JP3082641B2 - Helical scan type magnetic tape unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical scan type magnetic tape device.

[0002]

2. Description of the Related Art Conventionally, an NTSC signal and a PAL signal digitized by a digital VTR are converted into one video signal.
If it is attempted to record the same number of tracks per frame, it is necessary to change the recording density of the magnetic tape in accordance with the signal, so that there is a disadvantage that two recording systems and two reproduction circuits must be provided. In order to solve this problem, the number of tracks per frame of the video signal is set to 5: 6 for the NTSC signal and the PAL signal, and the format of one track and the drum rotation speed are recorded for both signals. It is known that they substantially match each other, and they have been commercialized as so-called D1 and D3 standard digital VTRs.

On the other hand, Japanese Patent Application Laid-Open No. 5-207507 discloses and suggests a method for recording a digital signal in which the drum rotation speed is twice that of recording an analog video signal.

[0004]

However, D1,
D3 standard digital VTR has a drum rotation speed of 9
Since it is necessary to rotate at a high speed of 4,000 rpm and 4500 rpm, a special rotating drum is required and 1800 rpm
m (1500 rpm for PAL and SECAM signals)
However, there is a drawback that the rotary drum of a consumer VTR that rotates in the above-described manner cannot be used and the configuration becomes complicated.

In the method of doubling the drum rotation speed when recording a digital signal, an NTSC signal and a PAL signal are used.
There are drawbacks such as a need to change the format with the signal (or SECAM signal) and the inability to edit in frame units.

Accordingly, an object of the present invention is to provide a helical scan type magnetic tape device which solves the above-mentioned problems and which can use a rotating drum of a consumer VTR.

[0007]

SUMMARY OF THE INVENTION The present invention provides the following structure to solve the above problems.

According to a first aspect of the present invention, there is provided a magnetic tape wound around a rotary drum by using a first magnetic head pair and a second magnetic head pair which are arranged at 180 ° apart on a rotary drum. In a helical scan type magnetic tape device that performs at least one of recording and reproduction of video information on a track formed obliquely to the direction, the first magnetic head pair or the second magnetic head pair At least one of recording and reproduction is performed by rotating the rotating drum at a first rotation speed for one frame of analog video information per rotation of the rotating drum, and the first magnetic head pair and the second Of the rotating drum using the magnetic head pair of 2.
A helicopter for performing at least one of recording and reproduction by rotating the rotary drum at a second rotation speed of 1.25 times the first rotation speed for one frame of digital video information per five rotations; A calscan magnetic tape device is provided.

According to a second aspect of the present invention, there is provided a magnetic tape wound around a rotary drum using a first magnetic head pair and a second magnetic head pair which are arranged at 180 ° apart on a rotary drum. In a helical scan type magnetic tape device that performs at least one of recording and reproduction of video information on a track formed obliquely to the direction, the first magnetic head pair or the second magnetic head pair At least one of recording and reproduction is performed by rotating the rotating drum at a first rotation speed for one frame of analog video information per rotation of the rotating drum, and the first magnetic head pair and the second Of the rotating drum using the magnetic head pair of 2.
A helicopter for performing at least one of recording and reproduction by rotating the rotary drum at a second rotation speed of 1.5 times the first rotation speed of digital video information for one frame per five rotations. A calscan magnetic tape device is provided.

According to a third aspect of the present invention, there is provided a magnetic tape wound around a rotary drum by using a first magnetic head pair and a second magnetic head pair which are arranged at 180 ° apart on a rotary drum. In a helical scan type magnetic tape device that performs at least one of recording and reproduction of video information on a track formed obliquely to the direction, the first magnetic head pair or the second magnetic head pair At least one of recording and reproduction is performed by rotating the rotating drum at a first rotation speed for one frame of analog video information per rotation of the rotating drum, and the first magnetic head pair and the second Of the rotating drum using the magnetic head pair of 2.
At least one of recording and reproduction is performed by rotating the rotary drum at a second rotation speed of 1.25 times the first rotation speed for one frame of digital video information per 5 rotations, and Digital image information for one frame per 2.5 rotations of the rotating drum using the pair of magnetic heads and the second pair of magnetic heads. It is an object of the present invention to provide a helical scan type magnetic tape device which performs at least one of recording and reproduction by rotating at a rotational speed.

According to a fourth aspect of the present invention, when recording is performed at the second rotation speed, the frequency and the phase are synchronized with each other by 1.25n times (n is a natural number) of the synchronization information separated from the input video information. Wherein the second signal having a frequency of 1 / n times that of the first signal and the rotation phase of the rotary drum are phase-synchronized. A magnetic tape device is provided.

