In addition, the video signal is driven at low speed, and the video signal is divided into three fields at intervals of one field.
Frame skip recording on video track width of ３ or 、,
That is, low-speed running frame skip recording is performed (for example, JP-A-6-197300). In the case of this low-speed running frame-out recording, the tape speed of the magnetic tape is 1/9 or 1/12 of the tape speed in the VHS standard mode.

Hereinafter, a conventional magnetic recording / reproducing apparatus will be described.
This will be described with reference to the drawings. FIG. 3 is a timing chart of intermittent frameless recording of a conventional magnetic recording and reproducing apparatus.
This is the recording timing when performing long-time recording equivalent to 50 hours (48-hour mode) using a 2-hour tape in the HS standard mode. In FIG. 3, 31 is a video signal, 3
2 is a recording control signal, and 33 is a recording track pattern of the magnetic tape.

In the time mode of the conventional magnetic recording / reproducing apparatus, the video signal 31 is recorded by intermittently running the magnetic tape 33 at intervals of one field every 25 fields. That is, by recording a video signal of one field (recording without intermittent frames) in the D corresponding to the video track width in the VHS standard mode at an interval of one field in 25 fields (the predetermined time interval n = 12). Time recording was enabled. Also in the case of intermittent running in this conventional example, the tape speed during running is about 0.6 times the tape speed in the standard mode.

[0007]

However, in the above-mentioned conventional magnetic recording / reproducing apparatus, since the video signal of one field is frame-separated and recorded in the D corresponding to the video track width in the VHS standard mode, for example, Like V
When performing long-time recording equivalent to 50 hours using a 2-hour tape in the HS standard mode, the predetermined time interval n = 1
As 2, the frame skip recording of one field is performed in 25 fields. However, frame skip recording of one field in 25 fields is performed in the case of the NTSC signal of this example.
One field is recorded in about 0.42 seconds (25/60 seconds). In particular, in the case of monitoring to record on one time-lapse video tape recorder while sequentially switching a plurality of cameras, it takes time for the cameras to make a round. There was a problem. For example, even if it is equivalent to 26 hours (24 hour mode), one frame is recorded in 13 fields and one field is recorded in about 0.22 seconds (13/60 seconds), which is a similar problem. Was.

On the other hand, the video signal is recorded at frame intervals of about 1/3 or about 1/4 of the standard mode of the VHS system at intervals of 1 field by moving the video signal at low speed by running at low speed (for example, see Japanese Patent Application Laid-Open No. Hei 6-197300). Publication), about 1 video track of the VHS standard mode video track is used.
The number of fields that can be recorded on one tape increases due to low-speed running frame-less recording of one field every ３ or about ４ width, but about 18 hours even when a VHS standard mode 2-hour tape is used. Or the problem that only long time recording up to about 24 hours is possible
There is a problem that reproduction compatibility with S (3x mode) cannot be maintained, and that there is a limit to a long time in low-speed running.

Furthermore, the predetermined time interval for frame skipping is set to (2n +
Otherwise, the playback compatibility with the VHS system cannot be maintained. That is, there is a problem that the reproduction compatibility with the VHS method cannot be maintained unless the recording time is odd (2n + 1) times as long as the recording time when the frame-less recording is not performed.
The present invention solves the above-mentioned problem, and enables long-time recording even if the number of frame skips is reduced, and furthermore, an integral multiple m of the recording time of the VHS method (triple mode) when frame skip recording is not performed. It is an object of the present invention to provide a magnetic recording / reproducing apparatus capable of performing long-time recording (3 ≦ m) without time limit and maintaining reproduction compatibility with a VHS system (triple mode).

[0010]

Magnetic recording and reproducing apparatus according to claim 1, wherein Means for Solving the Problems], the calibration for intermittently travel about one-third of the video track width of the magnetic tape in the standard mode of the VHS system
And comparing the data unit to be to store the data corresponding to Pusutan rotation amount, and the capstan rotation detection means for detecting the rotation of the capstan, a capstan comparison data unit and the rotation information of the capstan from the capstan rotation detection means Times
Comparing means for comparing data corresponding to the amount of transfer , and about one mode of the VHS standard mode based on comparison information from the comparing means.
Capstor stored in the comparison data section so that the magnetic tape runs intermittently from the stationary state by the video track width of.
Run the magnetic tape while driving the capstan by the amount of rotation
A mechanism control means for generating a recording control signal for one field during a line, a video input unit for inputting a video signal from the outside, and a video control signal sent from the mechanism control means for displaying an image on the magnetic tape during running of the magnetic tape Recording / reproduction control means for recording a one-field video signal from the input unit, and frame skipping control means for controlling a time interval for intermittently running the magnetic tape from a stationary state by giving a command to the mechanism control means. . The frame skipping control means controls the intermittent running of the one-field magnetic tape in the (2n + 1) fields (n is an integer) of the video signal from the video input unit.

