JP2000268442A - Image signal recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the image signal recording and reproducing device which can reproduce and dub an image signal from a recording medium where index information is digitally recorded together with the image signal to a tape type recording medium and improve convenience in the reproduction of the dubbed image signal by making good use of the index information reproduced at the same time. SOLUTION: Index code (VISS code) (8) are generated corresponding to date information reproduced from a tape of the DV standards and index information such as a user specified mark. The index codes are recorded on the control track of a magnetic tape by varying the duty cycle of a control signal on which the tracking of reproduction is based.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image signal recording / reproducing apparatus having a function of reproducing a recording medium on which index information is digitally recorded together with an image signal, and a function of analog-recording the reproduced image signal on a tape-shaped recording medium. Related to the device.

[0002]

2. Description of the Related Art An analog VTR (video tape recorder) conforming to the VHS (registered trademark) standard is widely used as a home image signal recording / reproducing apparatus. Also, in recent years, digital V
TRs are also beginning to spread.

[0003] In a VTR of the DV standard, index information such as date information indicating a date when an image signal (and an audio signal) is recorded and still image recording information indicating that there is still image data is written on a predetermined magnetic tape. Area (subcode area)
It has been recorded. Therefore, by referring to such index information at the time of reproduction, a change of the date data of the recorded tape is searched, and a date search function for cueing reproduction and a still image recording portion are searched.
A still image search / search function for cueing playback can be realized.

[0004]

However, VHS
In the VTR of the system, since there is no definition corresponding to the index information of the DV standard, a tape recorded by the VTR of the DV standard is reproduced, and when dubbing the reproduced signal by the VTR of the VHS standard is performed. However, the image signal and the audio signal can be recorded as they are, but the index information cannot be recorded. Therefore, it is not easy and inconvenient to search for a desired part when reproducing the dubbed tape.

The present invention has been made by paying attention to this point, and it is possible to reproduce an image signal from a recording medium in which index information is digitally recorded together with the image signal and dub it to a tape-shaped recording medium. It is an object of the present invention to provide an image signal recording / reproducing apparatus which can improve convenience when reproducing an image signal dubbed by utilizing index information reproduced at the same time.

[0006]

According to a first aspect of the present invention, there is provided a digital camera for reproducing an image signal and index information from a recording medium on which the image signal and index information are recorded as digital signals. An image signal recording / reproducing apparatus comprising: a recording signal reproducing unit; and an analog image signal recording unit for recording an image signal reproduced by the digital recording signal reproducing unit on a tilted track on a tape-shaped recording medium as an analog signal. A control track on which a control signal to be used as a reference for tracking at the time of reproduction is recorded is provided parallel to the running direction of the recording medium, and the index information to be reproduced by the digital recording signal reproducing means is extracted. , An index code for generating an index code corresponding to the index information And de generation means, characterized in that it comprises a index code recording means for recording one bit of the index code in two types of the control track in correspondence with the duty cycle of the control signal.

According to a second aspect of the present invention, in the image signal recording / reproducing apparatus according to the first aspect, the index information reproduced by the digital recording signal reproducing means includes:
There is provided a designating means for a user to designate index information for which a corresponding index code is to be generated, wherein the index code generating means generates an index code corresponding to the index information specified by the designating means. And

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a main part of an image signal recording / reproducing apparatus according to an embodiment of the present invention. This apparatus performs a video cassette recorder (VCR) for performing digital recording and an analog recording. VC
This is a double-deck type VCR in which R is housed in one case. That is, the apparatus shown in FIG. 1 performs recording and reproduction of a digital video signal and an audio signal conforming to the DV standard, and performs recording and reproduction of an image signal and an audio signal based on an analog signal conforming to the VHS standard. It is composed of an analog VCR unit. FIG. 1 shows only a main part of the reproduction system of the digital VCR unit and a main part of the recording system of the analog VCR unit.

The digital VCR section includes a magnetic head 2 for reproducing signals recorded on a DV standard magnetic tape 1, a data detection circuit 3, and a data separation / error correction decoding (DE).
MUX & ECC) circuit 4, a reproduced signal processing circuit 5,
/ A conversion circuit 6, a subcode detection circuit 7, an index information detection circuit 8, an index information comparison circuit 9, a microcomputer 10 (hereinafter, referred to as a "microcomputer 10"), and an index content designation switch 11. I have. The analog VCR unit includes a VISS code generation circuit 12, a control signal generation circuit 16, a duty variable circuit 13, a control signal recording circuit 14,
Control head 15 and analog recording processing circuit 17
And a magnetic head 18 for recording a signal on a VHS standard magnetic tape 19.

The recording pattern on the DV standard magnetic tape 1 is determined as shown in FIG. 2, and one recording track (inclined track) has a subcode area for recording information for search and control information. , A video area for recording an image signal, an audio area for recording an audio signal, and an ITI (insert track information) area for recording information on a track.
Still image position information and index information such as a user-specified mark indicating a position specified by the user are recorded in the subcode area. The recording pattern on the VHS standard magnetic tape 19 is determined as shown in FIG. 3, and is provided near the upper end of the tape and has a linear audio track for recording an audio signal and a tilt for recording an image signal and an audio signal. It comprises a track and a control track for recording a control signal used as a reference for tracking control during reproduction. The control track is provided near the lower end of the magnetic tape 19 in parallel with the tape running direction, as shown in FIG.

In the VHS standard, two types of duty cycles of a control signal recorded on a control track correspond to logic "0" and "1", and a VISS for searching a recording position on a magnetic tape at high speed. (VHS
INDEX SEARCH SYSTEM) code is defined. More specifically, as shown in the lower part of FIG. 3, one cycle (for example, one cycle of 75%) in which the duty cycle of the control signal is long corresponds to logic "0",
One-bit information is recorded in such a manner that one cycle having a short duty cycle (for example, one cycle of 25%) corresponds to logic "1". As shown in FIG. 4, the VISS code has two bits “0” and 61 bits “1” arranged therebetween.
It consists of. Since the VISS code is recorded on the control track, it can be reliably detected even when the magnetic tape runs at high speed. Therefore, high-speed cueing can be performed by referring to this.

Next, the operation of the apparatus shown in FIG. 1 when dubbing a signal reproduced from the magnetic tape 1 by the digital VCR unit and recording it on the magnetic tape 19 by the analog VCR unit will be described. When the digital VCR unit is set to the reproduction mode, data reproduced from the magnetic tape 1 by the magnetic head 2 is restored by the data detector 3 as digital data. This data is input to the data separation / error correction decoding circuit 4, where the image data, the audio data, and the subcode recorded in the subcode area are respectively extracted, and error correction decoding processing and the like are performed. The extracted image data and audio data are input to the reproduction signal processing circuit 5, and subjected to decompression processing, deshuffle processing, and the like. The deshuffling process is a reverse process of the shuffling process performed at the time of recording in order to make the data less susceptible to a block error, thereby restoring the original data. The output signal of the reproduction signal processing circuit 5 is converted into an analog signal by the D / A conversion circuit 6, and the analog recording processing circuit 17 and the control signal generation circuit 1 of the analog VCR unit are used.
6.

The analog VCR section is in a recording mode, and a signal subjected to a predetermined recording process by an analog recording processing circuit 17 is recorded on an inclined track of a magnetic tape 19 by a magnetic head 18. Control signal generation circuit 1
6 generates a control signal based on a vertical synchronizing signal of the input image signal, and inputs the control signal to the duty variable circuit 13. The duty variable circuit 13 outputs a normally input control signal as it is. The control signal recording circuit 14 records the control signal on the control track of the magnetic tape 19 by the control head 15.

On the other hand, the data separation / error correction decoding circuit 4
Are supplied to the sub-code detection circuit 7. The subcode detection circuit 7 extracts only the data of the subcode and inputs the data to the index information detection circuit 8. The index information detection circuit 8 extracts the index information included in the subcode and outputs a signal C indicating the type, that is, a signal C indicating any of date information, a user-specified mark, and still image position information, to an index information comparison circuit. Enter 9

Before starting dubbing, the user specifies in advance the type of index information to be dubbed by the index content specifying switch 11 and
Is a signal R indicating the designated type of index information.
Is input to the index information comparison circuit 9. The switch 11 is constituted by a mechanical switch or an on-screen software switch.

When dubbing is started, the signal C and the signal R input to the index information comparing circuit 9 are compared with each other.
When the two match, a match signal E is output. VISS
When the coincidence signal E is input, the code generation circuit 12
The ISS code data (FIG. 4) is synchronized with a reference signal synchronized with the control signal input from the control signal generation circuit 16 by one bit at a time to the duty variable circuit 13.
To supply. The duty variable circuit 13 performs the process of changing the duty cycle according to whether the input bit is “0” or “1” as described above. Thereby, DV
A VISS code corresponding to the index information reproduced from the standard magnetic tape 1 is recorded on a control track of the magnetic tape 19.

