WO2005071680A1 - 信号処理装置、及び信号処理方法 - Google Patents
信号処理装置、及び信号処理方法 Download PDFInfo
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- WO2005071680A1 WO2005071680A1 PCT/JP2005/000086 JP2005000086W WO2005071680A1 WO 2005071680 A1 WO2005071680 A1 WO 2005071680A1 JP 2005000086 W JP2005000086 W JP 2005000086W WO 2005071680 A1 WO2005071680 A1 WO 2005071680A1
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- signal processing
- processing device
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- waveform
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- 238000003672 processing method Methods 0.000 title claims abstract description 17
- 238000000605 extraction Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000003044 adaptive effect Effects 0.000 claims description 25
- 238000005457 optimization Methods 0.000 claims description 18
- 238000007476 Maximum Likelihood Methods 0.000 claims description 14
- 230000003321 amplification Effects 0.000 claims description 14
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 14
- 230000004044 response Effects 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 4
- 230000017105 transposition Effects 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 10
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000015654 memory Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 241001260339 Uaru Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/497—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems by correlative coding, e.g. partial response coding or echo modulation coding transmitters and receivers for partial response systems
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
- G11B20/10055—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using partial response filtering when writing the signal to the medium or reading it therefrom
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/091—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector using a sampling device
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
- H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
Definitions
- the present invention relates to a signal processing device and a signal processing method, and more particularly to a signal processing device and a signal processing method for extracting information read out with high accuracy from a recording medium such as an optical disk, a magnetic disk, and a semiconductor memory.
- a signal read from a recording medium is first subjected to removal and amplification of a signal in a specific band by an analog filter. This is because it is necessary to amplify a signal in a specific band because noise cannot be removed and the amplitude cannot be accurately obtained when reading a high-frequency signal.
- FIG. 5 is a block diagram showing a conventional signal processing device.
- a conventional signal processing device includes a recording medium 101, a variable gain amplifier (VGA: Variable Gain Amplifier) 102, a low-pass filter (LPF: Low Pass Filter) 103 which is an analog filter, and an AZD.
- VGA Variable Gain Amplifier
- LPF Low Pass Filter
- a Viterbi decoder 109 that performs error correction using the Viterbi algorithm, an LMS (Least Mean Square) 110 that performs least mean square processing, and a timing that is a clock generation circuit for extracting a reproduction clock corresponding to a channel clock It consists of a recovery logic (TRL: Timing Recovery Logic) 111, ⁇ / ⁇ variable ⁇ 112, and a voltage controlled oscillator (VCO: Voltage Controlled Oscillator) 113. The operation will be described below.
- TRL Timing Recovery Logic
- VCO Voltage Controlled Oscillator
- the signal read from the recording medium 101 is adjusted by a variable gain unit 102 and an automatic gain controller 105 so that its amplitude becomes a desired magnitude, and a low-noise filter 103 removes high-frequency noise. Is done.
- the signal from which high-frequency noise has been removed by the low-pass filter 103 is converted into a digital signal by the AZD converter 104, and a specific band is amplified by the waveform equalizer 106.
- the sampling timing in the A / D converter 104 is defined by the recovered clock extracted by the timing recovery logic 111, the DZA converter 112, and the voltage controlled oscillator 113.
- Adaptive transversal filter 108 equalizes the signal amplified by waveform equalizer 106 to a PR (Partial Response) waveform.
- the LMS 110 performs a least mean square calculation, calculates an equalization error, and adjusts the tap coefficient of the adaptive transversal filter 108 so that the error is reduced.
- This PR waveform-equalized signal is decoded by the Viterbi decoder 109 (for example, see Patent Document 1).
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-85764
- the optimization in the time axis direction and the optimization in the amplitude direction are simultaneously performed by one waveform equalizer, and the jitter value is improved satisfactorily. If the processing to increase the amplification level is performed in order to reduce noise, PR waveform equalization may be adversely affected by noise amplification, etc., and even if the jitter value reaches the optimum value, the error rate can be reduced in proportion to it. I wouldn't do it!
