JPH10174032A - Digital recording video camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record/reproduce an image through the selective use of two kinds or over of recording and reproducing devices whose recording media differ depending on the application and to record-/reproduce an image through the selective use of a moving image companding system depending on the application among two kinds of moving image companding systems or over. SOLUTION: The video camera has a video camera section 1 and a recording and reproducing device section 2 as separate units, two kinds of recording and reproducing devices or over among an optical disk recording and reproducing device, a hard disk recording and reproducing device, a removable hard disk recording and reproducing device, a tape recording and reproducing device are employed for the recording and reproducing section 2 and they have a common interface and a coupling device with the video camera section 1 respectively. Furthermore, companding circuits adopting two systems or over among the Motion JPEG, the MPEG(moving picture experts group) 1, the MPEG 2, the MPEG 4 and the DV format and its changeover switch are provided to the recording and reproducing section 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital recording video camera using a digital recording method.

[0002]

2. Description of the Related Art Conventionally, as a video camera of this type,
Digital recording video cameras using a tape medium called DVC are commercially available. In this video camera,
A compression method defined as the DV format is adopted, and a tape recording / reproducing device is built in the video camera body as a recording / reproducing device.

As another video camera, a digital recording video camera using a magneto-optical disk is disclosed in Japanese Patent Laid-Open No.
-255028. In this video camera, a magneto-optical disk recording / reproducing device is built in the video camera body as a recording / reproducing device.

Further, as another video camera, a digital recording video camera capable of selecting a moving image recording and a still image recording at the time of recording is disclosed in Japanese Patent Laid-Open No. 6-276470. An identification signal is added at the time of recording according to the selection of moving image recording or still image recording, and moving image recording or still image recording can be identified and reproduced at the time of reproduction. In this video camera, a tape recording / reproducing device is built in the video camera body as a recording / reproducing device.

[0005] As another video camera, a digital recording video camera using a hard disk is commercially available. In this video camera, a hard disk recording / reproducing device is detachably provided as a recording / reproducing device in the video camera body.

As another video camera, a camera called a digital process camera for broadcasting is commercially available. In this video camera, MII
Recording and reproduction are possible by mounting a small-sized tape recording / reproducing apparatus of the system, and the tape recording / reproducing apparatus can be used as a single VTR by separating from the video camera body.

[0007]

However, in each of the above-mentioned conventional digital recording video cameras, the recording method is fixed for each device, so that recording and reproduction can be performed only by a recording and reproducing apparatus corresponding to one type of recording medium. There was a problem.

[0008] Further, when a moving image is compressed and recorded, there is a problem that the recording method cannot be changed by changing the compression recording method according to the application since the compression method is fixed to one method.

The present invention solves such a conventional problem. It is possible to selectively use two or more types of recording / reproducing devices having different recording media in accordance with the application, and to perform recording / reproducing. It is an object of the present invention to provide an excellent digital recording video camera capable of selecting a moving image compression / decompression method from two or more types of moving image compression / decompression methods according to the application and recording / reproducing.

[0010]

In a digital recording video camera according to the present invention, a video camera section and a recording / reproducing apparatus section are separably connected to each other, and the recording / reproducing apparatus section includes an optical disk recording / reproducing apparatus and a hard disk recording / reproducing apparatus. apparatus,
It has a removable hard disk recording / reproducing device and a tape recording / reproducing device, and a common connection interface and coupling mechanism between these recording / reproducing devices and a video camera so that a compression recording method can be selected and recorded / reproduced according to the application. I have. In the recording / reproducing device section, Motion JPEG, MPEG1, MP
A compression / expansion circuit of any two or more of the EG2, MPEG4, and DV formats and a switch for switching the compression / expansion are provided, and one camera is used to switch between any two or more compression / expansion methods for recording and reproduction. I can do it.

Therefore, two or more types of recording / reproducing apparatuses having different recording media can be exchanged and recorded / reproduced according to the application, and a moving image compression / expansion method can be selected from among two or more types of moving image compression / decompression methods. The recording / reproduction can be performed by selecting the / extension method.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A digital recording video camera according to a first aspect of the present invention comprises a video camera section and a recording / reproducing apparatus section which can be separated, and the recording / reproducing apparatus section includes an optical disk recording / reproducing apparatus and a hard disk recording apparatus. It has two or more types of recording / reproducing devices among a reproducing device, a removable hard disk recording / reproducing device, and a tape recording / reproducing device, each having a common connection interface and coupling mechanism with a video camera unit, and depending on the application. This has the effect that various types of recording / reproducing devices can be used properly.

