JPH097104A - Signal recording and reproducing device - Google Patents

Abstract

PURPOSE: To surely stop the bias current of a MR head with a simple constitution at the time of recording a signal. CONSTITUTION: A write permission signal WG is supplied to a recording processing part 21 and a supply part 43. When the signal WG is in a write permission state, a recording signal WS is generated from an input signal WD by the recording processing part 21 and is supplied to the recording head 11. The supply part 43 stops supplying the bias current to a magneto resistance element 12c of the MR head 12. A signal can be recorded on a tape 15 without being influenced by the head 12. When the signal WG is not in a write permission state, generation of the signal WS is stopped and an electric current supply is started to the element 12c. A voltage signal generated across the element 12c in accordance with a signal from the tape 15 is supplied to an amplifier 33 via capacitors 31, 32 and is made to be a read-out signal RS, and a reproducing signal RD is obtained from a reproducing processing part 34. Since generation of the signal WS and supply of the bias current are controlled by the signal WG, the supply of the bias current to the head 12 can surely be stopped by a simple constitution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal recording / reproducing device. Specifically, the generation of the recording signal and the supply of the DC bias current to the reproducing head utilizing the magnetoresistive effect are controlled by the write enable signal, and during the period when the write is enabled based on the write enable signal, the input data is input. A recording signal is generated from the signal and recorded on the recording medium, and the supply of the DC bias current to the reproducing head is stopped to prevent the influence of the reproducing head.

[0002]

2. Description of the Related Art A magnetic recording medium such as a cassette tape or 1 /
4-inch tape cartridge (QIC: Quarter)
A magnetic tape such as -Inch-Cartridge) is used.

When a signal recorded on this magnetic tape is reproduced using a reproducing head utilizing electromagnetic induction,
The signal level of the reproduced signal obtained from the reproducing head is changed according to the strength of magnetization of the magnetic tape and also according to the tape speed of the magnetic tape with respect to the magnetic head.

Therefore, a reproducing head utilizing the magnetoresistive effect (hereinafter referred to as "MR head") so that a reproducing signal having a signal level corresponding to the strength of magnetization of the magnetic tape can be obtained without being influenced by the tape speed of the magnetic tape. ) May be used.

FIG. 2 is a diagram showing the structure of a magnetic head portion using an MR head. In FIG. 2, the magnetic head unit 1
Reference numeral 0 is composed of a recording head 11 and an MR head 12. A coil 11b is attached to the core 11a of the recording head 11, and a magnetic field is generated in the gap 11c by supplying a recording current to the coil 11b, and the magnetic tape is magnetized by the magnetic field to record a signal. It A magnetic field is applied to the magnetoresistive element 12c arranged so as to be sandwiched between the cores 12a and 12b of the MR head 12 according to the magnetization of the magnetic tape when the tape is reproduced. This magnetic field changes the resistance value of the magnetoresistive element 12c. Further, the magnetic resistance element 12c has a current supply terminal 12d,
12e is provided, and the current supply terminals 12d, 1
A DC bias current is supplied to the magnetoresistive element 12c via 2e. Therefore, a voltage signal is generated between the current supply terminals 12d and 12e according to the signal recorded on the magnetic tape.

The magnetic head portion 10 having the above structure
When a signal is recorded on a magnetic tape by using a magnetic tape, the magnetic field generated in the recording head 11 according to the recording signal is not affected by the magnetic field generated in the MR head 12 by the DC bias current during the recording operation. The supply of the DC bias current to the head 12 is stopped.

FIG. 3 shows the structure of a conventional signal recording / reproducing apparatus. In FIG. 3, an input data signal WD and a write permission signal WG are supplied to the data recording processing unit 21, and when the writing of the signal is permitted by the write permission signal WG, based on the input data signal WD. Recording signal WS
Is generated.

The recording signal WS is supplied between the coil terminals 11d and 11e of the recording head 11 via the amplifier section 22. For this reason, a magnetic field based on the recording signal WS is generated in the recording head 11, and the magnetic tape 15 is magnetized by this magnetic field to record a signal.

From the bias supply control section 41, a mode signal MS indicating the operating state of the signal recording / reproducing apparatus is supplied to the bias supply section 42. This bias supply unit 42 has an M
When the current supply terminals 12d and 12e of the R head 12 are connected and it is determined by the mode signal MS that the signal recording / reproducing apparatus is in the "recording mode", the bias supply unit 42 supplies the current supply terminals 12d and 12e. No DC bias current is supplied to the magnetoresistive element 12c via 12e. Therefore, a signal can be recorded on the magnetic tape 15 without being affected by the MR head 12.

When it is determined by the mode signal MS that the signal recording / reproducing apparatus is in the "reproducing mode", the bias supplying section 42 supplies the current supplying terminals 12d, 12 to each other.
A DC bias current is supplied to the magnetoresistive element 12c via e. Therefore, a voltage signal is generated between the current supply terminals 12d and 12e according to the signal recorded on the magnetic tape 15. This voltage signal is applied to the current supply terminals 12d, 12
The read signal RS is supplied to the amplifier unit 33 via the capacitors 31 and 32 connected to e. The read signal RS is supplied to the data reproduction processing section 34. The data reproduction processing section 34 generates a reproduction data signal RD based on the read signal RS.

