JPH01235089A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide the function of erasing or recording the absolute time code by providing a detecting means for detecting the information belonging to one information group, means for displaying the results of the detection, means for setting a control mode and means for controlling recording. CONSTITUTION:For example, the failure in detecting the information is announced to a user by the display means 106 when the information belonging to one information group B is not detected. An instruction to permit after- recording is applied to the means 10 for setting the control mode when the user judges that the information can be erased. Then, the means 105 for controlling recording permits the after-recording to the recording means 102. An instruction to prohibit the erasure of the information is applied to the means 107 for setting the control mode when the user judges that the information belonging to the information group B is to be held. Then, the means 105 for controlling the recording prohibits the after-recording to the recording means 102. The selection of whether the absolute time code is erased or not by the user is thereby enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to main information such as audio of R-DAT (rotating head digital audio tape recorder), etc., as well as information related to the main information such as time code and program number. The present invention relates to a recording/reproducing device capable of recording.

Conventional technology In recent years, digital technology has been applied to many fields such as audio and video, CD players, R-DAT, digital/l/VT, etc.
Technologies such as R have been established.

Among them, in addition to basic recording and playback technology, subcode data such as time code, program number, and star ID (a flag indicating the beginning of the program) that correspond to the PCM signal are recorded, and these data are used to cue the beginning etc. High-speed search technology has become important. Furthermore, by rewriting the above-mentioned subcode data using the after-recording function, it is possible to edit the program number without rewriting the PCM signal.

An example of a conventional recording/reproducing device will be described below with reference to the drawings. Note that the R-DAT system will be explained here as an example.

First, the arrangement of subcode data of R-DAT will be explained. FIG. 2 shows the DAT track format. DAT tracks include positive azimuth tracks and minor azimuth tracks. A pair of these two types of tracks is called a frame. One track has three data areas: sub data area 1, main data area, and sub data area 2, and ATF area 1 where ATF signals used for tracking servo are recorded.
, 2, etc. Sub data areas 1 and 2 are areas that mainly record data used for high-speed searches such as time codes, and the main data area is mainly used for P
This is an area for recording CM audio data.

Figure 3 shows the recording format of the subcode.

The sub data area consists of 16 blocks in total, 8 blocks in the first half and 8 blocks in the second half.

The first word 5ync is a pattern for bronc synchronization. 27th and 37th SWl.

SW2 is an identification code called sub-ID.

The fourth word is the even parity of SW1 and SW2. The 5th to 36th word subdata is a data area in which time codes and the like are recorded.

The sub-code of the sub-data area has a format in which two blocks, an even number and an odd number, are treated as one bare block.

The MSB of SW2 is a flag indicating that this block is a block in the sub data area, and 1'' is recorded.The lower 4 bits of SW2 indicate the block address in the sub data area.Sub data area 1 ,2-16
Block addresses from 0 to 16 are assigned to the blocks.

The data ID of the lower 4 bits of the even block SW1 is data for identifying the recording format of the subarea, and when the data ID=oooo, it becomes the audio format. Here, only the audio format will be explained.

The upper 4 bits of SWl in even blocks are controller/l.
/ID. The control consists of four types of ID flags.

TOCID means that the program is TOC (Table
of Contents: A flag indicating that the song is registered in the song's table of contents.

Rather than shortening, it is a flag representing the start point of shortening play, and 33±3 frames are recorded. Shortening play is a function that skips and reproduces a specific portion on a tape, and is supposed to skip from the point with shortening ID=1 to the next point with start ID=1.

The start ID is a flag that represents the start point of the program, and it is long enough to not be missed during high-speed search, and is 300 ± 3o frames ( It is supposed to stand continuously for about 9 seconds).

The priority ID is a flag indicating that the program number recorded in the frame is valid, and its start point must match the start point of the start ID. Therefore, the priority ID cannot be set from the middle of the song. In other words, it is not possible to define two or more program numbers for one song. Further, in the case of a user tape, the priority ID can be set to "1" only when =1 from the start. Like the star) ID, the program number is designed to save a short time when after-recording the program ψ frame by recording only the first 300±30 frames of the program.

The 4th to 6th bits of SW2 in even blocks are Pack ID
It is. PackID is the number of Packs in the subdata.
Indicates whether k data is recorded.

From the program numbers 1 to 3 of SW1 and SW2 in the odd-numbered blocks, data indicates the song number from 00.1 to 799 in BCD 3 digits. The program number is considered valid when it is -1 from the priority in the controller/L/ID.

