JPH04326269A - Rotary head type recorder - Google Patents

Abstract

PURPOSE:To provide recording reduced in the degradation of picture quality by stabilizing the travel of a tape regardless of recording condition in the case of the recording. CONSTITUTION:When interval recording is stopped, a tape 2 is rewound for a prescribed amount (longer than a normal consecutive shooting case) by an S reel motor 9 and after the lapse of interval set time, a capstan motor 15 is rotated by a system controller 20. Then, tracking is executed for prescribed time (for a run-up block corresponding to the above-mentioned prescribed amount) and in the case of starting the recording, the travel of the tape is stabilized.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention is applicable to, for example, an 8 mm type V
The present invention relates to a rotary head type recording device that records signals using a helical scan method such as TR.

0002

[Prior Art] For example, a camera-integrated VTR,
In a device that records several scenes on one magnetic tape, it is desirable to be able to reproduce the scenes seamlessly and continuously. For this reason, the 8mm system and VH
S-type VTRs use a flying erase (rotary erase) head to erase recorded tracks frame by frame, and record new signals continuously on the recorded pattern to prevent noise from appearing during playback. This allows for smooth continuous shooting. The operation at this time will be explained below.

FIG. 5(A) shows an 8mm type VTR.
This figure shows an example of the tape path. 1 is a rotating drum unit, 2 is a tape, 3 is a capstan, and 4 is a pinch roller. During signal reproduction and recording, the tape 2 is fed at a constant speed by the capstan 3 and the pinch roller 4 in the direction of the arrow in FIG. 5(A). At this time tape 2
As shown in Fig. 5(B), a downward restraining force is applied to the drum unit 1 due to the fall of the drum entrance/exit guide post, etc., so that the drum unit 1 runs stably along the lead 1a provided on the drum unit 1. However, in order to run tape 2 stably, in addition to servo factors, drum rotation,
Stable capstan rotation, stable coordinates between the tape and tape guide, and stable tape tension are important.

[0004] During splicing, when a pause (PAUSE) command is issued during recording as shown in Fig. 6, the tape 2 is automatically rewound a predetermined amount at the same time as recording stops, and then stopped and stands by (Fig. 6). (Middle A indicates the standby position on the tape)
. After that, when you press the shooting button, tape 2 starts, but
Before actually starting to record a new signal on the tape, the recorded signal is played back for a certain period (between AB in the figure) as a run-up section, and tracking is performed on the recorded signal during playback of this run-up section. After matching, signal recording is started (B in the figure indicates the recording start point). The starting point of this recording is
Normally, this is several frames before the end point of the previous recording (PAUSE in the figure), and the previous recording is erased and rewritten with a new signal, but by performing such an operation,
During playback, you can get smooth images without noise.

In this continuous shooting operation, the standby position A
The amount of rewinding up to this point is usually set to a certain predetermined amount, and this amount is kept short in consideration of responsiveness during continuous shooting (quick shooting performance) and power consumption.

[0006]

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, even when recording is performed that requires emphasis on quick-shooting performance as described above, the section from the recording start point B to the standby position A, that is, the rewinding Since the amounts were the same, there were drawbacks as described below.

As mentioned above, recording is started after tracking in the run-up section AB, but at this time, if the run-up section AB is short, sufficient time has not elapsed since the tape was started. Therefore, the tape tension is not stabilized at a normal value due to the effects of rewinding, and the tape running is not stable enough. Therefore, recording start point B
Nearby, recording pattern 2 of tape 2 is recorded as shown in FIG.
A becomes irregular, and skew and jitter worsen. In normal shooting, one scene is long to a certain extent, and the image quality deteriorates in the spliced portions, which is not noticeable, but when interval recording is performed, the reproduced image becomes unsightly because there are frequently spliced portions.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a rotary head type recording device that solves the above-mentioned problems.

[0009]

[Means for Solving the Problems] In order to achieve the above objects, the present invention provides a rotary head type recording device including a rewinding means for rewinding a tape by a predetermined amount when recording is stopped, and a rewinding means for rewinding a tape by a predetermined amount when recording is stopped, and a rewinding means for rewinding a tape by a predetermined amount when recording is stopped. The present invention is characterized by comprising a setting means for setting a tape run-up section until the start of recording, and a changing means for changing the amount of rewinding by the rewinding means.

0010

[Operation] According to the present invention, when recording is stopped in a recording mode such as interval recording where the recording period is short and operation response is not a problem, the tape is rewound for a longer time than when recording is stopped under normal operation. By setting a long run-up period before the start of recording, tape running at the start of recording is stabilized and interval recording with less deterioration in image quality is realized.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the main parts of a video camera integrated VTR as a rotary head type recording device according to the present invention. Here, 5 is a CCD as an image pickup device provided at the focal point of the lens, 6 is a video signal processing circuit that processes the signal from the CCD 5 into a form suitable for recording, and 7
is a microphone, 8 is an audio signal processing circuit that processes the signal from microphone 7 to make it suitable for recording, and 9 is a supply (S
) Reel motor; 10 is a drive circuit for the S reel motor 9; 11 is a head amplifier that amplifies the reproduction signal from the rotating drum unit (recording/reproducing head) 1 or the recording signal given to the unit 1; 12 is the rotating drum unit. 11 is a rotating drum motor, 13 is a drum motor 1
14 is a servo circuit that controls the drive circuit 13 to stabilize the rotation of the drum motor 12 based on the rotational frequency detection signal (FG) and rotational phase detection signal (PG) from the drum motor 12; 15 is a servo circuit that stabilizes the rotation of the drum motor 12; 16 is a drive circuit for the capstan motor 15; 17 is a drive circuit 1 based on the FG from the capstan motor 15;
6 is a servo circuit that controls the rotation of the capstan motor 15, 18 is a take-up (T) reel motor, and 19 is a drive circuit for the T reel motor 18.

