JP2608102B2 - Rotating head type recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head type recording apparatus, and in particular, records a digital signal divided into channels on a tape while forming a large number of tracks by a plurality of rotary heads. For example, the present invention relates to a rotary head type recording apparatus suitable for a helical scan type digital VTR (video tape recorder).

[Prior Art] Conventionally, in this type of digital recording apparatus, in order to realize recording of a wideband video signal, the relative speed between a magnetic tape and a rotary head is increased as much as possible, and the number of heads provided on a rotary drum is also reduced. I have more than one. In order to increase the relative speed, there is a method of increasing the diameter of the drum. Generally, however, the diameter of the drum is reduced to reduce the size of the entire apparatus, and the number of rotations of the drum is increased to perform segment recording with a plurality of heads. Tend to adopt.

FIG. 11 shows an example of the arrangement of a rotary head used in a conventional digital VTR.

As shown in the drawing, A to H of the rotary head 2 are arranged at 45 ° intervals on the peripheral surface of the drum 1 so that the magnetic tape 3 runs obliquely on the peripheral surface of the drum 1. Therefore, diagonal tracks as shown in FIG. 12 are sequentially formed on the magnetic tape 3.

With the conventional head arrangement shown in FIG. 11, a recording method corresponding to a so-called long-time mode for recording and reproducing a video signal for a longer time on the same tape is considered as follows.

Set the tape feed speed slower than the standard mode.

The recording track pattern when the tape feed speed in the long time mode is half speed
Shown in the figure. FIG. 12 shows the case of the standard mode.
Compared to the figure, the recording track width per channel is 1/2 of the standard recording track width Tp, resulting in a decrease in head output and an increase in the influence of track linearity deviation, which is disadvantageous for compatibility. There was a disadvantage that it was.

Switches the number of recording channels.

For example, for 4-channel recording in the standard mode, the tape feed speed is set to half speed, and the number of divided channels is reduced by half.
Then, two-channel recording is performed.

However, in the above-described conventional example, when the continuity of the track pitch is determined by selecting the recording head, the azimuths of the adjacent tracks become the same. On the other hand, if the recording head is selected such that adjacent channels have reverse azimuth, there is a disadvantage that track pitch discontinuity occurs as shown in FIG.

[Problems to be Solved by the Invention] The inventor of the present application uses a rotary head configuration as shown in FIG. Invented is a rotary head type recording apparatus which has the same recording track width, adjacent channels have reverse azimuth, and can maintain the track pitch continuity of each channel.

To explain the rotary head shown in FIG. 4, eight magnetic recording / reproducing magnetic heads (heads) A to H are provided on the peripheral surface of the rotary drum 1.
2 are arranged at regular intervals at an angle of 45 degrees with respect to the center of the drum. The reference numerals and symbols attached to the right side of the symbols A to H of the heads indicate the head azimuth direction. Reference numeral 4 denotes two of these rotary heads which are 180 degrees apart from each other.
And H, which change the position (height) of the magnetic tape 3 in the rotation axis direction. D and H rotary heads
It is held on the drum 1 via such a piezoelectric element 4,
The height of the head is reduced by the piezoelectric element 4 in the long-time recording mode.

In such a head arrangement, the relative height between the heads is set, and the height of the rotary head is controlled via the piezoelectric element according to the standard and long-time recording modes. FIG. 5 shows the relative height of each head in the standard time recording mode (standard mode). The magnetic tape 3 travels in a state in which the magnetic tape 3 is obliquely wound around the peripheral surface of the drum 1. In the standard mode, the magnetic tape 3 is divided into four tracks in one field as shown in the magnetic recording track pattern in FIG. Recording tracks that are obliquely recorded are sequentially formed.

FIG. 7 shows the relative height of each head in the long-time recording mode. The tape feed speed is V / 2 (tape feed speed V in the standard mode), and recording is performed in two tracks in one field. FIG. 8 shows a recording pattern of a magnetic recording track in the long-time recording mode.

FIG. 9 shows the field division in the standard mode, and FIG. 10 shows the field division in the long-time recording mode.

As described above, in a magnetic recording apparatus in which a wideband digital video signal is recorded on a magnetic tape by a plurality of n rotating heads, a signal is supplied to n / 2 rotating heads in a long-time recording mode, A head configuration comprising a combination of a head and a rotating head held via a piezoelectric element arranged to bend in the width direction of the rotating shaft by supplying a control signal, the height of the rotating head via the piezoelectric element with respect to the rotating head By performing the control, it is possible to secure the same recording track width as that of the standard mode on the recording track pattern, to make the adjacent channel reverse azimuth, and to maintain the continuity of the recording track pitch.

However, in the above-described invention shown in FIGS. 4 to 10, in order to cope with the standard mode and the long-time recording mode with the minimum number of heads, as shown in FIGS. The writing order of the recording tracks has been changed. For this reason, there is a problem to be further improved that the recording order of the digital data of the recording tracks on the magnetic tape 3 is not aligned with the original time series in the longitudinal direction of the tape.

In view of the above-described problems, it is an object of the present invention to provide a rotary head type in which the track forming order is aligned in the time series of digital signals even if the track forming order is not aligned in the longitudinal direction of the tape. It is an object to provide a recording device.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method of recording a digital signal obtained by channel division on a tape while forming a large number of tracks by a plurality of rotating heads, In a rotary head type recording apparatus in which the recording track formation order is different from the arrangement order, storage means for storing the digital signal for each divided channel, and the plurality of recording heads according to the track formation order Read-out means for reading out the digital signal from the storage means at a predetermined timing to arrange the arrangement order of the recording tracks on the tape in a time series of the digital signal.