In the sub data, up to seven pack data consisting of eight words can be recorded over two blocks. Further, in the last eight words of the odd-numbered block, the SP parity of two blocks is recorded. SP parity is
A Reed-Solomon code with an inter-symbol distance of 5 is capable of error correction of up to 2 words and error detection of up to 4 words.

FIG. 4 shows the format of Pack. The final word of the Pack has an even number of harnesses that complete 8 words. This means that a double error detection code is applied along with the SP parity that completes two blocks. Pack data has item data therein. Depending on the item data, time code, TOC, etc.
attributes can be identified.

Table 1 shows the definition of Pack items. Further, FIG. 6 shows the formant tra of the absolute time code when Pack item=0010.

Table 1 Next, high-speed search using subcodes will be explained.

The following methods can be considered for high-speed search using subcodes.

(1) Star) ID Search FIG. 6 shows an example of recording sub IDs and Packs. 6th
In the figure, the start ID indicating the beginning of the song is 300 frames L.
・-m (9 seconds) are recorded continuously. This star 1
- Use ID to locate the beginning of a song and update the displayed song number. For example, if you want to jump to the beginning of the next program while playing program A, set it to FF (fast forward) mode, search for the next star ID, and play at the point where the start ID changes from 0'' to 1. Start.

(2) Program number search The program number that indicates the song number is usually the first 30 of the song.
It is recorded in frame 0, and the priority at that time is 10. and star) ID is 1”.

When you want to search for a target song number or when you want to display the song number, search while playing the program number.

(3) Time code search Read the Pack in which the time code is recorded, display the time code, and search for the target point.

Editing the next program number will be explained.

If you do not record a program number when recording an audio signal, or if the automatic song number detection function that uses silent sections does not work well and does not record the intended program number, you may want to write the program number. can be changed. In the case of a user tape, the program number is only recorded at the beginning of the program, approximately 300 frames (9 seconds).
By performing after-recording of the section and subarea, a new program number, start ID, and priority ID can be recorded. If you want to delete unnecessary program numbers, you can perform after-recording for 9 seconds with priority ID=o and star) ID=O.

By using the after-recording function as described above, it is possible to easily edit program numbers and the like.

FIG. 7 is a block diagram showing the configuration of a first conventional recording/reproducing device. In FIG. 7, 700 is a cylinder;
1a and 701b are recording/reproducing heads. 70
2 is a first type recording section that can record PCM data, a program number in a sub ID, and a start ID, but cannot record an absolute time code. 703 is PCM data, program number in sub ID, star) ID.

and a playback section that can play back absolute time code.

FIG. 8 is a block diagram showing the configuration of a second conventional recording/reproducing apparatus. 800 is a cylinder, 801a.

801b is a recording/reproducing head. 802 is a PC
M data and program number in sub ID, star) I
This is a type 2 recording section that can record D and absolute time codes. Reference numeral 803 is a playback unit that can play back PCM data, the program number in the sub ID, the star ID, and the absolute time code. Table 2 shows a functional comparison between the first conventional recording and reproducing device and the second conventional recording and reproducing device. ○ in the table indicates that it is possible, and × indicates that it is impossible.

Table 2 Here, a tape on which a program number, a start ID, and an absolute time code are recorded is created using a second conventional recording and reproducing device, and a tape with a program number and a start ID is recorded using a second conventional recording and reproducing device. ) When rewriting the ID by after-recording in the sub-data area, it is necessary to ensure that the absolute time code is continuous, so first read the absolute time code before the area to be after-recorded, and then write it consecutively with that absolute time code. Record absolute timecode during after-recording.

FIG. 9 is a timing chart showing the timing of after-recording using the second conventional recording/reproducing device. In FIG. 9, A indicates data recorded on the tape for the first time, B indicates data recorded during after-recording, and C indicates data recorded on the tape after after-recording.

Note that the absolute time code in the figure omits the units of hours and minutes, and only shows units of seconds and frames. For example 2
If it is S32F, it indicates 0:00:02:32 frames. When after-recording a 9-second portion from 3 seconds Q frame to 11 seconds 33 frames, the first conventional recording/playback device reproduces the absolute time code up to 2 seconds 33 frames to check the flow of the absolute time code. Recognize, 3
At 0 frames per second, after-recording begins.

The absolute time code recorded is incremented for each frame. By interpolating the absolute timecode during after-recording as described above, the star
Even when after-recording the D1 program number, the continuity of the absolute time code can be maintained.

