JPS61194601A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To give compatibility with an in-line head by disposing at least two stagger heads and providing a delay circuit for recording signals recorded by these heads in the same hourly area on a magnetic tape. CONSTITUTION:Recording amplifiers A1-An driving recording heads which record the information signals of the 1st - seventh channels on magnetic tapes are provided. Delay circuits DL2-DLn provided only on the even channels delay the information of each channel by the prescribed time (t), and give it to the recording amplifiers A2-An. The information signal of the odd channel is recorded by the 1st magnetic recording heads M21, while that of the even chan nel is recorded by the 2nd magnetic recording heads M22. The signal of the odd channel arrives at the magnetic recording head M21 earlier by a distance L with respect to the longitudinal direction of the tape. The delay circuits DL2-DLn delay the information signal by the time difference corresponding to the distance L, and record it in the same hourly area of the magnetic tape.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic recording and reproducing device, and more particularly to an improvement in a magnetic recording and reproducing device capable of recording and reproducing information signals of a plurality of channels using a staggered head. .

(Prior Art) A magnetic recording/reproducing device is a device for recording and reproducing information signals on a magnetic tape. In this type of device, multiple channels of information signals are typically recorded on magnetic tape. At this time, as shown in FIG. 5, the magnetic head has recording heads g+ as many as the number of channels (in this case, 4 channels).
-04 is formed (the same applies to the case of the reproducing head). The recording density of a magnetic tape is determined by the number of magnetic tracks recorded in the width direction of the magnetic tape. Therefore, in order to increase the recording density, it is sufficient to increase the number of magnetic tracks.

However, there is a limit to increasing the number of recording heads in one magnetic head due to the difficulty in processing precision of the magnetic head as shown in FIG.

Therefore, as shown in FIG. 6, two magnetic heads M1.
M2 are arranged in the longitudinal direction of the magnetic tape, and these magnetic heads M1. A so-called staggered head is used in which recording heads formed in M2 are provided alternately. This staggered head method can increase the number of magnetic tracks (number of channels) without significantly impairing the electrical characteristics of the magnetic head compared to conventional devices.

(Problems to be Solved by the Invention) By the way, when information signals are recorded in multiple channels using this type of staggered head, there is an unavoidable positional deviation Ll between the heads as shown in FIG. Various problems occur as shown in the following.

■In a magnetic recording/reproducing device having a staggered head for recording information signals as shown in FIG. 6, the same combination of staggered heads Ms as shown in FIG.
t, Mt2 must be used. Therefore, the positional deviation Ll of the playback staggered head M11°Mt2 is also the recording staggered head M! It must be equal to the displacement Ll of 1M2. However, in reality, Ls and Ll are not equal due to mechanical accuracy problems such as processing accuracy or mounting accuracy of the magnetic head.

Furthermore, the mechanical precision of the staggered head will be considered. In the case of stereo signal recording, for example, the tape speed is t*4.8cm/
In the case of a s cassette recorder, if the phase difference between the left (L) and right (R) channels is kept within 90° at 5Kl-12, the mechanical dimensional error of the left and right channels on the tape is approximately 2.5 μm. It is necessary to keep it within. Therefore, when the information signal is reproduced, a reproduction error occurs due to the time difference based on the difference ΔL between Ll and Ll.

When a magnetic tape recorded with the staggered head type magnetic recording/reproducing apparatus of (2)- is reproduced by another staggered head type magnetic recording/reproducing HE apparatus, the same problem as described in (2) occurs. This kind of time difference between the left and right channels during recording and playback is
This appears as a noticeable problem when playing music information, and the sense of realism is lost.

(2) A magnetic tape recorded with a staggered head type magnetic recording/reproducing apparatus cannot be applied to a magnetic recording/reproducing apparatus having an in-line type reproducing head as shown in FIG. That is,
Staggered head magnetic recording and reproducing devices and inline head magnetic recording and reproducing devices are incompatible.

The present invention was made in view of such atrocities, and
The purpose of this is to record multiple channels of information signals by two magnetic recording heads arranged in the longitudinal direction of the magnetic tape.
To realize a magnetic recording/reproducing device capable of recording in an area on a magnetic tape (hereinafter, this area is defined as the same time area) that can be taken out at the same time if reproduced by an in-line head. It is in. FIG. 9 is an explanatory diagram of the simultaneous In area defined here. In the figure, MT is a magnetic tape, and x is the same time area. That is, at the same time fl! 1m11 refers to an area where the width direction of the magnetic tape MT coincides. Therefore, when a magnetic tape on which information signals for each channel are recorded in the same time area is reproduced by an in-line head type magnetic recording/reproducing device, the information signals for each channel can be extracted at the same time.

(Means for Solving the Problems) The present invention, which solves the above-mentioned problems, uses a staggered head as a recording magnetic head in magnetic recording/reproduction a@ for recording and reproducing information signals of a plurality of channels on a magnetic tape. At least two heads are arranged, and a delay circuit is provided so that the signals of each channel recorded by these heads are recorded in the same time area of the magnetic tape.