According to a second aspect of the present invention, there is provided a digital recording video camera according to the first aspect, wherein the recording / reproducing device section includes a Moti as a digital moving image compression / expansion method.
on JPEG (Joint Photo-graphic Image Coding Experts G
roup), MPEG1 (Moving Picture Experts Group Phase
1), MPEG2 (Moving Picture Experts Group Phase 2),
Equipped with a compression / expansion circuit of any two or more of MPEG4 (Moving Picture Experts Group Phase 4) and DV format, and a switch for switching the compression / expansion circuit. The recording and reproduction can be performed by switching the system, and has the effect that the compression recording system can be selected according to the application.

According to a third aspect of the present invention, in the digital recording video camera according to the second aspect of the present invention, the identification signal is added to the recording / reproducing device according to the selection of the digital moving image compression method at the time of recording. Means, and a means for identifying a digital moving image compression method recorded during reproduction and reproducing the data in a decompression method corresponding to the compression method, and discriminating which compression method was recorded during reproduction. This has the effect that the decompression method corresponding to the compression method can be automatically selected and reproduced.

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIGS. (Embodiment 1) FIG. 1 shows the external appearance of an entire digital recording video camera according to Embodiment 1 of the present invention. FIG. 1 (a) shows a video camera section 1 and a recording / reproducing apparatus section 2 thereof.
(B) shows a mode in which the video camera section 1 and the recording / reproducing apparatus section 2 are separated from each other. In this digital recording video camera, FIG.
As is clear from FIG. 1, the recording / reproducing device section 2 is detachably attached to the video camera section 1, and has a structure in which both can be separated. The recording / reproducing device unit 2 is provided with an optical disk recording / reproducing device, a hard disk recording / reproducing device, a removable hard disk recording / reproducing device, a tape recording / reproducing device, etc., according to various types of recording media. The interface and the coupling mechanism are common.

Here, in the video camera section 1, as shown in FIG. 2, an optical lens 11, an image pickup device 12,
And a process amplifier 13.

In the recording / reproducing device section 2, FIG.
As shown in the figure, the A / D converter 21 and the D / A converter 2
2, a compression / decompression circuit 23, a data stream control circuit 24, an interface circuit 25, and a recording medium driving device 26. Reference numeral 3 denotes an external monitor.

Next, the operation of the digital recording video camera of the first embodiment will be described. (Operation of Recording Process) In FIG.
The image light incident through 1 is converted into an electric signal by the image sensor 12, and the image signal output from the image sensor 12 is amplified and adjusted by the process amplifier 13. Next, the analog video signal output from the process amplifier 13 is converted into a digital signal by the A / D converter 21, and the video data output from the A / D converter 21 is compressed by the compression / decompression circuit 23 by a predetermined compression method. Compressed. Next, the video data compressed by the compression / decompression circuit 23 is converted by the data stream control circuit 24 into video data conforming to the recording format of the recording medium, and the recording medium driving device 26 is controlled via the interface circuit 25, It is recorded on a recording medium.

(Operation of Reproduction Process) In FIG. 2, the data stream control circuit 24
5, the recording medium driving device 26 is controlled, and the compressed video data recorded on the recording medium is read. Next, the compressed / decompressed circuit 23 decompresses the compressed data by a predetermined decompression method, converts the digital signal into an analog signal by the D / A converter 22, and outputs the reproduced video by the external monitor 3.

As described above, according to the first embodiment, the video camera section 1 and the recording / reproducing apparatus section 2 are provided so as to be separable and connectable, and the recording / reproducing apparatus section 2 includes an optical disk recording / reproducing apparatus, a hard disk recording / reproducing apparatus, Since a removable hard disk recording / reproducing device and a tape recording / reproducing device are prepared, and a connection interface and a coupling mechanism with the video camera unit 1 are commonly used, an arbitrary recording / reproducing device is selected and recorded / reproduced according to the application. be able to.