- the present invention has been made to solve the above-described conventional problems, and a signal processing apparatus and a signal processing method capable of simultaneously reducing a jitter component and an error rate. It is intended to provide a processing method.
- a signal processing device is a signal processing device for processing a signal according to a PRML method, comprising: an AZD converter that converts an analog signal into a digital signal; A first waveform equalizer that amplifies the specific band of the signal and optimizes the data of the clock extraction system, and is connected to the AZD converter to amplify the specific band of the signal A second waveform equalizer that performs waveform equalization and optimizes data of a data processing system, and a timing scan logic circuit that is connected to the first waveform equalizer and extracts a reproduced clock. And a decoder connected to the second waveform equalizer for decoding data.
- the signal processing device includes a variable gain device that automatically adjusts the amplitude of a signal read from a recording medium to a desired magnitude, and the variable gain device.
- a AZD converter connected to the AZD converter for removing a signal in a specific band, an AZD converter connected to the filter circuit for converting an analog signal to a digital signal, and a waveform of a reproduced signal connected to the AZD converter.
- Adaptive transversal filter that amplifies signals in a specific band while performing equalization, an automatic gain controller connected to the AZD converter, and waveform equalization connected to the AZD converter to perform waveform equalization
- a control circuit connected to the waveform equalizer and performing a baseline control; a detection circuit connected to the adaptive transversal filter and performing error detection and correction using an LMS algorithm; A decoder connected to the adaptive transversal filter and performing maximum likelihood decoding; and a timing logic circuit connected to the control circuit and extracting a recovered clock.
- the signal processing device includes a variable gain device that automatically adjusts the amplitude of a signal read from a recording medium to a desired magnitude, and the variable gain device.
- An AZD converter connected to the AZD converter for converting an analog signal into a digital signal; an adaptive transversal filter connected to the AZD converter for equalizing a waveform of a reproduced signal and amplifying a signal of a specific band;
- An automatic gain controller connected to the AZD converter; a waveform equalizer connected to the AZD converter for waveform equalization; and a control connected to the waveform equalizer and performing baseline control.
- a detection circuit connected to the adaptive transversal filter and performing error detection and correction using an LMS algorithm; and a decoder connected to the adaptive transversal filter and performing maximum likelihood decoding And a timing scan logic circuit connected to the control circuit and extracting a reproduced clock.
- a signal processing device is a signal processing device according to claim 2.
- the filter is a low-pass filter having a third or lower order.
- the waveform equalizer is configured in the signal processing device according to any one of claims 1 to 3.
- the filter is characterized in that the tap coefficient value of the filter is variable and the amplification degree can be freely set.
- the signal processing device is the signal processing device according to claim 1, wherein the signal processing device includes the first waveform equalizer and the second waveform equalizer.
- the equalizer is constituted by an adaptive transversal filter that performs a filter process on an input signal according to an equalization coefficient.
- the signal processing device is the signal processing device according to any one of claims 1 to 3, wherein in the signal processing device, the vertical resolution of the AZD converter is: It is characterized by being 7 bits or less.
- the decoder in the signal processing device according to any one of claims 1 to 3, in the signal processing device, includes a Viterbi algorithm. This is the decoding circuit used.
- a signal processing device is the signal processing device according to any one of claims 1 to 3, wherein the signal processing device calculates a jitter value, and An adjustment circuit for automatically adjusting the degree of amplification of the waveform equalizer based on the obtained jitter value.
- a signal processing device is the signal processing device according to any one of claims 2 and 3, wherein the recording medium is an optical disk medium. It is.
- a signal processing device is characterized in that, in the signal processing device according to any one of claims 2 and 3, the recording medium is a magnetic disk medium. Things.
- a signal processing device is characterized in that, in the signal processing device according to any one of claims 2 and 3, the recording medium is a semiconductor memory. Is what you do.
- the channel clock extraction process in the clock extraction system and the reproduction signal extraction process in the data reproduction system are performed separately, the processes are performed without mutual interference between the jitter component and the error rate. As a result, it is possible to simultaneously reduce the jitter component and the error rate.