According to a fifth aspect of the present invention, when recording is performed at the second rotation speed, the first and second frequency components are synchronized with the frequency 1.5n times (n is a natural number) of the synchronization information separated from the input video information. A second signal having a frequency 1 / n times that of the first signal and a rotation phase of the rotary drum being phase-synchronized. A magnetic tape device is provided.

According to a sixth aspect of the present invention, when recording is performed at the second rotation speed, the synchronization information separated from the input video information is used as one.
The first signal obtained by dividing the frequency by / 4 and the second signal obtained by dividing the drum pulse representing the rotation phase of the rotary drum by 1/5 are synchronized. It is intended to provide a helicopter scan type magnetic tape device according to the invention of the above.

According to a seventh aspect of the present invention, when recording is performed at the second rotation speed, the synchronization information separated from the input video information is used as one.
A second signal obtained by frequency-dividing a first pulse obtained by frequency-dividing a half of a drum pulse and a second signal obtained by frequency-dividing a drum pulse representing a rotational phase of the rotary drum by one-third. It is intended to provide a helicopter scan type magnetic tape device according to the invention of (1).

According to an eighth aspect of the present invention, a magnetic head mounted on a rotary drum is used to record and reproduce video information on a track formed obliquely to the longitudinal direction of a magnetic tape wound on the rotary drum. A magnetic tape device that performs at least one of the following: at least one of recording and reproduction by rotating the rotary drum at a first rotation speed by rotating analog video information for one frame per rotation of the rotary drum. And rotating the rotary drum at a second rotation speed of 1.25 times the first rotation speed of the digital video information for one frame per 1.25 rotations of the rotary drum to perform recording and reproduction. It is an object of the present invention to provide a helicopter scan type magnetic tape device which performs at least one of them.

A ninth aspect of the present invention is to record and reproduce video information on a track formed obliquely to a longitudinal direction of a magnetic tape wound on the rotary drum by using a magnetic head mounted on the rotary drum. A magnetic tape device that performs at least one of the following: at least one of recording and reproduction by rotating the rotary drum at a first rotation speed by rotating analog video information for one frame per rotation of the rotary drum. And rotating the rotating drum at a second rotation speed of 1.5 times the first rotation speed to record and reproduce digital video information for one frame per 1.5 rotations of the rotating drum. It is an object of the present invention to provide a helicopter scan type magnetic tape device which performs at least one of them.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram for explaining a first embodiment of a helical scan type magnetic tape device according to the present invention, FIG. 2 is a circuit diagram of one embodiment of a drum driving unit, and FIG. FIG. 4 is a timing chart for explaining the operation of the drum driving means, FIG. 5 is a timing chart for explaining the operation of the information recording processing means 5, FIG. 6 is a tape pattern in the D2 mode, FIG. 7 is a diagram showing a tape pattern in the D3 mode, FIG. 8 is a diagram showing a configuration of a rotating drum, and FIG. 9 is a plan view for explaining a mounting position of a head.
Hereinafter, a first embodiment will be described with reference to the drawings.

The outline of the present embodiment is to provide a device which can record and reproduce the format of a consumer VTR and can be conveniently used as a digital VTR by using a mechanical system of a VHS system or an 8 mm system VTR which is one system of a home VTR. Things. That is, recording and reproducing are performed using a mechanism system (rotary drum, tape loading means, etc.) that combines analog video information and digital video information. In particular, when recording and reproducing digital video information, the drum rotation speed is set to 2250 rpm,
One-channel or two-channel recording / reproduction is performed. Thus, in the case of the NTSC signal, recording and reproduction are performed using five tracks per frame, and in the case of the PAL signal or SECAM signal, recording and reproduction are performed using six tracks per frame at the same drum rotation speed. As a result, the number of tracks to be recorded and reproduced per unit time is determined by the NTSC signal and P
This can be shared with the AL (or SECAM) signal, the format within one track can be shared, and frame editing (editing in frame units) becomes possible. The drum rotation speed of 2250 rpm is 1.25 for recording and reproducing analog video information related to NTSC signals.
Since it is 1.5 times that of recording and reproducing analog video information related to a PAL (or SECAM) signal, there is no problem in running the magnetic tape, and it is possible to use the same mechanical system.

This VTR includes an SP mode capable of recording / reproducing for a standard time, an EP mode capable of recording / reproducing for a triple time, and a D1 mode capable of recording / reproducing an information signal in one channel at a first transfer rate. The information signal at a third transfer rate having a rate twice that of the first transfer rate.
It has a D2 mode in which channel recording / reproduction is possible and a D3 mode in which information signals can be recorded / reproduced at a second transfer rate having a rate 1/2 that of the first transfer rate. The tape speed is mainly different between the SP mode and the EP mode. In VHS type VTR, EP
The tape running speed in the mode is 1/3 of the SP mode. Therefore, the track pitch of the inclined track in the EP mode is 1/3 of that in the SP mode.

