JPH056501A - Rotary magnetic head type magnetic recording and reproducting device - Google Patents

Abstract

PURPOSE:To record and reproduce a signal on plural kinds of magnetic tapes. CONSTITUTION:It is featured that 1/2 and 1/3 inch wide magnetic tapes aa and bb are traveled respectively along the same lead 1A formed on a drum 1 to be in contact with to form tracks having the same track angle alpha respectively, and when the latter is recorded, the recording is performed in compressing the time base by using a time base compressing circuit 26, and when this is reproduced, the reproducing is performed in expanding the time base by using a time base expanding circuit 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary magnetic head type magnetic recording / reproducing apparatus, and more particularly to a dual-purpose machine for selectively using a plurality of types of magnetic tapes having different tape widths.

[0002]

2. Description of the Related Art In recent years, a camera-integrated video tape recorder (hereinafter, "video tape recorder" is simply abbreviated as "VTR") has become widespread so that video shooting can be easily enjoyed at home.

Such a camera-integrated VTR includes a VHS (registered trademark) and an 8 mm video which respectively use magnetic tapes having different tape widths, and a dual-purpose machine capable of selectively using both in one device. As JP-A-63-16
No. 1559, “Magnetic Recording / Reproducing Apparatus”.

That is, in the publication, two types of cassettes are arranged so as to face each other around a drum, and two types of leads having different lead angles are provided on the facing faces of the drums, which face the respective cassettes. It has been proposed to provide two types of loading mechanisms, each of which is formed and loads a magnetic tape corresponding to the above two types of leads.

[0005]

However, the conventional technique has a problem in that it is necessary to form two types of leads on the drum, which makes the drum complicated and expensive. Further, since two types of loading mechanisms are required, there is a problem that the device becomes large and reliability is poor.

Therefore, an object of the present invention is to provide a new device capable of solving the above problems.

[0007]

The present invention provides the following constitution in order to solve the above problems.

In a rotary magnetic head type magnetic recording / reproducing apparatus for recording / reproducing a signal on a plurality of types of magnetic tapes each having a different tape width, the mechanical system of the rotary magnetic head type magnetic recording / reproducing apparatus has a plurality of types of magnetic tapes. And a loading mechanism for respectively winding the plurality of types of magnetic tapes around the drum, and the recording / reproducing circuit system of the rotary magnetic head type magnetic recording / reproducing apparatus includes a plurality of types of the plurality of types of magnetic tapes. Recording and reproducing the signal on the magnetic tape during a period proportional to the different tape widths, and recording and reproducing the signal on the time axis during the period proportional to the different tape widths and reproducing the signal. And extending the time axis to obtain the reproduced signal having the same time axis as the time axis of the signal before recording. Rotating the symptoms magnetic head type magnetic recording reproducing apparatus.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Although the present invention is capable of recording and reproducing using a plurality of types of magnetic tapes having different tape widths, it is a wide tape as an example of a plurality of types of magnetic tapes having different tape widths. The 1/2 inch width magnetic tape and the narrow width 1/3 inch width magnetic tape will be described as an example.

FIG. 1 is a diagram for explaining a loading completion state in the first embodiment of the apparatus of the present invention, and FIG. 2 is 1/3.
FIG. 3 is a view for explaining another loading completion state of the inch width magnetic tape, and FIG. 3 is a front view for explaining the relationship between the 1/2 inch width magnetic tape wound around the drum and the 1/3 inch width magnetic tape. FIG. 4 is a diagram for explaining the respective tape patterns of the 1/2 inch width magnetic tape and the 1/3 inch width magnetic tape, and FIG. 5 is the 1/2 inch width magnetic tape wound on the drum and 1 / inch width magnetic tape. FIG. 6 is a first plan view for explaining the relationship with a 3-inch wide magnetic tape.
FIG. 7 is a block diagram of a recording / reproducing circuit system according to the embodiment, and FIG. 7 is a block diagram of a recording / reproducing circuit system according to the second embodiment.
A first embodiment of an analog VTR and a second embodiment of a dual-purpose machine for an analog VTR and a digital VTR will be described below as one embodiment of the present invention with reference to the drawings. (First Embodiment) First, the loading mechanism, which is the main part of the mechanical system, will be described. Since other known mechanical systems such as the magnetic tape cassette transfer mechanism are known, the description thereof will be omitted.

