JP3433691B2 - Image signal recording / reproducing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to image signal recording / reproducing 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. Regarding 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. In addition, in recent years, a digital V that conforms to the DV standard
TR is also becoming popular.

In a DV standard VTR, index information such as date information indicating the date when an image signal (and an audio signal) is recorded and still image recording information indicating that the image signal is still image data is stored in a predetermined format on a magnetic tape. Area (subcode area)
It is being recorded in. Therefore, by referring to such index information at the time of reproduction, the transition of the date data of the recorded tape is searched, the date search function for cue reproduction and the still image recording part are searched,
It is possible to realize a still image search and search function for cue playback.

[0004]

[Problems to be Solved by the Invention] However, VHS
In the VTR of the system, what corresponds to the index information of the DV standard is not stipulated. Therefore, when the tape recorded in the VTR of the DV standard is reproduced and the reproduced signal is recorded in the VTR of the VHS standard, the dubbing is performed. 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 convenient to search for a desired portion when reproducing the dubbed tape.

The present invention has been made 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 dubb it to a tape-shaped recording medium. An object of the present invention is to provide an image signal recording / reproducing apparatus which can improve convenience at the time of reproducing a dubbed image signal by utilizing index information reproduced at the same time.

[0006]

In order to achieve the above object, the invention according to claim 1 is a digital apparatus for reproducing the image signal and the index information from a recording medium in which the image signal and the index information are recorded as a digital signal. An image signal recording / reproducing apparatus comprising: a recording signal reproducing means; and an analog image signal recording means for recording an image signal reproduced by the digital recording signal reproducing means on an inclined track on a tape-shaped recording medium by an analog signal. The recording medium is provided with a control track on which a control signal serving as a reference for tracking at the time of reproduction is recorded in parallel with the traveling direction thereof, and the index information 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 invention, in the image signal recording / reproducing apparatus according to the first aspect, among the index information reproduced by the digital recording signal reproducing means,
The index code generating means includes a designating means for a user to designate index information for which a corresponding index code should be generated, and the index code generating means generates an index code corresponding to the index information designated by the designating means. And

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION 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 digital recording video cassette recorder (VCR) and analog recording. VC
It is a double-deck type VCR that accommodates R and R in one housing. That is, the apparatus of FIG. 1 performs recording / reproduction of a digital VCR section which records and reproduces an image signal and an audio signal which are digitized according to the DV standard, and records and reproduces an image signal and an audio signal by an analog signal which conforms to the VHS standard. It is composed of an analog VCR section. It should be noted that FIG. 1 shows only the main part of the reproducing system of the digital VCR section and the main part of the recording system of the analog VCR section.

The digital VCR section reproduces a signal recorded on a DV standard magnetic tape 1, a magnetic head 2, a data detection circuit 3, and a data separation / error correction decoding (DE).
MUX & ECC) circuit 4, reproduction signal processing circuit 5, and D
An A / 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 "microcomputer 10"), and an index content designation switch 11 are provided. There is. The analog VCR section 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 signals 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) is a sub-code 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 about a track, and date information,
Index information such as still image position information and a user-specified mark indicating a position specified by the user is recorded in the subcode area. Further, 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 is a linear audio track for recording an audio signal, and an inclination for recording an image signal and an audio signal. 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 in the vicinity of the lower end of the magnetic tape 19 in parallel with the tape running direction, as shown in FIG.

According to the VHS standard, two kinds of duty cycles of control signals recorded on a control track are made to correspond to logic "0" and "1", and VISS for searching a recording position on a magnetic tape at high speed. (VHS
The INDEX SEARCH SYSTEM) code is defined. More specifically, as shown in the lower part of FIG. 3, one cycle in which the duty cycle of the control signal is long (for example, one cycle of 75%) is associated with the logic “0”,
1-bit information is recorded by associating one cycle with a short duty cycle (for example, one cycle of 25%) with a logic "1". As shown in FIG. 4, the VISS code has two bits "0" and 61 bits "1" arranged between them.
Composed of. Since the VISS code is recorded on the control track, it can be reliably detected even when the magnetic tape is run at high speed. Therefore, by referring to this, high-speed cueing can be performed.

Next, the operation of the apparatus shown in FIG. 1 when dubbing the signal reproduced from the magnetic tape 1 by the digital VCR section on the magnetic tape 19 by the analog VCR section will be described. When the digital VCR unit is set to the reproduction mode, the 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, and the image data, the audio data, and the subcode recorded in the subcode area are respectively extracted, and the 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 deshuffle process is a reverse process of the shuffle process performed at the time of recording in order to make it less susceptible to the influence of a block error, whereby the original data is restored. 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 section.
6 is supplied.

The analog VCR section is in the recording mode, and the signal subjected to the predetermined recording processing by the analog recording processing circuit 17 is recorded on the inclined track of the magnetic tape 19 by the magnetic head 18. Control signal generation circuit 1
Reference numeral 6 generates a control signal based on the vertical synchronizing signal of the input image signal and inputs it to the duty variable circuit 13. The variable duty circuit 13 outputs the control signal that is normally input 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
The subcode separated by is supplied to the subcode detection circuit 7. The subcode detection circuit 7 takes out only the subcode data and inputs it 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 its type, that is, a signal C indicating whether it is date information, a user-specified mark, or still image position information, to the index information comparison circuit. Enter in 9.

Before starting dubbing, the user specifies the kind of index information to be dubbed in advance by the index content designating switch 11, and the microcomputer 10
Is a signal R indicating the index information of the specified type.
Is input to the index information comparison circuit 9. The switch 11 is 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 comparison circuit 9 are compared,
When the two match, a match signal E is output. VISS
When the coincidence signal E is input, the code generation circuit 12 outputs V
The ISS code data (FIG. 4) is duty-variable circuit 13 bit by bit in synchronization with a reference signal synchronized with the control signal input from the control signal generation circuit 16.
Supply to. The duty variable circuit 13 performs the process of changing the duty cycle depending on whether the input bit is "0" or "1" as described above. This allows DV
The VISS code corresponding to the index information reproduced from the standard magnetic tape 1 is recorded on the 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. 5 shows a case where a transition of date information is designated as index information to be dubbed,
The VISS code is recorded corresponding to the change of the date information. FIG. 6 shows a case where a user-specified mark is specified as index information for dubbing, 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 for dubbing, and a VISS code is recorded near the start position of still image recording.

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

The present invention is not limited to the above-described embodiment, but various modifications can be made. 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. The digital VCR section is not limited to the one conforming to the DV standard, but may be one conforming to the D-VHS (registered trademark) standard, for example, and a hard disk device in which the recording medium is a disk-shaped medium. Or an optical disk device.

[0020]

As described above in detail, according to the present invention, the index information reproduced by the digital recording signal reproducing means is extracted, the index code corresponding to the index information is generated, and 1 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 two kinds of duty cycles of the control signal. Therefore, when reproducing the signal recorded on the tape-shaped recording medium, By referring to the code, it is possible to search for a desired recording portion at high speed.

[Brief description of drawings]

FIG. 1 is a block diagram showing 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 with 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 showing an example of an index code.

FIG. 5 is a diagram for explaining a relationship between index information recorded as 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]

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 reproduction signal processing circuit ( Digital recording signal reproduction means 6 D / A conversion circuit (digital recording signal reproduction means) 7 Subcode detection circuit (index code generation means) 8 Index information detection circuit (index code generation means) 9 Index information comparison circuit (index code generation) Means) 10 Microcomputer (designating means) 11 Index content designation 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)

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Claims (2)

(57) [Claims] 1. A digital recording signal reproducing means for reproducing the image signal and the index information from a recording medium in 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. In an image signal recording / reproducing apparatus provided with an analog image signal recording means for recording an analog signal on an inclined track on a tape-shaped recording medium, a control signal serving as a reference for tracking during reproduction is recorded on the tape-shaped recording medium. A control track which is provided in parallel with the traveling direction of the control track, extracts index information reproduced by the digital recording signal reproducing means, and generates an index code corresponding to the index information; One bit of the index code is used as the control Image signal recording / reproducing device, comprising: an index code recording unit for recording the control track in correspondence with two types of duty cycles of the video signal. 2. The index code generating means includes a designating means for allowing a user to designate index information for which a corresponding index code is to be generated, of the index information reproduced by the digital recording signal reproducing means. The image signal recording / reproducing apparatus according to claim 1, wherein an index code corresponding to the index information designated by the designating means is generated.