JP3371185B2 - Playback 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 reproducing apparatus suitable for use in a camera-integrated VTR having a still image recording mode.

[0002]

2. Description of the Related Art A digital recording type camera-integrated VT
R is under development. A digital recording type camera-integrated VTR compresses a digital video signal based on an image pickup signal by DCT (Discrete Cosine Transform) conversion and a variable length code, and records it on a magnetic tape by a rotary head. The digital recording type camera-integrated VTR can improve the image quality as compared with the analog type VTR, and almost no deterioration of the image quality due to editing or dubbing occurs. Such a digital recording camera-integrated VTR is provided with not only a normal moving image recording mode but also a still image recording mode.

That is, when recording is performed in the still image recording mode, the image signal of one frame is repeatedly recorded several times. At this time, the shooting date, hour, minute, and second, and the track number of the shot still image are captured. During playback, the shooting date, hour, minute, and second are displayed. The user designates a desired still image by seeing the display of the shooting date, hour, minute, and second. When a desired still image is designated, the track number corresponding to the recording position of this still image is searched. When the track number is searched, the track is paused at that position and the desired still image is reproduced.

[0004]

As described above, when a still picture is reproduced by the digital VTR, the track number of the still picture is searched, and the track is paused at that position.
In a digital recording camera-integrated VTR, track numbers are written in the subcode area, and a search can be performed in track units. Therefore, when the same still image is reproduced many times, the same track is put in a paused state many times, and there is a risk that the tape will be seriously damaged.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a reproducing apparatus which prevents the same track from being temporarily stopped many times during the reproduction of a still image and prevents the tape from being damaged.

[0006]

According to the present invention, there is provided position specifying means for specifying the position of a recording medium, position detecting means for detecting the current position of the recording medium, and random value generating means for generating a random change value. , A random change value is added to the position designated by the position designating means as a target position, and the target position is compared with the current position detected by the position detecting means,
The reproducing apparatus is provided with a control unit that controls the position of the recording medium to a target position.

When reproducing a still image, the track number of the start frame of the still image is designated. A random value is added to this track number. The track number of the frame to which this random value is added is searched. In this way, since a random value is added to the track number of the start frame of a still image and searching is performed, the same track will not be paused many times during still image playback, and the tape Damage can be prevented.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes the entire camera-integrated VTR main body. A lens 11 is provided on the front surface of the camera-integrated VTR body 1. A subject image is captured via this lens 11.
Further, a microphone 12 is provided on the front surface of the camera-integrated VTR body 1. Through this microphone 12,
External sound is picked up. In front of the microphone 12,
A front remote control light receiving unit 13 that receives infrared light from the remote controller 2 is provided. On the back of the handle 15,
A rear remote control light receiver 14 is provided.

A cassette mounting portion 16 is provided on the side surface of the camera-integrated VTR body 1. The cassette mounting portion 16 is openable and closable, and a tape cassette (not shown) is mounted in the cassette mounting portion 16. A tape cassette having a tape width of 1/4 inch is used. In addition, this tape cassette is MIC (Memory InC
The one with a built-in semiconductor memory called assete) can be used. At the top of the cassette mounting part 16,
An operation panel 17 is provided. On the operation panel 17, operation keys for recording, reproducing, rewinding, fast-forwarding, etc. are arranged. A viewfinder 18 is provided on the rear surface of the camera-integrated VTR body 1. A battery mounting portion 19 is provided on the rear surface of the camera-integrated VTR body 1.

The camera-integrated VTR body 1 can be operated by a remote controller. FIG. 2 shows the remote controller 2. The remote controller 2 is provided with VTR operation setting keys such as a rewind key 31, a reproduction key 32, a fast forward key 33, forward and reverse direction frame feed keys 34 and 35, and a stop key 36. Also, the pause key 37 and the slow playback key 3
8, keys for variable speed reproduction such as a double speed key 39 are arranged. Further, a search selection key 40 and search keys 41 and 42 for forward and reverse directions are arranged. Further, to start / stop keys 43, zoom keys 44, 45, and other keys related to camera operation, a photo key 46 for shooting a still image, a print key 47 for printing out the shot screen, and a position counter for resetting. A zero set memory key 48, a screen display key 49, and a data code key 50 for viewing the information of the camera such as the recorded date and time during reproduction are arranged.

