JP3761801B2 - Recording medium playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording medium playback apparatus that receives control of recording and playback operations by an external control apparatus, and more particularly to a recording medium playback apparatus that is optimal for incorporation into a commercial broadcasting system.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a professional video playback system used for broadcasting business, a plurality of magnetic tape recording / playback devices arranged in parallel, and a control device for controlling the entire system including playback operations of each magnetic tape recording / playback device, There is a thing comprised by.
[0003]
In the conventional business video playback system configured as described above, the playback start position is searched as follows. That is, first, information for designating the reproduction start position (hereinafter referred to as a STOP code) is written in advance in the user bit area of each magnetic tape. The writing of the STOP code may be performed on the magnetic tape in an external device such as a video camera or an editing device, or the control device constituting this system may be performed on the magnetic tape via the magnetic recording / reproducing device.
[0004]
After writing the STOP code as described above, each magnetic tape recording / reproducing device detects the STOP code writing position in the preparation stage at the time of reproduction, and stops the magnetic recording tape at the detected position to start reproduction. Perform a location search. The search may be performed while reproducing the magnetic recording tape, or may be performed while performing fast forward and rewind operations.
[0005]
During playback, a search operation for matching the tape reading position to the playback start position is performed in the preparation stage. Therefore, if playback is performed as it is, playback starts from a preset playback start position. Can do.
[0006]
In the business video playback system configured as described above, the search for the STOP code is performed in the control device. That is, first, the control device outputs a STOP code search command to the magnetic tape recording / reproducing device. The magnetic tape recording / reproducing apparatus performs reproduction, fast forward, and rewinding operations of the magnetic recording tape in accordance with instructions from the control device, and outputs the user bit area information read by this operation to the control device. The control device searches for the STOP code from the input user bit area information. When the STOP code is detected, the control device outputs a search stop command to the magnetic tape recording / reproducing device. In the magnetic tape recording / reproducing apparatus, when a search stop command is received, the search operation (operation for reading information in the user bit area by reproduction, fast forward, or rewind operation of the magnetic recording tape) is stopped. Thereby, in the magnetic tape, the tape position (reproduction start position) where the STOP code is recorded coincides with the head reading position. For this reason, if the reproduction operation of the magnetic tape is started in this state, the reproduction is executed from a preset reproduction start position.
[0007]
[Problems to be solved by the invention]
As described above, the STOP code is detected and the playback start position is searched. However, in the professional video playback system, even if a failure occurs in the system, the minimum necessary for video playback is required. As long as the function can be exhibited, that is, the magnetic tape recording / reproducing apparatus can perform the reproducing operation of the magnetic tape, the business (broadcasting, etc.) must be performed.
[0008]
Here, in order to carry out business, a search operation of the magnetic tape is required regardless of the urgency. However, since the search operation is executed mainly by the control device as described above, if any failure occurs in the control device, the playback function of the magnetic tape recording / playback device is hindered. Even in such a state, it is impossible to search for the reproduction start position.
[0009]
For these reasons, there has been a demand for enabling the search operation of the reproduction start position by the recording medium reproducing apparatus alone even if some trouble occurs in the control apparatus. A main object of the present invention is to provide a recording medium reproducing apparatus capable of performing a search operation of position selection information by the apparatus alone.
[0010]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention is a recording medium playback device that receives control of the recording / playback operation by a control device provided outside,
Search means for searching for whether or not the position selection information on the medium is included in the read information while reading the information written in the user bit area of the recording medium made of a magnetic recording tape ;
Stop means for stopping the search for the magnetic recording tape at the information position of the magnetic recording tape that has confirmed the position selection information;
The magnetic recording tape position selection information writing position when the stop means stops the search operation, or the contact position between the magnetic recording tape and the read head of the recording medium playback apparatus that is implemented after the search operation is stopped is delicately set. Detection means for detecting a positional deviation between the position selection information writing position that moves relative to the tape reading position of the recording medium reproducing apparatus and the tape reading position of the recording medium reproducing apparatus by the moving process When,
Notification means for notifying the outside of the detection result by the detection means;
It is characterized by having.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention is a recording medium playback apparatus that receives control of the recording / playback operation by an external control device,
Search means for searching for whether or not the position selection information on the medium is included in the read information while reading the information written in the user bit area of the recording medium made of a magnetic recording tape ;
Stop means for stopping the search for the magnetic recording tape at the information position of the magnetic recording tape that has confirmed the position selection information;
The magnetic recording tape position selection information writing position when the stop means stops the search operation, or the contact position between the magnetic recording tape and the read head of the recording medium playback apparatus that is implemented after the search operation is stopped is delicately set. Detection means for detecting a positional deviation between the position selection information writing position that moves relative to the tape reading position of the recording medium reproducing apparatus and the tape reading position of the recording medium reproducing apparatus by the moving process When,
Notification means for notifying the outside of the detection result by the detection means;
This has the following effects.
[0012]
That is, it is possible to search for position selection information only by the recording medium playback device.
[0016]
Also , in a recording medium reproducing apparatus using a magnetic recording tape, a positional deviation between the tape reading position of the recording medium reproducing apparatus and the actual position selection information writing position when the stop means stops the search operation. May occur. Furthermore, there is the following processing as one of various operations performed after the search operation is stopped. That is, in a recording medium reproducing apparatus using a magnetic recording tape, in order to prevent the tape from being worn by contact between the magnetic recording tape and the reproducing head (rotating) in the standby state, A process of slightly moving the contact position of the reproducing head is performed. When such various operations are performed, a relatively large positional deviation may occur between the position selection information writing position and the tape reading position.
[0017]
Therefore, in the present invention, such a positional deviation is detected by the detecting means, and the detection result by the detecting means is notified to the outside, that is, the operator. As a result, the operator can grasp the deviation amount and accurately adjust the position selection information writing position with respect to the head contact position of the magnetic recording tape.
[0021]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a magnetic recording tape recording / reproducing apparatus as an example of a recording medium reproducing apparatus of the present invention, and FIG. 2 is a block diagram showing a configuration of a main part (control unit) of this apparatus. is there.
[0022]
This magnetic recording tape recording / reproducing apparatus is incorporated in, for example, a commercial video reproducing system, and sends and receives various control signals to and from a control apparatus A provided outside, whereby the basic operation is performed by the control apparatus A. An apparatus to be controlled, which includes a recording system circuit, a reproduction system circuit, and a control signal recording / reproduction system circuit.
[0023]
The recording circuit includes a video input terminal 20 and an interface 15 to which video data is input from the outside, a video signal recording processing circuit 12 that converts input video information input via the interface 15 into a recording signal, and a recording signal. And a recording head 2 for writing a recording signal to the magnetic recording tape 1.
[0024]
The reproduction system circuit outputs a reproduction head 3 that reads a reproduction signal from the magnetic recording tape 1, a reproduction head amplifier 7 that amplifies the electric signal read from the reproduction head 3, and a reproduction signal amplified by the reproduction head amplifier 7. It has a video signal reproduction processing circuit 13 for converting to video data, an interface 16 for outputting output video data to the outside, and a video output terminal 21.
[0025]
The control signal recording / reproducing system circuit includes a TC head 4 for recording / reproducing a time code signal to / from the magnetic recording tape 1, a CTL head 5 for recording / reproducing a control signal to / from the magnetic recording tape 1, and a time code signal. A TC recording / reproduction processing circuit 8 for performing the signal processing, a CTL recording / reproduction processing circuit 9 for performing signal processing of the control signal, a control unit 14 for controlling the entire apparatus in addition to the control of the time code signal and the control signal, have.
[0026]
Further, the magnetic recording tape recording / reproducing apparatus includes a drive system (including a pinch roller) 10 for conveying the magnetic recording tape 1, a servo circuit 11 for controlling the drive system 10, an operation command switch 17, a control device A, and the like. A control signal input / output terminal 18 for transmitting and receiving various control signals to and from the external device, and a display unit 19 are provided. The drive command switch 17 and the display unit 19 are provided on the front operation surface of the magnetic recording / reproducing apparatus.
[0027]
As shown in FIG. 2, the control unit 14 includes a STOP code presence / absence determination unit 30, a time difference calculation unit 31, a TC (time code) memory 32, a CTL (control signal) memory 33, an operation control unit 34, And a drive control unit 35. The STOP code presence / absence determining unit 30 determines whether or not a STOP code is written in the user bit area (provided in the time code signal writing area) of the read magnetic recording tape 1. The TC memory 32 is a memory for recording a time code value written at a position on the magnetic recording tape 1 where a STOP code is written. The CTL memory 33 is a memory for recording a control signal written at a position (control track) on the magnetic recording tape 1 where a STOP code is written. The operation control unit 34 controls the operation of the operation command switch 17 and the display unit 19. The drive control unit 35 controls the drive system 10 via the servo circuit 11.
[0028]
Hereinafter, the characteristic operation of the magnetic recording tape recording / reproducing apparatus will be described with reference to the flowchart of FIG. Here, the reproduction start position search operation, which is a feature of the present invention, will be described.
[0029]
The search operation for the reproduction start position is the following operation. That is, a STOP code that is position selection information and designates a reproduction start position is recorded in the user bit area of the magnetic recording tape 1 in advance, and the recording position of the STOP code is searched and magnetic recording is performed at the search position. An operation for stopping the feeding operation of the tape 1 and fixing the winding position. The STOP code is recorded in the magnetic recording tape 1 in a state in which it is associated with video data by a separate video camera or editing device in advance when recording or editing shooting data on the magnetic recording tape 1. It is recorded in the user bit area (set in the time code signal recording area).
[0030]
Returning to the description of the flowchart of FIG. 3, the operation control unit 34 first determines in advance whether the cassette of the magnetic recording tape 1 is loaded in the magnetic recording tape recording / reproducing apparatus (S301). If it is determined in S301 that a cassette is loaded, the operation control unit 34 next determines whether or not the STOP code search mode is set. The STOP code search mode is set when the operator operates the operation command switch 17 corresponding to the mode, and the setting state is stored in a storage unit (not shown) in the operation control unit 34.
[0031]
Upon confirming the setting of the STOP code search mode, the operation control unit 34 determines whether a STOP code search operation has been started (S302). The STOP code search operation is started when the operation control unit 34 confirms that the operator has operated the operation command switch 17. Specifically, the STOP code search operation is performed as follows.
[0032]
The drive system 10 is driven in a state where at least the TC head 4 and the CTL head 5 are in contact with the magnetic recording tape 1, whereby the time code signal and the control signal are transmitted from the magnetic recording tape 1 while performing the tape feeding operation. read. Reading of the time code signal and the control signal can be performed as follows.
[0033]
The TC head 4 and the CTL head 5 may be selectively brought into contact with the magnetic recording tape 1 to selectively read the time code signal and the control signal. Ordinary reproduction operation, fast forward reproduction, rewind reproduction (reproduction) Even if the time code signal and the control signal are read from the magnetic recording tape 1 while the head 3, the TC head 4 and the CTL head 5 are brought into contact with the magnetic recording tape 1 and the information on the magnetic recording tape 1 is read) Good.
[0034]
When it is confirmed that the search is started in S303, the STOP code presence / absence determining unit 30 monitors whether or not a STOP code is detected by the search (S304). The monitoring operation here is performed by repeatedly searching for a user bit area in the time code signal and confirming whether or not a STOP code is entered therein.
[0035]
While the STOP code is not detected in S304, the process proceeds to S311 where it is determined whether the STOP code has been detected first. Since the STOP code is not detected at the beginning of the search, in S311, it is determined that the STOP code has not been detected, and the process proceeds to S312.
[0036]
In S312, it is determined whether or not the magnetic recording tape 1 to be searched has reached the end of the tape. This determination is made by the operation control unit 34. If it is determined in S312 that the tape end has not been reached, the process returns to S304 and the STOP code search operation is continued. The operations of S304, S311, and S312 are continuously performed until it is detected in S304 that the STOP code has been detected or until the end of the tape is detected in S312.
[0037]
In S312, when the operation control unit 34 confirms that the magnetic recording tape 1 has reached the end of the tape, the operation control unit 34 determines that the STOP code exists in the searched tape area, and the STOP code is stored. A display command for displaying information (text information or image information) indicating that it has not been detected is transmitted to the display unit 19. As a result, the display unit 19 notifies the operator that the STOP code has not been detected by displaying text data or the like (S313), and then ends the series of search operations. At this time, the STOP code non-detection information is output to the control device A or the like via the control signal input / output terminal 18.
[0038]
On the other hand, when the STOP code presence / absence determination unit 30 confirms that the STOP code has been detected in S304, information indicating that is transmitted to the operation control unit 34. The operation control unit 34 that has received the STOP code detection information transmits a display command of information (text information or image information) indicating that the STOP code has been detected to the display unit 19. Accordingly, the display unit 19 notifies the operator that the STOP code has been detected by displaying text data or the like (S305). At this time, the STOP code detection information is output to the outside via the control signal input / output terminal 18 toward the control device A or the like.
[0039]
Further, in S304, when it is confirmed that the STOP code is detected, the control signal and the time code signal read simultaneously at the time of detection are stored in the CTL memory 33 and the TC memory 32, respectively. In step S306, the search and the tape feeding operation are temporarily stopped (S307). At this time, each information of the control signal and the time code signal at the time of detecting the STOP code is outputted to the outside via the control signal input / output terminal 18 to the control device A or the like.
[0040]
In S307, after the search and tape feeding operations are temporarily stopped, this time, the time difference between the tape position of the magnetic recording tape 1 with which the reproducing head 3 is currently in contact and the tape position when the STOP code is detected. Is calculated by the time difference calculation unit 31 (S308).
[0041]
The tape position of the magnetic recording tape 1 in contact with the reproducing head 3 at present can be recognized by reading the time code signal and the control signal with the TC head 4 and the CTL head 5. Further, the time difference can be calculated by comparing the time code signals and the control signals.
[0042]
In order to calculate the time difference in this way, the following information is input to the time difference calculation unit 31. That is, the time code signal or control signal read from the magnetic recording tape 1 by the TC head 4 or the CTL head 5 at the tape position where the reproducing head 3 is in contact with the current position is the TC recording / reproducing processing circuit 8 or the CTL recording / reproducing processing circuit. 9 is input to the time difference calculation unit 31. Further, the time code signal and the control signal at the time of detecting the STOP code are read from the TC memory 32 and the CTL memory 33 and input to the time difference calculation unit 31.
[0043]
In S <b> 308, the time difference calculation unit 31 that has calculated the time difference transmits the time difference to the operation control unit 34. At this time, the time code at the time of detecting the STOP code is input from the TC memory 32 to the operation control unit 34 at the same time. The operation control unit 34 instructs the display unit 19 to display a time difference (a time difference between the tape position currently in contact with the reproducing head 3 and the tape position at the time of detecting the STOP code) and a time code at the time of detecting the STOP code. Output. Upon receiving this display command, the display unit 19 displays the time difference and the time code at the time of detecting the STOP code, and notifies the operator (S309).
[0044]
The operator can understand the time code at the time of detecting the STOP code by visually observing the display carried out at S309, and also the tape position that is currently in contact with the reproducing head 3 and the time code at the time of detecting the STOP code. The time difference from the tape position can also be understood. The reason for calculating and displaying such a time difference is as follows.
[0045]
When searching for a STOP code while feeding the tape at high speed, such as fast-forward playback, there may be a slight time lag between the STOP code detection timing and the tape feed stop timing. In that case, there is a possibility that the position of the tape part in contact with the reproducing head 3 and the tape part in which the STOP code is written are shifted after the tape feeding is stopped. In view of this, in the present embodiment, the time difference between the tape position that is currently in contact with the reproducing head 3 and the tape position at the time of detecting the STOP code is calculated and displayed. To announce. As a result, the operator can recognize the positional deviation and perform processing for correcting the positional deviation.
[0046]
At this time, the time difference information and the time code at the time of detecting the STOP code described above are output to the outside via the control signal input / output terminal 18 to the control device A or the like.
[0047]
After performing the display operation of S309, the operation control unit 34, after completing the STOP code search, waits for the tape loading mechanism (each head remains in contact with the magnetic recording tape 1 so that the next operation can be started immediately). Mode in which the state of the circuit is maintained in the standby state) is set, or the series of operations are completed and the head is detached from the magnetic recording tape 1, and the operation of the tape loading mechanism and the circuit is completed. It is confirmed whether or not the state has been changed (S310). The standby mode is set by an operation of the operation command switch 17 by an operator, and is recorded in a storage unit (not shown) of the operation control unit 34.
[0048]
In S310, when the operation control unit 34 confirms that the standby mode has not been set, a series of search operations are terminated because the detection of the STOP code is terminated.
[0049]
On the other hand, when the operation control unit 34 confirms that the standby mode is set in S310, the process returns to S304. In this case, since no STOP code is detected in S304, the process proceeds to S311. Further, in this case, since it is determined in S311 that the STOP code has been detected first, the process proceeds to S308, S309, and S310, and the display of the time code at the STOP code detection position is continued. In addition, the above-described time difference information update operation is performed.
[0050]
The above-described time difference update operation is performed for the following reason. That is, in the magnetic recording tape recording medium reproducing apparatus, the standby mode is set in order to prevent the tape from being worn by contact between the magnetic recording tape 1 and the reproducing head 3 (rotating) in the standby state. , A process of slightly moving the contact position between the magnetic recording tape 1 and the reproducing head 3 is performed. In the case of shifting to the standby mode after performing the above-described search operation, if a small movement operation of the tape is performed, a relatively large position shift is caused between the STOP code detection position and the tape position contacting the reproducing head 3. May occur.
[0051]
Therefore, in this embodiment, such a positional deviation is detected by the time difference calculation unit 31, and the positional deviation information is updated and displayed on the display unit 19 to notify the operator. Thus, the operator can grasp the amount of deviation in real time and accurately adjust the detection position of the STOP code with respect to the reproducing head 3.
[0052]
The processing from S304 to S310 and S311 includes the notification of the time code at the detection position of the STOP code, the notification of the time difference between the detection position of the STOP code and the tape contact position of the reproducing head 3, and the update operation of these notifications. This is performed until it is confirmed in S310 that the standby mode has ended. The updated time difference information is also output to the outside via the control signal input / output terminal 18 toward the control device A and the like.
[0053]
In the embodiment described above, the STOP code presence / absence determination unit 30 constitutes the search means in the claims, the operation control unit 34 and the drive control unit 35 constitute the stop means in the claims, and the time difference calculation unit 31 charges. The detection means in the section is configured.
[0054]
Further, STOP code detecting RiTsuge known means by the display unit 19 to carry out the display operation of the notification information is composed in S305. Further, STOP code detection notice information and the operation control unit 34 performs an operation for outputting to the outside the same information as the control signal output terminal 18 and the I Ride force means to be displayed is formed in S305.
[0055]
The display unit 19 performs the display operation (display of the time code at the STOP code detection position and display of the time difference between the tape position currently in contact with the reproducing head 3 and the STOP code detection position) performed in S309. The notification means in the claims is configured as described above. Further, the operation control unit 34 that performs an operation of outputting information similar to the time code and the time difference notification information displayed in S309 to the outside and the control signal input / output terminal 18 constitute output means in the claims .
[0056]
Also, tell known means, composed of a display unit 19 for displaying the non-detection information of STOP code in S313. Output means is constituted by an operation control unit 34 for outputting the same information as STOP undetected information display operation on the external control signal input terminal 18 in S313.
[0057]
In the embodiment described above, the present invention is implemented in the magnetic recording tape recording / reproducing apparatus. However, the present invention is not limited to such a recording medium reproducing apparatus, and any recording medium (hard disk, DVD, etc.). Needless to say, the present invention can also be implemented in a reproducing apparatus using the above.
[0058]
【The invention's effect】
As described above, according to the present invention, even if some trouble occurs in an external control device, it is possible to search for position selection information such as a playback start position by a recording medium playback device alone, The usability of the recording medium playback device has improved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a magnetic recording tape recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a main part (control unit) of the magnetic recording tape recording / reproducing apparatus according to the embodiment.
FIG. 3 is a flowchart showing the operation of the magnetic recording tape recording / reproducing apparatus according to the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Magnetic recording tape 2 Recording head 3 Reproducing head 4 TC head 5 CTL head 6 Recording head amplifier 7 Reproducing head amplifier 8 TC recording / reproducing processing circuit 9 CTL recording / reproducing processing circuit 10 Drive system 11 Servo circuit 12 Video signal recording processing circuit 13 Video Signal reproduction processing circuit 14 Control unit 15 Interface 16 Interface 17 Operation command switch 18 Control signal input / output terminal 19 Display unit 20 Video input terminal 21 Video output terminal 30 STOP code presence / absence determination unit 31 Time difference calculation unit 32 TC memory 33 CTL memory 34 Operation Control unit 35 Drive control unit A Control device

Claims (2)

A recording medium playback device that receives control of the recording / playback operation by a control device provided outside,
Search means for searching for whether or not the position selection information on the medium is included in the read information while reading the information written in the user bit area of the recording medium made of a magnetic recording tape ;
Stop means for stopping the search for the magnetic recording tape at the information position of the magnetic recording tape that has confirmed the position selection information;
The magnetic recording tape position selection information writing position when the stop means stops the search operation, or the contact position between the magnetic recording tape and the read head of the recording medium playback apparatus that is implemented after the search operation is stopped is delicately set. Detection means for detecting a positional deviation between the position selection information writing position that moves relative to the tape reading position of the recording medium reproducing apparatus and the tape reading position of the recording medium reproducing apparatus by the moving process When,
Notification means for notifying the outside of the detection result by the detection means;
A recording medium reproducing apparatus comprising: The recording medium playback apparatus according to claim 1,
A recording medium reproducing apparatus comprising output means for outputting information indicating a detection result by the detection means to the outside .

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