JPH0686201A - Recording and reproducing device for still picture in magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain still picture information with a small number of tracks by recording the still picture information of one frame or one field by performing a still picture operation on a magnetic tape, recording the control signal of a code representing a still picture at a code generating part simultane ously, and stopping tape feed by a code detecting part in reproduction. CONSTITUTION:A moving image mode switch 41 and a still picture mode switch 42 are switched by system code roll system 4, and when a moving image mode is set, a video signal inputted to a terminal 11 is supplied to a video recording signal system 1 via a changeover switch 21, and it is recorded on the magnetic tape 8. Also, the code representing the moving image mode is inputted to a control head 83 via an amplifier circuit 44 by controlling a code generation circuit 43. Thence, when the switch 41 is switched to the switch 42, the switch 21 is switched to a video signal storage system 2, and the code representing the still picture mode is inputted to the control head 83 via the amplifier circuit 44 by controlling the code generation circuit 43.

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 using a magnetic tape, which is capable of recording still picture information and automatically reproducing a still picture from the magnetic tape.

[0002]

2. Description of the Related Art During travel and daily life, it is common practice to prepare both a camera and a video camera for recording and use them properly. However, when traveling 2
Since it is cumbersome to carry different types of cameras, it has been demanded that one video camera also functions as a camera.

If one frame of the moving picture of the video signal is fixed, that is, it is a still picture, by switching the video camera to the still picture mode, one frame of the moving picture is stored in the memory and repeated on the running magnetic tape. Something to record is proposed ("Videocom", July 1990 issue)
82-84).

[0004]

Although the device can record and reproduce still images using a video camera, it consumes a magnetic tape for at least 5 seconds to make still images. There is a problem that the magnetic tape is consumed more than necessary. Further, in order to record a large number of still images on one magnetic tape, the still image time of one screen is inevitably shortened. Therefore, when this is reproduced, the still images are switched one after another and cannot be appreciated. Although still image information is continuously inserted in the moving image information on the magnetic tape, it was not possible to determine at which position on the magnetic tape the still image was recorded.

The present invention provides a magnetic tape with one frame or one
A magnetic recording device capable of recording a large number of still images is disclosed by recording a still image for a field and at the same time recording a control signal for displaying the still image. Further, the present invention clarifies a device capable of automatically detecting and reproducing a recorded portion of still image information from a magnetic tape.

[0006]

According to the present invention, there is provided an operation unit for switching between a moving image mode and a still image mode, and an image recording unit which is connected to the operation unit and records a one-frame image signal on a magnetic tape. A still image recording apparatus, which is connected to an operation unit and includes a code creating unit for recording a control signal representing a still image on a magnetic tape. Further, the present invention receives a still image signal detecting section for detecting a control signal representing a still image from a running magnetic tape and an output signal of the still image signal detecting section, switches the apparatus to a still image reproducing mode, and uses a capstan. It is a still image reproducing apparatus including a control unit for stopping tape feeding and a video reproducing unit for scanning a stationary magnetic tape and reproducing a video signal of one frame.

[0007]

When recording, by switching the operation unit of the video camera to the still image mode, the code creation unit records the control signal representing the still image on the magnetic tape, and the video recording unit records the video signal of one frame or one field. Is recorded on the magnetic tape, the tape feed is stopped. A moving image can be continuously recorded or a still image on another screen can be recorded by switching the operation unit.

During reproduction, when a control signal representing a still image is detected from the running magnetic tape, the control unit switches the apparatus to a still image reproduction mode, stops tape feeding, and the magnetic head is loaded on the cylinder surface. A still image can be reproduced by repeatedly performing a helical scan on the still image signal recording location of the magnetic tape stopped at.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention can be applied to both the VHS system shown in FIGS. 1 and 2 and the 8 mm video system shown in FIGS.