FIG. 3 shows the structure of the camera-integrated VTR main body 1. In FIG. 3, reference numeral 61 is a lens.
At the time of recording, the subject image light is incident via the lens 61. The subject image light is focused on the light receiving surface of the CCD image pickup device 62. The subject image is photoelectrically converted by the CCD image pickup device 62. The output of the CCD image pickup device 62 is supplied to the A / D converter 64 via the AGC circuit 63.
The image pickup signal is digitized by the A / D converter 64. The output of the A / D converter 64 is supplied to the camera signal processing circuit 65. The camera signal processing circuit 65 performs signal processing such as gamma correction and aperture correction, and forms a digital component color video signal from the image pickup signal.

The output of the camera signal processing circuit 65 is supplied to the compression circuit 66, which compresses the video signal by DCT conversion and variable length coding. The output of the compression circuit 66 is supplied to the error correction coding and code addition circuit 67. Error correction coding and code addition circuit 67
Then, the error correction code is added to the video data and the additional information VAUX is added.

Reference numeral 68 is a microphone. The voice is picked up by the microphone 68. The audio signal from the microphone 68 is supplied to the A / D converter 69. The audio signal is digitized by the A / D converter 69. The output of the A / D converter 69 is supplied to the audio signal processing circuit 70. The output of the audio signal processing circuit 70 is supplied to the error correction coding and code addition circuit 67. The error correction coding and code addition circuit 67 adds an error correction code to the audio data and also adds additional information AAUX.

In the additional information VAUX and AAUX, data other than video data and audio data such as recording date and recording time can be written. Further, the system controller 75 outputs subcode data. This subcode data is supplied to the error correction coding and code addition circuit 67. Subcode data includes
The absolute track number is included.

Error correction coding and code addition circuit 67
Then, the video data, the audio data, and the subcode data are time-division multiplexed. The output of this error correction coding and code addition circuit 67 is the channel coder 71.
Is supplied to. The recording signal is modulated by the channel coder 71. The output of the channel coder 71 is supplied to the heads 72A and 72B.

Data is recorded on the magnetic tape 73 by the heads 72A and 72B. As the magnetic tape 73, a tape having a tape width of 1/4 inch is used. A semiconductor memory 74 called MIC is built in the cassette in which the magnetic tape 73 is stored. This semiconductor memory 7
Information such as the tape length and the type of tape can be recorded in 4, and information such as recorded contents and title can be stored.

The additional information AAUX, VAUX, subcode data, and cassette memory information are recorded in a pack structure based on 5 bytes. Among these packs, as shown in FIG. 4, a pack showing recording date, hour, minute and second, and, as shown in FIG. 5, a pack used for tags are included. Of these packs, the first pack PC0 is a header. Data is recorded in the remaining 4 bytes.

As shown in FIG. 4, in the pack indicating the recording date, hour, minute and second, the first 1 byte PC0 is the recording date,
The header is used to indicate that the pack indicates hours, minutes, and seconds.
Next to PC1, record mode "RM", minute "MINUTE
S ”is arranged. The next PC2 is "WEEK" on the day of the week,
The hour "HOURS", the month "MONTH", and the day "DAY" are arranged. The year "YEAR" is placed on the next PC4.

As shown in FIG. 5, in the tag pack, the first 1 byte PC0 is used as a header indicating that it is a tag pack. Track numbers are assigned to the next PC1 to PC3. Further, the PC 1 is provided with a blank flag “BF” indicating whether or not there is an unrecorded portion in the middle of the tape. The PC4 has a text flag “TEXT” indicating whether there is text information and a tag ID “TAG”.
ID ”is provided. This tag ID includes information indicating whether it is a still image.

In one track, as shown in FIG.
An I area, an audio area, a video area, and a subcode area are provided. The absolute number of the track is recorded in the sub code area. Then, as shown in FIG. 7, one frame of image is recorded on 10 tracks.

In FIG. 3, at the time of reproduction, the head 71A
And 71B are supplied to the channel decoder 76. The reproduced data is demodulated by the channel decoder 76. The output of the channel coder 76 is supplied to the error correction and code separation circuit 77. The error correction and code separation circuit 77 separates the reproduction data from the video data, the audio data, and the subcode data. Then, error correction processing of the video data and audio data is performed, and the additional information VAUX and AAUX of the video data and audio data are taken out.
These additional information VAUX, AAUX and subcode data are supplied to the system controller 75.

The video data from the error correction and code separation circuit 77 is supplied to the decompression circuit 78. The decompression circuit 78 decompresses the video data. The output of the expansion circuit 78 is supplied to the D / A converter 79. The output of the D / A converter 79 is output from the output terminal 80.

The audio data from the error correction and code separation circuit 77 is supplied to the audio reproduction processing circuit 81. The output of the audio reproduction processing circuit 81 is D / A
It is supplied to the converter 82. The output of the D / A converter 82 is output from the output terminal 83.

The system controller 75 controls the entire VTR main body 1 with a built-in camera. An input is given to the system controller 75 from the input key 84. Further, the infrared signal from the remote controller 2 is received by the light receiving unit 85, and the output of the light receiving unit 85 is supplied to the system controller 71.

The still image shooting in this digital VTR will be described. As shown in FIG. 2, the remote controller 2 has a photo key 4 for taking a still image.
6 is provided. With this photo key 46, still image shooting can be performed. When the still image shooting is performed in this manner, information on the recording date, hour, minute, and second is automatically generated. This information is stored in the pack indicating the recording date and hour / minute / second in FIG. Then, the track number indicating the start position of the still image is stored in the tag pack of FIG.

During reproduction of a still image, the search selection key 40 is pressed to display the photo search menu as shown in FIG. The user can use this photo search menu
Select the desired still image from the shooting date, hour, minute, and second. Here, when the desired still image is selected by the search keys 41 and 42, the track number corresponding to the selected still image is searched, and the track is paused at that position.

Track numbers are written in the sub-code area, and a search can be performed in track units.
Therefore, when the same still image is reproduced many times, the same track is put in a paused state many times, and there is a risk that the tape will be seriously damaged. In view of this, in one embodiment of the present invention, when a search is performed during still image reproduction, the temporary stop state is not repeated many times on the same track so that the tape is not damaged.

That is, as shown in FIG.
It is assumed that a still image is recorded starting from the track number “200”. Since one frame is recorded with 10 tracks, the track numbers “210”, “220”, ... Are the head track numbers of each frame, and in the still image recording mode, the same image is recorded in each frame.

Normally, if a still image whose track number starts from "200" is selected, the track number "23" is selected.
"0" is searched, and the reproduction is paused at the frame starting from the track number "230". When searching for a still image whose track number starts with "200",
The reason why the frame starting from the track number “230” is searched is to provide a margin of, for example, 3 frames in order to reliably reproduce the still image. For this reason, for example, if a still image whose track number starts from "200" is selected many times, the playback is paused many times at the frame starting from the track number "230", which may damage the tape. There is.

Therefore, in one embodiment of the present invention, when a still image whose track number starts with "200" is selected,
For example, a track number at a place where a margin of 3 frames is added and further a random number of frames of "0" to "9" is added is searched. "0" ~
As the random frame number of “9”, for example, the ones digit of the second at the current time can be used.

