JPS634481A - Data recording method for vtr - Google Patents

Abstract

PURPOSE:To obtain a data recoding method for a VTR with improved operability and usage by providing re-number function re-numbering automatically. CONSTITUTION:A tape is rewound up to the start point and a start number and an increment are inputted to a microcomputer by applying re-numbering. Then the VRT is brought to the fast feeding mode and when the initial address data is detected, the running of the magnetic tape is stopped. Then the VTR is rewound and when the reproduction data inputted at the rewinding mode is to be detected as address data, the rewinding mode is released and the VTR is brought to the normal reproduction mode. Then the microcomputer detects a header of the initial address data starting the program search reproduction and the value of the start address fetched in 16-bits shown in address information data parts 52-1-52-3 from the detecting point of time is recorded again. Thus, the header part of the recorded number data remains as it is and only the part of address information data is replaced and the deviation of the recording position of the address data from the original recording position at the re-recording is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a data recording method for a VTR, and particularly for a VTR (
The present invention relates to a method for recording data on a magnetic tape, such as positional information and arbitrary comment information, on a magnetic tape on which video and audio signals are recorded and played back using a magnetic recording/playback device.

Prior art The present applicant has filed Japanese Patent Application No. 61-66159 (name of invention r
The duty cycle of the control pulse is varied and recorded on the control track using data related to the position information of the magnetic tape used in the home VTR, arbitrary comment information, etc. We have proposed a VTR data recording and reproducing device that is configured to reproduce and display this data as well as to allow random access.

According to this proposed VTR data recording and reproducing device,
Since multiple types of data are selected and recorded and played back on the control track, it can be constructed at a lower cost than a VTR that records and plays back SMPTE time code, and is also similar to Utility Model Publication No. 57-34633. Compared to the conventional VTR described above, it has excellent features such as being able to freely record any information with extremely simple operations, allowing random access, and being able to be used in a wide variety of ways.

Problems to be Solved by the Invention However, since each piece of data recorded on the control track by the above-mentioned proposed device is not related to each other, for example, even though the values of address data should be recorded in order, Even if the order is recorded too soon, the address data itself will be recorded without any problem. When random access is performed by reproducing the address code from such a recorded magnetic tape, the relative positional relationship is detected by comparing the target address and the address based on the reproduced address data, the access direction is determined, and the access is performed. If this is done, there is a problem that access may take time due to the above-mentioned error in the recording address order, or in extreme cases, access may not be possible.

Additionally, it may be necessary to record two new address data between the recorded edge address data of the control track of the recorded magnetic tape. In such a case, the recorded edge address data is recorded one by one from the beginning. It had to be rewritten, and the operation was extremely complicated and inconvenient to use.

The present invention was created in view of the above points, and by providing automatic renumbering and numbering functions,
The object of the present invention is to provide a VTR data recording method that improves operability and usability.

Means for Solving the Problems The VTR data recording method of the present invention appropriately selects a plurality of types of data, such as position information on electrical tape and comments on recorded information contents, and records the data at a fixed period according to the value of the selected data. This is a method of recording on a control track by varying the duty cycle of the control pulse of the magnetic tape, and is a method for renumbering address data so that the values of edge address data recorded in an arbitrary section on a magnetic tape are in order. This allows re-recording.

The values of the recorded edge address data recorded on the action control track are not necessarily in order, but the values of the recorded edge address data in any section on the magnetic tape are automatically set in order. Data is rerecorded. This will automatically renumber them.

Embodiment FIG. 1 shows a flowchart of an embodiment of the method of the present invention. This flowchart shows the 1 in the VTR 11 shown in FIG.
This is carried out by a chip microcomputer (microcomputer) 12. The overall configuration of a data recording/reproducing apparatus to which the method of the present invention is applied is shown in FIG. To explain this data recording and reproducing device, as will be described later, the VTR 11 includes a 1-chip microcomputer 12, a read/write circuit 13. Character generator 1
4, etc., and the display panel has a normal V
In addition to the display Ei 515 similar to the TR, a data recording/reproducing operation section 16 and a character output on/off switch 17 are added, and a keyboard 18 is further connected. The VTR 11 is also provided with a lid 19 that opens and closes when a tape cassette is inserted or removed, like a normal VTR.

Further, the VTRII outputs the reproduced output video signal and audio signal, and the data to be recorded and reproduced, to the monitor television 21 via the cable 20.

The comment on-screen switch 28 in the data recording/playback operation section 16 is a switch for switching the display on the screen 29 of the monitor television 21, and can be turned on (ON) or off (OF).
It is connected to one of the three switch switching positions of F) and scroll (SCROLL),
When it is in the rONJ position, the letters rKEY INJ and "
In addition to displaying the characters TAPE 0UTJ, on the right side of the same line as the character display rKEY INJ, display the 10-character key manual display and the 10-character comment played from the control track as described later.
This display mode will be displayed on the right side of the same line as the character display for TAPE OIJ rJ. This display mode is hereinafter referred to as "2-line display mode".
).

Also, the comment on-screen switch 28 is turned OFF.
When in position J, no characters are displayed, and rsc
When in the ROLLJ position, 10 per line is displayed within the range 22 surrounded by the two-dot chain line on the screen 29 of the monitor television 21.
A total of nine lines of characters are displayed (this display mode is hereinafter referred to as "scroll display mode"). In this scroll display mode, display in the two-line display mode is not performed.

Further, a renumber switch 23 is provided in the data recording/reproducing operation unit 16, and by pressing this, a re-recording mode for renumbering address codes according to the present invention is entered as described later.

Next, the configuration and operation of the main parts of the VTR 11 will be explained in the third section.
This will be explained along with the block system diagram shown in the figure.

In FIG. 3, the same components as those in FIG. 2 are given the same reference numerals. In this embodiment, there are four types of data that can be recorded, and the configuration is such that only one of the negative types can be selected using the switch SW +.
DDREssJ, rcOMENTJ and rlNDEXJ
When a low level signal is applied to the input port indicated by , the recording mode for special function data, address data, character data, and index signals is entered. Here, the index signal is a signal in which a -fixed value is repeated a fixed number of times, and is used for relative cue playback. In the recording mode, the microcomputer 12 determines the data to be recorded based on the signal from the switch SW+, and performs predetermined data as shown in FIGS. 4(A) to (C) according to the data to be recorded from the keyboard 18 etc. Generate and output data in the format.

Here, FIG. 4(A) shows a signal format of one embodiment of address data. In the figure, 51-1 to 51-4 are 11-bit headers, for example, the most significant bit (MSB)
) and the two least significant bits (LSB) are rOJ
This is a fixed pattern signal in which the values of the remaining 9 bits from the second bit to the tenth bit are each "1". Following the headers 51-1 to 51-3, 4-bit×4-digit address information data 52-1 to 52-3 are arranged.

Each of the address information data 52-1 to 52-3 is "1,000",
B with 4 bits for each digit of “100 J, r+J and “-”
This is data for a total of 16 pits expressed in CD code. Of these, the 4 bits of the most significant "thousand" digit are located in the 4 bits immediately after headers 51-1 to 51-3, and their value can be any value from "0" to "9". , and never takes a value from "10" to N5J in decimal notation (that is, rAJ to "F" in hexadecimal notation).

By detecting that the value of these 4 bits immediately after the header indicated by 51-1 to 51-3 etc. is neither the hexadecimal value rAJ nor rBJ of the identification signal described later, in the reproduction system, It is possible to identify that the reproduced data is address information data.

This address information data can be any address entered from the keyboard, such as rolooJ, r0175j, r0210.
Even if it is random data such as J, r1500J, r2000J, fixed address information that has continuity from the beginning of the tape (for example, roloJ, ro020J, r
o030J,...) may also be used.

In this way, the address data is recorded and reproduced in 27-bit units consisting of an 11-bit header and 16-bit address information data in a time-series manner.

Next, FIG. 4(B) shows the signal format of an example of character (:'') comment data. In the same figure, 53-1 and 5
3-2 are headers each having an 11-bit fixed pattern, the values of which are the same as those of the headers 51-1 to 51-4 shown in FIG. 4 (Δ). The 4 bits immediately before and the 4 bits immediately after the header 53-2 contain an identification signal 54-2.54, each having a hexadecimal value of l'AJ, as shown by AH.
-3 is placed in the header 53-1, etc.).

This identification signal allows the reproduction system to identify that the reproduced data is character data.

The 4 bits immediately after the header 53-1 contain the above identification signal 5.
4-1 is placed, and after that a total of 10 each 6 is placed.
Bit character information data Do to D9 and a 4-bit identification signal 54-2 are sequentially arranged. Each of the above character information data Do to D9 can be converted into 6 bits by using only a part of the ASCII code (for example, 59 characters from the space SP to the uppercase 2).
It is compressed into bits, making the bit rate smaller than the existing ASCII code.

The identification signal is placed not only immediately after the headers 53-1 to 53-2, etc., but also in the immediately preceding four bits, as shown in 54-2, because this character data has a bit This is to make the reproduction system immediately recognize that the data is character data not only during fast forwarding but also during rewinding since the rate is high.

In this way, character data consists of an 11-bit header, two 4-bit identification signals, and 60 bits (=6 bits x 10).
The information is recorded and reproduced in 79-bit units, which are composed of character information data, in chronological order.

Next, FIG. 4(C) shows a signal format of an example of special feature data. In the figure, headers 55-1 to 55-4 are headers 51-1 to 51 shown in FIGS. 4(A) and (8).
-3.53-1.53-2, respectively, and are 11-bit fixed pattern signals. header 55
4-bit identification signals 56-1 to 56-4 whose hexadecimal value is rBJ are arranged in the 4 bits immediately after -1 to 55-4, respectively, as shown by BH. Identification signal 5
The next 12 bits from 6-1 to 56-3 contain special function information data 57-1 to 57-1, which consists of 3 digits of 4-bit BCD code.
57-3 is placed. The above identification signals 56-1 to 56
-4 allows the reproduction system to identify that this data is special function data. This special function data is the end of recording.

This data indicates the start of skip, the end of skip, the beginning position of the video signal, etc.

In this way, the special function data consists of an 11-bit header and a 4-bit header.
The data is recorded and reproduced in 27-bit units, which are composed of a bit identification signal and 12-bit special function information data, and are synthesized in chronological order.

Returning to FIG. 3 again, if the microcomputer 12 determines that the signal to be recorded is an index signal, the microcomputer 12 immediately releases the signal, and if it determines that the signal to be recorded is address data, the microcomputer 12 inputs the input signal from the keyboard 18 or the operation 8IS 16. After storing the numerical address data from the character key in the data memory (RAM), when it is determined that the VTR is in the playback mode, it is determined whether or not the comment replacement key 27 has been pressed. This comment change key 27 is pressed by the user at the time when Nee+1- puts the VTR in playback mode and detects the leading device at the location where data is to be recorded by monitoring the playback image on the monitor television 21.

When the microcomputer 12 detects that the comment change key 27 has been pressed, the microcomputer 12 synchronizes the phase with the reference pulse of the reproduction control pulse and changes the duty cycle of the control pulse one bit at a time according to the format of the recording data. The old circuit 13 is caused to perform the operation of varying the value, and continues in this state until the recorded data is completed.

Next, the data recording operation performed in this reproduction mode will be explained with reference to FIG. 3 and FIGS. 5(A) to 5(F). The recorded magnetic tape on which data is to be recorded is stored in a tape cassette and loaded into the VTR 11.
During normal playback, the magnetic tape is pulled out from the cassette and loaded onto a predetermined tape path (loading state) where it is wound diagonally over a predetermined angle range around a rotating body equipped with a rotating head, and the capstan and pinch It is held by rollers and made to run, and as it runs, the third
The control pulse reproduced by the control head 34 shown in the figure is used as a reference signal for the phase control system of the head servo circuit to keep the rotational phase of the rotary head constant, or as a reference signal for the phase control system of the head servo circuit to keep the rotational phase of the rotary head constant, or as a reference signal for the phase control system of the head servo circuit to keep the rotational phase of the capstan constant. It is well known that this signal is used as a comparison signal for the phase υ1121I system of the stun servo circuit.

Here, while the control pulse during recording is a square wave, the reproduction control pulse is differentiated according to the differential characteristics of the head, and becomes a positive pulse at the rising edge of the recording square wave, and a negative polarity pulse at the falling edge. The waveform shown by a in FIG. Not used in

In this case, the recorded magnetic tape is played back, and the positive polarity control pulse (this is referred to as the "reference pulse" in the water book) used for the servo circuit is normally supplied. Since it is necessary to perform recording while performing servo operation while varying the duty cycle of the control pulse according to the recorded data, re-recording (erasing) is prohibited during the reference pulse reproduction period and some period before and after it. ,
In addition, in order to erase the section between adjacent reference pulses and re-record (rewrite) a signal such that the reproduction control pulse has negative polarity, the microcomputer 12 performs the process shown in FIG.
Pulse b shown in B) is applied to the switch circuit 33 as a switching pulse, and is turned on only during its high level period.

At the same time, the microcomputer 12 also outputs the output port RE.
CC'l'' L1 to the recording control circuit 31 in Figure 5 (
As shown in C), the pulse b rises at the rising edge of the pulse b, and a period corresponding to the value of each bit of the data to be recorded has elapsed (however, this period is smaller than the high level period of the pulse b). It generates and outputs a pulse C that falls at the falling edge of the pulse C, and outputs it from the output port RECCTL2 to the recording υ control circuit 31, as shown in FIG. 5(D). A pulse d is generated and outputted so that it falls just before the falling edge of the pulse b so that the negative polarity pulse of the pulse d can be erased.

Pulses C and d are supplied to the recording control circuit 31. Drive amplifier 3
2. The signals are supplied to the control head 34 through the switch circuits 33, respectively, and the signals shown in FIG.
) A recording current e as shown in FIG. Recording current e is pulse C
flows in the positive direction during the high level period of , and the high level of pulse d! ! ] 13 flows in the negative direction, but does not flow during the period when pulses C and d are both low level and during the low level period of pulse b when the switch circuit 33 is off.

As a result, the reference pulse of the reproduction control pulse a remains unchanged, the negative polarity pulse is erased by the positive or negative recording current e, and the negative polarity pulse is erased at the time when the recording current e changes from the positive direction to the negative direction. A new record will be created. This operation is repeated until recording of all bits of recording data is completed. When the recorded magnetic tape recorded in this manner is subsequently reproduced, the reproduction control pulse waveform becomes as shown in FIG. 5(F).

This reproduction control pulse has a period of one frame,
Moreover, the reference pulse position is the same as before, but the duty cycle is such that 1 bit of the recorded data is "1".
When , it becomes the first value, and 1 bit of the recorded data is "0"
When , it becomes the second value, and when no data is recorded, it becomes the third value between them. Therefore, 27-bit address data is recorded over 27 frames. Further, the same data value is repeatedly recorded three times in a predetermined signal format.

Note that when a low level signal is applied to the input port INDEX by the data select switch SW Become.

Note that data recording can also be performed in the VTR recording mode. In this case, for example, the pulse width of the recording control pulse, which is a square wave of 1 frame + yJ, is modulated according to recording data and recorded. Note that even in this recording mode, it is possible to easily record VTR data after waiting for the change key 27 to be pressed by changing the software of the microcomputer 12. .

Next, the operation of address renumbering that fits the present invention will be explained. To set the address code values in the signal format shown in FIG. 4(A) recorded on the control track of the recorded magnetic tape in order, the user presses the renumber switch 23 shown in FIG. . As a result, as shown in FIG.
The microcomputer 12 sequentially performs operations according to the flowchart shown in FIG.

That is, first, the microcomputer 12 uses a magnetic tape (not shown).
A control signal for rewinding the tape is sent to cause the tape to be rewound to the beginning (step S+). Next, the user operates the keyboard 18 shown in FIGS. 2 and 3 to enter the start address and increment (difference between the new address and the next address) for renumbering. The microcomputer 12 takes these in (step 82 in FIG. 1).

The microcomputer 12 then sends out a control signal to put the VTR in fast forward mode (step 33>). Here, in the fast forward mode described above and the rewind mode described later, the recorded magnetic tape remains stored in the tape cassette. Since the control head 34 shown in FIG. 3 cannot reproduce control pulses, the control head 34 shown in FIG. 3 cannot reproduce control pulses.

However, in this fast forward or rewind mode, the M
Since the R head 39 is disposed in a sliding manner, the control pulse is reproduced by the MR head 39 and supplied to a Schmitt trigger circuit 41 through an amplifier 40 shown in FIG.

The Schmitt trigger circuit 41 generates a pulse h as shown in FIG. 6<8), which rises when a positive polarity pulse of the reproduction control pulse 9 as shown in FIG. 6(A) arrives and falls when a negative polarity pulse arrives. This pulse h is transmitted to the switch circuit 3 connected to the terminal UNLOAD side by a switching signal from the terminal 38 during fast forward and rewind modes.
It outputs to the microcomputer 12 through 7. - On the other hand, each timing generator 42 rises at the timing of the duty cycle between the maximum duty cycle and the minimum duty cycle of the reproduction control pulse 9, as shown in FIG. 6(C), and also at the timing of the reference pulse. A timing pulse i is generated so as to fall at .

The microcomputer 12 latches the pulse h at the rising edge of the timing pulse i, as shown in FIG. 6(D).
After capturing the detection data as shown in , it is formatted by hardware or software, the written data is read out, and when the same value occurs two or more times in a row, it is determined as a true value by the character generator 14. The adder circuit 43 outputs the signal through the output terminal 45 and displays it on the monitor television 21. Substantially the same operation is performed in the scroll display mode (at this time, the switch circuit 28b in FIG. 3 is on).

Among the various data read in this way and input to the microcomputer 12, the microcomputer 124 determines that the value of the next 4 bits of the header of the common pattern is I.
Based on the fact that 'AJ and rBJ are not the same, it is detected whether or not the first address data has been read (step Ss in FIG. 1). If the first address data is detected, the microcomputer 12 stops the running of the magnetic tape (step Ss). Until then, the magnetic tape had been running at high speed in the instep feed mode, so the tape stop operation in step S5 did not stop the magnetic tape immediately, but caused it to overrun beyond the first address data detection position. Stop at a position.

Next, the microcomputer 12 sends out a control signal to put the VTR into rewind mode, and upon detecting that the playback data input during the rewind mode is the address data mentioned above, cancels the rewind mode (search). and generates and outputs a control signal that sets the VTR to normal playback needs (step S
s). As a result, the first detected and reproduced address data starts to be cued and reproduced from its initial position.

After that, the microcomputer 12 detects the header of the first address data at which cue playback was started (step S7), and from the time of detection, the address information data part (52 in FIG. 4(A)) is detected.
-1.52-2.52-3)), the value of the start address taken in step S2 is re-recorded (step Sa).

This re-recording is performed in the same manner as the data recording operation in the reproduction mode described with reference to FIGS. 5(A) to 5(F). Therefore, the header part of the recorded address data remains as it was, and only the address information data part is rewritten. Thereby, it is possible to prevent the recording position of the address data from shifting from the original recording position during re-recording.

