WO2005083883A1 - 波形等化器及びこれを有する情報再生装置 - Google Patents
波形等化器及びこれを有する情報再生装置 Download PDFInfo
- Publication number
- WO2005083883A1 WO2005083883A1 PCT/JP2005/003180 JP2005003180W WO2005083883A1 WO 2005083883 A1 WO2005083883 A1 WO 2005083883A1 JP 2005003180 W JP2005003180 W JP 2005003180W WO 2005083883 A1 WO2005083883 A1 WO 2005083883A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conductance
- amplifier
- conductance amplifier
- waveform equalizer
- group delay
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
- H03H11/0422—Frequency selective two-port networks using transconductance amplifiers, e.g. gmC filters
- H03H11/0433—Two integrator loop filters
Definitions
- Waveform equalizer and information reproducing apparatus having the same
- the present invention relates to a waveform equalizer that performs an equalization process on an input signal, and an information reproducing apparatus that has the waveform equalizer and reproduces information stored on an optical disk or the like.
- an information reproducing apparatus using a magnetic disk such as a hard disk or an optical disk such as a compact disk (CD) as a recording medium has been used for an external storage device of a computer, an audio device or the like.
- the attenuation of the reproduced signal in the high band is caused by the optical pickup unit that detects information stored on the optical disk as an optical signal, the response characteristics of a circuit that converts the optical signal into an electric signal, and the like.
- the amount of boost in the high frequency band (gain in the high frequency band based on the gain in the low frequency band) in this equalization processing is determined by using a control circuit or the like provided in the information reproducing apparatus.
- the boost amount is adjusted so that the amplitude of the reproduced signal attenuated in the high frequency range becomes the same as the amplitude in the low frequency range, so that the information recorded on the recording medium such as an optical disk can be adjusted. Improves reading accuracy (reduces reading errors).
- an equiripple filter (equiripple filter) or the like is generally used.
- Figures 6 and 7 show the characteristics of the equiripple filter. As shown by the line 100 in FIG. 6, the gain in the high band is larger than that in the low band. