JPH04206059A - Magnetic recording and reproducing apparatus - Google Patents

Abstract

PURPOSE:To make it possible to utilize a cassette tape efficiently by performing jumping to an allowed overwrite region with a jumping means when recording reaches a recorded region on which overwrite is inhibited during data recording. CONSTITUTION:In the case of recorded tape, whether a record inhibiting signal is written or not is discriminated. When the record inhibiting signal is detected, whether recording is ON or not is judged. When the recording is ON, a CTL- signal recording controller 7 instructs the temporary stop of the recording. At this time, a jumping controller 8 receives the value sent from a CTL-signal demodulating circuit 5, starts a winding-side-reel driving circuit 9 and starts the jumping in quick sending. Therefore, the record inhibiting signal is written in the data which are not to be erased, jumping is performed to a region wherein recording is not performed yet or to an allowed overwrite region and the recording can be restarted from that place. Thus, the efficient utilization of the cassette tape can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording and reproducing device equipped with a recording prohibition function that can be used in video tape recorders (hereinafter abbreviated as VTR), digital audio tape recorders, etc. It is related to.

Conventional technology In magnetic recording and reproducing devices that record and reproduce information on tape-shaped recording media, such as VTRs, the
Efforts have been made to prevent the information recorded on the tape from being accidentally erased.

FIG. 8 is a configuration diagram showing an example of a conventional magnetic recording/reproducing device equipped with a write inhibit function, in which 1 is a cassette tape, 2 is a tab attached to the back of the cassette tape 1, and 4 is a signal A controller for instructing recording; 3 a recording prohibition signal generation circuit for outputting a recording prohibition signal to the controller 4 depending on the presence or absence of the tab 2; 5 a keyboard for sending instructions to the VTR; 6 a TV tuner; and 7 In the video signal recording circuit, 8 is a recording head.

“O” indicates the signal potential is low, “O” indicates the signal potential is high.
If the claw 2 is not removed, the recording inhibit signal generating circuit 3 outputs a signal "0" that permits recording. In this case, when the record button on the keyboard 5 is pressed, the controller 4 sends a recording start signal to the video signal recording circuit 7, and the signal from the TV tuner 6 is sent to the video signal recording circuit 7 for recording. Recorded by 8. If you do not want to erase the information recorded on the cassette tape 1 by mistake, remove the tab 2 and the write inhibit signal generating circuit 3 will output a signal "1" to inhibit recording.

In this case, the controller 4 does not accept a recording instruction from the keyboard 5, and prevents new information from being overwritten on top of previously recorded information.

Problems to be Solved by the Invention However, with the above method, if information that does not want to be erased and information that can be erased are recorded on a single cassette tape, the information that does not want to be erased may be recorded. Therefore, even information that can be erased must remain as is, resulting in the problem that the cassette tape cannot be used efficiently.

The present invention solves the above-mentioned conventional problems, and provides a magnetic recording and reproducing device having a recording prohibition function that enables efficient use of a cassette tape that contains a mixture of information that does not want to be erased and information that does not want to be erased. The purpose is to

Means for Solving the Problems To achieve this object, the magnetic recording and reproducing apparatus of the present invention includes, as a first configuration, a magnetic head, a generating means for generating a write inhibit signal and outputting it to the magnetic head, and a a detection means for detecting a write inhibit signal from an output signal of a magnetic head; a switch means for determining an operation of the generation means and an operation of the detection means; and recording of a signal in the generation means based on an output of the detection means. and a skipping means for rapidly forwarding the tape in accordance with the output of the detection means.

A second configuration includes a magnetic head, an information identifying means for generating and determining information for identifying information to be recorded, and a signal superimposed with identifying information received from the information identifying means. a generating means for outputting to a magnetic head; a detecting means for detecting identification information from an output signal of the magnetic head and outputting it to the information identifying means; and a switch means for determining an operation of the generating means and an operation of the detecting means. , a controller for instructing the generating means to record a signal based on the output of the detecting means, and a skipping means for fast-forwarding the tape in response to the output of the detecting means.

Furthermore, as a third configuration, a magnetic head, a reproduction number setting means for outputting the number of reproduction times, a generating means for outputting a signal obtained by receiving the output of the reproduction number setting means and superimposing the reproduction number to the magnetic head, a detection means for detecting the number of reproductions from the output signal of the magnetic head and outputting it to the reproduction number setting means; a switch means for determining the operation of the generation means and the operation of the detection means; and a switch means for determining the operation of the generation means and the operation of the detection means; The apparatus includes a controller that instructs the generating means to record a signal, and a cueing means that receives the output of the detecting means and searches for the beginning of the recorded information.