First Embodiment In the present invention, when the video camera is of the VHS system,
As shown in FIG. 3, a control track (82) on a magnetic tape (8) is used to record a control signal representing still image information by a control head (83). VHS
The system employs the CTL coating system, which makes the duty ratio (square wave width) of the 30 Hz control signal recorded in the control track (8) 60.
% Or 27.5%, which is a recording method. Here, 60% is a "0" pulse and 27.5% is a "1" pulse. At the time of reproduction, since only the positive pulse of the square wave is picked up and the servo is applied, no matter what width the square wave at the time of recording has, only the rising portion is 30
If it is accurate in Hz, there is no problem during reproduction. When the above method is adopted and a still image signal is recorded, a predetermined control signal "1001" or the like is recorded on the control track (82) on the magnetic tape (8). Here, although the control signal is represented as a 4-bit signal in this embodiment, it may be represented by another number of bits, or a header or the like may be added. However, the smaller the number of bits, the less the consumption of the magnetic tape.

(When recording a moving image) In FIG. 1, the input terminal (1
The video signal input to 1) is sent to the known signal recording system (1) via the changeover switch (21). The luminance signal Y is processed by the emphasis circuit (12), the modulation circuit (13), and the filter circuit (14), and the chroma signal is processed by the emphasis circuit (16),
A magnetic tape (8) is processed by a low-frequency conversion circuit (17) and a filter (18), and then passed through a mixing section (15) and a video head (19).
Is recorded to.

The servo system (3) is a cylinder motor (31)
On the other hand, the speed error circuit (37) and the phase error circuit (36) are provided, and the error mixing circuit (38) controls the cylinder motor as is known.

The phase error circuit (36) extracts the vertical synchronizing signal from the video signal by the vertical synchronizing signal separating circuit (34), converts it into a 30 Hz signal through a frequency dividing circuit (35) by a counter, and PG ( Pulse generator) Detects the phase shift with (32). The speed error circuit (37) receives a signal from an FG (frequency generator) (33) provided for the cylinder and detects a deviation of the rotation speed.

Further, the tape feeding system (5) uses the output from the error mixing circuit (56) which processes the signals of the phase error circuit (54) and the speed error circuit (55) to output the capstan motor (5).
1) is controlled, and the phase error circuit (54) divides the 30 Hz signal from the frequency dividing circuit (35) and the detection signal of the FG (52) arranged opposite to the capstan drive motor (51). Circuit (5
Compare through 3).

In the system control system (4), the control circuit (49) switches the changeover switch (21) by switching operation of the moving image mode switch (41) and the still image mode switch (42), As is well known, input terminal
The video signal input to (11) is supplied to the video recording signal system (1) via the changeover switch (21) and recorded on the magnetic tape (8).
When the moving image mode switch is operated, the code creating circuit (43) is controlled to create a code representing the moving image mode, for example, a control signal with a duty ratio of 60% in accordance with the timing of the vertical synchronizing signal, and an amplifying circuit. It is input to the control head (83) via (44) and recorded on the control track (82) of the magnetic tape (8).

(When recording a still image)
2), the control circuit (49) changes the switch (2)
Switch 1) to the image signal storage system (2). Further, the control circuit (49) controls the code creation circuit (43) to create a control signal of the code representing the still image mode, for example, "1001" in synchronization with the timing of the vertical synchronizing signal, and passes through the amplification circuit (44). Input to the control head (83) and record on the control track (82) of the magnetic tape (8). The control head (83) has a control track (82) on the magnetic tape (8).
After the control signal is recorded in, the mode control circuit (47) stops the capstan motor (51), and the magnetic tape is stopped in the loading state in the cylinder. The reason why the capstan (51) is stopped after a predetermined time coefficient is that if the control signal is recorded and then the capstan (51) is stopped immediately, inconvenience will occur during reproduction described later. That is,
This is because if the control signal is detected and the capstan (51) is stopped, the desired still image cannot be reproduced by passing through the still image signal recording location. Therefore, the mode control circuit
At (47), it is judged that the recording of the control signal is completed, and a predetermined time is added as a factor (the predetermined time may be, for example, a time for recording several fields), and then the capstan (51) is stopped. Set to mode. Although not shown here, the recording of the video signal is also stopped when the stop mode is entered.

