JPH04178986A - Magnetic recording device and magnetic reproducing device - Google Patents

Abstract

PURPOSE:To easily retrieve recorded information at a high speed by providing a recording means which records retrieval information of the recorded information at the end of the already recorded section of a tape-like recording medium. CONSTITUTION:A magnetic tape 26 is put on the outer periphery of a rotary drum 40 for about 100 deg. without loading the tape 26. This magnetic recording device and reproducing device adopts a helical scanning system and the rotating axis of the drum 40 is inclined against the length direction of the tape at a fixed angle and information, such as videos, sounds etc., image pickup information, and retrieval information are obliquely recorded on the tape 26 by rotating the drum 40 while the tape 26 is run by means of a reel driving means. Therefore, cuing can be performed at a high speed and the retrieval information can be processed easily under a light burden.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetic recording device and a magnetic reproducing device, and more specifically, to a magnetic recording device and a magnetic reproducing device. The present invention relates to a recording device and a magnetic reproducing device.

[Prior Art] A magnetic recording method is known in which video signals, audio signals, data, etc. are digitally recorded on a magnetic tape housed in a small cassette.

[Problem to be solved by the invention] Magnetic tape is essentially a sequential access medium, so basically the only way to find the recording start point or playback position is to fast-forward the tape, during which time you have to wait. It has the disadvantage that it cannot be used.

An object of the present invention is to provide a magnetic recording device and a magnetic reproducing device that eliminate these drawbacks.

[Means for Solving the Problems] A magnetic recording device according to the present invention is characterized by having a recording means for recording search information of recorded information at the end of a recorded portion of a tape-shaped recording medium. Further, the magnetic reproducing apparatus according to the present invention is characterized in that it has a reproducing control means for controlling the reproducing operation of recorded information based on search information recorded at the end of the recorded portion of the tape-shaped recording medium.

[Operation] The search information described above makes it possible to search recorded information easily and quickly.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a schematic block diagram of an embodiment of the present invention applied to a camera-integrated video tape recorder.

Reference numeral 10 denotes a photographing optical system including an aperture and an autofocus mechanism, and the optical image thereof is converted into an electrical signal by an image sensor 12. The image signal output from the image sensor 12 is
The A/D converter 14 converts the signal into a digital signal.

Also, audio is input from the microphone 16, and the A/D converter 1
8 is converted into a digital signal. A/D converter 1
Photographed video data output from 4 and A/D converter 18
The audio data output from the digital signal processing circuit (
DSP) 20.

The DSP 20 temporarily stores the image signal in a memory 22 having a storage capacity for at least one frame, subsamples the image signal, etc. into a predetermined number of blocks (four blocks in this embodiment), and sequentially reads out each block for recording and reproduction. Output to circuit 24. The recording/reproducing circuit 24 transmits 1 through an electromagnetic conversion system.
One track per block is recorded on the magnetic tape 26.

Further, the second release switch 28 is closed when a release button (not shown) is pushed in a little, and the second release switch 30 is closed when the release button is further pushed in. 32 is a continuous shooting mode switch for setting continuous shooting mode. A system control circuit 34 provides overall control in response to switches 28, 30 and 32. The system control circuit 34 also supplies, via the memory 22, shooting information such as shooting date and time, aperture value, and whether or not a strobe is used, as well as search information regarding the number of shots and the number of recording blocks, to the DSP 20, as will be described in detail later. The signal is recorded on the magnetic tape 26 along with the signal.

FIG. 2 shows an external view of the tape cassette in which the magnetic tape 26 is stored. When the lid 36 on the front surface of the cassette is opened, the magnetic tape 26 is exposed to the outside. Third
The figure is a plan view showing tape arrangement within a tape cassette. When the tape cassette is loaded, as shown in FIG.
0 is moved into the cassette and pressed against the magnetic tape 26. In this embodiment, the magnetic tape 26 can be wound around the outer periphery of the rotating drum 40 over approximately 100 degrees without loading the magnetic tape.

In this example, a helical scan method is adopted.
The central axis of rotation of the rotating drum 40 is inclined at a certain angle with respect to the longitudinal direction of the magnetic tape 26, and by running the magnetic tape 26 by a reel driving means (not shown) while rotating the rotating drum 40, images and Information such as audio, as well as photographing information and search information are obliquely recorded on the magnetic tape 26, as shown in FIG.