- data at a stage before being amplified by the digital equalizer is treated as input data of a waveform equalization path, and a clock system path and a reproduction data equalization system path are separately subjected to parallel filtering processing. Therefore, noise amplification caused by passing through the digital equalizer can be avoided. In addition, it is performed by the conventional digital equalizer! / In addition, since amplification of a specific band is performed using FIR (Finite Impulse Response) and LMS (Least Mean Square), it is possible to optimize both the time axis direction and the amplitude direction.
- FIR Finite Impulse Response
- LMS Least Mean Square
- FIG. 1 is a block diagram showing a signal processing device according to Embodiment 1 of the present invention.
- FIG. 2 is a block diagram showing a signal processing device according to Embodiment 2 of the present invention.
- FIG. 3 is a block diagram showing a signal processing device according to Embodiment 3 of the present invention.
- FIG. 4 is a block diagram showing a signal processing device according to Embodiment 4 of the present invention.
- FIG. 5 is a block diagram showing a conventional signal processing device.
- FIG. 1 is a block diagram showing a signal processing device according to Embodiment 1 of the present invention.
- the signal processing device includes an AZD converter 4, a first waveform equalizer 14, a second waveform equalizer 15, and a maximum likelihood decoding.
- Maximum Likelihood (ML) 16, timing recovery logic (TRL) 11 which is a clock generation circuit for extracting a recovered clock corresponding to the channel clock, and DZA converter 12 And a voltage controlled oscillator (VCO: Voltage Controlled Oscillator) 13.
- VCO Voltage Controlled Oscillator
- the signal processing device converts digital information into a PRML (Partial Response Maximum Likelihood) system.
- PRML Partial Response Maximum Likelihood
- the signal converted into a digital signal by the AZD converter 4 is referred to by a first waveform equalizer 14 with reference to a desired boost value in a clock extraction system for optimizing data in the time axis direction.
- the signal is amplified. This amplified data is reproduced in accordance with the channel clock. It is input to a timing logic circuit 11 which is a clock generation circuit for extracting a clock.
- the timing recovery logic 11 that performs clock extraction includes a PLL (Phase Locked Loop) circuit, and uses the voltage-controlled oscillator 13 to generate a reproduction clock (channel clock) synchronized with the reproduction signal.
- PLL Phase Locked Loop
- Maximum likelihood decoder 16 performs maximum likelihood decoding.
- the clock extraction system for optimizing data in the time axis direction and the data processing system for optimizing data in the amplitude direction use different waveform equalizers. Since signal amplification in a specific band or, further, waveform equalization is performed, it is possible to simultaneously reduce the jitter component and the error rate.
- FIG. 2 is a block diagram showing a signal processing device according to Embodiment 2 of the present invention.
- the signal processing device includes a recording medium 1 such as an optical disk medium, a magnetic disk medium, and a semiconductor memory, a variable gain device (VGA Variable Gain Amplifier) 2, A low-pass filter (LPF: Low Pass Filter) 3, an AZD variable ⁇ 4, an automatic gain controller (AGC: Auto Gain Control) 5, and a desired boost value
- VGA Variable Gain Amplifier
- LPF Low Pass Filter
- AGC Automatic Gain Control
- a waveform equalizer DEQ: Digital Equalizer
- DEQ Digital Equalizer
- baseline adjuster 7 an adaptive transversal filter
- FIR Finite Impulse Response
- LMS that performs least squares processing (Least Mean Square) 10
- Viterbi decoder 9 that performs error correction using the Viterbi algorithm
- a timing recovery logic a clock generation circuit for extracting a reproduced clock corresponding to the channel clock.
- TRL Timing Recovery Logic
- D / A change ⁇ and voltage control And an oscillator
- VCO Voltage
- the signal processing device reproduces digital information recorded on a recording medium by the PRML method.
- the signal read from the recording medium 1 is automatically adjusted by the variable gain unit 2 and the automatic gain controller 5 so that the amplitude thereof becomes a desired value.
- the high-frequency noise is removed by 3 and the waveform is shaped.
- the signal whose high-frequency noise has been removed and whose waveform has been shaped is converted into digital data at a desired vertical resolution (for example, 7 bits or less) by AZD transposition 4.
- the converted digital data is amplified by the waveform equalizer 6 with reference to a desired boost value. Further, the baseline adjuster 7 detects how much the center is deviated from the input signal, and corrects the DEQ output and the AZD variable output by the deviated values.
- the amplified and corrected data is input to a timing logic circuit 11, which is a clock generation circuit for extracting a reproduced clock corresponding to the channel clock. Timing for Clock Extraction
- the scanning logic 11 includes a PLL circuit, calculates a frequency error and a phase error, adjusts the frequency and phase, and generates a control signal to the voltage controlled oscillator 13.
- the voltage control oscillator 13 outputs a reproduction clock (channel clock) synchronized with the reproduction signal based on the control signal.
- a reproduction clock channel clock
- signal amplification in a specific band is performed on the AZD conversion output value by the adaptive transversal filter 8 and the LMS 10.
- the Viterbi decoder 9 performs error correction on the waveform-equalized signal.
- data optimization in the time axis direction is performed using the digital equalizer output data
- data optimization in the amplitude direction is performed using the AZD conversion output data. Since signal amplification in a specific band is performed using a filter and LMS, both the time axis direction and the amplitude direction can be optimized, thereby reducing the jitter component and the error rate. Can be done simultaneously. (Embodiment 3)
- FIG. 3 is a block diagram showing a signal processing device according to Embodiment 3 of the present invention.
- the signal processing device includes a recording medium 1 such as an optical disk medium, a magnetic disk medium, and a semiconductor memory, a variable gain device (VGA Variable Gain Amplifier) 2, An AZD converter 4, an automatic gain controller (AGC) 5, a waveform equalizer (DEQ: Digital Equalizer) 6 for amplifying a signal by referring to a desired boost value, and a baseline adjuster 7.
- a recording medium 1 such as an optical disk medium, a magnetic disk medium, and a semiconductor memory
- VGA Variable Gain Amplifier 2 variable gain device
- An AZD converter 4 an automatic gain controller
- DEQ Digital Equalizer
- the signal processing device reproduces digital information recorded on a recording medium by the PRML method.
- the signal read from the recording medium 1 is automatically adjusted by the variable gain unit 2 and the automatic gain controller 5 so that the amplitude becomes a desired magnitude. It is converted into digital data with a vertical resolution of less than one bit.
- the converted digital data is amplified by the waveform equalizer 6 with reference to a desired boost value. Further, the baseline adjuster 7 detects how much the center is deviated from the input signal, and corrects the DEQ output and the AZD variable output by the deviated value.
- the amplified and corrected data is input to a timing logic circuit 11, which is a clock generation circuit for extracting a reproduction clock corresponding to the channel clock.
- the timing logic logic 11 that performs clock extraction includes a PLL circuit, calculates a frequency error and a phase error, adjusts the frequency and phase, and generates a control signal to the voltage-controlled oscillator 13.
- the voltage control oscillator 13 generates a reproduction clock (synchronized with the reproduction signal) based on the control signal. Channel clock).
- the AZD conversion output value is amplified in a specific band by the adaptive transversal filter 8 and the LMS 10.
- the waveform-equalized signal is subjected to error correction by a Viterbi decoder 9.
- data optimization in the time axis direction is performed using digital equalizer output data
- data optimization in the amplitude direction is performed using FIR using AZD conversion output data. Since signal amplification in a specific band is performed using a filter and LMS, both the time axis direction and the amplitude direction can be optimized, thereby reducing the jitter component and the error rate. Can be done simultaneously.
- FIG. 4 is a block diagram showing a signal processing device according to Embodiment 4 of the present invention.