In FIG. 1, 1 is a drum, 2a and 2b are first and second inclined poles, 3a and 3b are first and second vertical rollers, and 4 and 5 are first and second guide rollers. 6 is a guide groove, 7 is a tension arm, 8 and 9 are first and second magnetic tape pull-out members, AA and BB are first and second cassettes, aa is a 1/2 inch width magnetic tape, and bb is 1 / 3 inch width magnetic tape, C is the drum rotation direction, and D is the magnetic tape running direction.

FIG. 1A shows a 1/2 inch wide magnetic tape a.
2a shows the loading completion state of a, the tension arm 7 and the first and second magnetic tape pull-out members 8 and 9 operate as shown, and the first arm formed integrally with the first inclined pole 2a. The vertical roller 3a and the second vertical roller 3b integrally formed with the second inclined pole 2b are moved while being guided by the guide groove 6 by the rotation of the loading ring mechanism (not shown) to complete the loading. In this way, the 1 stored in the first cassette AA
The 1/2 inch width magnetic tape aa is wound around the drum 1 that rotates in the drum rotation direction C, and is attached to a lead 1A, which will be described later, formed on the drum 1, and regulates the lower end edge of the magnetic tape. Guide rollers 4, 5
Travels in the direction D of the magnetic tape. Further, FIG. 2B shows the loading completed state of the 1/3 inch width magnetic tape bb stored in the second cassette BB, and the above 1/2 inch width magnetic tape aa is shown.
The same loading mechanism is used to perform loading. Then, using the first and second magnetic heads H1 and H2 formed so as to face a rotary drum (not shown) in the drum 1 by 180 degrees, 1/2, 1 /
Video signals and the like are recorded and reproduced on the 3-inch wide magnetic tapes aa and bb.

When recording / reproducing is performed using the 1/3 inch width magnetic tape bb, the guide rollers 4 for controlling the upper end edge of the 1/3 inch width magnetic tape bb on the inlet side and the outlet side of the drum 1. By providing 5 respectively, traveling can be stabilized.

When recording / reproducing using the 1/3 inch width magnetic tape bb, the loading operation is sufficient only by winding the 1/3 inch width magnetic tape bb around the drum 1 about 120 degrees as described later. Therefore, as shown in FIG. 2, the second vertical roller 3b integrally formed with the second inclined pole 2b stops in the middle of the guide groove 6, and
The guide roller 5 may be moved so as to be in contact with the 1/3 inch width magnetic tape bb.

Then, as shown in FIG. 3, 1/2, 1 /
The lower end edges of the 3-inch wide magnetic tapes aa and bb travel while being in contact with the leads 1A having the lead angle θ formed on the drum 1 attached to the drum base 10.

FIG. 4 shows the tape patterns of the 1/2 and 1/3 inch width magnetic tapes aa and bb, respectively. Since the rotational speed of the drum, the lead angle, and the magnetic tape running speed are the same on both magnetic tapes, the track angles α with respect to the longitudinal direction of both magnetic tapes are the same, as shown in the figure. Also, the narrower the magnetic tape, the first and second magnetic heads H.
Since the contact angle range of 1 and H2 is narrowed, the track length of the 1/3 inch width magnetic tape bb is shorter than that of the 1/2 inch width magnetic tape.

Therefore, the effective recording / reproducing range of the magnetic tape is determined by the contact angle range of the first and second magnetic heads H1 and H2, which will be described with reference to FIG. When the effective recording / reproducing range when using the 1/2 inch width magnetic tape aa is the range of 180 degrees shown in the same figure, the range of 120 degrees shown in the figure is effective for the 1/3 inch width magnetic tape bb. It becomes the recording / playback range. The range of 120 degrees is different from the range shown in FIG. 2, but can be realized by stopping the operation of the first vertical roller 3a integrally formed with the first inclined pole 2a. Further, for the 1/4 inch width magnetic tape, the range is 90 degrees as shown in FIG.

Next, the recording / reproducing circuit system will be described with reference to FIG. 6, the system related to the first magnetic head H1 will be described, and the system related to the second magnetic head H2 will be described with reference to the first magnetic head H1. Since it has the same configuration as the system according to the above, the description thereof will be omitted.

First, the recording circuit system will be described. An input video signal Vi is supplied to a recording video signal processing circuit 20 from a signal source such as a VTR (not shown), where the input video signal Vi is input.
Recorded luminance signal 2 obtained by separating the luminance signal and the color signal after performing AGC processing or the like to make the signal level of the signal constant.
0Y and the recording color signal 20C are supplied to the FM modulation circuit 21 and the recording color signal processing circuit 22, respectively. Then, an image FM modulation signal 21 obtained by performing FM modulation in the FM modulation circuit 21.
Y and the recording low-pass conversion color signal 22C obtained by low-pass conversion in the recording color signal processing circuit 22 are supplied to the adding circuit 23,
Here, the addition circuit output signal 23a obtained by adding both is supplied to the contact 241 in the first switch circuit 24.

The first switch circuit 24 and the second switch circuit 28, which will be described later, are used when the 1/2 inch width magnetic tape aa and the 1/3 inch width magnetic tape bb are used in the recording circuit system. Has a role to choose.

That is, when the 1/2 inch width magnetic tape aa is selectively used, the addition circuit output signal 23a is obtained from the contact 241 in the first switch circuit 24 via the movable piece 244 and the contact 243. 1 adder circuit output signal 24b
Moves through the contact 283 in the second switch circuit to the movable piece 2
It reaches the contact 281 via 84 and is supplied to the recording amplifier circuit 29 as the second switch circuit output signal 28a.

On the other hand, when the 1/3 inch width magnetic tape bb is selectively used, the addition circuit output signal 23a is obtained from the contact 241 in the first switch circuit via the movable piece 244 and the contact 242. The adder circuit output signal 24a of
It is supplied to the first A / D conversion circuit 25. Then, the first A / D conversion circuit output signal 25a obtained by analog-digital conversion here is supplied to the time axis compression circuit 26 whose main part is the RAM. The time axis compression circuit 26 has a first A
The / D conversion circuit output signal 25a is temporarily stored in the RAM in units of one field period, and is 1.5 times the write clock frequency used during storage in the period corresponding to the effective recording range (120 degrees) described above. The time axis compression circuit output signal 26a obtained by reading from the RAM using a read clock having a frequency is supplied to the first D / A circuit 27. Then, the first D / A circuit output signal 27a obtained by digital-analog conversion here is supplied to the contact 282 in the second switch circuit and transmitted to the contact 281 via the movable piece 284. The second switch circuit output signal 28a is supplied to the recording amplifier circuit 29.

In this way, the recording process can be performed by selectively using the 1/2 inch width magnetic tape aa and the 1/3 inch width magnetic tape bb.

Then, the recording / reproducing changeover switch circuit for selecting the recording circuit system and the reproducing circuit system by the recording amplifier circuit output signal 29a obtained by amplifying the second switch circuit output signal 28a in the recording amplifier circuit 29. Contact point 402 in 40
Is supplied to. Then, the contact 40 via the movable piece 404.
The recording signal 40a transmitted to the first magnetic head H1 is supplied to the first magnetic head H1 via a rotary transformer (not shown). The first magnetic head H1 has 1/2, 1 /
The recording signal 40a is recorded on the 3-inch wide magnetic tapes aa and bb.

Next, to explain the reproducing circuit system,
A reproduction signal 40b reproduced from the / 2, 1/3 inch width magnetic tapes aa and bb is transferred to a contact 401 in a recording / reproduction changeover switch circuit 40 via a rotary transformer (not shown).
The regenerative amplifier circuit input signal 30b obtained by being transmitted to the contact 403 via the movable piece 404 is supplied to the regenerative amplifier circuit 30. Then, after being amplified here, it is supplied to the contact 311 in the third switch circuit 31 as the reproduction amplifier circuit output signal 30a.

The third switch circuit 31 and a fourth switch circuit 35, which will be described later, select whether the 1/2 inch width magnetic tape aa or the 1/3 inch width magnetic tape bb is used in the reproducing circuit system. Play a role.

That is, when the 1/2 inch width magnetic tape aa is selectively used, the reproduction circuit output signal 30a is obtained from the contact 311 in the third switch circuit 31 via the movable piece 314 and the contact 313. 1 reproduction circuit output signal 31b
Passes through the contact 353 of the fourth switch circuit 35, reaches the contact 351 through the movable piece 354, and is supplied to the separation circuit 36 described below as the fourth switch circuit output signal 35a.

On the other hand, when the 1/3 inch width magnetic tape bb is selectively used, the reproduction circuit output signal 30a is obtained from the contact 311 in the third switch circuit via the movable piece 314 and the second contact 312. The reproduction circuit output signal 31a of
It is supplied to the second A / D conversion circuit 32. Then, the second A / D conversion circuit output signal 32a obtained by analog-digital conversion here is supplied to the time axis expansion circuit 33 whose main part is the RAM. The time axis expansion circuit 33 performs an operation reverse to that of the time axis compression circuit 26 described above.
The A / D conversion circuit output signal 32a of the write clock having the same frequency as the frequency of the read clock used in the time axis compression circuit 26 described above is supplied to the A / D conversion circuit output signal 32a during the period corresponding to the effective recording range (120 degrees) described above. It is temporarily stored in the RAM by using it and the time axis expansion obtained by reading from the RAM by using a read clock having the same frequency as the frequency of the write clock used in the time axis compression circuit 26 in units of one field period. Circuit output signal 33
a is supplied to the second D / A circuit 34. Then, the second D / A circuit output signal 34a obtained by digital-analog conversion here is supplied to the contact 352 in the fourth switch circuit 35 and is transmitted to the contact 351 via the movable piece 353. The fourth switch circuit output signal 35 a is supplied to the separation circuit 36.

In this way, the reproducing process can be performed by selectively using the 1/2 inch width magnetic tape aa and the 1/3 inch width magnetic tape bb.

Then, in the separation circuit 36, the fourth switch circuit output signal 35a is low-frequency-converted with the first separation circuit output signal 36Y related to the video FM modulation signal 21Y, and the recorded low-frequency conversion is recorded. The color signal 22C is frequency-separated into the second separation circuit output signal 36C. Then, the first separation circuit output signal 36Y is the FM demodulation circuit 3
7, and the reproduced luminance signal 37Y obtained by FM demodulation is supplied to the reproduced video signal processing circuit 39. On the other hand, the second separation circuit output signal 36C is supplied to the reproduction color signal processing circuit 38, and the reproduction color signal 38C obtained by high frequency conversion here is supplied to the reproduction video signal processing circuit 39. Then, the reproduced video signal processing circuit 39 reproduces the reproduced luminance signal 37Y.
And the reproduced color signal 38C are mixed and supplied as an output video signal Vo to a television monitor (not shown).

In this way, a recording / reproducing circuit system capable of recording / reproducing by selectively using the 1/2 inch width magnetic tape aa and the 1/3 inch width magnetic tape bb can be realized. (Second Embodiment) In the above-described first embodiment, the analog VTR is described as an example, but the present invention is not limited to the form of the signal recorded on the magnetic tape.
It is also applied to the combined use of digital VTR and analog VTR.

That is, the second embodiment described below is 1/2
When the inch width magnetic tape aa (wide magnetic tape) is used, it is used as an analog VTR, and when the 1/3 inch width magnetic tape bb (narrow magnetic tape) is used, it is used as a digital VTR. Since the mechanical system is the same as that of the first embodiment, the same components are designated by the same reference numerals, and the description thereof will be omitted, and the recording / reproducing circuit system will be described.

The second embodiment will be described with reference to FIG. 7. The same components are designated by the same reference numerals and the description thereof will be omitted. Here, the difference from the first embodiment is that the first and fourth switch circuits 24 and 35 are respectively provided in the last input / output stage, and that the digital recording / reproducing block D surrounded by a dotted line is provided.
That is, R and DP are provided in place of the compression / expansion block having the time axis compression / expansion circuits 26 and 33 as main parts.

First, in the recording circuit system, when the 1/2 inch width magnetic tape aa is selectively used as the input video signal Vi, the input video signal Vi is processed by the first switch circuit 24 to record the video signal. The addition circuit output signal 23a is transmitted to the circuit 20 and subjected to the predetermined recording process described in detail in the first embodiment. On the other hand, 1/3 inch wide magnetic tape b
When b is selectively used, the input video signal Vi is supplied to the digital recording block DR.

The input video signal Vi is analog-to-digital converted by the A / D conversion circuit 50 in the digital recording block DR to be the A / D conversion circuit output signal 50a, which is supplied to the error correction code addition circuit 51. ,here,
The error correction code generated based on the A / D conversion circuit output signal 50a and the synchronization signal are added and then supplied to the modulation circuit 52 as an error correction code addition circuit output signal 51a.

Then, the modulation circuit 52 performs well-known digital modulation, and then temporarily stores it in the RAM in units of one field period, and during storage during the period corresponding to the effective recording range (120 degrees) described above. The modulation circuit output signal 52a is read from the RAM by using a read clock having a frequency 1.5 times the write clock frequency used.
Is obtained and supplied to the recording equalization circuit 53. And
A recording equalization circuit output signal 53a obtained by performing well-known recording equalization so as to previously compensate the peak shift generated in the magnetic recording / reproduction by the recording equalization circuit 53 is supplied to the second switch circuit 28. ..

In this way, the second switch circuit 28
The recording contact equalizing circuit output signal 53a is supplied to the inner contact 282 and the adding circuit output signal 23a is supplied to the contact 283. When the 1/3 inch width magnetic tape bb is selectively used, the former is 1/2. When the inch-width magnetic tape aa is selectively used, the latter is transmitted via the movable piece 284 to each contact 281 and then supplied to the recording amplification circuit 29 as the second switch circuit output signal 28a.

Next, the reproducing circuit system will be described. The reproducing amplifier circuit output signal 30a is a 1/2 inch wide magnetic tape a.
When a is selectively used, the reproduction amplification circuit output signal 30a is transmitted to the separation circuit 36 by the third switch circuit 31,
A predetermined reproduction process similar to that described in detail in the first embodiment is performed to obtain a reproduction video signal processing circuit output signal 39a. On the other hand, when the 1/3 inch width magnetic tape bb is selectively used, the reproduction amplification circuit output signal 30a is supplied to the digital reproduction block DP.

Then, the reproduction amplifier circuit output signal 30a is
The reproduction equalization circuit 54 in the digital reproduction block DP is supplied, and the reproduction equalization circuit output signal 54b obtained by correcting the peak shift accompanying magnetic recording and reproduction is supplied to the demodulation circuit 55. Then, the demodulation circuit 55 performs clock reproduction, and the data at the identification point is discriminated using the reproduction clock obtained by this clock reproduction. The demodulation circuit output signal 55a thus obtained is supplied to the jitter absorption memory 56 having a RAM as a main part, where the jitter is absorbed and the signal compressed by the above-mentioned modulation circuit 52 is before compression. The jitter absorption memory output signal 56a obtained by decompressing the data is supplied to the error correction / correction circuit 57.

Then, the error correction / correction circuit 57 performs error correction by using the error correction code added by the error correction code addition circuit 51 and the synchronizing signal, and makes necessary corrections such as correlation of the video signal. The error correction / correction circuit output signal 57a is obtained by performing the processing based on the above, and this is supplied to the D / A conversion circuit 58. Then, the D / A conversion circuit 58 supplies the digital-analog converted D / A conversion circuit output signal 58 a to the fourth switch circuit 35.

Therefore, the contact 352 in the fourth switch circuit 35 is supplied with the D / A conversion circuit output signal 58a, and the contact 283 is supplied with the reproduced video signal processing circuit output signal 3a.
9a is supplied, and when the 1/3 inch width magnetic tape bb is selectively used, the former is selected when the 1/2 inch width magnetic tape aa is used and the latter is contacted via the movable piece 354.
And the output video signal Vo can be obtained.

In this way, when the 1/2 inch width magnetic tape aa is selectively used, the analog VTR is 1
When the / 3 inch width magnetic tape bb is selectively used, it is possible to provide a dual-purpose machine that can be selectively used as a digital VTR.

In the above embodiment, 1 / 2,1
In the case of selectively using the / 3 inch width magnetic tapes aa and bb, the description has been made on the premise that the rotational speed of the drum, the lead angle and the magnetic tape running speed are the same on both magnetic tapes, but the present invention is not limited to this. , For example, 1/2,
When the 1/3 inch width magnetic tapes aa and bb are selectively used for analog recording / reproducing and digital recording / reproducing, the rotational speed of the drum in digital recording / reproducing is set to 2.5 times that of analog recording / reproducing, and 2. Needless to say, digital recording / reproduction may be performed by using a track pattern having five tracks and having a different track angle from analog recording / reproduction.

In the above-mentioned embodiment, 1 / 2,1
Although the effective recording / reproducing ranges when selectively using the / 3 inch width magnetic tapes aa and bb have been described as 180 degrees and 120 degrees, respectively, the present invention is not limited to this.
For example, it is generally used in a camera-integrated VTR, etc. 1
Of course, it can be applied to a tape having a 1/2 inch tape width and wound by 240 degrees, and needless to say, an effective recording / reproducing angle range proportional to the tape width of the magnetic tape.

In the above-described embodiment, the dual-purpose machine capable of selectively using the 1/2 inch width magnetic tape aa and the 1/3 inch width magnetic tape bb has been described, but the invention is not limited to this. Needless to say, it may be a dual-purpose machine capable of selectively using magnetic tapes having three or more kinds of tape widths.

In the second embodiment described above, 1/2
Inch magnetic tape aa (wide magnetic tape) is used as an analog VTR when selected and used.
When the inch-width magnetic tape bb (narrow width magnetic tape) is selectively used, the case where the inch-width magnetic tape bb is used as a digital VTR has been described as an example, but when the 1 / 2-inch width magnetic tape aa (wide magnetic tape) is selectively used. , First, second, third
The movable pieces 244, 284, 314, 354 in the fourth switch circuits 24, 28, 31, 35 are connected to the contacts 242, 28.
No. 2,312,352 and the frequency of the read clock and the write clock of the RAM provided in the modulation circuit 52 and the jitter absorption memory 56 are set to be the same, whichever magnetic tape is used. Needless to say, may be used as a digital VTR.

In the second embodiment described above, the A / D
The conversion circuit 50 and the error correction addition circuit 51 are not directly connected, but a video signal bit compression circuit for performing band compression such as ADPCM is inserted between them, and the error correction correction circuit 57 and the D / A conversion are performed. It goes without saying that a video signal bit expansion circuit for expanding the band of the signal band-compressed by the video signal bit compression circuit may be inserted between them without directly connecting to the circuit 58.

According to the above-described embodiment, it is possible to arrange a plurality of types of cassettes at overlapping positions without arranging the two types of cassettes so as to face each other around the drum. There is an effect that can be.

According to the above-mentioned embodiment, since the magnetic tapes having a plurality of tape widths are attached to the same lead respectively, it is not necessary to form a plurality of kinds of leads, and the drum can be easily processed. is there.

According to the above-described embodiment, since the magnetic tape having a plurality of tape widths can be loaded on the drum by the same loading mechanism, the device can be downsized and the reliability can be improved. There is.

According to the embodiment described above, the analog VTR
And a digital VTR, it is possible to provide a dual-purpose machine that does not depend on the form of the signal to be recorded / reproduced (analog signal or digital signal). Has the compatibility of being reproducible by a device having each standard, and having the compatibility of being able to reproduce a magnetic tape recorded by a device having each standard on the dual-purpose machine.

[0052]

As described above, according to the configuration of the present invention,
Since magnetic tapes having a plurality of tape widths are attached to the same lead, respectively, it is not necessary to form a plurality of types of leads, and there is an effect that the drum can be easily processed. Further, since the magnetic tape having a plurality of tape widths can be loaded on the drum by the same loading mechanism, there is an effect that the device can be downsized and the reliability can be improved. Further, it is possible to record a plurality of types of magnetic tapes having different standards with a single device, and the recorded plurality of types of magnetic tapes have compatibility such that they can be reproduced by devices having respective standards. is there. Further, there is an effect that the magnetic tape recorded by the device having each standard can be reproduced by the device according to the present invention.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a loading completion state according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining another loading completion state of the 1/3 inch width magnetic tape.

FIG. 3 is a front view for explaining the relationship between a 1/2 inch width magnetic tape wound around a drum and a 1/3 inch width magnetic tape.

FIG. 4 is a diagram for explaining respective tape patterns of a 1/2 inch width magnetic tape and a 1/3 inch width magnetic tape.

FIG. 5 is a plan view for explaining the relationship between a 1/2 inch width magnetic tape and a 1/3 inch width magnetic tape wound around a drum.

FIG. 6 is a block diagram of a recording / reproducing circuit system according to the first example.

FIG. 7 is a block diagram of a recording / reproducing circuit system according to a second example.

[Explanation of symbols]

 1 drum 1A lead 26 time axis compression circuit 33 time axis expansion circuit 52 modulation circuit 56 jitter absorption memory aa 1/2 inch width magnetic tape bb 1/3 inch width magnetic tape α Track angle

Claims (1)

Claim: What is claimed is: 1. A rotary magnetic head type magnetic recording / reproducing apparatus for recording / reproducing signals on / from a plurality of types of magnetic tapes each having a different tape width. Includes a drum having the same lead to which the plurality of types of magnetic tapes are respectively attached, and a loading mechanism for winding the plurality of types of magnetic tapes around the drum, and recording / reproducing of the rotary magnetic head type magnetic recording / reproducing apparatus. The circuit system records / reproduces the signal on / from the plurality of types of magnetic tapes during a period proportional to the different tape widths, and compresses the signal on a time axis during a period proportional to the different tape widths. The recorded data is recorded, reproduced, and expanded on the time axis to reproduce the signal having the same time axis as the time axis of the signal before recording. A rotary magnetic head type magnetic recording / reproducing apparatus characterized by obtaining a recording signal.