Digital reproduced signal processing device

Abstract

A digital reproduced signal processing device is provided with an analog / digital converter (4) that converts an analog reproduced signal which is sampled in a cycle longer than the digital recording channel rate to a low-rate digital reproduced signal with a longer period than that of the recording channel rate, a coefficient setter (6) that performs digital filtering with the low rate and generates a digital equalized signal, an interpolator (7) that interpolates reproduced data of the digital recording channel rate, and a half-rate Viterbi decoder (8) that derives data. The digital reproduced signal processing device of such a constitution can include an analog / digital converter (4) operating with the channel rate even if a digital read channel using PRML is realized. The device comprises reduced digital circuits, operates with a low power consumption, and is manufactured at low cost.

Description

technical field [0001] The present invention relates to a digital reproduction signal processing device, and in particular to a digital reproduction signal processing device used in a reproduction device of a digital recording medium such as an optical disk or a magnetic disk. Background technique [0002] In recent years, technological development for increasing the capacity and high-speed transmission of information recording media such as optical disks and magnetic disks has been advancing. Among them, the example of improving the basic performance related to the information recording medium and the read head for reading information from the information recording medium can be cited, but in addition, the improvement of the basic performance related to the digital reproduction signal processing device can also be cited. Examples of technologies that improve reading accuracy, high-speed work, etc. [0003] The digital reproduction signal processing device uses advanced dig...

AI Technical Summary

Problems solved by technology

[0016] However, there is a problem that the higher the multiplication rate, the higher the frequency of the channel rate, and the higher the frequency, the more difficult it is to realize efficient digital reproduction signal processing.

[0017] First, it is difficult to realize an analog / digital converter operating at high speed when the channel rate has to be high in frequency

For example, even if the high-speed operation of the analog / digital converter can be realized, the power consumption becomes very large

Even for digital circuits, it is a fact that the higher the channel rate, the more difficult it is to realize high-speed digital circuits. Even if high-speed digital circuits are realized, there is a problem that the cost and power consumption increase together for its realization.

[0018] In addition, the power consumption of drives such as HDD and DVD-ROM, even if the double-speed performance is improved, the increase in power consumption cannot be tolerated. Furthermore, the digital signal processing device built in the node-type DEF requires lower power consumption.

[0019] As can be seen from the above, although the existing digital reproduction signal processing device has improved performance and improved reading accuracy, there is a problem that it is difficult to increase the speed due to the increase in power consumption.

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