JPH05314408A - Magnetic recorder/reproducer - Google Patents

Abstract

(57) [Abstract] [Purpose] An object is to obtain a magnetic recording / reproducing apparatus capable of finishing the performance determination of the magnetic tape in a short time to start the recording operation and performing the signal recording processing according to the performance of the magnetic tape. And When the performance of the magnetic tape 12 is judged, a video signal is recorded for a short time on the rotating magnetic heads 5a and 5b on the magnetic tape 12 which is not running, and the recorded video signal is magnetic tape which is not running. A system controller 11A which reads out from the recording medium 12 and reproduces it, and discriminates the performance of the magnetic tape from the reproduction level, a memory 16 which stores the discrimination result, and a frequency characteristic of a video signal which is recorded based on the discrimination result. The recording FM equalizer 3 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus for controlling video signal recording and video signal reproduction in accordance with the performance discrimination result of a magnetic recording medium, particularly a magnetic tape, in magnetic recording / reproduction.

[0002]

2. Description of the Related Art FIG. 10 is a block diagram showing the structure of a conventional magnetic recording / reproducing apparatus. In the figure, 1 is a recording signal processing circuit for processing a video signal to be recorded on a magnetic tape described later (hereinafter, simply referred to as a recording video signal) for magnetic recording, and 2 is a recording processed by the recording signal processing circuit 1. An FM modulator for FM-modulating a video signal, a recording FM equalizer 3 for changing the frequency characteristic of an FM-modulated recording video signal according to the performance of a magnetic tape described later, 4 a rotary video head 5a in a rotary drum 5, 5b is a mode switch for switching the recording mode and the reproduction mode of the signal, and the recording video signal from the recording FM equalizer 3 is output to one of the rotary video heads 5a and 5b in the rotary drum 5 through the mode switch 4.

Reference numeral 6 is a head signal amplifier for amplifying the recording video signal read from the rotary video heads 5a and 5b through the mode switch 4, and 7 is an FM-modulated recording video signal, which is a recording video signal of the original frequency. Return reproduction FM
An equalizer, 8 is an FM demodulator for demodulating the FM-modulated recording video signal, 9 is a reproduction signal processing circuit for reproducing the demodulated recording video signal into an image display signal, and 10 is a tape to be described later taken out from the head signal amplifier 6. It is a reproducing FM detector that detects the discrimination signal and performs DC conversion.

Reference numeral 11 is a system controller for controlling the magnetic recording / reproducing apparatus in a centralized manner. The system controller 11 discriminates the performance of the magnetic tape 12 from the DC output level taken out from the reproducing FM detector 10, and records the recorded video signal in the recording FM equalizer 3. The frequency characteristic is changed, and the frequency characteristic of the reproduction FM equalizer 7 is changed. Further, the system controller 11 outputs a control signal to the capstan servo circuit 13 that controls the running of the magnetic tape 12, and
A control signal is output to the drum servo circuit 14 that controls the rotation of the rotary drum 5. 15 is the system controller 11
It is a tape discriminating signal generator for outputting a tape discriminating signal 15S in accordance with a control signal received from the device.

Next, the operation of the conventional magnetic recording / reproducing apparatus having the above structure will be described with reference to the flowchart of FIG. When the system controller 11 receives a command received from the user, that is, a command to judge the performance of the magnetic tape 12 to be used and to enter the recording mode based on the result of the performance judgment, the performance of the magnetic tape 12 is as follows. Enter the discrimination operation. First, the system controller 11 sends the tape discrimination signal 15S to the tape discrimination signal generator 15.
To the recording FM equalizer 3, and then the capstan servo circuit 13 and the drum servo circuit 14 are output.
To set the normal recording mode. According to this recording mode, the tape discriminating signal 15S is recorded for 5 seconds on one track (both L azimuth and R azimuth) of the magnetic tape 12 via the mode switch 4 which is turned to the recording mode (a) side by the user. (Step S1).

After this 5 seconds, the magnetic tape 12 is first rewound (step S2), and the system controller 11
Is a capstan servo circuit 13 and a drum servo circuit 1
4 is read out by the rotary video heads 5a and 5b to record the tape discrimination signal 15S recorded in the normal reproduction mode, and is sent to the head signal amplifier 6 through the mode switch 4 which is turned to the reproduction side (b) by the user. .. The head signal amplifier 6 sufficiently amplifies the tape discriminating signal 15S and sends it to the reproducing FM detector 10, where it is DC converted.

DC-converted tape discrimination signal 15SD
Is sent to the system controller 11, and the performance of the magnetic tape 12 is determined based on the level of this signal. After the performance determination result is stored in the system controller 11,
If the magnetic tape has a high performance, the recording FM equalizer 3 is controlled so that the frequency characteristic at the time of recording the recording video signal is increased, and if the magnetic tape has a low performance, the recording FM equalizer 3 is controlled so that the frequency characteristic becomes a normal level (step). S3, S4).
If the frequency characteristic of the recording FM equalizer 3 is controlled, the magnetic tape 12 is rewound to the beginning, then put into a stand-in state for normal recording, and recording of a recording video signal is actually started (step S5). S6).

Next, as the signal processing in the reproduction mode of the recorded video signal, the system controller 11 divides the discriminated performance of the magnetic tape 12 into several ranks and switches the frequency characteristic of the reproduction FM equalizer 7 according to the rank. .. In accordance with the frequency characteristic, the reproduction FM equalizer 7 reproduces the recorded video signal and sends it to the FM demodulator 8 in the next stage to obtain the original recorded video signal, which is then sent to the reproduction signal processing circuit 9 for reproduction processing. Output video signal.

[0009]

Since the conventional magnetic recording / reproducing apparatus is constructed as described above, a magnetic tape for 5 seconds is used to judge the performance of the magnetic tape before recording the recorded video signal on the magnetic tape. After running and recording the tape discriminating signal, it is necessary to rewind the magnetic tape for the running amount and reproduce the signal for 5 seconds, which is not possible when the user urgently wants to record the video signal. There was a point.

Further, since the system controller divides the performance of the magnetic tape into several stages for each rank and determines the frequency characteristic to be set for the reproduction FM equalizer for each rank, satisfactory signal reproduction processing according to the magnetic tape performance can be achieved. There was a problem that it could not be implemented. Furthermore, the operation is unified in the signal processing in the reproduction mode, and the same reproduction processing is performed even during special reproduction such as temporary stop, double speed feed, or slow feed of the magnetic tape. There was a problem that there was no proof that satisfactory image quality could be obtained.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to finish the performance determination of the magnetic tape in a short time to start the recording operation and to respond to each tape reproduction operation mode. An object of the present invention is to obtain a magnetic recording / reproducing device capable of performing signal reproduction processing.

[0012]

According to another aspect of the present invention, there is provided a magnetic recording / reproducing apparatus which records a video signal for a short time on a magnetic recording medium whose traveling is stopped and then records the recorded video signal while the traveling is stopped. A performance discriminating means for reading out from the magnetic recording medium and reproducing it, thereby discriminating the performance of the magnetic recording medium, a storing means for storing the performance discriminating result by the performance discriminating means, and a video recording based on the performance discriminating result. And signal processing means for controlling the signal processing operation of the signal.

According to another aspect of the magnetic recording / reproducing apparatus of the present invention, a video signal is recorded for a short time on a magnetic recording medium whose running is stopped, and then the recorded video signal is read from the magnetic recording medium whose running is stopped. A reproduction signal for controlling the operations of the performance discriminating means for reproducing the magnetic recording medium and for discriminating the performance of the magnetic recording medium and the operation of the reproducing system circuit for reproducing the read video signal according to the result of the performance discrimination of the magnetic recording medium. And processing means.

In the magnetic recording / reproducing apparatus according to the third aspect of the present invention, the magnetic recording medium is rewound for a certain period of time, and at the same time, the video signal is recorded at the time of rewinding, and the recorded video signal is magnetically recorded. It is provided with a performance discriminating means for reading out from the medium and reproducing it, thereby discriminating the performance of the magnetic recording medium, and a signal processing means for controlling the signal processing operation of the video signal to be recorded based on the performance discrimination result. is there.

According to another aspect of the magnetic recording / reproducing apparatus of the present invention, a video signal is recorded for a short time on a magnetic recording medium that is not running, and then the recorded video signal is read from the magnetic recording medium that is not running. The performance determination means for performing the playback and thus determining the performance of the magnetic recording medium, and the operation of the playback system circuit for playing back the read video signal, the performance determination result of the magnetic recording medium, and the operation of the magnetic recording medium. And a reproduction signal processing means for controlling the special reproduction operation.

According to another aspect of the magnetic recording / reproducing apparatus of the present invention, signal recording means for recording a video signal after winding the magnetic recording medium for a certain period of time and reading the recorded video signal from the magnetic recording medium. It is provided with a performance discriminating means for reproducing and thereby discriminating the performance of the magnetic recording medium, and a signal processing means for controlling a signal processing operation of a video signal to be recorded based on the performance discrimination result.

According to a sixth aspect of the present invention, there is provided a magnetic recording / reproducing apparatus which records a video signal on the magnetic recording medium which is not running for a short time by using only one of the azimuth heads when the performance of the magnetic recording medium is judged. A performance discriminating means for reading out a video signal from the magnetic recording medium by the recorded azimuth head and reproducing the video signal, thereby discriminating the performance of the magnetic recording medium, a storage means for storing the performance discriminating result, and the performance discriminating result. Signal processing means for controlling the signal processing operation of the video signal recorded on the magnetic recording medium based on the above.

[0018]

In the magnetic recording / reproducing apparatus according to the invention of claim 1,
The performance determination signal of the magnetic recording medium can be recorded on the magnetic recording medium and the performance determination signal can be reproduced from the magnetic recording medium without running the magnetic recording medium.

According to the second aspect of the present invention, the reproduction signal processing means controls the noise canceling operation for the reproduction video signal based on the size of the reproduction video signal according to the performance of the magnetic recording medium.

In the magnetic recording / reproducing apparatus according to the invention of claim 3, the signal for discriminating the magnetic recording medium performance recorded by the signal recording means at the time of rewinding the magnetic recording medium before the usual signal recording is recorded in a short time before the signal recording. By the reproduction by the performance discriminating means, the time from the performance discrimination of the magnetic recording medium to the video signal recording is shortened.

The magnetic recording / reproducing apparatus according to the invention of claim 4 controls the reproduction processing operation of the signal in accordance with the performance of the magnetic recording medium and the special reproduction operation of the magnetic recording medium such as double speed feeding and temporary stop.

In the magnetic recording / reproducing apparatus according to the invention of claim 5, the tape is wound for a short time before the performance of the magnetic recording medium is determined, and the tape performance determination signal is recorded while the running of the tape is stopped. By reproducing this signal for performance discrimination, the floating of the tape due to the looseness of the magnetic recording medium can be eliminated, and the recording and reproduction of the performance discrimination signal can be performed with certainty.

According to another aspect of the present invention, there is provided a magnetic recording / reproducing apparatus which records a performance discriminating signal on a magnetic recording medium by using only one azimuth head and uses the same azimuth head during signal reproduction. To improve the recording and reproducing efficiency of the signal for reading, and to perform the recording and reproducing using the same azimuth head, the waveform of the performance determining signal becomes stable.

[0024]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a magnetic recording / reproducing apparatus according to this embodiment. In the figure, the same parts as in FIG. 10 indicate the same or corresponding parts. Reference numeral 11A is a system controller in the present embodiment, 16 is a memory for storing the performance determination result of the magnetic tape 12 by the system controller 11A,
Reference numeral 5c is a head switch for switching the rotary video heads 5a and 5b by the control operation of the system controller 11A. The system controller 11A constitutes a performance discriminating means and a signal processing means, and the memory 6 and the storage means are equivalent.

Next, the operation of this embodiment shown in FIG. 1 will be described with reference to FIG.
A description will be given according to the flowchart in FIG. Before recording the recorded video signal, the system controller 11A determines the performance of the magnetic tape 12 to be used by the user and receives a command to enter the recording mode based on the performance determination result. The performance determination operation starts. First, the mode switch 4 is set to the recording side (a), and the FM-modulated recording video signal output from the recording FM equalizer 3 is passed through the mode switch 4 to the rotary video head 5.
a and 5b, and a recording video signal is output to one field (both R azimuth and L azimuth) of the magnetic tape 12 by 0.5.
Seconds are recorded (step S7). At this time, the system controller 11A controls the capstan servo circuit 13 and the drum servo circuit 14 to rotate the rotating drum 5 as usual, but the capstan is stopped and the magnetic tape 12 is stopped in the recording video. Record the signal.

After this 0.5 second, the system controller 11A turns the mode switch 4 to the reproducing side (b) and, at the same time, the capstan servo circuit 13 and the drum servo circuit 14.
Is controlled by the rotary video heads 5a and 5b from the magnetic tape 12 in the traveling stopped state, and is sent to the head signal amplifier 6 through the mode switch 4. The head signal amplifier 6 sufficiently amplifies the recorded video signal for one field and sends it to the reproduction FM detector 10, where it is DC converted (step S8).

The DC-converted recording video signal, which is a signal for discriminating the tape, is sent to the system controller 11A, the performance of the magnetic tape 12 is discriminated based on this signal as in the prior art, and the result of the discrimination is stored in a memory. It is stored in 16 (step S9). As a result of the performance discrimination, if the magnetic tape 12 has high performance, the recording FM signal is recorded so that the frequency characteristic at the time of recording the recording video signal is increased, and if the magnetic tape 12 has low performance, the frequency characteristic is set to the normal level. It controls the reproduction FM equalizer 7 together with the equalizer 3. When the frequency characteristics of the recording FM equalizer 3 and the reproducing FM equalizer 7 are controlled, recording of a normal recording video signal is started (step S10).

Example 2. Embodiment 2 of the present invention will be described below with reference to the drawings. FIG. 3 is a block diagram showing the configuration of the magnetic recording / reproducing apparatus according to this embodiment. In the figure, the same parts as in FIG. 10 indicate the same or corresponding parts. Reference numeral 11B is a system controller in this embodiment, and reference numeral 17 is a reproduction signal processing control circuit for changing the noise canceller operation coefficient of the reproduction signal processing circuit 9 based on the performance determination result of the magnetic tape 12 by the system controller 11B. The system controller 11B and the reproduction signal processing control circuit 17 constitute a reproduction signal processing means.

Next, the operation of this embodiment shown in FIG. 3 will be described with reference to FIG.
The reproduction signal processing control circuit 17 will be described with reference to the operation characteristic diagram. Upon recording the recording video signal, the system controller 11B determines the performance of the magnetic tape 12 to be used by the user and receives a command to enter the recording mode based on the performance determination result.
The performance determination operation of is started. First, the mode switch 4 is tilted to the recording side (a), and the recording F is passed through the mode switch 4.
The FM-modulated recording video signal output from the M equalizer 3 is output to the rotary video heads 5a and 5b, and the recording video signal is recorded on the magnetic tape 12 for 0.5 seconds. At this time, the system controller 11B is operated by the capstan servo circuit 1
3 and the drum servo circuit 14 to control the rotary drum 5
Is rotated as usual, but the capstan is stopped so that the recording video signal can be recorded with the magnetic tape 12 stopped running.

After 0.5 seconds, the system controller 11B turns the mode switch 4 to the reproducing side (b), and the capstan servo circuit 13 and the drum servo circuit 1 are operated.
4 is set to the normal reproduction mode, and the recording video signal recorded for one field is stopped in the magnetic tape 12
It is read out by the rotary video heads 5a and 5b and sent to the head signal amplifier 6 through the mode switch 4. The head signal amplifier 6 sufficiently amplifies the recorded video signal for one field and sends it to the reproduction FM detector 10 for DC conversion.

The DC-converted recording video signal for tape discrimination is sent to the system controller 11B. Based on this signal, the performance of the magnetic tape 12 is discriminated and the performance discrimination result is stored in the memory 16 for performance discrimination. As a result, if the magnetic tape 12 with high performance is used, the frequency characteristic at the time of recording the recording video signal is increased, and if the magnetic tape 12 with low performance is used, the frequency characteristic is set to the normal level. Control. The DC-converted output of the reproduction FM detector 10 is also sent to the reproduction signal processing control circuit 17. This reproduction signal processing control circuit 1
As the operation of No. 7, as the output of the reproducing FM detector 10 becomes larger, that is, the magnetic tape 12 as shown in the characteristic diagram of FIG.
Is linearly changed so that the higher the performance of, the smaller the noise canceller operation coefficient.

As a result, at the time of reproducing a screen in which the level of the reproduced FM signal is high and the S / N is good, the noise canceling operation is shallowed to obtain an image in which details are not damaged. On the contrary, when a screen with a poor S / N reproduction signal is reproduced, the noise canceling operation is deepened so that a video with less noise can be obtained.

Example 3. The third embodiment of the present invention will be described below with reference to the drawings. FIG. 5 is a block diagram showing the configuration of the magnetic recording / reproducing apparatus according to this embodiment. In the figure, the same parts as those in FIG. 2 indicate the same or corresponding parts. Reference numeral 11C is a system controller in this embodiment. The system controller 11C constitutes signal processing means.

Next, the operation of this embodiment shown in FIG. 5 will be described with reference to FIG.
Tape pattern diagram on magnetic tape 12 and playback F
A description will be given along the M signal characteristic diagram. In the figure, 12 is a magnetic tape, 61 is a tape pattern on the magnetic tape 12 that is normally recorded, 62 is the trajectory of the head when the tape running is stopped, and 63 is a reproduction output from the head signal amplifier 6 when the tape running is stopped. FM signal 64 is an output signal of the reproduction FM detector 10.

When the system controller 11C receives a command from the user at the time of recording a recording video signal to judge the performance of the magnetic tape 12 to be used and enter the recording mode based on the result of the performance judgment, the magnetic tape is as follows. The performance determination operation 12 is started. First, the mode switch 4 is turned to the recording side (a), and the FM-modulated recording video signal, which is the output of the recording FM equalizer 3, is output to the rotary video heads 5 a and 5 b via the mode switch 4. Recording The video signal is recorded for 0.5 seconds. At this time,
The system controller 11C controls the capstan servo circuit 13 and the drum servo circuit 14 to rotate the rotary drum 5 as usual, but the capstan is stopped and the recording video signal is recorded while the magnetic tape 12 is stopped. It can be so.

After 0.5 seconds, the system controller 11C turns the mode switch 4 to the reproducing side (b) and, at the same time, the capstan servo circuit 13 and the drum servo circuit 14.
Is set to a normal reproduction mode, and a recording video signal recorded for one field is picked up from the magnetic tape 12 in a stopped state using only the L azimuth head, for example, the rotary video head 5b as a reproduction head. As a result, the output of the head signal amplifier 6 becomes a signal 63 like an abacus ball as shown in FIG.
The reproduction FM detector 10 sends a direct current component 64 of the reproduction FM signal as shown in FIG. 6 to the system controller 11C.

The signal output from the reproduction FM detector 10 cannot obtain a uniform output from one field as compared with normal signal reproduction, but the maximum point of the reproduction FM detector output 64 is set by the system controller 11C. By reading,
Even if the magnetic tape 12 is not run, a detection output equivalent to that when the magnetic tape 12 is run can be obtained, whereby the performance of the magnetic tape 12 can be determined.

Example 4. Embodiment 4 of the present invention will be described below with reference to the drawings. FIG. 5 is a block diagram showing the configuration of the magnetic recording / reproducing apparatus according to this embodiment. In the figure, the same parts as those in FIG. 2 indicate the same or corresponding parts. Reference numeral 11D is a system controller in this embodiment. This system controller 11 constitutes a signal recording means.

Next, the operation of this embodiment shown in FIG. 5 will be described with reference to FIG.
A description will be given along the flowchart shown in FIG. When the system controller 11D receives a command from the user to judge the performance of the magnetic tape 1212 to be used at the time of recording the recorded video signal and to enter the recording mode based on the result of the performance judgment, the performance of the magnetic tape 12 is as follows. Enter the discrimination operation. First, the system controller D turns the mode switch 4 to the recording side (a), controls the capstan servo circuit 13 in this state, and rewinds the magnetic tape 12 to a position where normal recording is started for a certain time (step S10).
During this rewinding operation, the tape discriminating signal output from the tape discriminating signal generator (not shown) is applied to the mode switch 4
The data is output to the rotary video heads 5a and 5b via the and recorded on the magnetic tape 12 (step S11).

The tape discriminating signal recorded so far is read from the magnetic tape 12 until the rewinding operation is completed and immediately before the actual recording is started, and is amplified by the head signal amplifier 6 and then is reproduced by the reproducing FM detector 10. send. At this time, the tape pattern during recording and the locus of the head for signal reproduction do not match as shown in FIG. 6, and the reproduction FM signal has a shape similar to the reproduction FM signal 63 shown in FIG. However, by reading the maximum point of the reproduction FM detector output 64 with the system controller 11D, a detection output equivalent to that when the magnetic tape 12 is run can be obtained without running the magnetic tape 12, and thus the performance of the magnetic tape 12 can be determined. It can be performed (step S12).

The result of performance discrimination is stored in the memory 16. As a result of the performance discrimination, if the magnetic tape 12 has a high performance, the magnetic tape 12 having a low performance is used in the direction of improving the frequency characteristic at the time of recording the recording video signal. For example, the recording FM equalizer 3 is controlled so that the frequency characteristic has a normal level. If the frequency characteristic of the recording FM equalizer 3 is controlled,
The recording mode is shifted to the normal recording mode for recording on the magnetic tape 12 and the recording of the recording video signal is started (step S13).

Example 5. Embodiment 5 of the present invention will be described below with reference to the drawings. FIG. 5 is a block diagram showing the configuration of the magnetic recording / reproducing apparatus according to this embodiment. In the figure, the same parts as in FIG. 10 indicate the same or corresponding parts. Reference numeral 11E is a system controller in this embodiment. This system controller 11E constitutes a reproduction signal processing means.

Next, the operation of this embodiment will be described with reference to the reproduction FM equalizer characteristic diagram of FIG. In FIG. 8, 81
Is a reproduction FM equalizer characteristic during normal reproduction, and 82 is a reproduction FM equalizer characteristic during special reproduction. The system controller 11E discriminates the performance of the magnetic tape 12 from the detection output fetched from the reproducing FM detector 10, and changes the frequency characteristic of the reproducing FM equalizer 7 based on the discrimination result. At this time, the system controller 11E sets the frequency characteristic of the reproduction FM equalizer 7 in accordance with the reproduction FM equalizer characteristic 81 during normal reproduction.

However, in the case of normal reproduction, the frequency may be set in accordance with the equalizer characteristics, but in special reproduction, for example, in the case of pause, double speed feed or slow feed, the reproduced FM signal is shown in FIG. As described above, a uniform output cannot be obtained for one field, and the absolute level of output decreases. As a result, the inversion phenomenon is likely to occur when the reproduced FM signal is demodulated by the FM demodulator. Therefore, the system controller 11E sets the frequency characteristic in the reproduction signal processing circuit 7 according to the reproduction FM equalizer characteristic 82 in the special reproduction of FIG. 8 during the special reproduction. As a result, it becomes possible to control the image quality corresponding to any special reproduction process, and thus the image quality control suitable for the magnetic tape 12 to be used can be efficiently performed.

Example 6. Embodiment 6 of the present invention will be described below with reference to the drawings. FIG. 5 is a block diagram showing the configuration of the magnetic recording / reproducing apparatus according to this embodiment. In the figure, the same parts as in FIG. 10 indicate the same or corresponding parts. 11F is a system controller in this embodiment. The system controller 11F constitutes a signal storage means.

Next, the operation of this embodiment shown in FIG. 5 will be described with reference to FIG.
It will be described according to the flowchart of When recording the recorded video signal, the system controller 11F determines the performance of the magnetic tape 12 to be used by the user and receives a command to enter the recording mode based on the performance determination result. Enter the discrimination operation. First, the system controller 11F controls the capstan servo circuit 13 to wind the magnetic tape 12 for 0.3 seconds (step S14). By this winding operation, the floating of the magnetic tape 12 due to slack of the magnetic tape 12 is eliminated, and stable recording and reproduction can be always performed even when the tape running is stopped.

Example 7. Embodiment 7 of the present invention will be described below with reference to the drawings. FIG. 5 is a block diagram showing the configuration of the magnetic recording / reproducing apparatus according to this embodiment. In the figure, the same parts as in FIG. 10 indicate the same or corresponding parts. 11G is a system controller in the present embodiment.

Next, the operation of this embodiment shown in FIG. 6 will be described with reference to the flow chart of FIG. Magnetic tape 1
After winding 2 for 0.3 seconds, capstan servo circuit 1
One channel of the tape performance discrimination signal is operated only by the L azimuth head (rotating video head 5b) by operating the head switch 5C while controlling the magnetic tape 12 while the magnetic tape 12 is stopped.
Recording is performed for 0.3 seconds (step S15). During such one-channel recording, only the luminance portion of the actual video signal is recorded and the color signal is not recorded (step S16). When switching the playback mode, the system controller 11G also operates the head switch 5c to operate the L azimuth head 5
The tape performance determination signal is read out at b, reproduced for 0.3 seconds and sent to the head signal amplifier 6, and then reproduced FM detection 1
It is output to 0 (step S17). Reproduction FM detector 10
Is sent to the system controller 11G to determine the performance of the magnetic tape 12, and the result is stored in the memory 16 (step S18). In this way, the discriminant waveform becomes stable by always recording and reproducing with the same azimuth head,
As a result, the discrimination time is shortened.

Next, the system controller 11G determines from the result of the performance determination that the magnetic tape 12 with high performance tends to enhance the frequency characteristic at the time of recording the recording video signal, and the magnetic tape 12 with low performance has the frequency. The recording FM equalizer 3 is controlled so that the characteristic becomes a normal level. When the frequency characteristic of the recording FM equalizer 3 is controlled, the recording start state of the normal recording video signal is set (step S19).

Example 8. Further, in the first embodiment, the signal recording / reproducing time for discriminating the tape performance was 0.5 seconds, but these times are not particularly specified as long as there is no problem in the discriminating performance. Alternatively, recording and reproduction may be performed every rotation of the rotary drum 5 without being separated from recording and reproduction operations. Furthermore, not only the recording FM equalizer 3 but also the F
It goes without saying that the signal before M-modulation may be processed.

Example 9. In the fifth embodiment, the magnetic tape performance and the frequency characteristic of the FM equalizer are specially changed at the time of special reproduction. In particular, the frequency characteristic correction is stopped by the performance of the magnetic tape 12 to return to the normal characteristic. Is also good. It goes without saying that frequency characteristic switching depending on the tape running speed such as SP mode and EP mode may be added. Further, although the winding time is limited to 0.3 seconds in the sixth embodiment, the winding time is not particularly limited and may be any number of seconds. Furthermore, Example 4 above
In the above, the system controller 11D reads the output of the reproducing FM detector at the maximum value to determine the performance of the magnetic tape 12, but this is not the maximum value as long as it is a value that can be correlated with the level during normal reproduction. Is also good. next. It goes without saying that the tape performance determination signal is not limited to one type, and a plurality of types of signals may be used.

[0052]

According to the invention of claim 1, after a video signal is recorded for a short time on the magnetic recording medium in which the traveling is stopped, the recorded video signal is read from the magnetic recording medium in the traveling stopped and reproduced. A performance discriminating means for discriminating the performance of the magnetic recording medium, a storage means for storing a performance discriminating result by the performance discriminating means, and a signal for controlling a signal processing operation of a video signal to be recorded based on the performance discriminating result. By including the processing means, it is possible to record and reproduce a signal for performance determination of the magnetic recording medium without running the magnetic recording medium, and thus it is possible to instantly determine the performance of the magnetic recording medium. effective.

According to the second aspect of the present invention, after the video signal is recorded for a short time on the magnetic recording medium whose traveling is stopped, the recorded video signal is read from the magnetic recording medium whose traveling is stopped and reproduced. Therefore, there are provided a performance discriminating means for discriminating the performance of the magnetic recording medium, and a reproduction signal processing means for controlling the operation of the reproducing system circuit for reproducing the read video signal according to the result of discriminating the performance of the magnetic recording medium. Since it is provided, there is an effect that a video screen conforming to the magnetic recording medium performance can be obtained.

According to the third aspect of the present invention, the magnetic recording medium is rewound for a predetermined time, and at the same time, a signal recording means for recording a video signal at the time of rewinding and the recorded video signal are read out from the magnetic recording medium. A signal for performance discrimination is provided because it comprises a performance discriminating means for reproducing the magnetic recording medium and discriminating the performance of the magnetic recording medium, and a signal processing means for controlling the signal processing operation of the video signal to be recorded based on the performance discrimination result. There is an effect that the time from recording to signal reproduction and normal signal recording can be shortened.

According to the fourth aspect of the present invention, after the video signal is recorded for a short time on the magnetic recording medium whose traveling is stopped, the recorded video signal is read from the magnetic recording medium whose traveling is stopped and reproduced. Therefore, the operation of the performance discriminating means for discriminating the performance of the magnetic recording medium and the operation of the reproducing system circuit for reproducing the read video signal is performed as the performance discriminating result of the magnetic recording medium and the special reproducing operation of the magnetic recording medium. Since it is provided with a reproduction signal processing means for controlling in accordance therewith, there is an effect that more precise image quality control according to tape performance and tape operation can be performed.

According to the invention of claim 5, a signal recording means for recording a video signal after winding the magnetic recording medium for a certain period of time, and the recorded video signal is read from the magnetic recording medium and reproduced, Since the performance discriminating means for discriminating the performance of the magnetic recording medium and the signal processing means for controlling the signal processing operation of the video signal to be recorded based on the performance discrimination result are provided, the tape floating due to the looseness of the tape is eliminated. Thus, even when the tape running is stopped, it is possible to always record and reproduce signals in a stable state, and thus it is possible to perform highly accurate tape performance determination.

According to the invention of claim 6, a video signal is recorded for a short time on only one of the azimuth heads of the video head on the magnetic recording medium while the traveling is stopped, and then the recorded azimuth head is used to record the video signal on the magnetic field. Performance discriminating means for reading out from a recording medium and reproducing it, thereby discriminating the performance of the magnetic recording medium, storage means for storing the performance discriminating result, and a video signal recorded on the magnetic recording medium based on the performance discriminating result. Since the signal for performance determination can be recorded and reproduced by the same azimuth head at all times because the signal processing means for controlling the signal processing operation of (4) is provided, the waveform of the signal for performance determination is stable, and the signal of the magnetic recording medium is strong. There is an effect that the performance determination time can be shortened.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a magnetic recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of this embodiment.

FIG. 3 is a block diagram showing a configuration of a magnetic recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 4 is a characteristic diagram illustrating an operation of a reproduction signal processing control circuit in the present embodiment.

FIG. 5 is a block diagram showing a configuration of a magnetic recording / reproducing apparatus according to embodiments 3 to 7 of the present invention.

6A and 6B are a tape pattern diagram and a reproduction FM detection output characteristic diagram for explaining the operation of the third embodiment.

FIG. 7 is a flowchart illustrating the operation of the fourth embodiment.

FIG. 8 is a reproduction FM equalizer characteristic diagram for explaining the operation of the reproduction signal processing control circuit in the fifth embodiment.

FIG. 9 is a flowchart illustrating the operation of Examples 6 and 7.

FIG. 10 is a block diagram showing a configuration of a conventional magnetic recording / reproducing apparatus.

FIG. 11 is a flowchart illustrating the operation of a conventional device.

[Explanation of symbols]

 3 recording FM equalizer 5 rotary drum 5a, 5b rotary video head 7 playback FM equalizer 9 playback signal processing circuit 10 playback FM detector 11A to 11G system controller 12 magnetic tape 16 memory 17 playback signal processing control circuit

Claims (6)

[Claims] 1. A magnetic recording / reproducing apparatus for recording a video signal on a magnetic recording medium and reading the video signal from the magnetic recording medium for reproduction, wherein the video signal is recorded for a short time on the magnetic recording medium while traveling is stopped. After that, the recorded video signal is read from the magnetic recording medium in which the running is stopped and reproduced, and the performance determination means for performing the performance determination of the magnetic recording medium, and the performance determination result by the performance determination means are stored. A magnetic recording / reproducing apparatus comprising: storage means and signal processing means for controlling a signal processing operation of a video signal to be recorded based on the performance determination result. 2. A magnetic recording / reproducing apparatus for recording a video signal on a magnetic recording medium and reading the video signal from the magnetic recording medium for reproduction, wherein the video signal is recorded for a short time on the magnetic recording medium while traveling is stopped. After that, the recorded video signal is read from the magnetic recording medium in which the traveling is stopped and reproduced, and the performance discriminating means for discriminating the performance of the magnetic recording medium, and a reproducing system for reproducing the read video signal. A magnetic recording / reproducing apparatus comprising: a reproduction signal processing means for controlling the operation of the circuit in accordance with the result of performance discrimination of the magnetic recording medium. 3. In a magnetic recording / reproducing apparatus for recording a video signal on a magnetic recording medium and reading the video signal from the magnetic recording medium for reproduction, the magnetic recording medium is rewound for a predetermined time and at the same time, the rewinding is performed. Sometimes a signal recording means for recording a video signal, a performance discriminating means for reading out the recorded video signal from the magnetic recording medium and reproducing it, thereby discriminating the performance of the magnetic recording medium, and based on the performance discriminating result. A magnetic recording / reproducing apparatus comprising: a signal processing unit that controls a signal processing operation of a video signal to be recorded. 4. A magnetic recording / reproducing apparatus for recording a video signal on a magnetic recording medium and reading the video signal from the magnetic recording medium for reproduction, wherein the video signal is recorded for a short time on the magnetic recording medium while traveling is stopped. Thereafter, the recorded video signal is read from the magnetic recording medium in which the traveling is stopped and reproduced, and the performance discriminating means for discriminating the performance of the magnetic recording medium, and a reproducing system circuit for reproducing the read video signal. And a reproduction signal processing means for controlling the operation according to the performance discrimination result of the magnetic recording medium and the special reproduction operation of the magnetic recording medium. 5. A magnetic recording / reproducing apparatus for recording a video signal on a magnetic recording medium, and reading the video signal from the magnetic recording medium for reproduction, and recording the video signal after winding the magnetic recording medium for a certain period of time. Signal recording means, performance discriminating means for reading the recorded video signal from the magnetic recording medium and reproducing it, thereby discriminating the performance of the magnetic recording medium, and a signal of the video signal to be recorded based on the performance discriminating result. A magnetic recording / reproducing apparatus comprising: a signal processing unit for controlling a processing operation. 6. A magnetic recording / reproducing apparatus for recording a video signal on a magnetic recording medium and reading the video signal from the magnetic recording medium for reproduction, wherein the magnetic recording medium is stopped when the performance of the magnetic recording medium is judged. A video signal is recorded on the recording medium for only a short time by one of the azimuth heads of the video head, and then the recorded azimuth head reads the video signal from the magnetic recording medium and reproduces it, thereby determining the performance of the magnetic recording medium. And a signal processing unit for controlling a signal processing operation of a video signal to be recorded on the magnetic recording medium based on the performance determination result. Magnetic recording / reproducing device.