(Embodiment 2) FIG. 3 shows a configuration of each section of a digital recording video camera according to Embodiment 2 of the present invention. In the second embodiment, in the configuration of the first embodiment, as a compression circuit, a Motion JPEG compression circuit 231, an MPEG1 compression circuit 232, and an MPEG2 compression circuit 2
33, which are connected to the A / D conversion unit 21 via the changeover switch 27, respectively, and include a Motion JPEG decompression circuit 234, an MPEG1 decompression circuit 235, and an MPEG2 decompression circuit 236 as decompression circuits. And a changeover switch 2 for the data stream control circuit 24, respectively.
8. The other components are the same as those in the first embodiment, and the same reference numerals are given here, and the duplicate description will be omitted.

Next, the operation of the digital recording video camera of the second embodiment will be described. The operation in the recording process is as follows. First, an analog video signal output from the video camera unit 1 is converted into a digital signal by the A / D conversion unit 21, and the video data output from the A / D conversion unit 21 is According to the purpose and situation of the above, compression is performed by selecting from three compression circuits of the Motion JPEG compression circuit 231, the MPEG1 compression circuit 232, and the MPEG2 compression circuit 233 by the changeover switch 27. Here, the Motion JPEG compression circuit 231 is selected. Hereinafter, the first embodiment
In the same manner as in the operation described above, the compressed video data is converted by the data stream control circuit 24 into video data conforming to the recording format of the recording medium, and the interface circuit 2
5, the recording medium driving device 26 is controlled and recorded on the recording medium.

The operation in the reproducing process is performed by the data stream control circuit 24 by the interface circuit 25.
, The recording medium driving device 26 is controlled, and the compressed video data recorded on the recording medium is read. Then
Motion JPEG decompression circuit 2
34, an MPEG1 decompression circuit 235 and an MPEG2 decompression circuit 236, a decompression circuit corresponding to the compression method at the time of recording,
The on-JPEG decompression circuit 234 is selected, the compressed data is decompressed, the digital signal is converted to an analog signal by the D / A converter 22, and the reproduced video is output by the external monitor 3.

As described above, according to the second embodiment, since a plurality of compression / decompression circuits 231 to 236 and their changeover switches 27 and 28 are provided, an arbitrary compression / decompression method can be selected according to the application. Recording and reproduction can be performed.

(Embodiment 3) FIG. 4 shows the configuration of each part of a digital recording video camera according to Embodiment 3 of the present invention. In the third embodiment, in addition to the configuration of the second embodiment, a compression system identification signal generated by a compression switch selected by a changeover switch is superimposed on the compressed video data by a data stream control circuit. A circuit comprising: a generation circuit 41; a compression system identification signal detection circuit 42 for detecting a compression system based on a compression system identification signal; and a switcher 43 for selecting an expansion circuit according to the compression system detected by the compression system identification signal detection circuit 42. It is.

FIG. 5 shows the structure of the data track 5 recorded on the recording medium used here. In FIG. 5, 50 is a start code indicating the start and address of data, 51 is an identification code indicating the Motion JPEG compression method,
52 is an identification code representing the MPEG2 compression method, 53 is an identification code representing the MPEG1 compression method, 54 is a code representing the following data length, 55 is video data compressed by the Motion JPEG compression method, and 56 is compressed by the MPEG2 compression method. The video data 57 is video data compressed by the MPEG1 compression method.

Next, the operation of the digital recording video camera of the third embodiment will be described. First, the operation in the recording process is as follows. An analog video signal output from the video camera unit 1 is converted into a digital signal by the A / D conversion unit 21, and the video data output from the A / D conversion unit 21 is captured. The compression method is selected from the compression circuits 231 to 233 by the changeover switch 27 according to the purpose and situation of the compression. At the same time, the compression system identification signal generation circuit 4
1 generates an identification signal of the selected compression system.
Next, the data stream control circuit 24 superimposes the compressed video data and the compression method identification signal to convert them into video data and a compression method identification code that match the recording format of the recording medium. The medium driving device 26 is controlled and recorded on the recording medium.

The operation in the reproducing process is performed by the data stream control circuit 24 by the interface circuit 25.
, The recording medium driving device 26 is controlled, and the compressed video data and the compression method identification code recorded on the recording medium are read. Next, the compression system identification signal detection circuit 42 detects the compression system, and the switcher 43 uses the expansion circuits 234 to 23 corresponding to the compression system at the time of recording.
6 is automatically selected. The compressed data is decompressed by a predetermined decompression method, subsequently converted from a digital signal to an analog signal by the D / A converter 22, and the reproduced video is output by the external monitor 3.