According to a second aspect of the present invention, there is provided a magnetic recording / reproducing apparatus having a VH
The capstan rotation amount for intermittently running the magnetic tape by about 1/3 of the video track width of the standard mode of S system
A comparison data section for storing corresponding data, capstan rotation detecting means for detecting rotation of the capstan, capstan rotation information from the capstan rotation detecting means and a capstan rotation amount of the comparison data section A comparison means for comparing data, and a comparison data portion for intermittently running the magnetic tape from a stationary state by a video track width of about 1/3 of the VHS standard mode based on comparison information from the comparison means. Mechanism control means for generating a recording control signal for one field while the magnetic tape is running while driving the capstan by the capstan rotation amount stored in the
A video input unit for inputting a video signal from outside, and a magnetic tape according to a recording control signal sent from the mechanism control means.
Recording / reproduction control means for recording a one-field video signal from a video input unit on a magnetic tape while the magnetic tape is running; And a cutting control means. The frame skipping control means intermittently runs the one-field magnetic tape in the (2n + 1) field (n is an integer) of the video signal from the video input unit,
+3) The control is performed so that the one-field magnetic tape is intermittently run in the field.

According to the magnetic recording / reproducing apparatus of each of the above-mentioned claims, the magnetic tape runs while the magnetic tape runs intermittently by about 1/3 of the video track width of the VHS standard mode.
By performing frame-by-frame recording of a video signal of one field in a row over a video track width of about 1/3 of the VHS standard mode of the magnetic tape, the magnetic tape is intermittently moved by the VHS standard mode video track width. Magnetic while running
As compared with the case where the video signal of one field is recorded for the width of the video track of the standard mode of the VHS system on the magnetic tape while the tape is running, the recording can be performed for a long time with a reduced number of frame skips. In addition, it is possible to obtain reproduction compatibility with the VHS method (triple mode).

Further, the interval at which the magnetic tape is intermittently driven from the stationary state is set to one field in the (2n + 1) field, or the state of one field in the (2n + 1) field and the state of one field in the (2n + 3) field. Since frame skip recording is performed while repeating alternately,
An integral multiple m of the recording time when frame-less recording is not performed while maintaining reproduction compatibility with the VHS method (3x mode) (3 ≦
m) long-term recording can be performed without time limit.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a magnetic recording / reproducing apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 9 denotes a magnetic tape driven by a capstan 5, which is a recording medium of this embodiment. Reference numeral 1 denotes a comparison data section which stores data a corresponding to the rotation amount of a capstan for intermittently running the magnetic tape 9 for a video track width of about 1/3 of the VHS standard mode. Numeral 2 denotes a comparing means for comparing the rotation information b of the capstan 5 from the capstan rotation detecting means 3 for detecting the rotation of the capstan 5 with the data a of the comparison data section 1 described above.

[0015] 4 is the mechanism control unit, compared to intermittently travel about one-third of the video track width of only the still state of the standard mode of comparison information VHS system magnetic tape 9 based on c from the comparator 2 Stored in the data section 1
While driving the capstan 5 by the amount of capstan rotation
While the magnetic tape is running, a recording control signal d is sent to the one-field recording / reproduction control means 6. The recording / reproduction control means 6 records the video signal e from the video input unit 8 on the magnetic tape 9 for one field while the magnetic tape is running in response to the recording control signal d from the mechanism control means 4.

Reference numeral 7 denotes a frame separation interval control means for controlling a repetition interval for intermittently running the magnetic tape 9 from a stationary state, and (2n +) of the video signal e from the video input section 8.
1) Intermittent running for one field for each field, or one field for (2n + 1) and (2n +
3) Control is performed so that one field (n is an integer) intermittently travels in the field.

FIG. 2 is a timing chart of intermittent frame skip recording when n = 4 when the frame skip interval control means 7 of the magnetic recording / reproducing apparatus of FIG. 1 controls intermittent running of one field in (2n + 1) fields. FIG. 3 shows timings of the video signal e and the recording control signal d in FIG. f is a recording track pattern of the magnetic tape 9, and D is equivalent to a video track width in the VHS standard mode.

That is, FIG. 2 shows the VHS of the NTSC system.
This is a recording timing when a long time recording equivalent to 54 hours (approximately 9 times as long as 6 hours) is performed using a standard mode 2-hour tape (that is, a 6-hour tape in the 3 × mode). The operation of the magnetic recording / reproducing apparatus according to this embodiment configured as described above will be described with reference to FIGS.

First, the comparison data portion 1 has a video track width (about D / D) of about 1/3 of the VHS standard mode.
The data a of the rotation amount of the capstan 5 for the intermittent running of the magnetic tape 9 in 3) is stored in advance. Next, when the magnetic tape 9 starts intermittently running from the stationary state during recording, the comparing means 2 detects the rotation of the capstan 5 from the capstan rotation detecting means 3 to detect the rotation of the capstan 5.
Is compared with the data a of the comparison data section 1 described above.

[0020] Then, the mechanism control unit 4, compares to intermittently travel approximately 1/3 of the magnetic tape 9 of the video track width of the standard mode of the VHS system based on the comparison information c from the comparison means 2 from rest Stored in the data section 1
While driving the capstan 5 by the amount of capstan rotation
While the magnetic tape is running, a recording control signal d is sent to the recording / reproducing control means 6 for one field period. In the above-mentioned intermittent running, the tape speed during running, in order to ensure the stationary accuracy,
The tape speed is set lower than the tape speed in the triple mode of the VHS system. Therefore, one field of video can be recorded on a video track width of about 1/3 of the standard mode. That is, one field of video is recorded while the magnetic tape is running.

The recording / reproduction control means 6 records a video signal for one field from the video input unit 8 on the magnetic tape 9 in accordance with a recording control signal d from the mechanism control means 4. That is, a video signal for one field from the video input unit 8 is recorded in a video track width (about D / 3) of about 1/3 of the VHS standard mode. Then, the magnetic tape 9 is again in a stationary state. In other words, at the time of recording, the state repeats from the stationary state to the intermittent traveling state to the stationary state, and the peak speed during the intermittent traveling is lower than 1/3 of the standard mode of the VHS system. During this time, one field of video is recorded. The amount of tape advanced by one run is equal to one-third of the video track width in the VHS standard mode.

The frame skipping interval control means 7 controls the interval at which the above-mentioned magnetic tape 9 starts intermittent running from a stationary state by giving a command to the mechanism control means 4, for example, a video signal e from the video input unit 8. Is controlled so that one field is intermittently driven in the nine fields. In this way, the VHS standard mode 2 hour tape (ie,
Using a 6-hour tape in the 3x mode, it is possible to record for as long as 54 hours (about 9 times 6 hours).

Similarly, the frame separation interval control means 7 sets n
= 1,2,3,5,6, ..., about 3 times 6 hours,
Long time recording of about 5 times, about 7 times, about 11 times, about 13 times, ..., that is, about 18 hours, about 30 hours, about 42 hours,
For about 66 hours, about 78 hours,... This does not extend the recording time by reducing the tape speed, but extends the recording time by intermittent running, so that there is no limitation on the recording time.

Further, the frame separation interval control means 7 changes the state of one field in the (2n + 1) field and the state of one field (n is an integer) in the (2n + 1) field of the video signal e from the video input section 8. When control is performed so that intermittent running is repeated alternately, n = 1, 2, 3, 4,
5, 6, ..., about 4 times, about 6 times, about 8 times 6 hours
, About 10 times, about 12 times, about 14 times, ... long time recording,
That is, about 24 hours, about 36 hours, about 48 hours, about 6 hours
Long time recording of 0 hours, about 72 hours, about 86 hours,... Can be performed without time limit.

As described above, according to the magnetic recording / reproducing apparatus of this embodiment, the magnetic tape 8 is intermittently run for a video track width of about 1/3 of the VHS standard mode.
By performing frame-by-frame recording of a video signal of one field on the magnetic tape 8 for about one third of the video track width of the VHS standard mode while the magnetic tape is running, the video signal width of the VHS standard mode video track is recorded . The number of skipping frames is smaller than that in which the video signal of one field is skipped and recorded for the video track width of the VHS standard mode of the magnetic tape 8 while the magnetic tape 8 is running while the magnetic tape 8 is running intermittently. This makes it possible to perform long-term recording, and to obtain reproduction compatibility with the VHS method (triple mode).