That is, it is assumed that a still image whose track number starts from "200" is selected. At this time, the second of the current time is "25 seconds", and the ones digit of the second of the current time is "5".
It was. In this case, track number "200"
Is added with a “30” track corresponding to 3 frames of the margin, and further, a “50” track corresponding to 5 frames of 1s of the second of the current time is added, and a track starting from the track number “280” is added. The reproduction is paused at the frame searched for and starting from the track number "280".

Similarly, the track number is "200".
It is assumed that a still image starting with is selected, and that the second of the current time is “41 seconds” and the ones digit of the second of the current time is “1”. In this case, the track number is "200",
"30" tracks corresponding to three frames of the margin are added, and further "10" tracks corresponding to one frame of the ones digit of the second at the current time are added, and the track number "2" is added.
The track starting from "40" is searched, and the reproduction is paused at the frame starting from the track number "240".

As described above, even if the same still picture is designated, the track to be searched will be different within the search range of 10 frames, so that the same track will not be put into a pause state many times. Therefore, damage to the tape is avoided.

FIG. 11 is a flow chart showing the operation at the time of still image search. As shown in FIG. 11, it is determined whether or not a search command is given (step S1), and if the search command is given, the designated start position of the still image is called (step S2). Then, for example, a margin of 3 frames is added to the start position of the still image. (Step S3). Further, the second digit of the current time is captured (step S4), and the second digit of the current time is further added to the start position of the still image (step S4).
4). A track corresponding to a frame obtained by adding, for example, a margin of 3 frames to this current time and further adding 1's digit of the second at the current time is set as a target position.

The tape is fed at high speed (step S6),
The subcode is read, and the track number is read from this subcode (step S7). The current track number read from this subcode is compared with the target position of the track (step S8), and high-speed feeding is continued until the current track number and the target position of the track match. When the current track number and the target position of the track match, the reproduction is paused at that position (step S9).

In the above embodiment, a random value is generated by using the ones digit of the second at the current time, and this value is added to set the search target position. The generation of the value is not limited to this.

[0037]

According to the present invention, the track number of the start frame of a still image is designated when reproducing the still image. A random value is added to this track number. The track number of the frame to which this random value is added is searched. In this way, since a random value is added to the track number of the start frame of a still image and the search is performed, the same track is not paused many times during playback of the still image, and the tape is damaged. Can be prevented.

[Brief description of drawings]

FIG. 1 is a side view of an example of a camera-integrated VTR to which the present invention is applied.

FIG. 2 is a plan view of an example of a remote controller of a camera-integrated VTR to which the present invention is applied.

FIG. 3 is a block diagram showing a configuration of a camera-integrated VTR to which the present invention is applied.

FIG. 4 is a schematic diagram used for explaining a camera-integrated VTR to which the present invention is applied.

FIG. 5 is a schematic diagram used for explaining a camera-integrated VTR to which the present invention is applied.

FIG. 6 is a schematic diagram used for explaining a track arrangement of a camera-integrated VTR to which the present invention is applied.

FIG. 7 is a schematic diagram used to describe a camera-integrated VTR to which the present invention is applied.

FIG. 8 is a schematic diagram used to describe a camera-integrated VTR to which the present invention is applied.

FIG. 9 is a schematic diagram used to describe a camera-integrated VTR to which the present invention is applied.

FIG. 10 is a schematic diagram used for explaining a camera-integrated VTR to which the present invention is applied.

FIG. 11 is a flowchart used for explaining a camera-integrated VTR to which the present invention is applied.

[Explanation of symbols]

1 Camera integrated VTR 2 Remote controller 40 Search selection key 41, 42 Search key

Claims (2)

(57) [Claims] 1. A position specifying means for specifying a position of a recording medium, a position detecting means for detecting a current position of the recording medium, a random value generating means for generating a random value, and the random value for the position. In addition to the position designated by the designating unit, a target position is set, the target position is compared with the current position detected by the position detecting unit, and the control unit controls the position of the recording medium to the target position. A playback device equipped. 2. The reproducing apparatus according to claim 1, wherein the position designating unit designates a position where a still image signal is recorded.