Operation According to the first configuration of the present invention, the generation means writes a write prohibition signal to information that is not desired to be erased, and the detection means detects the write prohibition signal when overwriting the recorded area with information. By doing so, it becomes possible to determine whether or not to permit overwriting. Further, when recording information, when a recorded area where overwriting is prohibited is approached, the skipping means allows the skipping to an unrecorded area or an overwriting permitted area.

Further, the second configuration has a recording prohibition function like the first configuration, and also allows recording while skipping to an unrecorded area or an overwrite-permitted area using the skipping means. The information identification means makes it possible to recognize and reproduce information recorded in discontinuous areas as a series of information.

Furthermore, according to the third configuration, when the number of reproductions is specified by the reproduction number setting means when recording information, a recording prohibition function is activated and erasure by overwriting is prohibited until the specified number of reproductions is performed, and the number of reproductions is prohibited until the specified number of times is reproduced. After being played back, it is possible to stop the recording prohibition function.

Embodiment A magnetic recording/reproducing apparatus according to a first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a magnetic recording/reproducing apparatus according to a first embodiment of the present invention, in which a recording control signal (hereinafter, the control signal is abbreviated as a CTL signal) is generated from a vertical synchronization signal extraction circuit (not shown). ) is modulated by a CTL signal modulation circuit 3 that operates in response to a control signal from a switch 6a, and is transmitted to a tape (not shown) via a CTL signal recording amplifier 2 and a control head 1 as a CTL signal on which a recording prohibition signal is superimposed. ) is recorded.

On the other hand, the CTL signal reproduced by the control head 1 is amplified by the CTL signal reproduction amplifier 4, and the CTL signal is amplified by the CTL signal reproduction amplifier 4.
A CTL signal demodulation circuit 5 that operates according to a control signal from
sent to. The CTL signal demodulation circuit 5 detects a recording prohibition signal superimposed on the CTL signal from the signal output from the CTL signal reproduction amplifier 4, and supplies the output to a CTL signal recording controller 7 and an interlace controller 8. C.T.L.
The signal recording controller 7 receives the recording start signal and the output of the CTL signal demodulation circuit 5, and starts the CTL signal recording amplifier 2 if the output of the CTL signal demodulation circuit 5 is rLJ when the recording start signal becomes active. , otherwise the CTL signal recording amplifier 2 is stopped. The jump controller 8 controls the take-up reel motor 11 via the take-up reel drive circuit 9 in accordance with the output of the CTL signal demodulation circuit 5.
and controls the supply reel motor 12 via the take-up reel motor 11.

Further, in FIG. 1, a generation block 1oo is configured that generates a CTL signal on which a recording prohibition signal is superimposed from a CTL signal recording amplifier 2 and a CTL signal modulation circuit 3, and a CTL signal reproduction amplifier 4 and a CTL signal demodulation circuit 5. A detection block 20 detects a recording prohibition signal superimposed on the CTL signal from
0 is configured, a switch block 300 is configured from the switch circuit 6a and the switch circuit 6b, and a jump block 400 is configured from the jump controller 8, the take-up side reel drive circuit 9, and the supply side reel drive circuit 10.

FIG. 2 is a flowchart showing the operation when the apparatus shown in FIG. 1 records information, and during the recording operation, the process shown in FIG. 2 is repeatedly performed. The operation of the magnetic recording/reproducing apparatus of the first embodiment configured as described above will be described below with reference to FIGS. 1 and 2.

In addition, in the following explanation, the value of the control pulse is
This is achieved by switching the duty of the recording control pulse in two ways by the CTL signal modulation circuit 3 in FIG. 1, and during reproduction, the CTL signal demodulation circuit 5 The value of the control pulse can be read by

Further, a low potential signal is a "0" signal, and a high potential signal is a "1" signal.

Now, when the apparatus shown in FIG. 1 begins its operation and the process shown in FIG. 2 begins, branch 50.
Processing 51. In process 48, the switch circuit 6a is turned off.
If F, the CTL signal modulation circuit 3 is stopped, and if the switch circuit 6a is ON, the CTL signal modulation circuit 3 is activated, and the CTL signal on which the recording prohibition signal is superimposed is activated while the switch circuit 6a is ON.
Write the signal.

Specifically, the value of the normal control pulse is expressed as rO
J, the value of a control pulse with a different duty from normal is set to "1", and in order to prohibit overwriting,
It is assumed that a CTL signal is recorded using a pulse having a value of "1".

Next branch 52. Processing 53. In process 49, if the switch circuit 6b is ON, the CTL signal demodulation circuit 5 is activated, whereas if it is not, the CTL signal demodulation circuit 5 is not activated. Ignore and allow overwriting of that information.

In the branch 54, depending on whether a control pulse is detected within a certain period of time (for example, within 100 m5 eC, since control pulses are recorded every 33 m5 eC in a general VTR), it is determined whether the tape is unrecorded or recorded. It is determined whether the tape is a tape, and if it is a recorded tape, it is determined in branch 55 whether or not a write inhibit signal has been written. This can be determined by the fact that the value sent by the CTL signal demodulation circuit 5 is always "0" if no write inhibit signal is written, and is "1" otherwise.

When a recording prohibition signal is detected in this way, it is determined in branch 56 whether or not recording is in progress, and if recording is in progress, in process 57 the CTL signal recording controller 7 instructs to temporarily suspend recording. In process 58, the skip controller 8 receives the value "1" sent from the CTL signal demodulation circuit 5, activates the take-up reel drive circuit 9, and starts skipping by fast forwarding. If recording is not currently in progress, skip processing is in progress to an area where recording is possible, so the process continues.

If the record prohibition signal cannot be detected in the branch 55 or if it is determined that the area is an unrecorded area in the branch 54, it is determined in the branch 59 whether or not fast forwarding is in progress. If fast forwarding is in progress, the jump controller 8
receives the value rOJ sent out by the CTL signal demodulation circuit 5, stops the take-up reel drive circuit 9, starts the supply reel drive circuit 10, and stops fast forwarding. And processing 6
Recording starts at 1. If fast forwarding is not in progress, recording is in progress and the process continues.

As described above, according to the first embodiment, a magnetic head (control head 1), a generating means (generating block 100) that generates a write inhibit signal and outputs it to the magnetic head;
detection means (detection block 200) for detecting a write inhibit signal from the output signal of the magnetic head; switch means (switch block 300) for determining the operation of the generation means and the operation of the detection means; By providing a controller (CTL signal recording controller 7) that instructs the generating means to record a signal based on the output, and a jump means (jump block 400) that fast-forwards the tape according to the output of the detection means, It is now possible to write a record prohibition signal to information that you do not want to erase, and if you approach an area where a record prohibition signal is written when recording information, you can skip to an unrecorded area or an overwrite permitted area. You can then resume recording from that location.

Note that the CTL signal modulation circuit 3, the CTL signal demodulation circuit 5,
The switch circuits 6a and 6b1, the CTL signal recording controller 7, and the skipping controller 8 can be realized using a microcomputer, and the effects of the invention will not change.

Furthermore, the same effect can be obtained by setting the value of the normal CTL signal to "1" and setting the value of the CTL signal with a changed duty to "O".

Further, the CTL signal having a value of "O" is set as a recording prohibition signal, and the CTL signal recording controller 7 activates the CTL signal recording amplifier 2 when the output of the CTL signal demodulation circuit 5 is "1", and the skip controller 8 activates the CTL signal recording amplifier 2. When the output of the CTL signal demodulation circuit 5 is "0", fast forwarding is started, and the output is "1".
In this case, a method of ending fast forwarding may also be considered, and the present invention is not limited to this embodiment.

Next, a magnetic recording/reproducing apparatus according to a second embodiment of the present invention will be described with reference to the drawings.

FIG. 3 shows a block diagram of a magnetic recording and reproducing apparatus according to a second embodiment of the present invention, and the identification information generation circuit 15 recognizes information recorded in discontinuous areas as a series of information. 4-bit data is generated and sent to the recording shift register 13. The recording shift register 13 is a shift register that outputs 4-bit data, and uses a recording control signal generated from a vertical synchronization signal extraction circuit (not shown) as a clock signal in response to a control signal output from the switch circuit 6a, and performs identification. The CTL signal modulation circuit 3 is operated so that four consecutive control pulse trains having values corresponding to the data sent out from the information generation circuit 15 are generated. And C.T.L.
The output of the signal modulation circuit 3 is recorded on a tape via a CTL signal recording amplifier 2 and a control head 1.

On the other hand, the CTL signal reproduced by the control head 1 is amplified by the CTL signal reproduction amplifier 4 and sent to the CTL signal demodulation circuit 5. The reproduction shift register 14 outputs 4-bit data corresponding to a continuous control pulse train from the output of the CTL signal demodulation circuit 5 in accordance with the control signal output from the switch circuit 6b.

The memory 16 is used as the playback shift register 14 immediately after the start of playback.
It stores the data sent by , and always writes [0000
Remember 1. The comparison circuit 17 compares the data stored in the memory 16 and the data sent out by the playback shift register 14, and if they are equal, it outputs "0", otherwise it outputs "1".
is sent to the CTL signal recording controller 7 and the skip controller 8. The CTL signal recording controller 7 receives the recording start signal and the output of the comparison circuit 17, and activates the CTL signal recording amplifier 2 if the output of the comparison circuit 17 is rOJ when the recording start signal becomes active, and otherwise activates the CTL signal recording amplifier 2. In this case, stop the CTL signal recording amplifier. The jump controller 8 controls the take-up reel motor 11 via the take-up reel drive circuit 9 and the supply reel motor 12 via the take-up reel motor 11 in accordance with the output of the comparison circuit 17 .

Further, in FIG. 3, a generation block 500 that generates a CTL signal on which identification information is superimposed is configured from a CTL signal recording amplifier 2, a CTL signal modulation circuit 3, and a recording shift register 13, and a CTL signal reproducing amplifier 4 and a CTL signal A detection block 6oo that reads identification information superimposed on the CTL signal from the demodulation circuit 5 and the reproduction shift register 14 includes an identification information generation circuit 15, a memory 16, and a comparison circuit 17.
An information identification block 700 is constructed from the following.

FIG. 4 is a flowchart showing the operation of the apparatus shown in FIG. 3, and during operation, the process shown in FIG. 4 is repeatedly performed. The operation of the magnetic recording/reproducing apparatus of the second embodiment configured as described above will be explained below with reference to FIGS. 3 and 4. In the following explanation, the value of the control pulse is rOJ and This is the CTL signal modulation circuit 3 in FIG.
This is achieved by switching the duty of the recording control pulse in two ways.
The value of the control pulse can be read by the signal demodulation circuit 5.

Furthermore, by regarding the identification information as a recording prohibition signal, it is possible to prohibit overwriting of the information having the identification information.

Furthermore, a low potential signal is expressed as an rOJ signal, and a high potential signal is expressed as a "1" signal.

Now, when the apparatus shown in FIG. 3 starts its operation and the process shown in FIG. 4 is started, first in branch 70 it is determined whether the recording mode is the reproduction mode. In record mode, branch 71. Processing 72. In process 68, if the switch circuit 6a is OFF, the recording shift register 13 is stopped; if the switch circuit 6a is ON, the recording shift register 13 is activated, and the identification information sent by the identification information generation circuit 15 is processed while recording the information. CTL with superimposed
Write the signal.

As an example of a specific format, in order to recognize the beginning of the identification information, first, the value of the control pulse is set to "1" in four consecutive places, and then the combination of the values of the four control pulses [00011~ [11101 constitutes identification information, and these two types of control pulses are recorded alternately and repeatedly.

Next, branch 73. Processing 74. In process 69, if the switch circuit 6b is ON, the reproduction shift register 14 is activated, whereas if it is not, the reproduction shift register 14 is not activated, so the recording prohibition signal of the previously recorded information is ignored. , allowing overwriting of that information.

In the branch 75, depending on whether a control pulse is detected within a certain period of time (for example, within 100 m5 sec, since control pulses are recorded every 33 m sec in general VTRs), it is determined whether the tape is unrecorded or recorded. If the tape has already been recorded, the branch 76 compares the data sent from the memory 16 at the time of recording with the identification information sent from the playback shift register 14 in the comparison circuit 17. Determine whether a prohibition signal has been written. In other words, if no identification information is written, the data sent out by the reproduction shift register 14 is always [0000], so it matches the data sent out from the memory 16 during recording, but if identification information is written, it will not match. It can be determined by

When a recording prohibition signal based on identification information is detected in this way, it is determined in branch 77 whether or not recording is in progress, and if recording is in progress, in process 78 the CTL signal recording controller 7 instructs to temporarily suspend recording. In process 79, the jump controller 8 receives the value "1" sent from the comparator circuit 17.
”, the take-up reel drive circuit 9 is activated to start skipping by fast forwarding. If recording is not currently in progress, skip processing is in progress to an area where recording is possible, so the process continues.