Further, the interval at which the magnetic tape 8 intermittently runs from the stationary state is set to one field in the (2n + 1) field, or one field in the (2n + 1) field and one field in the (2n + 3) field. Are alternately repeated, so that the recording time is an integral multiple of m when the frame-less recording is not performed while maintaining the reproduction compatibility with the VHS method (3x mode).
(3 ≦ m) long-time recording can be performed without time limit.

Although the present invention describes the VHS system, the same goes for the S-VHS system. Further, in the above embodiment, the NTSC system is used as the television system, but a television system such as the PAL system or the SECAM system may be used. Also, it is natural that the same effect can be obtained in the S-VHS system.

[0028]

According to the magnetic recording / reproducing apparatus of the present invention,
While the magnetic tape is intermittently running for a video track width of about 1/3 of the VHS standard mode, a one-field video signal during the running of the magnetic tape is about 1/3 of the video track of the VHS standard mode of the magnetic tape. by performing the frame vent recorded width of a magnetic tape while intermittently run standard mode video track width of the magnetic tape of the VHS system
As compared with the case where the video signal of one field is recorded for the video track width of the VHS standard mode of the magnetic tape during the running of the loop, the recording can be performed for a long time with a reduced number of frame skips. In addition, it is possible to obtain reproduction compatibility with the VHS method (triple mode).

Further, the interval at which the magnetic tape is intermittently moved from the stationary state is set to one field in the (2n + 1) field, or one field state in the (2n + 1) field and one field state in the (2n + 3) field. Since frame skip recording is performed while repeating alternately,
An integral multiple m of the recording time when frame-less recording is not performed while maintaining reproduction compatibility with the VHS method (3x mode) (3 ≦
m) long-term recording can be performed without time limit.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a magnetic recording and reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a recording timing chart showing an operation of the magnetic recording / reproducing apparatus of FIG.

FIG. 3 is a recording timing chart showing an operation of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Comparison data part 2 Comparison means 3 Capstan rotation detection means 4 Mechanism control means 5 Capstan 6 Recording / reproduction means 7 Frame skipping interval control means 8 Video input section

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/783 H04N 5/91-5/937 G11B 5/027 501

Claims (2)

(57) [Claims] 1. A key for intermittently running a magnetic tape for a video track width of about 1/3 of a VHS standard mode.
A comparison data section for storing data corresponding to the capstan rotation amount ; capstan rotation detection means for detecting rotation of the capstan; rotation information of the capstan from the capstan rotation detection means and the comparison data section of
Comparing means for comparing data corresponding to the capstan rotation amount, and intermittently running the magnetic tape from a stationary state by a video track width of about 1/3 of the VHS standard mode based on the comparison information from the comparing means. The comparison data
Mechanism control means for generating a recording control signal for one field while the magnetic tape is running while driving the capstan by the capstan rotation amount stored in the data storage section, and a video input section for inputting an external video signal When the by the recording control signal sent from the mechanism control unit
The recording / reproduction control means for recording a one-field video signal from the video input unit on the magnetic tape while the magnetic tape is running, and intermittently running the magnetic tape from a stationary state by giving a command to the mechanism control means. Frame removing control means for controlling a time interval, wherein the frame removing control means intermittently runs the magnetic tape by one field in a (2n + 1) field (n is an integer) of a video signal from the video input unit. A magnetic recording / reproducing apparatus characterized by being controlled. 2. A key for intermittently running a magnetic tape by a video track width of about 1/3 of the VHS standard mode.
A comparison data section for storing data corresponding to the capstan rotation amount ; capstan rotation detection means for detecting rotation of the capstan; rotation information of the capstan from the capstan rotation detection means and the comparison data section of
Comparing means for comparing data corresponding to the capstan rotation amount, and intermittently running the magnetic tape from a stationary state by a video track width of about 1/3 of the VHS standard mode based on the comparison information from the comparing means. The comparison data
Mechanism control means for generating a recording control signal for one field while the magnetic tape is running while driving the capstan by the amount of capstan rotation stored in the data storage section, and a video input section for inputting an external video signal When the by the recording control signal sent from the mechanism control unit
The recording / reproduction control means for recording a one-field video signal from the video input unit on the magnetic tape while the magnetic tape is running, and intermittently running the magnetic tape from a stationary state by giving a command to the mechanism control means. A frame skip control means for controlling a time interval, wherein the frame skip control means intermittently runs the magnetic tape by one field in a (2n + 1) field (n is an integer) of a video signal from the video input unit. (2n + 3)
A magnetic recording / reproducing apparatus wherein the magnetic tape is controlled so as to alternately repeat the state in which the magnetic tape runs intermittently in one field.