The video signal input to the input terminal (11) is always input to the image signal recording system (2), and the A / D converter (2
It is converted to a digital signal in 2) and written to the memory (23) at any time. When the still image mode switch is operated in this state, writing in the memory (23) is stopped by the control circuit (49). Then, the stored signal of one frame or one field stored in the memory (23) is converted into an analog signal by the D / A conversion (24), and is passed through the switch (21) to the signal recording system (1).
Input to the magnetic tape (8) by the video head (19)
Is recorded on the video track (81).

(At the time of reproduction) The video signal recorded on the magnetic tape (8) is detected by the video head (19) as shown in FIG. 2 and processed by the known reproduction system (6). Video signal is high pass filter (61) and low pass filter (66)
Are separated into a luminance signal Y and a chroma signal C, and the luminance signal is processed by an equalizer (62), a demodulation circuit (63), a filter (64) and a de-emphasis circuit (65). The chroma signal is processed by the filter (67), the de-emphasis circuit (68), the frequency conversion circuit (69) and the filter (60). Mixed circuit
The luminance signal and the chrominance signal are mixed at (91) and output from an output terminal (9) for connecting to a display or a video printer.

The servo system (3) and tape feeding system (5) are
The signal recording structure is almost the same as that shown in FIG. 1, and members given the same reference numerals have the same structure. In the case of the signal recording configuration, the phase error circuits (36) and (54) are based on the vertical synchronization signal separated from the video signal and divided by 1/2. It is based on the signal from (39). Here, the phase error circuit (54) compares the 30 Hz signal from the reference frequency oscillation circuit (39) and the control signal (positive pulse) reproduced by the control head (83) and divided.

The control signal reproduced from the control head (83) is processed by the code detection circuit (46), and the code of the control signal of the control track (82) indicates the recording of predetermined still image information. When it is detected that the control signal code "1001" matches, the control circuit (49) switches the mode control circuit (47) to the still picture mode, and issues a control signal to the tape feeding system (5) to cap it. The stun motor (51) is stopped and the magnetic tape is stopped in the loading state with respect to the cylinder. Since the video head (19) repeats helical scan on the same video track for the magnetic tape (8), a still image signal is output from the output terminal (9).

To switch the still image on the screen to the next still image, the fast-forward switch (48) may be operated. The fast-forward switch (48) outputs a tape fast-forward signal to the control circuit (49), and the capstan motor (51) fast-forwards the tape. When the control head (83) detects a control signal representing the next still image information, the control circuit (49) outputs the still image mode again, stops the tape feeding system (5), and outputs the output terminal (9 ) Outputs the next still image information. The control circuit (49) has a switch (not shown) for searching for a control signal representing still image information,
By operating this switch, the fast-forward mode is set, and when the control signal is searched, the stop mode is entered. Then, to search for the next control signal, operate the fast-forward switch.

Second Embodiment FIGS. 4 and 5 show a recording structure and a reproducing structure when the present invention is applied to an 8 mm video system, respectively. The 8 mm videotape (8) is a video track (8) as shown in Figure 6.
The sub area (85) is provided as a user area between the PCM area (84) and the video information area (86) of 1). Unlike the VHS system, the 8 mm video system does not have a control track and a control head on the magnetic tape (8), and instead has an ATF (Automatic Track Finding) circuit (as shown in FIG. It is a circuit that includes 7), records four types of pilot signals on the tape, processes the signals at the time of reproduction, detects the trace position of the head, and outputs an error signal. The timing circuit (71) sets the timing for writing the video area (86) and the subcode area (85) in the video track.