Next, after-recording using the first conventional recording/reproducing device will be explained. Since the first conventional recording and reproducing device does not have an absolute time code recording function, it is possible to create a tape on which only a start ID and a program number are recorded.

After-recording is performed on this tape using the first conventional recording and reproducing device, and only the start ID and program number are rewritten, and the absolute time code remains unrecorded, so no particular contradiction occurs.

Problems to be Solved by the Invention However, in the above configuration, the absolute time code, start ID,
There is a problem in that when a tape on which a program number is recorded is after-recorded by the first conventional recording and reproducing device that does not have an absolute time code recording function, the absolute time code is erased.

In view of the above problems, the present invention prohibits after-recording when a recording/playback device that does not have the function of recording an absolute time code attempts to perform after-recording on a tape on which an absolute time code has been recorded. Alternatively, the present invention provides a recording and reproducing apparatus that warns the user that the absolute time code will be erased due to after-recording and allows the user to select whether or not to erase the absolute time code.

Means for Solving the Problems In order to solve the above problems, the recording and reproducing apparatus of the present invention includes:
Information group A consisting of multiple or one type of information
a recording means that can record information group B that is composed of a plurality of pieces of information or one type of information, and a reproduction means that can reproduce both information group A and information group B; A detection means for detecting that information belonging to information group B is included in the information reproduced by the reproduction means, a display means for displaying the detection result of the detection means, and an operation mode of the recording control means. The apparatus includes a control mode setting means, and a recording control means for controlling the recording means based on the detection result of the detection means and the control mode instructed by the control mode setting means.

Operation According to the present invention, when information belonging to information group B is not detected, the display means notifies the user that the information has not been detected, using the above-described configuration. When the user determines that it is okay to erase the information, the user gives an instruction to permit after-recording to the control mode setting means, and the recording control means permits the recording means to perform after-recording. When the user determines to retain the information belonging to the information group B, the user instructs the control mode setting means to prohibit deletion of the information, and the recording control means instructs the recording means to prohibit after-recording. Make it.

Embodiment Hereinafter, a recording/reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a recording/reproducing apparatus in an embodiment of the present invention. In FIG. 1, 1o○ is a cylinder, and 101a and 101b are recording/reproducing heads.

102 is the first type recording section described in the first conventional example. The first type recording section 102' stores PCM data, star) I
D. Has the function of recording program numbers, but does not have the function of recording absolute time codes. Reference numeral 103 is the reproduction section described in the first conventional example. The playback unit 103 is a PCM
It has a playback function of data, absolute time code, program number, star) ID. 104 is an absolute time code detection unit that detects the presence of an absolute time code in the data reproduced by the reproduction unit 103 and outputs a detection flag ATFLAG. Reference numeral 106 denotes a display unit that performs a display to inform the user of the existence of the absolute time code when the absolute time code detection unit 104 detects the absolute time code. 105 is an absolute time code detection unit 10
This is a recording control unit that outputs an after-recording permission flag AFPERi to the first type recording unit 102 based on the detection flag ATFLAG outputted by the control mode setting unit 107 and the control mode flag CMODE outputted by the control mode setting unit 107. Reference numeral 107 denotes a control mode setting unit that outputs a control mode flag CMODE indicating whether or not to permit erasure of absolute time codes by after-recording.

Table 3 shows the correspondence between the absolute time code detection flag ATFLAG and the after-recording permission flag AFPER with respect to the control mode flag CMODE.

However, the logic of each flag is as follows.

That is, only when an absolute time code is detected and the control mode is set to a mode in which erasure of the absolute time code is prohibited, the flow of processing at the time of the next after-recording by the first type recording section 1o2 will be explained.

FIG. 10 is a flowchart showing the flow of processing in the after-recording mode. The recording/playback device enters the after-recording mode at 1ooo, the playback unit 103 enters the playback mode at 1o○1, plays the frame before the area to be after-recorded, and checks whether the absolute time code is recorded at 1oo2. Detect. 1o03
Check whether the absolute time code detection flag ATFLAG is set or not, and if ATFLAG=O,
The after-recording operation for the 1o06 subarea begins. If ATFLAG=1, the control mode flag CMODE is checked in step 1004. If CMODE=1, the after-recording operation for the subarea 1005 is entered, and if CMODE=O, the stop mode 1006(7) is entered.