The VTR according to the first embodiment will be described with reference to FIG. 1. In the SP and EP modes for recording and reproducing an analog video signal and an analog audio signal, the input audio signal aa is transmitted to the audio recording processing means 1. Supplied. The audio recording processing means frequency-modulates the input audio signal aa and supplies it to a head selection means 7 described later. On the other hand, the input video signal bb is supplied to the video recording processing means 2, where the frequency-modulated luminance signal obtained by frequency-modulating the luminance signal of the input video signal bb and the chroma signal of the input video signal bb are A multiplexed signal is output by multiplexing the low-frequency converted chroma signal that has been frequency-converted to a frequency band lower than the frequency-modulated luminance signal band. The multiplex signal is supplied to the head selection means 7. The multiplexed signal and the frequency-modulated audio signal that have passed through the head selection means 7 are supplied to respective heads, and the magnetic tape T
Will be recorded. At the time of reproduction, signals reproduced using the respective heads are supplied to the audio reproduction processing means 3 and the video reproduction processing means 4 via the head selection means 7, respectively. The audio signal processing means 3 frequency-demodulates the reproduction signal input through the head selection means 7 and outputs an output audio signal cc. The video reproduction processing means 4 frequency-demodulates the frequency-modulated luminance signal of the reproduction signal input via the head selection means 7 to obtain a reproduction luminance signal, and converts the low-frequency converted chroma signal of the reproduction signal into the original frequency band. To obtain a reproduced chroma signal, and outputs the reproduced luminance signal and reproduced chroma signal as an output video signal dd.

On the other hand, in the D1 to D3 modes, the input information signal ee is supplied to the information recording processing means 5, where recording processing such as addition of an error correction code according to each mode is performed, and then the output is performed. The signals are supplied to the respective heads via the head selecting means 7, and the signals are recorded on the magnetic tape T. Then, at the time of reproduction, a signal reproduced using each head is supplied to the information reproduction processing means 5 via the head selection means 7 and subjected to reproduction processing such as error correction to generate an output information signal ff.

Here, the operation of the drum driving means 13 according to the gist of the present embodiment will be described in detail with reference to FIGS. First,
The case where the input video signal bb and the input information signal ee are signals related to an NTSC signal having a frame period of 30 Hz will be described.

In FIG. 2, the input video signal bb and the input information signal ee are output from the sync separation circuit 1 in the drum driving means 13.
The frame pulse FP (shown in FIG. 4A) representing the frame period is generated and separated from the input video signal bb and the input information signal ee, and is supplied to one input of the quintuple circuit 140 and the switch circuit 142. Supplied to And 5
The multiplying circuit 140 generates an output signal (shown in FIG. 4B) having a frequency five times that of the frame pulse FP,
The output signal (shown in FIG. 4C) obtained by dividing this output signal by 1/4 in the 1/4 frequency dividing circuit 141 is used as the switching circuit 1
42 to the other input. Thus, 1 /
The output signal of the divide-by-4 circuit 141 is a signal having a frequency 1.25 times the frequency of the frame pulse FP and being synchronized with the frame pulse FP.

The switch circuit 142 is controlled by a third control signal 8c supplied from the control means 8. The third control signal 8c is used in the SP mode or the EP mode for recording and reproducing analog video information. In some cases, the frame pulse FP is selected and output. On the other hand, when the third control signal 8c is in the D1 to D3 mode for recording and reproducing digital video information, the output signal of the 1/4 frequency dividing circuit 141 is selected. Output. The output signal of the switch circuit 142 is supplied to one input of the PLL circuit 143, and is synchronized with the rotating drum supplied to the other input, and a drum pulse DP (FIG. 4E) in which one rotation is one cycle. (Not shown) and the phase of the drum drive signal 13 so that the phases of the two are synchronized.
a is generated. This phase comparison is performed by generating a crunchy wave signal shown in FIG. 4D based on the output signal of the switch circuit 142, sampling and holding this with a drum pulse DP, and then passing through a loop filter.

As described above, in the SP mode or the EP mode, the rotation period of the rotating drum coincides with the frame period,
On the other hand, in the D1 to D3 modes, the rotation period of the rotary drum is 1.25 times the frame period. That is, in the SP mode or the EP mode, the rotating drum is rotated at 1800 rpm, and in the D1 to D3 modes, the rotating drum is rotated at 2250 rpm.
It is rotating with.

Next, the input video signal bb and the input information signal e
If e is a signal related to a PAL signal having a frame period of 25 Hz, the quintuple circuits 140 and 1
By changing the ４ frequency divider circuit 141 to a 逓 frequency divider circuit and a 分 frequency divider circuit, a signal having a frequency 1.5 times that of the frame pulse FP is generated, and D1 to D3
In the mode, the drum drive signal 13a is generated by comparing the phase of this signal with the drum pulse DP. As a result, in the SP mode or the EP mode, the rotation period of the rotating drum coincides with the frame period, while in the D1 to D3 modes, the rotation period of the rotating drum becomes 1.5 times the frame period. That is, in the SP mode or the EP mode, the rotating drum is rotated at 1500 rpm, and in the D1 to D3 modes, the rotating drum is rotated at 2250 rpm.

Another example of the drum driving means 13 will be described with reference to FIG. 3. The same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. FIG. 3 shows that the input video signal bb and the input information signal ee have a frame period of 30 Hz.
This is a case where the signal is related to the SC signal. In the figure,
In the SP mode or the EP mode, the switch circuits 142, 1
At 44, the frame pulse FP and the drum pulse DP are selected, and the PLL circuit 143 compares the phases.
On the other hand, in the D1 to D3 modes, the switch circuit 142 selects the output signal of the 分 frequency divider 141 having a frequency of １ ／ of the frame pulse FP, and the switch circuit 144 selects の of the drum pulse DP. The output signal of the 1/5 frequency divider 145 having the frequency of
The phase comparison is performed by the L circuit 143. In this manner, the rotation of the rotating drum can be controlled in the same manner as the drum driving means 13 shown in FIG. Note that the 1/4 frequency divider 141 and the 1/5 frequency divider 145 are respectively referred to as a 1/2 frequency divider and a 1/3 frequency divider.
By changing to a frequency dividing circuit, it is possible to cope with a case where the input video signal bb and the input information signal ee are signals related to a PAL signal having a frame period of 25 Hz.

The operation of the head selecting means 7 will now be described with reference to Table 1 below. In Table 1, "V"
Represents recording and reproduction of video, "A" represents recording and reproduction of audio, and "D1,""D2," and "D3" represent D1 through D3.
This means that information relating to the three modes is recorded and reproduced, respectively.

[0029]

[Table 1] First, the SP and EP modes will be described. In the SP mode, the heads A1, A2,
After selecting S1 and S2 and recording and reproducing audio using the preceding heads A1 and A2, deep recording and reproduction are performed using the following heads S1 and S2 to record and reproduce video.
In the EP mode, the head A
1, A2, E1, E2, and the preceding head A1,
After recording and reproducing sound using A2, the following head E
Deep recording / reproduction for recording / reproducing a video is performed using E1 and E2.

The recording mode is selected between the SP mode and the EP mode by operating the input means 9 by an operator, and the output signal is supplied to the control means 8. The control means 8 outputs a first control signal 8a to the head selection means 7 based on the output signal so as to select a head shown in Table 1, and generates a second control signal 8b for controlling the tape driving means 10. Then, the tape driving means 10 outputs the second control signal 8
If b represents the EP mode, 1 /
The magnetic tape T is run at three times the tape running speed. On the other hand, at the time of reproduction, a control signal synchronized with the input video signal bb at the time of recording is reproduced using the control head H, and this is subjected to reproduction processing such as waveform shaping by the CTL recording / reproduction means 11 to generate a reproduction control signal 11a. It has gained. Then, the control means 8 controls the reproduction control signal 11
By detecting the frequency of a, the magnetic tape becomes SP
It is determined whether the data is recorded in the mode or the EP mode, and the second control signal 8b is generated according to the result of the determination.

Next, the D1-D3 modes will be described. In the D1 mode, the head selection means 7 selects the heads A1 and A2, and performs one-channel recording and reproduction of information. The heads E1, E having an azimuth angle of ± 6 °
2 can be used, but since the azimuth angles of the heads A1 and A2 are ± 30 °, which is larger than those of the heads E1 and E2, the use of the heads A1 and A2 can prevent crosstalk. As an application example of the D1 mode, it may be applied to a DBS having a transfer rate of 10 Mbps using MPEG2 which is being studied in Europe. In this case, D2, D
Since the recording capacity per channel is set to approximately 14.5 Mbps in relation to the application example of the three modes, it is 4.5 Mbps.
Since there is room for s, recording and reproduction are performed by inserting 0 data or other information.

In the D2 mode, the head selecting means 7
To select heads A1 and A2 and heads E1 and E2, and perform two-channel recording and reproduction of information. As an application example of the D2 mode, 29 Mbps digital video information obtained by band-compressing the NTSC signal or the PAL / SECAM signal corresponds to the D2 mode.
In the case of the NTSC signal, five tracks are used at 1.25 rotations of the rotating drum per frame, and PAL / SEC is used.
The AM signal is recorded and reproduced using six tracks at 1.5 rotations of the rotating drum per frame.