As described above, according to the third embodiment, the compression system identification signal generation circuit 41, the compression system identification signal detection circuit 42 and the switcher 43 are provided.
The compression system identification signal generation circuit 41 adds the compressed video data and the compression system identification code and records the data on a recording medium, and the compression system identification signal detection circuit 42 and the switcher 43 at the time of reproduction use the expansion corresponding to the compression system at the time of recording. Circuit 23
4 to 236 can be automatically selected and reproduced.

In the above description, a case has been described in which recording / reproducing is performed by switching among three methods of the Motion JPEG compression method, the MPEG1 compression method, and the MPEG2 compression method as the compression / expansion method. The same applies to the case where a compression method is used.

[0031]

As described above, according to the present invention, a video camera section and a recording / reproducing apparatus section are separably connected to each other, and as the recording / reproducing apparatus section, an optical disk recording / reproducing apparatus, a hard disk recording / reproducing apparatus, and a removable hard disk are provided. Since at least two of the recording / reproducing apparatus and the tape recording / reproducing apparatus can be used interchangeably, it is possible to select two or more types of recording / reproducing methods according to the intended use for recording / reproducing. The effect that it can be obtained is obtained.

Further, since one video camera can switch between two or more types of compression / decompression methods for recording and reproduction, it is possible to obtain the effect of selecting and recording a compression recording method according to the application.

Further, at the time of recording, recording is performed by adding an identification signal according to the selection of the digital moving picture compression method, and at the time of reproduction, the recorded digital moving picture compression method can be identified and reproduced by an expansion method corresponding to the compression method. So that
The effect is obtained that the data can be automatically reproduced by the decompression method corresponding to the compression method at the time of recording.

[Brief description of the drawings]

FIG. 1A is an external view of a digital recording camera according to a first embodiment of the present invention in which a video camera unit and a recording / reproducing device unit are combined; FIG. 1B is a digital recording camera according to the first embodiment of the present invention; In the figure, an external view of a mode in which a video camera unit and a recording / reproducing device unit are separated.

FIG. 2 is a block diagram showing a configuration of each section of the digital recording camera according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of each section of a digital recording camera according to Embodiment 2 of the present invention.

FIG. 4 is a block diagram showing a configuration of each section of a digital recording camera according to Embodiment 3 of the present invention.

FIG. 5 is a data array diagram on a data track recorded on a recording medium used for a digital recording camera according to Embodiment 3 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Video camera part 11 Optical lens 12 Image sensor 13 Process amplifier 2 Recording / reproducing apparatus part 21 A / D conversion part 22 D / A conversion part 23 Compression / expansion circuit 231 Motion JPEG compression circuit 232 MPEG1 compression circuit 233 MPEG2 compression circuit 234 Motion JPEG decompression circuit 235 MPEG1 decompression circuit 236 MPEG2 decompression circuit 24 data stream control circuit 25 interface circuit 26 recording medium drive device 27, 28 switch 3 external monitor 41 compression method identification signal generation circuit 42 compression method identification signal detection circuit 43 switcher 5 recording Media data track

Claims (3)

[Claims] 1. A video camera unit and a recording / reproducing device unit are provided so as to be separable, and the recording / reproducing device unit is an optical disk recording / reproducing device, a hard disk recording / reproducing device, a removable hard disk recording / reproducing device, or a tape recording / reproducing device. A digital recording video camera having two or more types of recording / reproducing devices, each having a common connection interface and coupling mechanism with the video camera unit. 2. A recording / reproducing apparatus section, which uses Motion JPEG (Joint Photo-grap) as a digital moving image compression / decompression method.
hic Image Coding Experts Group), MPEG1 (Moving Pi
cture Experts Group Phase 1), MPEG2 (Moving Pictur
e Experts Group Phase 2), MPEG4 (Moving Picture Ex
2. The digital recording video camera according to claim 1, further comprising a compression / expansion circuit of at least two of the perts Group Phase 4) and the DV format, and a switch for changing over the compression / expansion circuit. 3. A recording / reproducing apparatus unit for adding an identification signal according to selection of a digital moving picture compression method at the time of recording, and identifying a digital moving picture compression method recorded at the time of reproduction and corresponding to the compression method. 3. The digital recording video camera according to claim 2, further comprising: means for reproducing in an expansion system.