If the recording prohibition signal cannot be detected in branch 76 or if it is determined that the area is unrecorded in branch 75, it is determined in branch 80 whether or not fast forwarding is in progress. In response to the value rLJ sent out by the comparison circuit 17, the take-up reel drive circuit 9 is stopped, and the supply reel drive circuit 10 is stopped.
Start to stop fast forwarding. Then, in process 82, recording is started. If it is not fast-forwarding, it is recording, so the process continues.

Further, when the playback mode is determined in branch 70, branch 83. In process 84, if the switch circuit 6b is ON, the reproduction shift register 14 is activated and the identification information superimposed on the CTL signal is read during reproduction, and if not, the reproduction shift register 14 is not activated and the identification information is ignored. playback in the order recorded on the tape.

Next, in branch 85, it is determined whether or not identification information has been written, and if it has not been written, the reproduction process continues. If identification information has been written, the identification information is read in process 86 and branch 87. In process 88, the read identification information is stored in the memory 16 if the reproduction has just started.

If it is not immediately after the start of playback, the comparison circuit 17 compares the identification information stored in the memory 16 with the identification information read in the process 86 in branch 89, and if they are not the same, it is determined in branch 90 whether or not playback is in progress. to decide.

If the playback is in progress, the playback is temporarily interrupted in process 91, and in process 92, the jump controller 8 receives the value "1" sent from the comparator circuit 17 and starts the take-up reel drive circuit 9, and performs fast forwarding. Start jumping. If the playback is not in progress, the skip process to the area where the stored identification information is written is in progress, so the process continues.

If it is determined in branch 89 that the identification information is the same, it is determined in branch 93 whether or not fast forwarding is in progress.

If fast forwarding is in progress, in step 94, the jump controller 8 receives the value "0" sent out by the comparison circuit 17, stops the take-up reel drive circuit 9, starts the supply reel drive circuit 10, and fast forwards. to stop. And processing 95
Start playback at . If it is not in fast-forward, it is in playback, so the process continues.

As described above, according to the second embodiment, the magnetic head (control head 1), the information identification means (information identification block 700) that generates and determines information for identifying information to be recorded, and generating means (generation block 500) for receiving the output of the identifying means and outputting a signal on which identifying information is superimposed to the magnetic head; and detecting means for detecting identifying information from the output signal of the magnetic head and outputting it to the information identifying means. (@output block 600), switch means (switch block 300) for determining the operation of the generating means and the operation of the detecting means, and commanding the generating means to record a signal based on the output of the detecting means. Controller (C
By providing a TL signal recording controller 7) and a skipping unit (skipping block 400) for fast forwarding the tape in accordance with the output of the detection unit, the recording prohibition function can be realized in the same manner as in the first embodiment. Recording can be performed while skipping to an unrecorded area or an overwrite permitted area, and moreover, during reproduction, information recorded in discontinuous areas can be recognized as a series of information and reproduced.

Note that the CTL signal modulation circuit 3, the CTL signal demodulation circuit 5,
Switch circuits 6a, 6b, CTL signal recording controller 7, skip controller 8, recording shift register 1
3, reproduction shift register 14, identification information generation circuit 15,
The memory 16 and comparison circuit 17 can also be realized using a microcomputer, and the effects of the invention will not change.

Further, the same effect can be obtained by setting the value of a normal CTL signal to "1" and setting the value of a CTL signal with a different duty from normal to "0".

In addition, the output data of the memory 16 and the playback shift register 1
If the output data of 4 and 4 are equal, the comparator circuit 17 outputs a value of "1", and if not, it outputs a value of "0". If the output of the comparator circuit 17 is "0", the CTL signal recording amplifier 2 is started, and if the output of the comparison circuit 17 is "0", the jump controller 8 starts fast forwarding, and if the output is "1", the fast forwarding is ended, etc. may also be considered, and is not limited to the examples.

Furthermore, a magnetic recording/reproducing apparatus according to a third embodiment of the present invention will be described with reference to the drawings.

FIG. 5 shows a block diagram of a magnetic recording/reproducing apparatus according to a third embodiment of the present invention. In FIG. 5, the playback count generation circuit 18 generates 4-bit data representing the number of playbacks before allowing recorded information to be overwritten with other information or erased. ,
A shift release signal that is sent to the recording shift register 13 immediately after the start of recording as reproduction number data. It is evening. The recording shift register 13 is a shift register that outputs 4-bit data, and immediately after the start of recording, the data sent out from the reproduction number generation circuit 18 is inputted, and immediately after the start of playback, the data sent out from the subtraction circuit 19 is inputted. Then, in accordance with the control signal output from the switch circuit 6a, a recording control signal generated from a vertical synchronization signal extraction circuit (not shown) is used as a clock signal, and a continuous four control pulse train having a value corresponding to the input data is generated. CT to be generated
The L signal modulation circuit 3 is operated. CTL signal modulation circuit 3
The output is recorded on tape via a CTL signal recording amplifier 2 and a control head 1.

On the other hand, the CTL signal reproduced by the control head 1 is amplified by the CTL signal reproduction amplifier 4 and sent to the CTL signal demodulation circuit 5. The reproduction shift register 14 transfers the 4-bit data corresponding to the continuous control pulse train from the output of the CTL signal demodulation circuit 5 to the CTL signal recording controller 7° and the subtraction circuit 19 in accordance with the control signal output from the switch circuit 6b. It is output to the cue controller 2o.

Cue processing is performed to search for the beginning of a series of information.
Immediately after playback is started, the subtraction circuit 19 decrements the playback count data recorded at the beginning of the information,
It is output to the recording shift register 13. When the cue controller 20 receives the playback number data output from the playback shift register 14, it reversely rotates the capstan motor 22 via the capstan drive circuit 21 to perform rewind processing to the beginning of the information.

The CTL signal recording controller 7' stops recording the CTL signal if the data sent from the playback shift register 14 following the cue signal during recording is a value other than [0OOOO; The CTL signal recording amplifier 2 is activated for a period of four cycles of the CTL signal, and the reproduction number data is updated with the data output from the subtraction circuit 19. The data output from the reproduction shift register 14 is [0
If it is OO1, after updating the playback count data to [0000, change all the values of the control pulse during playback to rO in order to allow overwriting after this playback ends.
Perform processing to rewrite to J.

In addition, in FIG. 5, the reproduction number generation circuit 18 and the subtraction circuit 19
A playback count setting block 800 is constituted by the playback count setting block 800, and a cueing block 900 is constituted by the cueing controller 20 and the capstan drive circuit 21.

6 and 7 are flowcharts showing the operation of the apparatus shown in FIG. 5. During the recording operation, the process shown in FIG. The processing shown in the figure is performed.

The operation of the magnetic recording/reproducing apparatus of the third embodiment configured as described above will be described below with reference to FIGS. 5, 6, and 7.

In addition, in the following explanation, the value of the control pulse is
This is achieved by switching the duty of the recording control pulse in two ways by the CTL signal modulation circuit 3 shown in FIG. 3, and during reproduction, the CTL signal demodulation circuit 5 The value of the control pulse can be read by

Also, the value of a normal control pulse is set to "0", and the value of a different control pulse is set to "1".
Assume that the CTL signal is recorded using a pulse having a value of "1" in order to prohibit overwriting.

Now, when the apparatus shown in FIG. 5 starts the recording operation and the process shown in FIG. 6 starts, first, the branch 110
If the switch circuit 6b is ON in step 111, the regeneration shift register 14 is operated.
If this is not the case, in order to stop the reproduction shift register 14 in step 112, the recording prohibition signal of the previously recorded information is ignored and overwriting of that information is permitted.

After processing 111, in branch 113, the control pulse is
Since it is recorded every m5ec, for example, 100m5
Within ec. ), it is determined whether the tape is an unrecorded tape or a recorded tape, and if the tape is a recorded tape, it is determined in branch 114 whether or not a write inhibit signal has been written. This is because the control pulse output from the control demodulation circuit 5 always has a value of "1" if the write inhibit signal is written, so the data sent out by the recording shift register 14 is always [1].
It can be determined by seeing 111 pieces. If a recording prohibition signal is detected, in step 115, the CTL signal recording controller 7'' instructs to stop recording.

If the record inhibit signal cannot be detected in the branch 114, if it is determined that the area is an unrecorded area in the branch 113, or after the playback shift register stop processing in the process 112, the branch 116. Processing 117. In process 118, if the switch circuit 6a is ON, the recording shift register 13 is activated, and if it is OFF, the recording shift register 13 is stopped. After processing 117, branch 1
19. Processing 120. If it is determined in process 121 that recording has just started, the reproduction number data sent by the reproduction number generation circuit 18 is recorded, and thereafter a recording prohibition signal is superimposed on the CTL signal and recorded.

As an example of a specific recording format of playback number data, [10101 is written as a cue signal at the beginning of the recorded information, then 4-bit data sent from the playback number generation circuit 18 is written, and from then on, Always “1”
'' is superimposed on the CTL signal and recorded as a recording prohibition signal. [The reason why 1010 is selected as the cue signal is that if the information recorded before the recorded information has a record prohibition signal, the data sent out from the playback shift register 14 immediately before the cue signal is detected. This is because it can be distinguished from both because it is [1111 ko and otherwise it is coooo ko.

On the other hand, after the cueing process of the information to be reproduced is performed, the apparatus shown in FIG. 5 starts the playback operation, and when the process shown in FIG. Subsequently, the recorded reproduction number data is read, and in step 123, the cue controller 20 reversely rotates the capstan motor 22 via the capstan drive circuit 21 to rewind the tape. brunch 124
Then, the data sent out by the reproduction shift register 14 is [0
If it is 1011, it is assumed that the cue signal was detected from the opposite direction, and rewinding is stopped. Note that if the data read in process 122 is [10101, which is the same as the cue signal, the first [0101] detected while rewinding.
1 can be easily determined to mean that the reproduction number data was detected from the opposite direction, so it will not be mistakenly recognized as a cue signal.

After cueing is completed, playback is restarted, and in branch 126, if it is determined that the data read in step 122 is other than [0001] on the CTL signal recording controller surface, step 127. In process 128, the subtraction circuit 19 decrements the reproduction number data and outputs new reproduction number data to the recording shift register 13 immediately after detecting the cue signal. Then, the CTL signal immediately after receiving the signal recording controller file output signal [10101
The reproduction count data is updated by activating the CTL signal recording amplifier 2 for a period of four signal cycles.

In branch 126, if the data read in process 122 is [0001], after the playback count data is updated to [0000] in process 130, in order to allow overwriting after the end of this playback, In step 131, reproduction is started while all values of subsequent control pulses are rewritten to rOJ.

As described above, according to the third embodiment, the magnetic head (control head 1), the number of reproductions setting means (the number of reproductions setting block 800) that outputs the number of times of reproduction, and the number of reproductions setting means that receives the output of the number of reproductions setting means. Generating means (generating block 50
0), a detection means (detection block 600) that detects the number of reproductions from the output signal of the magnetic head and outputs it to the number of reproductions setting means, and a switch means that determines the operation of the generation means and the operation of the detection means. (switch block 30
0), a controller that instructs the generating means to record a signal based on the output of the detecting means (on the CTL signal signal recording controller, a cueing controller that searches for the beginning of the information recorded in response to the output of the detecting means); By providing means (cueing program 900), the recording prohibition function can be realized in the same way as in the first embodiment, and by specifying the number of reproductions by the reproduction number setting means when recording information,
The recording prohibition function operates to prohibit erasure by overwriting until the specified number of reproductions, and it is possible to stop the recording prohibition function after the specified number of reproductions.

Note that the CTL signal modulation circuit 3, the CTL signal demodulation circuit 5,
The switch circuits 6a and 6b1, the CTL signal recording controller 7', the recording shift register 13, the reproduction shift register 14, the reproduction number generation circuit 18, the subtraction circuit 19, and the cueing controller 20 can also be realized using a microcomputer, and the invention There is no change in the effect of

Further, the same effect can be obtained by setting the value of a normal CTL signal to "1" and setting the value of a CTL signal with a different duty from normal to "0".

In addition, the control pulse having a value of "0" is used as a recording prohibition signal, and the CTL signal recording controller 7' is
A similar effect can be obtained even if the CTL signal recording amplifier 2 is stopped when the signal oo is received.

Furthermore, it is also possible to invert all "0" and "1", place an adder circuit in place of the subtractor circuit 19, and increment the data sent from the reproduction shift register. It's not a thing.

Effects of the Invention As described above, according to the first embodiment of the present invention, there are provided a generating means for generating a recording inhibit signal, a detecting means for detecting the recording inhibit signal, and a switch means for controlling the generating means and the detecting means. By providing a controller that controls the start of recording based on the output of the detection means and a skipping means that fast-forwards the tape in response to the output of the detection means, it is possible to write a recording prohibition signal to information that is not to be erased. In addition, when recording information, if an area where a write prohibition signal is written is reached, it is possible to jump to an unrecorded area or an overwrite permitted area and resume recording from that location. .

Further, according to the second embodiment, there is a generating means for generating identification information, a detecting means for detecting the identifying information, a switch means for controlling the generating means and the detecting means, and a recording start based on the output of the detecting means. The first embodiment is achieved by providing a controller for controlling the tape, a skipping means for fast-forwarding the tape in accordance with the output of the detection means, and an information identification means for recording identification information during recording and discriminating identification information during playback. As in the example, it is possible to record while skipping to unrecorded areas or overwrite-permitted areas, and at the time of playback, information recorded in discontinuous areas is recognized as continuous information and played back. This has great practical effects.

Further, according to the third embodiment, a generating means for generating a recording prohibition signal, a reproduction number setting means for outputting data on the number of times of reproduction to the generating means, a detecting means for detecting the recording prohibition signal, and a generating means. By providing a switch means for controlling the detecting means, a controller for controlling the start of recording based on the output of the detecting means, and a cueing means for searching the beginning of the recorded information, the number of playbacks can be determined when recording the information. When you specify the number of playbacks using the setting means, the recording prohibition function works and prohibits erasure by overwriting until the specified number of plays is performed, and after the specified number of plays, the recording prohibition function is stopped. This has great practical effects.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram of a magnetic recording/reproducing apparatus according to a first embodiment of the present invention, FIG. 2 is a flowchart for explaining the operation of the same embodiment, and FIG. 3 is a block diagram of a magnetic recording/reproducing apparatus according to a first embodiment of the present invention. FIG. 4 is a flowchart for explaining the operation of the second embodiment of the present invention, and FIG. 5 is a block diagram of the magnetic recording and reproducing device according to the third embodiment of the present invention. 6 and 7 are flowcharts for explaining the operation of the same embodiment, and FIG. 8 is a block diagram of a conventional magnetic recording/reproducing apparatus having a write inhibit function. 100... Generation block, 200... Detection block, 300... Switch block, 400
... Jump block, 500 ... Occurrence block, 600 ... Detection block, 700 ... Information identification block, 800 ... Play count setting block, 900 ... Cue block. Name of agent: Patent attorney Akira Okaji and two others IDO-
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Claims (3)

[Claims] (1) A magnetic head, a generating means for generating a write inhibit signal and outputting it to the magnetic head, a detecting means for detecting the write inhibit signal from an output signal of the magnetic head, an operation of the generating means, and an operation of the detecting means. a controller for instructing the generating means to record a signal based on the output of the detecting means; and a skipping means for rapidly forwarding the tape in accordance with the output of the detecting means. Recording and playback device. (2) A magnetic head, an information identification means for generating and determining information for identifying information to be recorded, and a generator for receiving the output of the information identification means and outputting a signal on which identification information is superimposed to the magnetic head. means, a detecting means for detecting identification information from an output signal of the magnetic head and outputting it to the information identifying means, a switch means for determining an operation of the generating means and an operation of the detecting means, and an output of the detecting means. A magnetic recording and reproducing apparatus comprising: a controller that instructs the generating means to record a signal based on the output of the detecting means; and a skipping means that fast-forwards the tape in response to the output of the detecting means. (3) a magnetic head; a reproduction number setting means for outputting the number of reproductions; a generating means for receiving the output of the reproduction number setting means and outputting a signal on which the reproduction number is superimposed to the magnetic head; and an output of the magnetic head. a detection means for detecting the number of reproductions from the signal and outputting it to the reproduction number setting means; a switch means for determining the operation of the generation means and the operation of the detection means; A magnetic recording/reproducing apparatus comprising: a controller for instructing recording of a signal; and a cueing means for receiving an output from the detecting means and searching for the beginning of recorded information.