[0011]

The direct current bias current is supplied based on the mode signal BC supplied from the bias supply controller 41 to the bias supplier 42, and the recording signal WS is generated by writing. It was performed based on the permission signal WG. In this way, the mode signal BC and the write enable signal WG are separately generated, so that the configuration is complicated,
If the timing at which the signal writing is permitted by the writing permission signal WG and the timing at which the supply of the DC bias current is stopped based on the mode signal MS do not match, the signal recorded on the magnetic tape 15 is MR. Head 12
There was a risk of being affected by the magnetic field generated in.

Therefore, the present invention provides a signal recording / reproducing apparatus capable of surely stopping the bias current of the MR head during signal recording with a simple structure.

[0013]

A signal recording / reproducing apparatus according to the present invention magnetically generates a recording signal generated by the signal generating means and a signal generating means for generating a recording signal from an input data signal based on a write enable signal. A recording head for recording on a recording medium, a reproducing head for reading out a signal recorded on a magnetic recording medium by utilizing a magnetoresistive effect, and a bias current supplying means for supplying a DC bias current to the reproducing head, The supply means stops the supply of the DC bias current to the reproducing head based on the write permission signal during the period when the writing is permitted based on the write permission signal.

[0014]

According to the present invention, the signal generating means for generating the recording signal from the input data signal and the bias current supplying means for supplying the DC bias current to the reproducing head utilizing the magnetoresistive effect are controlled based on the write enable signal. During the period in which the writing is permitted based on the writing permission signal, the signal generating unit generates the recording signal from the input data signal and supplies the recording signal to the recording head, and the bias current supplying unit generates the DC bias current. Supply is stopped. Therefore, the recording signal can be recorded on the magnetic recording medium without being affected by the reproducing head.

[0015]

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a diagram showing the configuration of an embodiment of a signal recording / reproducing apparatus according to the present invention. In FIG. 1, FIG.
The same reference numerals are given to the portions corresponding to, and detailed description thereof will be omitted.

In FIG. 1, the write enable signal WG supplied to the data recording processing section 21 is supplied to a bias supply section 43 corresponding to the bias supply section 42 shown in FIG. When the writing of the signal is permitted by the writing permission signal WG, the recording signal WS is generated on the basis of the input data signal WD in the data recording processing section 21 which is the signal generating means.
The recording signal WS is supplied between the coil terminals 11d and 11e of the recording head 11 via the amplifier unit 22. Further, in the bias supply section 43 which is the bias current supply means,
The supply of the DC bias current to the magnetoresistive element 12c is stopped based on the write enable signal WG. Therefore, M
Magnetic tape 1 without being affected by R head 12
The signal is recorded at 5.

When the signal recorded on the magnetic tape 15 is reproduced, the write enable signal WG does not allow the signal to be written, so that the data recording processor 21 stops generating the recording signal WS. To be done. The bias supply section 43 supplies a DC bias current to the magnetoresistive element 12c. Therefore, a voltage signal is generated between the current supply terminals 12d and 12e in accordance with the signal recorded on the magnetic tape 15, and this voltage signal is supplied to the amplifier section 33 via the capacitors 31 and 32 and the read signal RS. And is supplied to the data reproduction processing unit 34, the reproduction data signal R based on the read signal RS from the data reproduction processing unit 34.
D can be obtained.

As described above, according to the above-described embodiment, the generation of the recording signal WS in the data recording processing section 21 and the supply of the DC bias current from the bias supply section 43 to the MR 12 head are caused by the write enable signal WG. Therefore, the supply of the DC bias current to the MR head 12 can be surely stopped with a simple configuration during the signal recording.

Although the magnetic tape is used as the magnetic recording medium in the above embodiment, the magnetic recording medium is not limited to the magnetic tape.

[0021]

According to the present invention, the DC bias current is supplied from the bias current supply means to the reproducing head utilizing the magnetoresistive effect during the period when the writing is permitted based on the writing permission signal. Is stopped based on this write enable signal. Further, since the recording signal is generated from the input data signal by the signal generating means and supplied to the recording head, the signal is recorded on the magnetic recording medium without being affected by the reproducing head. In this way, both the generation of the recording signal and the supply of the DC bias current are controlled based on the write enable signal, so that the supply of the DC bias current to the reproducing head can be reliably stopped with a simple configuration during signal recording. Can be made.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a signal recording / reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing a configuration of a magnetic head unit 10.

FIG. 3 is a diagram showing a configuration of a conventional signal recording / reproducing apparatus.

[Explanation of symbols]

 10 magnetic head part 11 recording head 11a, 12a, 12b core 11b coil 11c gap 11d, 11e coil terminal 12 MR head 12c magnetoresistive element 12d, 12e current supply terminal 15 magnetic tape 21 data recording processing part 22, 33 amplifier part 34 data Reproduction processing unit 41 Bias supply control unit 42, 43 Bias supply unit

Claims (1)

[Claims] 1. A signal generating means for generating a recording signal from an input data signal based on a write enable signal, a recording head for recording the recording signal generated by the signal generating means on a magnetic recording medium, and a magnetoresistive effect. The reproducing head includes a reproducing head for reading out a signal recorded on the magnetic recording medium, and bias current supplying means for supplying a DC bias current to the reproducing head. A signal recording / reproducing apparatus characterized in that the supply of the DC bias current to the reproducing head is stopped on the basis of the write enable signal during the period when the write is allowed based on the above.