Next, the subsampling and recording pattern of this embodiment will be explained with reference to FIGS. 4 and 5.

In this embodiment, one screen (for example, 6
5(A) and (B) by controlling the readout of the memory 22.
, (C) and (D), respectively. That is, the first block consists of odd-numbered pixels on odd-numbered lines, the second block consists of even-numbered pixels on even-numbered lines, the third block consists of even-numbered pixels on odd-numbered lines, and the fourth block consists of even-numbered pixels on even-numbered lines. Consists of odd-numbered pixels.

These blocks are sequentially recorded on separate tracks as shown in FIG. In Fig. 6, 1-a is the first block of the first image, 1-b is the second block of the first image, 1-c is the third block of the first image, 1-d
indicates the fourth block of the first image. 2-a shows the first block of the second image. Recording one image 4
Photographing information of this image is recorded in one track preceding the track. Therefore, 5 tracks will be used per image. Furthermore, search information regarding the total number of recorded blocks and the number of recorded images is recorded at the end of the recording of the photographic information and images.

Note that the subsampling method and the combination of pixels to be blocked are not limited to the above-mentioned methods and combinations.

Next, the recording operation of this embodiment will be explained in more detail with reference to FIGS. 7 and 8. When a tape/cassette is inserted (Sl), check whether it is in recording standby mode or not.
2) If it is in the recording standby state, check whether the tape position at the time of installation is an unrecorded part (S3), and if it is an unrecorded part, rewind the tape, search for the recorded part of the search information, and find the beginning of the tape. If it is not an unrecorded part, the tape is fast-forwarded to search for a recorded part of the search information, and stopped at the beginning part (S5). In addition, if search information is not recorded anywhere on the entire tape, such as with a new tape,
In the process of S4, the process stops when the entire tape has been rewound.

The search information is read (S6) and rewound to the beginning of the recorded portion of the search information (S7). In this way, in this embodiment, the tape is sent at high speed to search and read the search information.
The so-called cueing speed of the recording position can be significantly increased.

After that, the system enters the recording standby mode again (S8), the power is turned off or the cassette is ejected (S9), the latest search information is recorded (510), the cassette is ejected (511),
Stop (S12). On the other hand, if there is no instruction to turn off the power or to eject the cassette (S9), when the release switch 28 is turned on (S13), power is supplied to the imaging system (514), and whether or not continuous shooting mode is selected is determined. Check (S
15).

If it is not the continuous shooting mode, it is checked whether or not writing is in progress on the tape (816), and if it is not in progress, the image sensor 12 is exposed to light in response to the release switch 30 being turned on, and the image signal is is written into the memory 22 (S18)
. Note that when the release switch 28 is turned on, photometric calculation is performed, and when the release switch 30 is turned on, only exposure of the image sensor 12 and signal readout are performed.

The signals sampled as described above are read from the memory 22 and recorded on the magnetic tape block by block (S19, 20). Update the search information (S32), and
Return to 8.

If tape writing is in progress in S6, it is determined whether or not the image destruction prohibition mode is in effect (S21). In this embodiment, one image cannot be reproduced unless the image signals of all four blocks are present, so it is necessary to prohibit the next recording operation until the recording of the signals of all four blocks is completed. This is called the No Destruction Mode. If you are not in image destruction prohibition mode (
That is, MODE≠1), an image destruction warning is issued, and (
S22), cancel tape writing (S23), S1
Proceed to step 7.

In the case of image destruction prohibition mode (that is, MODE=1), calculate the time Tw required to write the remaining blocks 524
), the predetermined time Tel, and Tc2 are compared (S25.26
). Tel is the time required to write one block, and Tc2 is the time required to write two blocks. T
If w is shorter than TCl, writing of the fourth block will end midway, so it is necessary to record up to the third block (526), and similarly, if Tw is greater than Tc2, writing up to the first block is performed (S29). ), if Tw is smaller than Tc2 and greater than or equal to 101, recording is performed up to the second block (S28), and the end of tape writing is waited for (S30).

If continuous shooting mode is set in S15, set the recording mode to record up to the second block (S3
1) Perform the recording process from S19 onwards.

In this embodiment, when it is necessary to continue writing on the tape in a short period of time, such as in the snapshot mode, the amount of recorded data is reduced, so that the restriction caused by the slow transmission speed is alleviated.

The fast forward playback operation will be explained with reference to FIG.

In this embodiment, there is a normal fast-forward mode in which only the first block of each image is reproduced and displayed, and a multi-screen fast-forward mode in which four images are simultaneously displayed on a 4-split screen as shown in FIG. Even in multi-screen fast forward mode, the first
Play only the block signal.

When a fast-forward switch (not shown) is operated (data of the first block of the S-th image is loaded into the memory 22 (S4
2) Display on the monitor (S43). It is checked whether the fast forward switch is on (S44), and if it is on, the tape is sent to the recording area for the second image (S45).
, as shown in FIG. 10, data is moved within the memory 22 and the data of the first block of the second image is imported to the position where the image is displayed at the upper left of the monitor screen. From then on, as long as the fast-forward switch is on, the latest reproduced image will be displayed at the top left of the monitor screen. This makes searching easier.

When the fast forward switch is turned off (S44), the data of each remaining block is taken into the memory 22 (S47),
The data is played back and displayed on the entire screen of the monitor (548).

If it is not the multi-image fast forward mode (S41), the data of the first block of the first image is imported into the memory 22 (
S47), data of surrounding pixels are interpolated from the data of the first block as shown in FIG. 11 (S50). Then, it is reproduced and displayed on the entire screen of the monitor (S51). If the fast forward switch is on (S52), the tape is moved to the next data area, that is, the tape position where the second image is recorded (S53), and in the same way, data capture, interpolation, etc. of the first block are performed. and perform playback display (849-51)
. When the fast forward switch is turned off (S52), the data of the remaining blocks are taken into the memory 22 (S47),
The data is reproduced and displayed on the entire screen of the monitor (S48).

As described above, in this embodiment, only the minimum necessary block of data is read out, so high-speed playback can be achieved relatively easily.

In FIG. 9, the pixels of the 2nd 3.4th block are interpolated from the data of the 1st block, but of course, for example, the pixels of the 3rd 4th block can also be interpolated from the data of the 1st and 2nd blocks. You can do it like this.

In the above embodiment, one screen is divided into four blocks, but it may be divided into more or less blocks depending on the required image quality, operating speed, etc. It goes without saying that the image signal may be compressed and recorded on the magnetic tape. Furthermore, the target information is not limited to images and sounds.

[Effects of the Invention] As can be easily understood from the above description, according to the present invention, it is possible to perform cueing at high speed. Moreover, the processing of search information for this purpose is simple and can be performed with less burden.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the configuration of an embodiment of the present invention, FIG. 2 is an external view of the tape cassette, FIG. 3 is a plan view of the inside of the tape cassette, and FIG. 4 is an explanatory diagram of the pixel arrangement of an image. Fifth
The figure is a pixel allocation diagram of the four blocks, Figure 6 is the recording pattern of the magnetic tape, Figures 7 and 8 are a flowchart of the recording operation of Figure 1, Figure 9 is a flowchart of the fast forward playback operation, and Figure 10. 11 is an explanatory diagram of a reproduction screen in the multi-screen fast-forward reproduction mode, and FIG. 11 is an explanatory diagram of an interpolation method. 10: Photographing optical system 12: Imaging device 14/A/D converter 16: Microphone 18: A/D converter 20: Digital signal processing circuit 22: Memory 24: Recording/reproducing circuit 26. Magnetic tape 28: 2nd release switch
30: Second release switch 32: Snapshot mode switch 34 System control circuit 36. Lid 381 Rotating head 40: Rotating drum

Claims (2)

[Claims] (1) A magnetic recording device characterized by having a recording means for recording search information of recorded information at the end of a recorded portion of a tape-shaped recording medium. (2) A magnetic reproducing device characterized by having a reproducing control means for controlling a reproducing operation of recorded information based on search information recorded at the end of a recorded portion of a tape-shaped recording medium.