[Operation] According to the present invention, when recording a digital signal obtained by channel division by a plurality of rotary heads, even if the formation order of recording tracks in the longitudinal direction of the tape is different from the arrangement order, The digital signals to be recorded are temporarily fetched into the memory so that the arrangement order of the recording tracks on the tape is aligned with the time series of the digital signals recorded on the tape, and the digital signals are read from the memory according to the timing pulse according to the track order. Since the signals are taken out and recorded, the digital signals can be arranged in time series on the track pattern of the tape.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a circuit configuration of one embodiment of the present invention. In addition,
The arrangement of the rotary head is the same as that shown in FIG.

In FIG. 1, reference numeral 10 denotes a dividing circuit, which divides a digital signal (such as a wideband video signal) into four in a normal mode and divides it into two in a long-time recording mode according to a recording mode signal. 11 is a memory for temporarily storing the divided digital data, 12 is a modulation circuit for modulating the digital data read from the memory 11, 13 is a recording amplifier (amplifier) for amplifying the modulated data, and a recording amplifier 13 Is amplified and supplied to the corresponding magnetic heads H, A, B and C. Reference numeral 14 denotes a timing circuit for controlling a read timing from the memory 11.

It is assumed that the same circuit as that shown in FIG. 1 is provided for D, E, F, and G heads.

In the circuit configuration shown in FIG.
The field digital signal is divided into four parts in the standard mode and two parts in the long-time recording mode, and the divided signals are loaded into each memory 11. The recording order on the magnetic tape 3 by the magnetic head 2 in the standard mode is such that recording tracks are formed on the magnetic tape 3 in the order of H, A, B, and C heads.

As shown in FIG. 2, the timing of taking out digital data from the memory 11 in the standard mode is performed by the timing circuit 14, and when recording with the H head, the A2 digital data is taken out first and when recording with the A head, Correspond the digital data of A1. Hereinafter, the digital data of A3 is recorded on the magnetic tape 3 by the B head, and the digital data of A4 is recorded on the magnetic tape 3 by the C head. Array.

Next, in the long-time recording mode, recording tracks are formed on the magnetic tape in the order of the H and A heads. The timing of fetching digital data from the memory 11 in the long-time recording mode is also performed by the timing circuit 14, and as shown in FIG. Sometimes, the digital data of A1 is taken out and recorded on the magnetic tape 3.

Therefore, the head configuration shown in FIG. 4 enables both the standard mode recording and the long-time mode recording by controlling the height by the piezoelectric element and changing the number of division channels, and the digital data order in the longitudinal direction of the tape is determined by the recording pattern. It can be aligned on top.

[Effects of the Invention] As described above, according to the present invention, when recording a channel-divided digital signal with a plurality of rotary heads, the order in which the recording tracks are formed in the tape longitudinal direction is different from the arrangement order. Even so, the digital signals to be recorded are temporarily fetched into the memory so that the arrangement order of the tracks recorded on the tape is aligned with the time series of the digital signals, and the digital signals are read from the memory at the timing according to the track formation order. Since the signals are taken out and recorded, the digital signals can be arranged in time series on the track pattern of the tape.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of one embodiment of the present invention, FIG. 2 is a diagram showing a recording pattern in a standard time recording mode of the embodiment of the present invention, and FIG. FIG. 4 is a view showing a recording pattern in a recording mode, FIG. 4 is a plan view showing an arrangement of a rotary head according to an embodiment of the present invention, and FIG. 5 is a diagram showing a relative height of each head used in a standard mode in FIG. FIG. 6 is a diagram showing a recording pattern of a recording track on a magnetic tape in the standard mode when the present invention is not used. FIG. 7 is a diagram showing the relative positions of the respective heads used in the long-time recording mode in FIG. FIG. 8 is a diagram showing a height, FIG. 8 is a diagram showing a recording pattern of a recording track on a magnetic tape in a long-time recording mode when the present invention is not used, and FIG. 9 is a diagram showing field division in a standard mode. Fig. 10 shows a long-time recording mode. FIG. 11 is a plan view showing an example of the arrangement of a rotary head in a conventional apparatus, and FIG. 12 is a view showing a conventional magnetic head in a standard mode using the rotary head shown in FIG. FIG. 13 and FIG. 14 are diagrams showing recording patterns on a magnetic tape in a conventional long-time recording mode using the rotary head of FIG. 1 ... rotating drum, 2 ... head, 3 ... magnetic tape, 4 ... piezoelectric element, 10 ... dividing circuit, 11 ... memory, 12 ... modulation circuit, 13 ... recording amplifier, 14 ... timing circuit.

Claims (1)

(57) [Claims] 1. A digital signal obtained by channel division is recorded on a tape while forming a large number of tracks by a plurality of rotary heads, and the order of forming recording tracks in the longitudinal direction of the tape is different from the arrangement order. In a head-type recording apparatus, a storage unit that stores the digital signal for each divided channel, and by reading the digital signal from the storage unit at a timing according to a track forming order for the plurality of recording heads, A read-out control unit for arranging the arrangement order of the recording tracks on the tape in a time series of the digital signal.