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Input sampling circuit and method for processing optical disc read signal

A technology of input sampling and circuit, which is applied in recording signal processing, information storage, recording information storage, etc., and can solve the problems such as the influence of circuit chip size and power consumption

Active Publication Date: 2009-10-14
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Combining the above factors, the analog-to-digital converter will have a negative impact on the die size and power consumption of the optical drive system

Method used

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  • Input sampling circuit and method for processing optical disc read signal
  • Input sampling circuit and method for processing optical disc read signal
  • Input sampling circuit and method for processing optical disc read signal

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Embodiment Construction

[0018] Please refer to figure 1 , figure 1 It is a schematic diagram of a first embodiment of a part of the input sampling circuit 100 of the present invention. figure 1 The input sampling circuit 100 is used to process an optical disc reading signal DRB read by a head in the optical disc drive system to generate a digital signal D1. The input sampling circuit 100 includes a conversion circuit 110, which includes an automatic gain control unit (auto-gain control unit) 112, a low-pass filter / equalizer (low-pass filtering / equalizing unit) 114, and a low-resolution modulus Converter (low resolution ADC) 116 . Implementations of the automatic gain control unit 112 , the low-pass filter / equalizer 114 , and the analog-to-digital converter 116 in this embodiment are widely known to those skilled in the field of optical disk drive systems, and thus need not be described in detail here.

[0019] see figure 2 , figure 2 It is a flowchart of an input sampling method according to a...

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Abstract

An input sampling circuit is used to process an optical disc reading signal. The input sampling circuit includes an automatic gain control unit for adjusting the gain of the optical disc reading signal; a low-pass filter / equalizer coupled to the automatic a gain control unit, used to perform low-pass filtering / equalization processing on the optical disc reading signal to generate an output signal; and an analog-to-digital converter, coupled to the low-pass filtering / equalizer, used for the output signal performing analog-to-digital conversion to generate a digital signal; wherein the analog-to-digital converter performs analog-to-digital conversion on the output signal in a conversion range smaller than the dynamic range of the output signal.

Description

technical field [0001] The invention provides an optical disc read signal processing circuit and method, in particular to an input sampling circuit and method for processing optical disc read signal. Background technique [0002] In recent years, optical storage technologies such as CD, DVD and other specifications have gradually become the mainstream technology for storage media applications due to their advantages of good portability and large storage capacity. Generally, when an optical disc drive system processes a disc read back signal read by a pickup, an analog-to-digital converter (ADC) is used to The data read from the optical disc is sampled to generate corresponding digital data values, and then subsequent digital signal processing is performed. [0003] However, when the rotational speed of the optical disk drive is applied to high-speed applications with the development of technology, the sampling frequency of the analog-to-digital converter is also increased, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/00
Inventor 颜光裕
Owner REALTEK SEMICON CORP