In the D3 mode, the head selecting means 7
To select head A1 and head E2, and perform interval recording and reproduction of information. As an application example of the D2 mode, the present invention may be applied to a DTV having a transfer rate of 7 Mbps using MPEG2, which is being studied in the United States. In this case, the recording capacity per channel is set to approximately 7.25 Mbps in relation to the application example of the D1 and D2 modes.
Since there is a margin of 0.25 Mbps, recording / reproduction is performed by inserting 0 data or other information.

The selection of the D1-D3 mode at the time of recording is performed by the control means 8 identifying an identification signal (ID information) substantially representing the transfer rate inserted in the input information signal ee. . That is, the control means 8 generates the first and second control signals 8a and 8b based on the identification signal. On the other hand, in the reproduction mode selection in the D1 to D3 modes, the control means 8 generates the first and second control signals 8a and 8b based on the identification signal inserted in the output information signal ff. Then, when the second control signal 8b indicates the D1 mode, the tape driving means 10 causes the magnetic tape T to run at a magnetic tape running speed of 1/2 of the SP mode, and
When the second control signal 8b indicates the D2 mode, the magnetic tape T is caused to run at the same magnetic tape running speed as the SP mode, and when the second control signal 8b indicates the D3 mode, the magnetic tape T is driven.
The magnetic tape T is caused to travel at a magnetic tape traveling speed of 1/2 of one mode, that is, 1/4 of SP mode.

The operation of the information recording processing means 5 will now be described with reference to FIG. FIG. 3A shows an input information signal ee.
FIG. 8B shows a synchronization signal synchronized with the rotation of the heads E1 and E2. When this signal is at a high level, the head E1 is in contact with the magnetic tape T, and when the signal is at a low level, Indicates that the head E2 is in contact with the magnetic tape T. FIG. 3C shows a synchronization signal which is synchronized with the rotation of the heads A1 and A2 which are mounted 120 ° ahead of the heads E1 and E2. The head A2 is in contact with the magnetic tape T during the low level period. The input information signal ee shown in FIG.
Is a third transfer rate having a rate twice the transfer rate of the third transfer rate.

In the case of the D1 mode, the data a1, b1... In the timing sequence shown in FIG.
Are supplied to the head A2, and the data a3, b3,... Are supplied to the head A1 in the timing sequence shown in FIG. As a result, information of 1/2 of the input information signal ee, that is, information corresponding to the first transfer rate can be recorded and reproduced on one channel.

In the case of the D2 mode, the head A
1 and A2, the data a1, a3, b1, b3,... Are recorded at the timings shown in FIGS. 3D and 3E, and the data a4, b4 are recorded in the timing order shown in FIG.
Are supplied to the head E1 and data a2, b2,... Are supplied to the head E2 in the timing sequence shown in FIG. As a result, the input information signal ee corresponding to the third transfer rate can be recorded and reproduced on two channels. The magnetic tape pattern in the D2 mode is as shown in FIG.

Further, in the case of the D3 mode, FIG.
Are supplied to the head A1 in the timing sequence shown in FIG. 4 and the data b1... Are supplied to the head E2 in the timing sequence shown in FIG. As a result, information of 1/4 of the input information signal ee, that is, information corresponding to the second transfer rate can be recorded and reproduced at intervals. The magnetic tape pattern in the D3 mode is as shown in FIG.

Recording or reproduction of the analog video signal or information signal described above is realized by the rotary head and head configuration shown in FIG. 8 and the head mounting position shown in FIG. In the above-described head configuration, the head E1 and the head S2 are adjacent, the head E2 and the head S1 are adjacent,
The heads E1 and S2 are connected to the heads E2 and S1.
Are attached to the rotating drum 100 so as to face each other by 180 °. Thus, the above-described SP mode, EP mode, and D1 to D3 modes can be realized.
Variable speed reproduction can be performed well.

Thus, according to the first embodiment,
Since another track is formed by the second magnetic head pair between the tracks formed by the first magnetic head pair, not only the overwriting recording or reproduction but also one channel or two channels without additional heads. There is an effect that the recording or reproduction of the data can be performed. Further, since it is not necessary to greatly increase the rotation speed of the rotating drum during recording or reproduction, stable magnetic tape running can be realized without using a special tape tension control device, and as a result, recording or recording without signal deterioration is achieved. There is an effect that reproduction can be achieved with a simple configuration. Further, when the present apparatus is applied to digital recording or reproduction, there is an effect that only one reproduction equalization circuit is required.

Next, FIG. 10 is a block diagram for explaining a second embodiment of the helical scan type magnetic tape device according to the present invention, FIG. 11 is a diagram showing a configuration of a rotary drum, and FIG.
2 is a plan view for explaining the mounting position of the head, FIG.
14 is a timing chart for explaining the operation of the information recording processing means 55, FIG. 14 is a tape pattern in the D2 mode, and FIG. 15 is a tape pattern in the D3 mode. Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

In FIG. 10, H1, H2, H3 and H
Reference numeral 4 denotes a dedicated head for recording and reproducing information signals such as digital video signals. In this embodiment, the SP mode and E
In the P mode, the operation is the same as that of the first embodiment, and the description is omitted. In the D1 to D3 modes, the input information signal ee is supplied to the information recording processing unit 55, where the recording process is performed in accordance with each mode. H2
The information signal is supplied to H3 and H4, and an information signal is recorded on the magnetic tape T. At the time of reproduction, the respective heads H1, H
2, the information signal reproduced using H3 and H4 is supplied to the information reproduction processing means 65 via the head selection means 71, and subjected to reproduction processing to generate an output information signal ff.

FIG. 11 shows the structure of the rotary drum and the head used in the second embodiment. FIG. 12 shows the mounting position of each head. The heads H1 and H3 are mounted adjacent to the heads H2 and H4, respectively. Head H
2 and H4, the lower ends of which are approximately 2 degrees with the lower ends of the heads H1 and H3.
It has a step of 9 μm. The width of the heads H1 and H3 is 2
Smaller than 9 μm. Heads H1 and H3 are attached to the rotating drum
Heads H2, H4
Are mounted 180 ° opposite to the rotating drum.

Table 2 is a table for explaining the operation of the head selecting means 71. In the SP mode and the EP mode, the analog video signal and the analog audio signal
Recording and reproduction are performed using 1, 1, S2, E1, E2, A1, and A2 in the same manner as in the first embodiment. In the D1 to D3 modes, information signals are recorded and reproduced using the heads H1 to H4.

In the D1 mode, the head selecting means 7
At 1, the heads H1 and H3 are selected, and recording and reproduction of information signals are performed. In the D2 mode, heads H1, H2, H3, and H4 are selected by the head selection means 7, and two-channel simultaneous recording and reproduction of an information signal is performed. In the D3 mode, the head H1 is selected by the head selecting means 7, and the information signal is recorded and reproduced at intervals.

Next, the operation of the information recording processing means 55 will be described with reference to FIG. A case where a digitized input information signal is input to the information recording processing means 55 will be described. FIG. 13A shows the input information signal ee. FIG.
(B) is a pulse synchronized with the rotation of the heads H1 to H4. While this pulse is at the low level, the heads H1 and H2
Are in contact with the magnetic tape T, while the heads H3 and H4 are in contact with the magnetic tape T during the high level period.
Note that the input information signal ee shown in FIG.
Is a third transfer rate having a rate twice the transfer rate of the third transfer rate.

In the case of the D1 mode, FIG.
The data a1, b1,... In the timing order shown in FIG.
Are supplied to the head H1, and data a3, b3,... Are supplied to the head H3 in the timing sequence shown in FIG. As a result, information of 入 力 of the input information signal ee, that is, the input information signal corresponding to the first transfer rate can be recorded and reproduced on one channel.

In the case of the D2 mode, the head H
1 and H3, the data a1, a3, b1, b3,... Are recorded at the timings shown in FIGS. 13 (C) and 13 (D), and the data a in the timing order shown in FIG.
Are supplied to the head H2, and FIG.
Are supplied to the head H4 in the timing sequence shown in FIG. As a result, the input information signal ee corresponding to the third transfer rate can be simultaneously recorded and reproduced on two channels. In the D2 mode, the track pattern is
As shown in FIG.

Further, in the case of the D3 mode, FIG.
The data a1, b1,
are supplied to the head H1. As a result, information of 1/4 of the input information signal ee, that is, the input information signal corresponding to the second transfer rate can be recorded and reproduced at intervals. D3
In the mode, the track pattern is as shown in FIG.

Thus, according to the second embodiment,
Since it is not necessary to greatly increase the rotation speed of the rotating drum when recording or reproducing information signals, the information signals are recorded or reproduced on the rotating drum provided with a head for recording or reproducing analog video signals and analog audio signals. Can be arranged, and stable magnetic tape running can be realized without using a special tape tension control device. As a result, recording or reproduction without signal deterioration can be achieved with a simple configuration. Play.

In each of the above embodiments, the helical scan type magnetic recording / reproducing apparatus has been described as an example.
The device may be simply a helical scan type magnetic tape device, as long as it can perform either recording or reproduction.

[0052]

As described above, according to the configuration of the present invention, the first magnetic head pair and the second magnetic head pair are used for one frame per 2.5 rotations of the rotating drum. Minute digital image information is rotated at a second rotation speed of 1.25 times the first rotation speed to perform at least one of recording and reproduction, so that an NTSC signal having a frame cycle of 30 Hz is obtained. The digital video information can be recorded and reproduced using five tracks per frame, and the analog video information can be recorded and reproduced. In addition, when recording and reproducing digital video information, it is sufficient to increase the rotation speed of the rotary drum by only 1.25 times as compared with the recording and reproduction of analog video information. There is an effect that video information can be recorded and reproduced. Furthermore, since recording / reproduction is performed using five tracks per frame, there is also an effect that editing on a frame basis becomes possible.

Further, according to the configuration of the present invention described in claim 2, as described above, the first magnetic head pair and the second magnetic head pair
The digital image information of one frame per 2.5 rotations of the rotating drum is transferred to the rotating drum by the first magnetic head pair.
Is rotated at a second rotation speed 1.5 times the rotation speed of at least one of recording and reproduction, so that 25H
The digital video information relating to the PAL signal or SECAM signal having a frame period of z can be recorded and reproduced using six tracks per frame, and the analog video information can be recorded and reproduced. Also,
In recording and reproducing digital video information, it is sufficient to increase the rotation speed of the rotary drum by 1.5 times compared to the recording and reproduction of analog video information. This has the effect that recording and reproduction can be performed. In addition, 6 per frame
Since recording and reproduction are performed using a track of a book, there is also an effect that editing in frame units becomes possible.

According to the third aspect of the present invention, as described above, in addition to the effects of the first and second aspects of the present invention, the digital video information relating to the NTSC signal and the PAL signal is shared. There is an effect that recording and reproduction can be performed by using the rotating drum. Further, according to the configuration of the present invention described in claim 4 or 6, as described above, in addition to the effect of the present invention described in claim 1, an effect that specific control of the rotary drum can be provided. is there.

According to the configuration of the present invention described in claim 5 or 7, as described above, in addition to the effect of the present invention described in claim 2, it is possible to provide specific control of the rotary drum. This has the effect.

Further, according to the configuration of the present invention, one frame of analog video information per rotation of the rotary drum is rotated at the first rotation speed for recording and reproduction. Do at least one of them, and
Digital image information for one frame per 1.25 rotations of the rotating drum is transferred to the rotating drum at a first rotation speed of 1.25.
Since at least one of recording and reproduction is performed by rotating at twice the second rotation speed, it is possible to record and reproduce an analog video signal and digital video information related to an NTSC signal having a frame period of 30 Hz. In addition, when recording and reproducing digital video information, it is sufficient to increase the rotation speed of the rotating drum by only 1.25 times as compared with the recording and reproduction of analog video information. There is an effect that digital video information can be recorded and reproduced.

According to the ninth aspect of the present invention, one frame of analog video information per one rotation of the rotary drum is rotated at the first rotation speed for recording and reproduction. Do at least one of them, and
At least one of recording and reproduction is performed by rotating the rotating drum at a second rotation speed of 1.5 times the first rotation speed of the digital video information for one frame per 1.5 rotations of the rotating drum. Therefore, it is possible to record and reproduce an analog video signal and digital video information related to a PAL signal or a SECAM signal having a frame period of 25 Hz.
In addition, when recording and reproducing digital video information, it is sufficient to increase the rotation speed of the rotary drum by only 1.5 times as compared with the recording and reproduction of analog video information. There is an effect that digital video information can be recorded and reproduced.

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining a first embodiment of a helical scan type magnetic tape device according to the present invention.

FIG. 2 is a circuit diagram of one embodiment of a drum driving unit.

FIG. 3 is a circuit diagram of another embodiment of the drum driving means.

FIG. 4 is a timing chart for explaining the operation of the drum driving means.

FIG. 5 is a timing chart for explaining the operation of the information recording processing means 5;

FIG. 6 is a tape pattern in a D2 mode.

FIG. 7 is a tape pattern in a D3 mode.

FIG. 8 is a diagram showing a configuration of a rotating drum.

FIG. 9 is a plan view for explaining a mounting position of a head.

FIG. 10 is a block diagram for explaining a second embodiment of the helical scan type magnetic tape device according to the present invention.

FIG. 11 is a diagram showing a configuration of a rotary drum.

FIG. 12 is a plan view for explaining a mounting position of a head.

13 is a timing chart for explaining the operation of the information recording processing means 55. FIG.

FIG. 14 is a tape pattern in the D2 mode.

FIG. 15 is a tape pattern in the D3 mode.

[Explanation of symbols]

 13 Drum drive means S1, S2 Magnetic head E1, E2 Magnetic head A1, A2 Magnetic head H1, H2, H3, H4 Magnetic head T Magnetic tape

[Table 2]

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI H04N 9/804 H04N 9/80 A 9/808

Claims (9)

(57) [Claims] A first magnetic head pair and a second magnetic head pair, which are disposed on a rotating drum at a distance of 180 °, with respect to the longitudinal direction of a magnetic tape wound around the rotating drum. In a helical scan type magnetic tape device for performing at least one of recording and reproduction of image information on a track formed in an oblique direction, an analog of one frame per one rotation of the rotary drum using the first magnetic head pair. The video information is rotated at a first rotation speed to perform at least one of recording and reproduction, and using the first magnetic head pair and the second magnetic head pair to rotate the rotating drum. Digital video information for one frame per 1.25 revolutions is transferred to the rotating drum at a first rotational speed of 1.2 frames.
A helical scan type magnetic tape device which performs at least one of recording and reproduction by rotating at a second rotation speed five times as high. 2. A longitudinal direction of a magnetic tape wound on a rotating drum using a first magnetic head pair and a second magnetic head pair disposed at 180 ° apart on a rotating drum. In a helical scan type magnetic tape device for performing at least one of recording and reproduction of video information on a track formed in a diagonal direction, the first magnetic head pair and the second magnetic head pair are used to form one of the rotating drums. At least one of recording and reproduction is performed by rotating the rotary drum at a first rotation speed for one frame of analog video information per rotation, and the first magnetic head pair and the second magnetic head pair By rotating the rotary drum at a second rotation speed of 1.5 times the first rotation speed, the digital video information for one frame per 1.5 rotations of the rotary drum is used for recording and reproduction. A helicopter scan type magnetic tape device characterized by performing at least one. 3. A longitudinal direction of a magnetic tape wound on a rotary drum by using a first magnetic head pair and a second magnetic head pair disposed at 180 ° apart on a rotary drum. In a helical scan type magnetic tape device for performing at least one of recording and reproduction of image information on a track formed in an oblique direction, an analog of one frame per one rotation of the rotary drum using the first magnetic head pair. The video information is rotated at a first rotation speed to perform at least one of recording and reproduction, and using the first magnetic head pair and the second magnetic head pair to rotate the rotating drum. Digital video information for one frame per 1.25 revolutions is transferred to the rotating drum at a first rotational speed of 1.2 frames.
At least one of recording and reproduction is performed by rotating at a second rotation speed of 5 times, and the rotating drum is rotated 1.5 times using the first magnetic head pair and the second magnetic head pair. Wherein at least one of recording and reproduction is performed by rotating the rotary drum at a third rotation speed of 1.5 times the first rotation speed for one frame of digital video information per one frame. Type magnetic tape unit 4. When recording at the second rotation speed,
1.25n times (n) of the synchronization information separated from the input video information
Is a positive integer) and a second signal having a frequency that is 1 / n times that of the first signal.
2. The helical scan type magnetic tape device according to claim 1, wherein the phase of the signal is synchronized with the rotation phase of the rotary drum. 5. When recording at the second rotation speed,
Generates a first signal synchronized with a frequency of 1.5n times (n is a positive integer) of the synchronization information separated from the input video information and has a frequency of 1 / n times the first signal. 3. The magnetic tape device according to claim 2, wherein the second signal and the rotation phase of the rotary drum are phase-synchronized. 6. When recording at the second rotation speed,
A first signal obtained by dividing the synchronization information separated from the input video information by １ ／ and a second signal obtained by dividing the drum pulse representing the rotation phase of the rotating drum by １ ／ are obtained. 2. The helicopter scan type magnetic tape device according to claim 1, wherein the phase is synchronized. 7. When recording at the second rotation speed,
A first signal obtained by dividing the synchronization information separated from the input video information by １ ／, and a second signal obtained by dividing the drum pulse representing the rotation phase of the rotating drum by ３ are obtained. 3. The magnetic tape device according to claim 2, wherein the phase is synchronized. 8. At least one of recording and reproduction of video information on a track formed obliquely to a longitudinal direction of a magnetic tape wound on the rotary drum using a magnetic head mounted on the rotary drum. And performing at least one of recording and reproduction by rotating the rotary drum at a first rotation speed with respect to one frame of analog video information per rotation of the rotary drum, and The digital image information for one frame per 1.25 rotations of the rotating drum is transferred to the rotating drum at a first rotation speed of 1.25.
A helical scan type magnetic tape device which performs at least one of recording and reproduction by rotating at a double second rotation speed. 9. At least one of recording and reproduction of video information on a track formed obliquely to a longitudinal direction of a magnetic tape wound on the rotary drum using a magnetic head mounted on the rotary drum. And performing at least one of recording and reproduction by rotating the rotary drum at a first rotation speed with respect to one frame of analog video information per rotation of the rotary drum, and At least one of recording and reproduction is performed by rotating the rotary drum at a second rotation speed of 1.5 times the first rotation speed, for one frame of digital video information per 1.5 rotations of the rotation drum. A helical scan type magnetic tape device characterized by performing.