KR930003092A - Digital Magnetic Recorder - Google Patents

Abstract

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Description

Digital Magnetic Recorder

Since this is an open matter, no full text was included.

1 is a circuit configuration diagram showing an embodiment in which the undershoot is delayed from the main peak when TFH is reproduced.

2 is an overall configuration diagram showing a magnetic disk device;

3 is a configuration diagram showing a regeneration circuit system;

4 is a diagram showing a relationship between a pole structure and a reproduced isolated waveform in the case of TFH;

5 is a diagram showing a relationship between a structure near a gap and a reproduced isolated waveform in the case of a MIG head;

FIG. 6 is a diagram showing a relationship between a magnetoresistive element, a structure of a shield film, and a reproducing isolated waveform in the case of an MR head; FIG.

Claims (18)

A magnetic recording medium for storing digital information, a magnetic head for reproducing a signal from the magnetic recording medium, a recording and reproducing circuit for extracting binary information from a reproduction signal from the magnetic head, and the magnetic signal according to the reproduction signal from the magnetic head. A magnetic recording and reproducing apparatus having a positioning circuit for positioning the magnetic head at a predetermined position on a recording medium, the magnetic recording and reproducing apparatus comprising: a slimming means of a reproduction signal waveform, a means for compensating a pseudo peak on the traveling side of the reproduction signal waveform, and a reproduction signal waveform. A magnetic recording / playback apparatus having an equalization circuit in which at least two means selected from the means for compensating the pseudo peak on the delay side are connected in series or in parallel. The magnetic recording and reproducing apparatus according to claim 1, wherein the slimming means of the reproduction signal waveform, the means for compensating the pseudo peak on the traveling side, and the means for compensating the pseudo peak on the delay side each have only one delay circuit. . The magnetic recording and reproducing apparatus according to claim 1, wherein the slimming means of the reproduction signal waveform, the means for compensating the pseudo peak on the traveling side, and the means for compensating the pseudo peak on the delay side each have only one differential circuit. . The magnetic recording and reproducing apparatus according to claim 1, wherein the means for compensating the pseudo peak on the advancing side is connected in series with the front end than the means for compensating the pseudo peak on the delay side. The magnetic recording and reproducing apparatus according to claim 1, wherein the slimming means is connected in series with a rear end than a means for compensating the pseudo peak on the traveling side or a means for compensating the pseudo peak on the delay side. The scope of claim 1. The slimming means includes a first delay element for delaying a reproduction signal, an attenuator connected in parallel with the first delay element, a differential circuit for inputting the first delay element output and the attenuator output, and the differential circuit. And a magnetic recording / playback apparatus having a resistance connected to an input on the side of said delay element. The method of claim 1, wherein the means for compensating the pseudo peak on the delay side comprises: means for forming a reverse phase signal of the reproduction signal, delay means for delaying a reverse phase signal of the reproduction signal, and delay of the delay means. A tap selector for selecting the amount, an attenuator for inputting the output of the tap selector, a selector circuit, means for selecting the attenuation amount of the attenuator selector circuit, and an output of the attenuator selector circuit to a reverse phase input, A magnetic recording and reproducing apparatus having a differential amplifier circuit input to a normal input. The method of claim 1, wherein the means for compensating the pseudo peak on the delay side comprises: means for branching the reproduction signal, delay means for delaying the branched reproduction signal, and tap selection for selecting a delay amount of the delay means. Differential amplifier for inputting a circuit, an attenuator selection circuit for inputting the output of the tap selector circuit, means for selecting an attenuation amount of the attenuator selection circuit, and an output of the attenuator selection circuit to an inverted phase input, and a reproduction signal to a normal input; A magnetic recording and reproducing apparatus having a circuit. The apparatus of claim 1, wherein the means for compensating the pseudo peak on the delay side comprises: means for separating the reproduction signal, means for forming a normal output and a reverse phase output from a branched reproduction signal, and the normal output and a reverse phase output. The polarity selection circuit for inputting the signal, the means for selecting the polarity of the output signal of the polarity selection circuit by the polarity of the pseudo peak on the delay side, the delay means for delaying the output signal of the polarity selection circuit, the delay amount of the delay means. A tap selector for selecting, an attenuator selector for inputting the output of the tap selector, means for selecting the amount of attenuation of the attenuator selector, and an output of the attenuator selector for input to a reverse phase input, and a reproduction signal to a normal input A magnetic recording and reproducing apparatus having a differential amplifier circuit for inputting. 