JPH025202A - Digital magnetic recording device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a digital magnetic recording device.

[Prior Art] Conventionally, in a digital magnetic recording device, as shown in FIG. After removing noise and differentiating it with a differentiator 6, the waveform shaping circuit 7
The zero cross point was detected as digital data 8.

[Problems and objects to be solved by the invention] However, in such a reproducing circuit, when trying to increase the linear recording density in order to increase the recording capacity of the device, it is necessary to narrow the gap length of the magnetic head and to increase the magnetic material of the recording medium. There has been a problem in that the only methods that involve difficulties in manufacturing technology such as thinning the film are available.

The present invention is intended to solve these problems, and its purpose is to provide a means for increasing the recording capacity of an apparatus by improving the linear recording density.

[Means for Solving the Problems] The digital magnetic recording device of the present invention has a reproducing circuit that combines a circuit that emphasizes the high frequency portion of the reproduced signal band and a so-called all-pass circuit that affects only the phase characteristics. Features.

[Operation] According to the above configuration of the present invention, *
Since the band of the reproduced signal is widened by g, the linear recording density can be increased. In addition, in a normal high frequency emphasizing circuit, distortion occurs in the reproduced waveform due to a change in the phase characteristics, but by making one correction in the full range normal circuit, it is possible to eliminate the distortion.

[Embodiment] FIG. 1 is a block diagram of a reproducing circuit according to an embodiment of the present invention. Recording medium l and magnetic drama, ... Rad 2 +: J,
The signal that is played back is amplified by A/P 3 and a low-pass circuit that emphasizes the high frequencies! ], the phase characteristic nuζdog, −
All-pass 11 □ 11-way 2 Toyo:: J: Corrects the delay characteristics equivalent to 1. The waveform distortion is removed, and the digital data 8 is obtained by the differentiator 6 and the waveform shaping circuit 7. The low-pass circuit 9 and Ji of the all-pass circuit 5 (wave number characteristics Lt are as shown in FIGS. 2(a) and 2(b).The solid line is
The broken line is the characteristic of only the low-pass circuit. Figure 3 is a signal wave shadow diagram of each part of the embodiment. , the waveform has a large interference with the waveformer due to the small number of minutes, but by passing through the high-frequency emphasized low-pass circuit 9, the high frequency of the signal is emphasized, and the low-pass concave output signal 14 has a waveform of 1. The Yuri waveform is distorted due to the distortion of the delay characteristic, which becomes the C waveform as the linear recording density decreases and the linear recording density increases.By passing this through the all-pass circuit 5, , its output 1;5 can take waveform distortion.

This can be constructed by constructing an all-pass circuit (Fig. 4 or 5).

In the above embodiment, the low-pass circuit 9 has the role of emphasizing the high frequency range of No. 16, but in a normal differential amplifier, its characteristics are completely differentiated, and are superior to the sum of the low-pass characteristics. Since there is a ρ1 region in the differentiator, it is also possible to emphasize the ρ1 region of the signal.

It is also possible to have a configuration in which the differentiator +3 is arranged as an /3. Strong, :li,l [,,By correcting the I:9 waveform distortion in the all-pass circuit, the direction of the linear recording density can be increased.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a reproducing circuit according to an embodiment of the present invention. FIG. 2(a) is a characteristic diagram of the number of reproduction times around the gain of the present invention. FIG. 2(b) is a frequency characteristic diagram of delay time of the reproducing circuit of the present invention. FIG. 3 is a diagram of signal waveforms at various parts in an embodiment of the present invention. FIG. 4 is a configuration diagram showing an all-pass circuit used in the present invention. FIG. 5 is a configuration diagram showing another I-11 road passing through the city used in the present invention. Figure 6 is a block diagram of a conventional reproduction circuit. 1
1 Physician Kijibu Hinamoto 1 other person Soen, media Magnetic head amplifier 1 Range pass circuit Full range pass circuit 11 Divider waveform shaping circuit Digital data Fig. (α) Fig. (b) Fig.

Claims (1)

[Claims] A digital magnetic recording device characterized by having a reproducing circuit that combines a circuit that emphasizes the high frequency portion of the reproduced signal band and a so-called all-pass circuit that affects only the phase characteristics.