At the time of signal recording, the video head (19) helically scans the magnetic tape (8) to record the video track (81). Only when the mode is switched to the still image mode, a code indicating the still image information, such as "1", is displayed in the sub code area (85).
The control signal is represented as a 4-bit signal in the present embodiment, but it may be represented by other number of bits. Further, after recording the control signal, as in the first embodiment,
The mode control circuit (47) continues recording the still image signal for a predetermined time, and then stops the capstan (51).

During playback, the video head has a video track (81)
When the control signal (4) is scanned and a control signal representing still image information is detected from the sub code area (85), the control circuit (49) causes the mode control circuit (4
7) is switched to the still image mode, a control signal is issued to the tape feeding system (5) to stop the capstan motor (51), and the magnetic tape is stopped in the loading state with respect to the cylinder. As a result, a still image signal is output from the output terminal (9).

The 8 mm system reproduction structure is a known structure shown in FIG. 5, in which the ATF error circuit (57) processes the four kinds of recorded pilot signals to detect the head trace position and detect the error. Output a signal. The error signal and the speed error signal are mixed by the error mixing circuit (56) to control the capstan motor (51). The other constituent elements are the same as the constituent elements denoted by the same reference numerals in FIGS. 1 and 2, and the description thereof will be omitted.

[0026]

The present invention records a control signal representing a still image mode on the magnetic tape in the still image code creating section (43) at the same time as recording a still image and stops the tape feeding system after a predetermined time has passed. A large number of still images can be recorded on one magnetic tape, and the tape consumption for still image recording is saved. Moreover, since the magnetic tape is stopped by detecting the control signal simultaneously recorded on the magnetic tape, the still image can be searched quickly and accurately no matter where on the magnetic tape the still image is recorded. You can

The above description of the embodiments is for explaining the present invention and should not be construed as limiting the invention described in the claims or reducing the scope. The configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims. For example, in the still image reproduction mode, the control circuit (49) may fast-forward the magnetic tape every timer setting time (for example, 1 minute) to automatically switch the still image reproduced on the display.

[Brief description of drawings]

FIG. 1 is a VHS recording structure.

FIG. 2 is a VHS system playback configuration.

FIG. 3 is an explanatory diagram showing a signal recording state on a magnetic tape in a VHS system.

FIG. 4 is a recording configuration in an 8 mm video system.

FIG. 5 is a reproduction configuration in the 8 mm video system.

FIG. 6 is an explanatory diagram showing a signal recording state on an 8 mm video type magnetic tape.

[Explanation of main symbols]

 (1) Signal recording system (19) Video head (2) Video signal storage system (21) Changeover switch (3) Servo system (31) Cylinder motor (4) System control system (41) Video switch (42) Still image switch (43) Code creation circuit (46) Code detection circuit (47) Mode control circuit (49) Control circuit (5) Tape feed system (51) Capstan motor (6) Playback system (8) Magnetic tape (81) Video track (82) Control track (83) Control head (35) Sub area

Claims (2)

[Claims] 1. An apparatus for recording and reproducing a video signal on a magnetic tape by a magnetic head, and an operation section for switching between a moving image mode and a still image mode, and an image of one frame or one field connected to the operation section. A still image in a magnetic recording / reproducing apparatus, comprising: a video recording unit for recording a signal on a magnetic tape; and a code creating unit, which is connected to the operation unit, for recording a control signal representing a still image on the magnetic tape. Recording device. 2. In a device for recording and reproducing a video signal on a magnetic tape by a magnetic head, a still image signal detecting section for detecting a control signal representing a still image from a running magnetic tape, and the still image signal detecting section. And a video playback unit for switching the device to the still image playback mode and stopping the tape feeding by the capstan, and for playing the video signal of one frame or one field by scanning the stationary magnetic tape. A still image reproducing apparatus in a magnetic recording / reproducing apparatus comprising: