JPH05135554A - Magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To show the video recording contents in a list by recording digital date showing the recording contents at a part of a V-P guard part of a track of an 8mm recording format and then reproducing the recorded contents in a rapid forward or rewind mode. CONSTITUTION:The outline information on the recording contents are recorded at a V-P guard part of a magnetic track. Then the horizontal synchronizing signals are counted by a counter 31 when the recorded information are reproduced in a rapid forward or rewind state. A pulse generator 32 is driven by the output of the counter 31, and a gate circuit is closed for a 0.5H period. Under such conditions, a data area is scanned by a rotary head H and the data reproduction output is detected by a demodulation circuit 27 after passing through a gate circuit 26. Then the detected output is digitized by a detector circuit 28, inputted to a control part 29, and stored successively in a frame memory. The output stored in the frame memory is outputted to a viewfinder 30. Thus it is possible to display the recording contents in a list and to easily search a desired image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention records a video signal on a diagonal track of a tape by a rotary magnetic head,
The present invention relates to a magnetic recording / reproducing apparatus capable of reproducing, and particularly to a magnetic recording / reproducing apparatus capable of displaying a list of contents of video signals recorded on a track.

[0002]

2. Description of the Related Art A system for recording / reproducing a video signal and an audio signal on an 8 mm video tape by a helical scan system has been standardized and commercialized as an 8 mm video recording / reproducing system. FIG. 6 shows an example of such an 8 mm video rotary head device, and FIG. 7 shows its tape format. In these figures, H _A and H _B indicate rotary heads for recording / reproducing, 1 is a rotary drum, 2 is a rotary drum 1 wound in a range of 180 ° + α with respect to the rotary drum 1, and is indicated by an arrow 3T. It is a magnetic tape running in the direction. The two rotary heads H _A and H _B are configured such that the azimuth angles of the magnetic gaps are different from each other,
It is attached so as to slightly project from the rotary drum 1 at angular intervals of °. Then, rotating in the direction of the arrow 3H at a frame frequency of the video signal (30H _Z). Therefore, in the recording tracks of the magnetic tape 2 formed by such a rotary head device, as shown in FIG. 7, tracks 4A and 4B having different azimuths are alternately formed in the oblique direction of the magnetic tape 2. 180 ° of trucks 4A and 4B
Normally, a video signal is recorded in the area AV corresponding to the corner, and in the area AP of the α angle (≈36 °), the audio signal is shortened on the time axis, and the signal converted into PCM (Pulse Code Modulation) is one field. The data can be recorded sequentially for each item. (Note that in 8mm video, the audio signal is in the area AP above.
Not limited to, the frequency of the audio signal is modulated and the rotary head H
It is also possible to supply it to _A and H _B and superimpose it on the video signal area AV for recording. )

As described above, in the 8 mm video recording / reproducing system, since a function of recording / reproducing an audio signal by the rotary heads H _A and H _B is added, an extremely high quality audio signal can be reproduced. Recording / playback can be performed. The 8 mm video track format as described above will be described in more detail. The signal format is as shown in FIG. That is, in one recording track, from the area where the rotary head contacts the tape 2, first,
The head angle of 5 degrees is regarded as the plunge section 11. The plunge section 11
In the latter half period of 2.06 degrees (corresponding to 3H of the video signal), the preamble section 12 becomes a part of the clock line synchronized with the PCM data.

Following the preamble section 12, a time-axis-compressed audio signal is converted into PCM data and recorded P
The CM data part 13 is provided over 26.32 degrees. Then, following the PCM data section 13, 2.
During the period of 06 degrees (3H), it is the postamble part 14,
The subsequent 2.62 degrees is used as a VP guard section 15 indicating the boundary between the video signal and the PCM data section. The video signal recording area 16 is formed subsequent to the VP guard portion 15, and as described above, one field of video signal is recorded over 180 degrees, and at the same time, a tracking pilot signal is recorded in this portion. Are overlaid. At the end, the separating portion 17 for about 5 degrees is provided.

[0005]

When the magnetic recording apparatus of this type is used in, for example, the LP mode, it is possible to record for about 2 hours with a single cassette tape.
Therefore, a single cassette tape will record memories and events of travel multiple times. In such a case, in particular, what recording content is recorded in one tape in what order. I forget what it is. In addition, it is difficult to find the position of the recorded content on the tape.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first area for recording a video signal on a track of a magnetic recording tape and an extension of the first area. Magnetic recording / reproducing for recording / reproducing using a magnetic recording tape cassette having a second region located above and for recording an audio signal, and a third region located between the first and second regions. In the apparatus, when the outline information of the contents recorded on the magnetic recording tape is recorded in the third area, and thereafter when the magnetic recording tape cassette is mounted and fast-forwarded or rewound, the information is reproduced. The outline information is read, the information is stored in a memory, and a list can be displayed on a display device. .

[0007]

In the case of the simple type 8 mm VTR, the angle at which the magnetic tape is wound around the rotary drum is usually set to be slightly larger than 180 °, and the V of the 8 mm recording format track formed diagonally is formed. -P guard 15
Digital data indicating recorded contents can be recorded in a part of the. Then, the recorded data can be stored in the video RAM or the like by fast-forwarding this part or reproducing it at the time of rewinding and can be displayed on the viewfinder or monitor screen of the camera.

[0008]

1 shows a recording format on an 8 mm tape according to an embodiment of the present invention, in which a plurality of tracks T are sequentially formed on a magnetic tape 10 in an oblique direction by two rotating magnetic heads. As described above, the track area of about 30 ° in the first half is the PCM signal area, and the video signal area (Video) is provided in the part of about 180 ° in the latter half via the V-P guard for about 3.8H. There is. In the case of the magnetic recording / reproducing apparatus of the present invention, the user is configured to record the digital data M regarding the recorded contents as described later in the area of the VP guard, and this portion is recorded. The reading is performed as the summary information indicating the contents.

FIG. 2 is an enlarged view of this portion.
Head plunge section 11, PCM signal preamble section 1
2, a PCM data section 13 and a VP guard section 15 after the postamble section 14 are provided. And this V
-A data area 15A is provided in the P guard unit 15,
In the data area 15A, recorded event information, time code, etc. can be recorded as digital data. The video recording area 16 is recorded after the VP guard unit 15. In the data recording area, as shown in FIG.
_{The S} is arranged at the head, and the mode bit D _M is provided next. Then, after that, a 4-word code signal D ₀
The data bits of D ₃ to D ₃ follow, and the error correction code D _C and the end bit D _E are recorded.

The data bits D _{0 to} D ₃ are composed of the number of the recorded event, the encoded data of the title of the recorded event, and the time code indicating the position on the tape corresponding to the recorded title. It should be noted that this data bit may be input and recorded by the user with the setting K- during recording, or may be input by an after recording operation. Further, the above-mentioned data area is read out in high speed fast forward or rewind mode when the tape is reproduced. In this case, the head that scans each recording track does not always read the complete data, but it is necessary to read the data obtained at the playback timing of the data area for each rotation of the drum, and to accurately reproduce the data. Data is stored in the memory. Then, record this data in a field memory or the like,
Display the list on the monitor screen or on the buffer ID.

FIG. 4 is a block diagram of the magnetic recording / reproducing apparatus of the present invention, in which 20 is two rotary magnetic heads H.
_A rotary drum having _A and H _B , 21 a recording / reproducing changeover switch, 22 A and 22 B an amplifier for outputting a reproduction signal, and 22 C and 22 _D supplying a recording signal to the rotary magnetic heads H _A and H _B. Amplifier, 23 is the rotary head H
_A, the H _B shows a switching circuit for switching by the switching pulse, eg PCM signal reproduced in the PCM recording is possible models are switched so as to be input to the audio signal processing circuit 24 as indicated by the dotted lines. Further, in the case of a model having no PCM recording function, the reproduction signals of the rotary magnetic heads H _A and H _B are continuously input to the video signal processing circuit 25, and the FM
The modulated audio signal is separated and input to the audio signal processing circuit 24. 26 is a gate circuit closed by the pulse generator 32 described later during the above-mentioned data area, 27 is a demodulation circuit, 28 is a signal detection circuit, and 29 is 8 mm.
A control unit (CPU) 30 which outputs a control signal corresponding to various operation modes of the VTR, 30 represents a system controller.

Reference numeral 31 denotes a counter that counts a clock signal locked to a horizontal synchronizing signal during reproduction or recording, and this counter is reset to 0 when the vertical synchronizing signal VD is input. When the counter 31 reaches a predetermined count value, the pulse generation circuit 32 outputs a signal having a pulse width of approximately 0.5H, and the gate circuit 26
And 33 are closed. Reference numeral 34 is a data generator for outputting the data to be recorded as shown in FIG. 3
Reference numeral 5 denotes a switching pulse generation circuit that detects the rotation phase reference signal PG of the rotary drum 20 and forms an open / close switching pulse for the switch circuit 23.

The magnetic recording / reproducing apparatus of the present invention is characterized in that the reproduction signal output from the amplifiers 22A and 22B is introduced into the gate circuit 26 during reproduction by performing fast forward or rewind operation in the title reading mode. .. The gate circuit 26 counts the horizontal synchronizing signal PH (the horizontal synchronizing signal is a continuous signal by the PLL circuit) of the video signal being reproduced, and the count value of the counter 31 is, for example, N. The output SG of the pulse generator 32 driven by the current output is closed for a period of approximately 0.5H. By the way, the counter 31 is also reset to 0 by the vertical synchronizing signal VD of the video signal and counts the horizontal synchronizing signal PH with this point as a reference.
A gate circuit with a count value N of the number of horizontal synchronizing signals for the field + α (α is set to a number corresponding to the number of horizontal synchronizing signals +2 in the end period of the head plunge portion 11 to the postamble portion 14 in FIG. 2) When 26 is closed, the reproduction output just when the rotary head is scanning the data area 15A passes through the gate circuit 26. Therefore, the output signal passing through the gate circuit 26 is detected by the demodulation circuit 27, and the signal digitized by the detection circuit 28 is input to the control unit 29. The data input to the control unit 29 is temporarily stored in a memory or the like and sequentially stored in the frame memory. Then, the contents of this frame memory are output to the buider.

FIG. 5 shows an example of each time code of the title output to the buffider, and the contents recorded on one tape are displayed in numerical order. Therefore, when it is desired to know the contents recorded on a certain cassette tape, fast-forward reproduction in the title display mode makes it possible to check all the titles recorded on the tape while looking at the buider. For the title data, for example, when the data input mode is switched at a predetermined position while playing back the tape after recording, an item (ROM) provided in the CPU 29 is selected or a keyboard is input from an external control terminal. Etc. can be used to enter. Then, the character data input from the data generator 34 is output at a predetermined timing, and the title number, contents, etc. are recorded in the data area via the gate 33. It is also possible to access the contents by specifying a predetermined recording content with a time code while watching the title and performing a cueing operation.

[0015]

As described above, the magnetic recording / reproducing apparatus of the present invention displays the contents of the recorded video in the intermediate portion (VP guard section) between the area for recording the video signal and the area for recording the audio signal. It is configured so that the user can enter the data shown here, and this data can be displayed on the buffer or monitor screen by the fast-forward operation, so many titles are recorded on one cassette tape. Even when it is, you can easily display what title video is recorded on which part of the tape. Further, there is an advantage that it is possible to easily search for a desired video on this display screen.

[Brief description of drawings]

FIG. 1 is a format of a tape recorded by a magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is a detailed explanatory diagram of a tape on which data is recorded.

FIG. 3 is an explanatory diagram showing an example of recorded digital data.

FIG. 4 is a block diagram showing an example of a magnetic recording / reproducing apparatus.

FIG. 5 is a diagram showing an example of a title display screen.

FIG. 6 is an explanatory diagram of an 8 mm type rotary head.

FIG. 7 is an explanatory diagram of a recording track of 8 mm tape.

FIG. 8 is a detailed explanatory diagram of recording tracks.

[Explanation of symbols]

 20 rotary drum 21 recording / reproduction changeover switch 23 head changeover switch 26 gate circuit 29 control section

Claims (1)

[Claims] 1. A first area for recording a video signal on a track of a magnetic recording tape, a second area for recording an audio signal located on an extension of the first area, and the first area. Second
In a magnetic recording / reproducing apparatus for recording / reproducing using a magnetic recording tape cassette having a third area located between the third area and the third area, the summary information of the contents recorded on the magnetic recording tape is provided in the third area. A rotary head for recording and reproducing, a signal processing means for processing a signal from the rotary head, a memory for storing signal information processed by the signal processing means, a rotation of the recording tape, and a recording / reproducing processing. A magnetic recording / reproducing apparatus comprising control means for controlling, after mounting the magnetic recording tape cassette, reading all the outline information, storing the information in the memory, and displaying the information in a list on a display device.