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

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, Hl to )1n are recording heads for recording the information signals of the first channel to the seventh channel, respectively, on the magnetic tape, and A1 to )1n are the recording heads H, respectively.
This is a recording amplifier that drives 1 to Hn. DL2 to Dt
-n is a delay circuit provided only for even channels.

These delay circuits OL2 to DLn delay the information signal of each channel by a predetermined time t, and the corresponding recording amplifiers A2 to A
It is designed to give n.

FIG. 2 is a diagram showing an example of the configuration of a magnetic head (recording head) used in the apparatus shown in FIG. M21 is the first magnetic recording head, M22 is the second magnetic recording head, H1 to Hη
1 is a recording head formed on the first magnetic recording head M21, H2 to 1-1n are recording heads formed on the second magnetic recording head M22, and these recording heads are the same as the recording heads shown in FIG. Compatible. Information signals of odd channels are recorded by the first magnetic recording head M21, and information signals of even channels are recorded by the second magnetic recording head M22. To explain the operation of the device configured in this way,
It is as follows.

Among the information signals input from each channel, the signals of the odd channels reach the magnetic recording head M21 earlier by the distance in the longitudinal direction of the tape (in the direction of the arrow in FIG. 2). Therefore, if no special processing is performed, the recording state of the magnetic tape will be as shown in FIG. 3, and the recording positions of the odd channel information DI and the even channel information D2 will be different.

Therefore, by delaying the information signal by the time difference corresponding to the distance using the delay circuits DL2 to DLn, it is possible to record the information signal in the same time area on the magnetic tape. here,
The delay time t to be delayed by the delay circuits OL2 to DLn is given by the following equation, where V is the tape speed.

t −L/v That is, each delay circuit DL2 to DLn delays the information signal by the tolerance t expressed by the above equation. The delay time can be adjusted using a semi-fixed resistor as shown in the figure or by other means. Such an analog signal delay circuit can be realized using known technology.

By performing such time adjustment, information of all channels is recorded in one column in the same time area on the magnetic tape MT, as shown in FIG. In addition, the delay circuits DL2 to D
Even if the delay time of each channel is adjusted to 1t in Ln, information may not necessarily be recorded in one column in the same time area of the magnetic tape due to an error in the mounting dimensions of the recording head. In such a case, it is necessary to readjust the delay time of the delay circuit only for the channel that is outside the column.

As described above, according to the invention, since information is recorded in the same column, there is no problem even if the information is reproduced by an in-line head type magnetic recording/reproducing device. According to the present invention, compatibility between staggered head magnetic recording and reproducing devices can be maintained by electrically correcting mechanical errors between staggered heads to inline properties equivalent to those of an inline head.

Further, in the future, when processing technology improves and it becomes possible to form a multi-channel recording or reproducing head in one magnetic head, magnetic tapes will be compatible, which will be convenient.

Note that when the information recorded in this way is reproduced using a staggered magnetic reproducing head similar to that shown in FIG. 2, a time lag occurs in the reproduced signal, so the delay circuit shown in FIG. 1 is used. It is recommended to provide it on the odd-numbered channel side. That is, by providing such a delay circuit, it becomes possible to simultaneously reproduce multi-channel information signals.

In the above description, the case where two staggered heads are arranged is explained as an example, but the present invention is not limited to this, and can be applied in exactly the same way to the case where three or more staggered heads are arranged. However, in this case, it is necessary to set a plurality of delays wI to be delayed in each delay circuit according to the number of staggered heads.

(Effects of the Invention) As explained in detail above, according to the present invention, at least two staggered heads are arranged, and the signals of each channel recorded by these heads are delayed so that they are recorded in the same time area of the magnetic tape. By providing a circuit, mechanical errors between staggered heads can be electrically corrected to inline properties equivalent to those of an inline head, thereby making it compatible with inline heads that will be completed in the future, or Compatibility between staggered head magnetic recording and reproducing devices can be maintained.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram showing one embodiment of the present invention, and FIG.
3 and 4 show examples of information recording on a magnetic tape, FIG. 5 shows an example of the structure of a magnetic head, and FIG. 6 shows an example of the structure of a staggered head. Figure 7 is a diagram showing an example of the configuration of the staggered head, and Figure 8 is 1'.
FIG. 9 is a diagram showing an example of the configuration of an in-line head, and FIG. 9 is a diagram showing an example of information recording on a magnetic tape. Ml, M2. Mll, Ml2. M21. M22...Magnetic head MT...Magnetic tape A~An...Recording amplifier Hz -)1n + (J t-g4-Recording head DL
2 ~ DLn... Delay circuit patent applicant Fuostex Co., Ltd. Representative Patent attorney Fuji Ijima 1 person consultation Figure 2 Figure 3 Shima 4 Figure 5 Figure 6 Inko Figure 7

Claims (1)

[Claims] In a magnetic recording and reproducing apparatus that records and reproduces information signals of multiple channels on a magnetic tape, at least two staggered heads are arranged as recording magnetic heads, and the signals of each channel recorded by these heads are recorded on the same magnetic tape. A magnetic recording/reproducing device characterized by comprising a delay circuit for recording in the time domain.