JPH0666939B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention provides a code through a first region of a recording track formed on a magnetic tape in a direction oblique to the running direction of the magnetic tape. The present invention relates to a magnetic recording / reproducing apparatus such as a so-called 8 mm video tape recorder which records / reproduces a converted audio signal and records / reproduces an image signal via the second area of the recording track. The present invention also relates to a magnetic recording / reproducing device for recording / reproducing.

[Outline of Invention]

The present invention relates to a magnetic recording / reproducing apparatus which records and reproduces a still image signal together with an audio signal by performing memory control of a video reproducing system in accordance with a control code recorded on a magnetic tape, thereby converting a still image into an audio signal. It is adapted to be dynamically switched together.

[Prior Art] Conventionally, recording / reproducing of an encoded audio signal is performed via a first area of a recording track formed on a magnetic tape in a direction oblique to the running direction of the magnetic tape. A so-called 8 mm video tape recorder is known as a magnetic recording / reproducing apparatus for recording / reproducing an image signal via the second area of the recording track.

In the standard of this 8 mm video tape recorder, recording and reproduction are performed by using a pair of rotary heads provided at an angular interval of 180 ° with each other, and the magnetic tape is wound within a range of 221 ° on the head rotation peripheral surface. To be And this 2
Recording and reproduction of the video signal is performed in the 180 ° section of 21 °, and recording and reproduction of the audio signal that is coded (PCM) and time-axis compressed is performed in the remaining 36 ° section. Has become.

That is, FIG. 6 shows a format of a magnetic track on a magnetic tape according to the above-mentioned standard. From the right side where the head starts contact with the magnetic tape, first, a plunge portion 51 at a rotation angle of the head of 5 ° is provided at the tip. Is provided, and 2.06 ° in the latter half of the rush section 51 (corresponding to 3 horizontal periods (H) of the video signal)
During the period, a clock run-in unit 52 that synchronizes with the subsequent PCM data is provided. Following the run-in section 52, a PCM data section 53 of a time-axis-compressed audio signal is provided over 26.32 °. The 2.06 ° (3H) period following the data section 53 is used as a back margin section 54 against recording misalignment at the time of after-recording, and then a 2.62 ° video section.
A guard unit 55 for the PCM data unit is provided. Then, following this guard section 55, a video signal section 56 for one field
Is provided over 180 °. Further, after this, a separation portion 57 for 5 ° is provided.

Therefore, in this standard, a video signal of one field is recorded and reproduced by the video signal unit 56, and the audio signal for 1/60 seconds during this time is converted into PCM and subjected to processing such as error correction, It is time-axis compressed to about 1 / 6.8 and recorded / reproduced in the PCM data section 53. The recording tracks are sequentially provided obliquely in the longitudinal direction of the magnetic tape to record and reproduce continuous video signals and audio signals.

By the way, according to the above standard, 180
Dividing the angle into 5 equals 36 °. On the other hand, the PCM data section 53 and the 5 ° of the rush section 51, the back margin section that follows
It is just 36 ° when adding 2.06 ° of 54 and 2.62 ° of guard part 55. Therefore, by diverting the device of the above standard,
A multi-segment PCM recorder dedicated to audio signals has been proposed.

FIG. 7 shows an example of a recording track format for that purpose. In FIG. 7, the protrusion 51 to the guard 55 on the side where the heads start to contact each other is equivalent to the above standard, and this section is referred to as the first segment. Next, a rush section 61, a line-in section 62, a data section 63, a margin section 64, and a guard section 65 having the same configuration as described above are provided from the start side of the conventional video signal section 56, and this section is the second segment. . Further, the same configuration as that of the second segment is repeatedly provided for every 36 ° of the video signal section 56 to form the third to sixth segments. Then, after this, a separation portion 57 for 5 ° is provided.

As a result, the first to sixth segments are provided. Then, with respect to each of these segments, the rotational angle position of the rotary head is detected, and from the contact start end side of the head, respectively.
Each segment is recorded and reproduced independently by outputting PCM data at 36 ° intervals and recording at a time corresponding to a predetermined segment (section), and by gated and reproducing the time of the reproduction signal. can do. When recording is performed again on a magnetic tape that has been used once, a so-called flying erase head is used to drive the head only for a time in contact with a section of a desired segment, and only that section is driven. It is possible to selectively erase and re-record.

In this way, the PCM audio signal can be independently recorded and reproduced in each of the six sections of the magnetic tape divided in the width direction. For example, a video tape capable of recording for four hours is used, which is six times the PCM for 24 hours. Audio signals can be recorded and reproduced.

Furthermore, in such a multi-segment PCM recorder dedicated to a PCM audio signal for a long time, it is required to further have a recording / reproducing function of an image signal, and the PCM data part 53 of the standard of the above-mentioned 8 mm video tape recorder is provided with audio. A method of recording an encoded image signal when there is no signal has been proposed (see Japanese Patent Laid-Open No. 164383 / 58-164383), but it has not been possible to record / reproduce an audio signal and a video signal at the same time.

[Problems to be solved by the invention]

Since it is not possible to record and reproduce the audio signal and the video signal at the same time by the conventional technique as described above, the applicant of the present invention has recorded the still image signal in the second area on the same track as the recording track of the encoded audio signal. We have previously proposed a magnetic recording device that enables simultaneous recording of audio signals and video signals by encoding and recording (Japanese Patent Application No. 60-204991).
issue).

By the way, in the magnetic recording apparatus for recording the audio signal and the still image signal as described above, when the still image signal is recorded for one horizontal period (1H) in the PCM data portion of one segment,
In the reproducing apparatus, it takes about 4 seconds to reproduce one screen of a still image, and the reproduction screen does not change unless it is about every 4 seconds, so that the image changes with respect to the audio signal. There is a problem that it is monotonous.

In view of the above-mentioned problems, the present invention is directed to an audio signal encoded via a first region of a recording track formed on a magnetic tape in a direction oblique to the running direction of the magnetic tape. In a magnetic recording / reproducing apparatus for recording / reproducing data, and for recording / reproducing a still image signal encoded via the second area of the recording track, a still image can be dynamically changed in accordance with an audio signal. The purpose is to

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides an audio signal encoded via a first area of a recording track formed on a magnetic tape in a direction oblique to the running direction of the magnetic tape. In the magnetic recording / reproducing apparatus for recording / reproducing the still image signal encoded via the second area of the recording track, a plurality of still image signals reproduced from the magnetic tape are stored. A field memory and a memory control means for controlling writing and reading of a still image signal to and from the plurality of field memories according to a control code recorded on the magnetic tape are provided.

[Action]

In the magnetic recording / reproducing apparatus according to the present invention, the reproduction still image is reproduced by controlling the writing and reading of the still image signal to / from the plurality of field memories of the image reproducing system by the memory control means according to the control code recorded on the magnetic tape. It can be switched dynamically according to the audio signal.

〔Example〕

An embodiment of a magnetic recording / reproducing apparatus according to the present invention will be described below in detail with reference to the drawings.

1 to 5 show an embodiment of a multi-segment PCM recorder to which the present invention is applied, and FIG. 1 is a block diagram showing a main configuration of a reproducing system of this embodiment,
FIG. 2 is a timing chart for explaining a still image reproducing operation in the reproducing system, FIG. 3 is a block diagram showing a configuration of a main part of the recording system in the embodiment, and FIG.
FIG. 5 is a schematic diagram for explaining a recording operation of a still image signal by the recording system, and FIG. 5 is a schematic diagram showing a format of a recording track by the recording system.

In the block diagram of FIG. 3 showing the configuration of the main part of the recording system of this embodiment, the input audio signal is supplied from the first signal input terminal 1 to the A / D conversion circuit 3 through the noise reduction (NR) circuit 2. Is digitized by the A / D conversion circuit 3 and supplied to the 8 mm PCM signal processing circuit 4. The digitized input audio signal is converted into a predetermined recording PCM signal by the 8 mm PCM signal processing circuit 4 and supplied from the changeover switch 5 to the magnetic head 7 via the recording amplifier 6.

In addition, the image signal is transmitted from the second terminal 11 to the A / D conversion circuit 13
And is digitized by the A / D conversion circuit 3 and a desired one field or frame is written in the first or second image memory 13, 14. Then, the image signals written in the first or second image memories 13 and 14 are read as still image signals one horizontal scanning line at a time and supplied to the 8 mm PCM signal processing circuit 15.
A predetermined recording PCM signal is generated by the CM signal processing circuit 15 and supplied from the changeover switch 5 to the magnetic head 7 via the recording amplifier 6, and as shown in FIG. Each scanning line segment is sequentially recorded in a predetermined segment of each recording track of the magnetic tape 8.

By controlling the switching of the changeover switch 7 by a control unit (not shown), the PCM-converted audio signal and still image signal are supplied to the magnetic head 7 for a predetermined period,
The recording format shown in FIG. 5 is used for segment recording on tracks on the magnetic tape 8. The recording format in this embodiment corresponds to the format of the multi-segment PCM recorder shown in FIG. 7 described above, in which the first audio signal is recorded in the first segment 50 and the first audio signal is recorded in the second segment 60. The still image signal is recorded, and hereinafter, the second audio signal, the fourth audio signal, and the fourth audio signal are recorded in the third segment 70.
Second still image signal in segment 80, fifth segment 90
The third audio signal is recorded in the third segment 100, and the third still image signal is recorded in the sixth segment 100. In the recording format in this embodiment, each segment 50,6
Index area 58,68,78,88,98,1 every 0,70,80,90,100
08 is provided in each guard part so that each index signal can be recorded.

Then, in the block diagram of FIG. 1 showing the main configuration of a reproducing system for reproducing the audio signal and the still image signal from the magnetic tape 8 on which the audio signal and the still image signal are recorded in the recording format as described above, The reproduction output signal reproduced from the magnetic tape 8 by the magnetic head 7 is separated from the reproduction amplifier 20 through the changeover switch 21 into an audio signal portion and an image signal portion and an 8 mm PCM signal processing circuit 22 for the audio signal. It is selectively supplied to the 8 mm PCM signal processing circuit 26 for image signals.

The 8 mm PCM signal processing circuit 22 for the audio signal demodulates the first audio signal sequentially recorded in the predetermined segment (for example, the first segment 50) from the supplied reproduction output signal, and D / The index signal recorded in the index area 58 of the first segment 50 is demodulated and supplied to the control code processing circuit 35 while being supplied to the A conversion circuit 23. Then, the analog audio signal obtained by the D / A conversion circuit 23 is output from the first signal output terminal 25 via the noise reduction (NR) circuit 24.

Further, the 8 mm PCM signal processing circuit 26 for the image signal is
A predetermined segment (for example,
The first still image signal which has been sequentially recorded in the second segment 60) is demodulated, and is selectively supplied to the first to fourth field memories 28, 29, 30, 31 via the first memory switch 27. And the index signal recorded in the index area 68 of the second segment 60 is demodulated and supplied to the control code processing circuit 35. Still image signals for one field are written in the first to fourth field memories 28, 29, 30, 31 selected by the first memory switch 27, respectively. Then, the still image signals written in the first to fourth field memories 28, 29, 30, 31 are selectively read out via the second memory switch 32, and are read by the D / A conversion circuit 33. The analog signal is output from the second signal output terminal 34. The first to fourth field memories 28, 29, 30, 31 are
With the conversion data supplied from the memory processing circuit 36 via the third memory switch 37, the conversion processing can be performed on the content of the still image signal being written.

Further, the control processing circuit 35 is an 8 mm PCM signal processing circuit 25 for the audio signal or an 8 mm PCM signal processing circuit for the image signal.
The control code included in the index signal supplied from the milli PCM signal processing circuit 26 is decoded to control switching of the first to third memory switches 27, 32, 37, that is, the first to third field memories 28. , 29,30,3
The writing / reading control of the still image signal for 1 is performed as shown in FIG. 2, for example.

In Fig. 2, each of the memory switches (S
a, Sb) 27, 28 show the first to fourth field memories 28, 29, 20, 31 selected in this example.
The first to fourth field memories 28, 29, 20, 31 are sequentially selected by the memory switch (Sa) 27 of the magnetic tape 8 every 263 field periods, and the second segment 60 of the recording track of the magnetic tape 8 is selected. The recorded first still image signal is sequentially written one screen at a time. Then, for example, while the still image signal is being written in the first field memory 28, the still image signals for three screens written in the other second to fourth field memories 29, 20, 31 are controlled as described above. The second memory switch (Sb) 28 is selectively read according to the code and the reproduced still image is dynamically switched according to the first audio signal.

By dynamically switching the reproduced still image according to the audio signal as in this embodiment, the still image to be reproduced is synchronized with the audio signal without a monotonous change of the still image with respect to the audio signal. It can have a dynamic effect.

〔The invention's effect〕

As is apparent from the above description of the embodiments, in the magnetic recording / reproducing apparatus according to the present invention, according to the control code recorded on the magnetic tape, the memory control means writes the still image signal to the plurality of field memories of the image reproducing system. By controlling the readout, the reproduced still image can be dynamically switched according to the audio signal, so that the still image to be reproduced is synchronized with the audio signal without the change of the still image becoming monotonous with respect to the audio signal. It can have a dynamic effect.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main configuration of a reproducing system of an embodiment of a magnetic recording / reproducing apparatus according to the present invention, and FIG. 2 is a timing chart for explaining a still image reproducing operation in the reproducing system. FIG. 3 is a block diagram showing a main configuration of the recording system of the above embodiment, and FIG. 4 is a schematic diagram for explaining the recording operation of a still image signal by the recording system, and FIG. The figure is a schematic diagram showing a format of a recording track by the recording system. FIG. 6 is a schematic diagram showing a recording track format of an 8 mm video tape recorder, and FIG. 7 is a schematic diagram showing a recording track format of a multi-segment PCM recorder. 7 ... magnetic head, 8 ... magnetic tape 22,26 ...... 8 mm PCM signal processing circuit 23,33 …… D / A conversion circuit 25,34 …… signal output terminal 27,32 …… memory switch 28,29 , 30,31 …… Field memory 35 …… Control code processing circuit

Claims (1)

[Claims] 1. Recording and reproduction of an encoded audio signal through a first area of a recording track formed on a magnetic tape in a direction oblique to the running direction of the magnetic tape, and recording the same. In a magnetic recording / reproducing apparatus for recording / reproducing a still image signal encoded via a second area of a track, a plurality of field memories for storing still image signals reproduced from the magnetic tape, and recording to the magnetic tape. A magnetic recording / reproducing apparatus comprising: memory control means for controlling writing and reading of a still image signal to and from the plurality of field memories according to a control code stored therein.