FIGS. 5 to 7 are image diagrams showing the relationship between the index information recorded on the DV standard tape 1 and the corresponding VISS code recorded on the VHS standard tape 19. FIG. FIG. 5 shows a case where a transition of date information is specified as index information to be dubbed,
A VISS code is recorded corresponding to the transition of the date information. FIG. 6 shows a case where a user-specified mark is specified as index information to be dubbed, and a VISS code is recorded near the position where the user-specified mark ends.
FIG. 7 shows a case where still image position information is designated as index information to be dubbed, and a VISS code is recorded near the start position of still image recording.

As described above, in the present embodiment, when the content recorded on the DV standard tape 1 is dubbed to the VHS standard tape 19, of the index information recorded on the tape 1, When the information is reproduced, a VISS code corresponding to the index information is recorded on the control track. Therefore, when the tape 19 is reproduced, a desired recorded portion can be searched at high speed by referring to the VISS code.

The present invention is not limited to the embodiment described above, and various modifications are possible. For example, the index code recorded on the control track is not limited to the VISS code shown in FIG. 4, and a plurality of codes may be provided corresponding to the index information to be reproduced. Further, the digital VCR unit is not limited to the one conforming to the DV standard, but may be, for example, one conforming to the D-VHS (registered trademark) standard. Or an optical disk device.

[0020]

As described above in detail, according to the present invention, index information reproduced by the digital recording signal reproducing means is extracted, an index code corresponding to the index information is generated, and one bit of the index code is generated. Is recorded on a control track provided in parallel with the running direction of the tape-shaped recording medium in correspondence with the two types of duty cycles of the control signal. Therefore, when reproducing the signal recorded on the tape-shaped recording medium, the index is used. By referring to the code, a desired recorded portion can be searched at high speed.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an image signal recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a recording pattern on a magnetic tape recorded by a digital signal.

FIG. 3 is a diagram showing a recording pattern on a magnetic tape recorded by an analog signal.

FIG. 4 is a diagram illustrating an example of an index code.

FIG. 5 is a diagram for explaining a relationship between index information recorded by a digital signal and an index code recorded on a control track.

FIG. 6 is a diagram for explaining a relationship between index information recorded by a digital signal and an index code recorded on a control track.

FIG. 7 is a diagram for explaining a relationship between index information recorded by a digital signal and an index code recorded on a control track.

[Explanation of symbols]

Reference Signs List 1 magnetic tape (recording medium) 2 magnetic head (digital recording signal reproducing means) 3 data detection circuit (digital recording signal reproducing means) 4 data separation / error correction decoding circuit (digital recording signal reproducing means) 5 reproduced signal processing circuit ( Digital recording signal reproducing means 6 D / A conversion circuit (digital recording signal reproducing means) 7 Subcode detecting circuit (index code generating means) 8 Index information detecting circuit (index code generating means) 9 Index information comparing circuit (index code generating) Means) 10 microcomputer (designating means) 11 index content designating switch (designating means) 12 VISS code generating circuit (index code generating means) 13 duty variable circuit (index code recording means) 14 control signal recording circuit (index code) Recording means) 15 control head (index code recording means) 16 control signal generation circuit (index code recording means) 17 analog recording processing circuit (analog image signal recording means) 18 magnetic head (analog image signal recording means) 19 magnetic tape (tape) Recording medium)

Claims (2)

[Claims] A digital recording signal reproducing means for reproducing the image signal and the index information from a recording medium on which the image signal and the index information are recorded as a digital signal, and an image signal reproduced by the digital recording signal reproducing means. An image signal recording / reproducing apparatus comprising: an analog image signal recording unit that records an analog signal on an inclined track on a tape-shaped recording medium; wherein the tape-shaped recording medium records a control signal as a reference for tracking during reproduction. An index code generating means for extracting index information reproduced by the digital recording signal reproducing means and generating an index code corresponding to the index information; and One bit of the index code is stored in the control An image signal recording / reproducing apparatus, comprising: an index code recording means for recording on the control track in correspondence with two types of duty cycles of the control signal. 2. The system according to claim 1, further comprising: a designation unit for designating, by a user, index information for generating a corresponding index code among the index information reproduced by the digital recording signal reproduction unit, wherein the index code generation unit includes: 2. The image signal recording / reproducing apparatus according to claim 1, wherein an index code corresponding to the index information specified by the specifying unit is generated.