2. The magnetic recording and reproducing apparatus according to claim 1, wherein the slimming means is connected in parallel with a means for compensating the pseudo peak on the delay side or a means for compensating the pseudo peak on the traveling side. The system of claim 1, wherein the equalizing circuit forms a first delay element for delaying a reproduction signal, a first attenuator connected in parallel with the first delay element, and a reverse phase signal of the reproduction signal. Means, a second delay element for delaying the reverse phase signal of the reproduction signal, a second attenuator for attenuating the reverse phase signal of the reproduction signal, and a reverse phase signal of the delayed and attenuated reproduction signal to the output of the first attenuator; And a calculating circuit for inputting through a subtracting circuit for subtracting the first delayed element output and performing a calculation with the output of the adding circuit. The apparatus of claim 1, wherein the equalizing circuit comprises: a first delay element for delaying a reproduction signal, means for forming a reverse phase signal of the reproduction signal, an attenuator for attenuating a reverse phase signal of the reproduction signal, and the reproduction And a computing circuit for inputting through a resistor for reflecting a signal and calculating with the output of said attenuator. The magnetic recording and reproducing apparatus according to claim 1, further comprising a low pass filter for inputting a reverse phase signal of the reproduction signal, and inputting the output of the low pass filter to an attenuator. The reproduction circuit of claim 1, wherein the equalizing circuit comprises: means for forming a reverse phase signal of the reproduction signal, means for branching the reproduction signal into a first line and a second line, and a reproduction signal of the first line. A first delay element for delaying the signal, a polarity selection circuit for inputting a reproduction signal of the second line and a reverse phase signal of the reproduction signal, means for selecting the polarity of the output from the polarity selection circuit, and in the polarity selection circuit. A magnetic recording and reproducing apparatus having an attenuator for attenuating an output and an arithmetic circuit for inputting through an attenuator for reflecting the reproduction signal to calculate an output of the attenuator The magnetic recording and reproducing apparatus according to claim 1, further comprising a low pass filter for inputting the output of said polarity selection circuit, and inputting the output of said low pass filter to an attenuator. The method of claim 2, wherein in the delay circuit, a plurality of delay elements having a delay time in a transmission band are connected in series, and a delay time in total is increased by inserting a circuit for compensation of transmission characteristics in the middle. A magnetic recording and reproducing apparatus comprising delay means having good transmission characteristics. A waveform equalizing circuit for processing a signal reproduced by a magnetic head in a magnetic recording medium, comprising: a first delay element for delaying a reproduction signal, a first attenuator connected in parallel with the first delay element, and the first delay element; A first differential circuit for inputting a delay element output of the first attenuator output and a first attenuator output, and a resistor connected to an input side of the first delay element side of the first differential circuit to reflect the reproduction signal; A slimming circuit, means for branching a regenerative signal or a signal of reverse polarity from the reproduction signal, a second delay element for delaying the branched signal, a second attenuator for attenuating the amplitude of the branched signal, delayed and attenuated A waveform equalization circuit in which a pseudo peak compensation circuit composed of a branched signal and a second differential circuit which receives the reproduction signal as an input is connected in series. A first signal line having a third delay element for delaying the reproduction signal, a branching means for branching off a reproduction signal or a signal of reverse polarity thereto, and a third attenuator for attenuating the output of the branching means. A second pseudo peak compensation circuit comprising a second signal line and a second differential circuit subtracting the second signal line output from the first signal line output, wherein the second pseudo peak compensation circuit comprises: Waveform equalization circuit connected in series with slimming circuit and pseudo peak compensation circuit. ※ Note: The disclosure is based on the initial application.