- the signal processing device includes a recording medium 1 such as an optical disk medium, a magnetic disk medium, and a semiconductor memory, a variable gain device (VGA Variable Gain Amplifier) 2, Lowpass filter (LPF: Low Pass Filter) 3, an AZD variable ⁇ 4, automatic gain controller (AGC: Auto Gain Control) 5, and desired boost value Waveform equalizer (DEQ: Digital Equalizer) 6, Baseline adjuster 7, Adaptive transversal filter (FIR: Finite Impulse Response) 8, and LMS for least squares processing (Least Mean Square) 10, a Viterbi decoder 9 that performs error correction using the Viterbi algorithm, and a timing recovery logic that is a clock generation circuit for extracting a recovered clock corresponding to the channel clock TRL: Timing Recovery Logic) 11, DZA transformation ⁇ 12, Voltage Controlled Oscillator (VCO) 13, and tap coefficient values stored in a table provided in a memory (not shown).
- the signal processing device reproduces digital information recorded on a recording medium by a PRML method.
- the signal read from the recording medium 1 is automatically adjusted by the variable gain unit 2 and the automatic gain controller 5 so that the amplitude thereof becomes a desired amplitude, and is a Lonos filter which is an analog filter.
- the high-frequency noise is removed and the waveform is shaped.
- the signal whose high-frequency noise has been removed and whose waveform has been shaped is converted into digital data with a desired vertical resolution (for example, 7 bits or less) by AZD transposition 4.
- the converted digital data is amplified by the waveform equalizer 6 with reference to a desired boost value. Further, the baseline adjuster 7 detects how much the center is deviated from the input signal, and corrects the DEQ output and the AZD variable output by the deviated value.
- the amplified and corrected data is input to a timing scanning logic 11 which is a clock generation circuit for extracting a reproduction clock corresponding to the channel clock.
- the adjuster 17 calculates a jitter value based on the DEQ output corrected by the baseline adjuster 7, and automatically updates the tap coefficient of the waveform equalizer 6 so that the jitter value is minimized. .
- a table is prepared in a memory or the like, and the table is referred to. Further, the output value of the waveform equalizer 6 is also inputted to a timing logic circuit 11 which is a clock generation circuit for extracting a reproduced clock corresponding to the channel clock based on the amplified and corrected data.
- the timing logic 11 for extracting a clock includes a PLL circuit, calculates a frequency error and a phase error, adjusts the frequency and phase, and generates a control signal to the voltage controlled oscillator 13.
- the voltage controlled oscillator 13 outputs a reproduction clock (channel clock) synchronized with the reproduction signal based on the control signal.
- the adaptive transversal filter 8 and the LMS 10 use the adaptive transversal filter 8 and the LMS 10 to output the AZD variable ⁇ .
- the signal whose waveform has been equalized is subjected to error correction by a Viterbi decoder 9.
- data optimization in the time axis direction is performed using digital equalizer output data
- data optimization in the amplitude direction is performed using A / D conversion output data.
- the FIR filter and LMS are used to amplify the signal in a specific band, so that it is possible to optimize both the time axis direction and the amplitude direction, thereby reducing the jitter component and the error rate. Can be performed simultaneously.
- the adjuster 17 calculates a jitter value based on the DEQ output corrected by the baseline adjuster 7, and automatically adjusts the tap coefficient of the waveform equalizer 6 so that the jitter value is minimized. Since it is decided that the frequency is updated, it is possible to extract the channel clock accurately by reducing the jitter component.
- the signal processing device and the signal processing method according to the present invention can reduce the jitter component and the error rate at the same time, and are therefore useful, for example, as a DVD playback device. It can also be applied to applications such as magnetic recording devices and semiconductor memories.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/587,080 US20080253011A1 (en) | 2004-01-23 | 2005-01-06 | Signal Processing Device and Signal Processing Method |
JP2005517216A JP4203071B2 (ja) | 2004-01-23 | 2005-01-06 | 信号処理装置 |
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JP2004015926 | 2004-01-23 | ||
JP2004-015926 | 2004-01-23 |
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US (1) | US20080253011A1 (ja) |
JP (1) | JP4203071B2 (ja) |
CN (1) | CN1910690A (ja) |
WO (1) | WO2005071680A1 (ja) |
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JP2007087537A (ja) * | 2005-09-22 | 2007-04-05 | Rohm Co Ltd | 信号処理装置、信号処理方法、および記憶システム |
JP2007087535A (ja) * | 2005-09-22 | 2007-04-05 | Rohm Co Ltd | 信号処理装置、信号処理方法、および記憶システム |
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US7948703B1 (en) * | 2008-01-30 | 2011-05-24 | Marvell International Ltd. | Adaptive target optimization methods and systems for noise whitening based viterbi detectors |
US8831133B2 (en) * | 2011-10-27 | 2014-09-09 | Lsi Corporation | Recursive digital pre-distortion (DPD) |
US8837066B1 (en) * | 2014-04-17 | 2014-09-16 | Lsi Corporation | Adaptive baseline correction involving estimation of filter parameter using a least mean squares algorithm |
US20150341158A1 (en) * | 2014-05-23 | 2015-11-26 | Mediatek Inc. | Loop gain calibration apparatus for controlling loop gain of timing recovery loop and related loop gain calibration method |
FR3030964B1 (fr) * | 2014-12-19 | 2017-01-13 | Amesys | Indentification conjointe de signaux confondus en telecommunications numeriques non cooperatives |
JP2017067516A (ja) * | 2015-09-29 | 2017-04-06 | 株式会社ミツトヨ | 計測機器用の信号処理装置 |
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JP2001297534A (ja) * | 2000-02-14 | 2001-10-26 | Stmicroelectronics Inc | 増幅した信号のサンプルの和に基づいて増幅器の利得を制御する回路及び方法 |
JP2002343023A (ja) * | 2001-05-17 | 2002-11-29 | Matsushita Electric Ind Co Ltd | 光ディスク装置 |
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US6310909B1 (en) * | 1998-12-23 | 2001-10-30 | Broadcom Corporation | DSL rate adaptation |
JP2001110059A (ja) * | 1999-10-05 | 2001-04-20 | Yamaha Corp | 光ディスク再生方法および光ディスク再生装置 |
JP2001357633A (ja) * | 2000-06-12 | 2001-12-26 | Mitsubishi Electric Corp | 情報再生装置および情報再生方法 |
US20050030660A1 (en) * | 2003-08-08 | 2005-02-10 | Ho-Yul Bang | Amplitude spike detector for head instability |
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2005
- 2005-01-06 US US10/587,080 patent/US20080253011A1/en not_active Abandoned
- 2005-01-06 JP JP2005517216A patent/JP4203071B2/ja not_active Expired - Fee Related
- 2005-01-06 CN CNA2005800028792A patent/CN1910690A/zh active Pending
- 2005-01-06 WO PCT/JP2005/000086 patent/WO2005071680A1/ja active Application Filing
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JP2000243034A (ja) * | 1999-02-22 | 2000-09-08 | Fujitsu Ltd | 等化・位相制御システム,およびそれを備えるディスク記憶装置 |
JP2001195830A (ja) * | 2000-01-17 | 2001-07-19 | Matsushita Electric Ind Co Ltd | デジタル記録データ再生装置 |
JP2001297534A (ja) * | 2000-02-14 | 2001-10-26 | Stmicroelectronics Inc | 増幅した信号のサンプルの和に基づいて増幅器の利得を制御する回路及び方法 |
JP2002343023A (ja) * | 2001-05-17 | 2002-11-29 | Matsushita Electric Ind Co Ltd | 光ディスク装置 |
Cited By (3)
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JP2007087537A (ja) * | 2005-09-22 | 2007-04-05 | Rohm Co Ltd | 信号処理装置、信号処理方法、および記憶システム |
JP2007087535A (ja) * | 2005-09-22 | 2007-04-05 | Rohm Co Ltd | 信号処理装置、信号処理方法、および記憶システム |
JP4652939B2 (ja) * | 2005-09-22 | 2011-03-16 | ローム株式会社 | 信号処理装置および記憶システム |
Also Published As
Publication number | Publication date |
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JP4203071B2 (ja) | 2008-12-24 |
JPWO2005071680A1 (ja) | 2007-12-27 |
CN1910690A (zh) | 2007-02-07 |
US20080253011A1 (en) | 2008-10-16 |
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