Samsung Electronics Co., Ltd.

Samung Electronics Co., Ltd

Jae-wook Lee

Jung-Hyun Lee

Eun-jin Ryu

Eing-seob Cho

Hyun-Soo Park

Jae-seong Shim

Hyung-Jin Choi

Jung-eun Lee

Jun-jin Kong

Jeong-won Lee

Sung-Han Choi

Seok-Jun Ko

Pan-Soo Kim

Konakov Maxim

Jae-song Shim

A method of determining characteristics of a signal and an apparatus using the method. The apparatus for determining characteristics of a signal includes: a level detector receiving sample values of a radio frequency (RF) signal and binary data obtained by binarizing the RF signal, generating selection signals based on the binary data, classifying each of the sample values of the RF signal into one of a plurality of levels using the selection signals, and outputting average values of sample values of each level; and a signal characteristics determiner determining a characteristics value that indicates the characteristics of the RF signal using the average values of the sample values belonging to each level.

Method for determining characteristics of signal and apparatus using the same

An apparatus and method for measuring the quality of a signal on an optical disc based on level information of a viterbi decoder are provided. The signal quality measuring apparatus includes: a binary unit that generates binary signals from input RF signals; a channel identifier that receives the input RF signals and the binary signals output from the binary unit and outputs reference level values corresponding to the binary signals; and an information calculator that receives the reference level values and detects a signal quality value.

Apparatus and method for measuring signal quality

A high-speed mixed analog/digital PRML data detection and clock recovery apparatus and method. The high-speed mixed analog/digital PRML data detection and clock recovery apparatus includes a variable gain amplifier, an analog equalizer, an analog-to-digital (A/D) converter, a DC offset remover, a level error detector, a Viterbi decoder, and an adaptive digital controller. The adaptive digital controller separately stores the level error values by predetermined frequencies, calculates predetermined coefficient values by each frequency component based on the level error values, and D/A-converts and applies the calculated predetermined coefficient values to the variable gain amplifier and the analog equalizer.

High-speed mixed analog/digital PRML data detection and clock recovery apparatus and method for data storage

A recording and/or reproducing apparatus and method with signal quality determining device and a method thereof, with the signal quality determining device including a signal estimator determining a level corresponding to a sample value of the RF signal using binary data obtained from the RF signal and generating a selection signal corresponding to the determined level, a channel identifier classifying the sample value into a plurality of levels according to the selection signal and obtaining an average value of the sample values classified into each level, and a quality calculator outputting a signal quality value representing quality of the RF signal using each sample value output from the channel identifier and the average value of the sample values classified into each level. Accordingly, quality of an RF signal can be determined more exactly, and focus compensation, tilt compensation, detrack compensation, and recording signal optimization can be performed using the determined signal quality.

Recording and/or reproducing apparatus and method with a signal quality determining device and method

A signal quality measuring method and apparatus in which a quality of a signal detected from an RF signal read out from a disk or a communications channel is measured by using eye pattern signals of the detected RF signals. Eye pattern signals representing time change of a waveform of the detected signal are generated and a signal quality value is generated based on an eye depth and/or an eye width measured from the eye pattern signals. A histogram of the eye pattern signals is used to identify a plurality of main level values which are used as a reference value in measuring the signal quality. Accordingly, signal characteristics in a high-density storage medium system or communication system may be accurately represented.

Method and apparatus for measuring signal quality using eye pattern

A defect signal detecting apparatus for an optical recording/reproducing apparatus that includes a maximum value detecting unit for detecting a highest amplitude among signals input during a maximum value detection period as a maximum value, a minimum value detecting unit for detecting a lowest amplitude among signals input during a minimum value detection period as a minimum value, an asymmetry detecting unit for calculating an amount &#x3b4; of asymmetry by detecting a maximum value Iand a minimum value Iof a signal Ihaving a maximum periodicity among the signal input, and a maximum value Iand a minimum value Iof a signal Ihaving a minimum periodicity among the signal input, and a defect determining unit for determining whether there is a defect in the signal input, using the maximum value, the minimum value and the amount &#x3b4; of asymmetry.

Defect signal detecting apparatus for optical recording/reproducing apparatus and defect signal detecting method thereof

An equalizer and an equalizing method of optical recording/reproducing apparatus capable of enhancing equalizing performance and equalizing speed are disclosed. The equalizer includes a FF unit having a feedforward filter for removing pre-cursor from inter-symbol interference of input signal, a FB unit having a feedback filter for predicting post-cursor of the inter-symbol interference and outputting it, a first adder and a second adder for adding the signal from the FF unit and the signal from the FB unit, to remove the inter-symbol interference, a slicer for deciding the level of the signal from the first adder to be a predetermined level and feeding back the level-decided signal to the FB unit, and a signal detection unit for outputting the signal having the inter-symbol interference removed by the second adder as a predetermined signal using at least one of a trellis structure method and a tree structure method.

Equalizer for optical recording/reproducing apparatus and equalizing method thereof

A frequency error detection apparatus and method based on histogram information of an input signal. The apparatus includes an A/D converter for and converting an analog signal into digital values; a zero crossing point detector for detecting sign changes of the digital values, and detecting zero crossing points; a period information detector for detecting period information which is the number of the digital values corresponding to a periodic signal; a histogram information calculator for counting the number of detections for the respective period information based on the period information, and calculating error-detection-target histogram information; and a frequency error calculator for detecting a difference between the error-detection-target histogram information and a reference histogram information, and calculating a frequency error value based on the difference. This can shorten time for frequency error detections and improve accuracy of the detected frequency error value.

Frequency error detection apparatus and method based on histogram information on input signals

A high speed Viterbi detector for an optical disk system, includes a frequency dividing unit for generating an auxiliary clock at one-third of the main clock frequency, a branch metric calculation unit for calculating each of a plurality of branch metrics, a serial-to-parallel converting unit for outputting each of the branch metrics at the main clock frequency in units of 3 state bits, an addition/comparison/selection unit for adding the branch metrics and previously stored state metrics and for comparing the addition results to select and output the minimum of the addition results as a new state metric, and for outputting a corresponding path selection signal, at the auxiliary clock frequency, a path memory for storing the path selection signal and for outputting parallel data corresponding to the path selection signal, at the auxiliary clock frequency, and a parallel-to-serial converting unit for converting the path memory output into serial data.

Viterbi detector for optical disk system

An apparatus for detecting a phase error for a system such as a CD or a DVD having a multi-level input signal with an irregular zero crossing shift, and a phase locked loop circuit using the same. An A/D converter digitizes a signal read from the CD or the DVD. A phase error detect unit detects a zero crossing of the digital signal consecutively input from the A/D converter, and detects a timing error from a signal corresponding to the detected zero crossing. An error correction unit corrects a sampling timing error of the A/D converter by shifting a phase corresponding to the timing error input from the phase error detect unit. An apparatus for detecting a timing error having a tracking function reduces the amount of normal jitter and a dispersion value of the timing error in accordance with a signal to noise ratio.

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Osan-si, South Korea

Jae-wook Lee