Reference numeral 20 denotes a system controller consisting of a microcomputer and its peripheral circuits, and includes the above-mentioned components 6, 8, 10, 11, 13, 14, 16, 17, 1.
9 is controlled based on operation information from the operation unit 21. The operation unit 21 includes a recording switch (RECSW) 22, a pause switch (PAUSESW) 23, and an interval recording setting switch 24, and inputs operation information from each switch to the system controller 20. In addition,
The operation section 21 also has various operation switches, such as tape rewind and fast forward, which are included in a normal video camera integrated VTR.

FIG. 2 shows a state in which recording is stopped in normal continuous recording by operating only the recording switch 22, and in an interval recording mode in which recording for 5 seconds and waiting for 60 seconds (interval) is repeated using the interval recording setting switch 24. This figure shows how the tape moves. As shown in the figure, in the interval recording mode, the amount of rewind from the pause position is increased compared to normal continuous shooting, and the standby position A' where the rewind is a predetermined amount from the pause position and the recording start point B when restarting recording. Run-up section A'B between '
' is set longer than the run-up section AB in normal continuous shooting recording. This makes it possible to stabilize the tape running when restarting recording, and to perform interval recording with less deterioration in image quality.

FIG. 3(A) is a flowchart showing the control operation by the system controller 20 during normal continuous shooting recording, and FIG. 3(B) is a flowchart showing the control operation by the system controller 20 in the interval recording mode.

First, during normal continuous shooting, as shown in (A), the recording switch starts by turning on, recording is performed on the tape (S1), and recording continues until the pause switch is turned on (S2). , when the pause switch is turned on,
Stop the capstan motor to stop recording on the tape (S3), then reverse the capstan motor (rewind speed is Rn), rotate the S reel motor, and set the FG of the capstan motor to Nn. Count up to (S4
), after counting Nn, stop the capstan motor (
S5), wait until the recording switch is turned on (S6),
When the recording switch is turned on, the rotation of the capstan motor is started (S7), ΔTn time tracking is performed (S8), and the process returns to S1. ΔTn corresponds to the run-up section AB in the normal continuous shooting shown in FIG.

On the other hand, the interval recording mode is (B)
As shown in Figure 2, starting with the setting using the interval setting switch, only the set time TREC set using the interval setting switch is recorded on the tape (
S11, S12) After the set time TREC has elapsed, the capstan motor is stopped and recording on the tape is stopped (S11, S12).
13) Then, reverse the capstan motor (rewinding speed is Rint. Rn>Rint), rotate the S reel motor, and set the FG of the capstan motor to Nint (Ni
nt>Nn) (S14). As a result, the tape is rewound for a longer period of time than during normal splicing. After counting Nint, the capstan motor is stopped (S15), and after the set time Tint set by the interval setting switch has elapsed (S16),
Start the rotation of the capstan motor (S17)
, △Tint time tracking is performed (S18),
Return to S11. ΔTint corresponds to the run-up section A'B' in the interval recording in FIG.

(Other Embodiments) In the above embodiments,
Although the tape rewind amount is controlled only depending on the mode, the tape rewind amount and the run-up section can also be changed depending on the length of the immediately preceding recording time. In other words, instead of lengthening the run-up section only when the interval recording mode is set as described above, the run-up section is automatically lengthened when the previous shooting time is extremely short and the situation is judged to be close to interval recording. settings to ensure stable recording. FIG. 4 shows the operation of the system controller 20 for realizing such an example of operation.

First, at the same time as recording stops (ends), the recording time is calculated and set as T (S21). For this calculation, for example, the FG of the capstan motor may be counted. Next, in S22, if this T is short enough to be equivalent to interval recording and shorter than the predetermined recording time Ts, which is considered to be better for driving stability, in S23, an approach section that is longer than that for normal continuous shooting is set. , S24
Performs rewinding operation and ends (standby). On the other hand, S2
If T>Ts in step 2, a short normal run-up period is set in step S25, and the process proceeds to step S24.

[0020] By doing so, even if the photographing time is extremely short, stable recording and reproduction can be performed.

[0021]

As explained above, according to the present invention, by changing the run-up section from tape rewinding to the start of recording, tape running during recording is stabilized regardless of recording conditions, and image quality deterioration is minimized. Can record.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the invention.

FIG. 2 is a diagram showing a tape rewinding mode in the same embodiment.

FIG. 3 is a flowchart showing control operations of the system controller in normal continuous shooting and interval recording modes.

FIG. 4 is a flowchart showing control operations of a system controller according to another embodiment of the present invention.

FIG. 5 is a diagram showing a tape path of a VTR and a regulating force applied to the tape.

FIG. 6 is a diagram showing a conventional tape rewinding mode.

FIG. 7 is a diagram showing a recording pattern on a tape when interval recording is performed by a conventional method.

[Explanation of symbols]

9 S reel motor 10 S reel motor drive circuit 20 System controller 21　Operation section 24 Interval setting switch

Claims (3)

[Claims] 1. A rotary head type recording device, comprising: a rewinding means for rewinding the tape by a predetermined amount when recording is stopped; and a setting means for setting a tape run-up section until the start of recording according to the amount of rewinding by the rewinding means. A rotary head type recording apparatus comprising: changing means for changing the amount of rewinding by the rewinding means. 2. The changing means is characterized in that when recording is stopped in an interval recording mode in which recording is automatically performed for a predetermined period at regular intervals, the rewinding amount is made larger than when recording is stopped according to an operation of an operating member. The rotary head type recording device according to claim 1. 3. The rotary head type recording apparatus according to claim 1, wherein the changing means changes the amount of rewinding according to the length of recording time immediately before recording is stopped.