As described above, according to this embodiment, when subarea after-recording is performed on a tape on which absolute time code has been recorded using a recording/playback device that does not have an absolute time code recording function, the absolute time code is erased. This can be prevented. Furthermore, if the user approves erasure of the absolute time code, after-recording of the star ID and program number can be executed. Furthermore, if you want to completely prevent erasure of the absolute time code, you can eliminate the control mode setting section 107 in FIG. 1 and always prohibit after-recording when the absolute time code detection flag ATFLAG=1. .

In this example, we have explained how to prevent erasure of absolute time code by after-recording, but by performing the same process during normal continuous recording, absolute time code can be prevented from being erased from a tape on which absolute time code has been recorded in advance. By prohibiting continuous recording without recording time code, it is possible to prevent the creation of tapes in which the absolute time code disappears from the middle.

Effects of the Invention As described above, the recording and reproducing apparatus of the present invention can be used in multiple or one
A recording means that can record information group A consisting of different types of information but cannot record information group B consisting of multiple or one type of information, and both information group A and information group B. , a detection means for detecting that information belonging to the information group B is included in the information reproduced by the reproduction means, and a detection result of the detection means is displayed. A display means, a control mode setting means for instructing the operation mode of the recording control means, and a recording control means for controlling the recording means based on the detection result of the detection means and the control mode instructed by the control mode setting means. For example, it is possible to prevent the absolute time code from being erased if after-recording is performed on a tape on which absolute time code has been recorded using a recording/playback device that has a recording section that does not have an absolute time code recording function. . Furthermore, if the user approves erasure of the absolute time code, after-recording of the start ID and program number can be performed. Furthermore, if you want to completely prevent erasure of absolute timecode,
It is also possible to prohibit after-recording regardless of the user's decision, and to display and notify the user that after-recording is not possible.

Furthermore, when after-recording is prohibited, it is possible to not only notify the user through a display, but also to use a method that is easy for the user to recognize, such as ejecting the cassette tape. Furthermore, in the actual 2i11 of the present invention, assuming a higher model that can record absolute time code, program number, and star ID and a lower model that cannot record program number and star 1-IDL, the tape created with the higher model is transferred to the lower model. The protection process for absolute time code when performing after-recording is explained, but the present invention
This is not limited to absolute time code protection processing, but protects information that can only be written on higher-end models from being erased by after-recording on lower-end models. For example, assuming a lower model that can only record from the start and a higher model that can record the start ID and program number, it is sufficient that the lower model has a program number erasure protection function.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a recording/reproducing apparatus in an embodiment of the present invention, FIG. 2 is a formant diagram showing the R-DAT track format, and FIG. 3 is a format diagram showing the subcode recording format. , Figure 4 shows Pa
ck 7 format, FIG. 5 is a format diagram showing the absolute time Pack format, FIG. 6 is a timing chart showing an example of sub ID and Pack recording, and FIG. 7 is the first conventional recording/playback device. 8 is a block diagram showing the configuration of a second conventional recording/reproducing device; FIG. 9 is a timing chart showing the timing of after-recording using the first conventional recording/reproducing device; FIG. 10 is a flowchart showing the flow of processing in the after-recording mode in the embodiment of the present invention. 1oo...Cylinder, 101a, 101b...
... Recording/playback head, 102 ... First type recording section, 103 ... Playback section, 104 ...
・Absolute time code detection unit, 105...recording control unit, 106...display unit, 107...
Control mode setting section. Name of agent: Patent attorney Toshio Nakao and 1 other person
4 Figure PCB, PCIIIBPC2ePC3ePC4ePC5
f! 1lPc6ePc7 Ce MOD2)
Figure 5 PCB=PCIe3PC2eBK31BPC4FBPC
5G3PC6tBPc7 (fB MOD2) Figure 7 '102 / Figure 8

Claims (2)

[Claims] (1) A recording means that is capable of recording information group A consisting of multiple or one type of information but not capable of recording information group B consisting of multiple or one type of information, and the above-mentioned information. a reproduction means capable of reproducing both group A and information group B; detection means for detecting that information belonging to the information group B is included in the information reproduced by the reproduction means; A recording/reproducing apparatus characterized by comprising a recording control means for controlling the recording means based on the detection result of the detection means. (2) A recording means that is capable of recording information group A consisting of multiple or one type of information, but not capable of recording information group B consisting of multiple or one type of information, and the above-mentioned information. a reproduction means capable of reproducing both group A and information group B; detection means for detecting that information belonging to the information group B is included in the information reproduced by the reproduction means; a display means for displaying the detection result of the detection means; a control mode setting means for instructing the operation mode of the recording control means; A recording/reproducing device characterized by comprising a recording control means for controlling a recording means.