Next, the microcomputer 12 determines whether the renumbering process has been completed (step Ss). This judgment is made, for example, when the stop button is pressed, when the magnetic tape reaches the end of the tape, or when the total number of addresses to be renumbered is taken in step S2, when the total number is reached. This is done based on various information such as:

If the renumbering is not completed, the microcomputer 12 returns to step $3 and skips forwarding the tape again. Thereafter, the microcomputer 12 sequentially performs the processing operations of steps 84 to S9 described above. As a result, the address information data of the second address data is updated to a new address obtained by adding one increment to the start address.

Thereafter, the processing operations of steps 83 to S9 described above are repeated until the renumbering operation is completed, and then the microcomputer 12 stops the magnetic tape (step 5ho). In this way, the value of the address information data is sequentially rewritten from the beginning of the tape to an address that starts from an arbitrary start address and increases step by step by an arbitrary increment.

In the above embodiment, it was explained that renumbering is performed from the beginning of the tape, but the present invention is not limited to this, and by changing the software of the microcomputer 12, the address data value of the desired section can be changed. can be re-recorded in the desired order. For example, the address data values on the magnetic tape are 0.1.2, 3, 4, 5.6.7,
If 8.9 are recorded in order, numbers 7 and after are 6.
If you want to change the address to, for example, 10.20.30 for reasons such as recording a new video signal that is completely different from the one before the address, fast forward the magnetic tape to the address data recording position of address 7, and then It is also possible to renumber the address data of addresses 8 and 9. In this case, since the section for renumbering is shorter than renumbering from the beginning of the tape, there is an advantage that the recording time can be shortened.

By applying the present invention, for example, the operation from detecting address data to cueing is the same as the present invention, but if the operation is repeated for a few seconds after that, it is possible to improve the ski By rewriting all the data in the section including the length of the written data to "0" pulses (long duty cycle pulses) after starting the address data. , data can be deleted.

Effects of the Invention As described above, according to the present invention, the address data values of a desired section can be sequentially changed by the simple operation of pressing the renumber switch and inputting the start address, increment, etc. by operating the keyboard. It is extremely easy to use because it can be automatically re-recorded, and the address data recorded in this way is always in order and the size relationship is maintained, so random access based on the address data is possible. In this case, even if random access is made from the middle of the magnetic tape, the access direction (tape running direction) can be determined immediately by simply comparing the size of the address data reproduced at the beginning and the target address data. This method does not require complicated operations such as detecting the relative positional relationship of address data one by one, and has the advantage of shortening the access time.

[Brief explanation of drawings]

FIG. 1 shows a flowchart 1! showing an embodiment of the present invention. - Fig. 2 is an overall configuration diagram of an example of a recording/reproducing head that can realize the present invention, Fig. 3 is a block system diagram of an example of the main parts in Fig. 5 and 6 are signal waveform diagrams for explaining the operation of the block system shown in FIG. 3, respectively, showing examples of signal formats of data to be recorded and reproduced. 11...VTR, 12...Microcomputer (
microcomputer), 13...read/write circuit, 14...character generator, 18...keyboard, 21...
・Monitor TV, 23...Renumber switch, 24
...Renumber instruction signal input terminal, 34...Control head. Patent applicant: Victor Japan Co., Ltd. Figure 1 Figure 5 Ichishiran Figure 6 - Ichigagawa Do Uta

Claims (1)

[Claims] A plurality of types of data such as positional information on a magnetic tape on which video signals are recorded and played back by a VTR and comments on recorded information contents are appropriately selected, and a control pulse of a constant period is generated according to the value of the selected data. A data recording method for a VTR in which data is recorded on a control track of the magnetic tape by varying the duty cycle of the magnetic tape, the method comprising: recording position information on the magnetic tape in an arbitrary section on the magnetic tape among the plurality of types of data; A data recording method for a VTR, characterized in that address data is re-recorded for renumbering so that the values of the address data are in order.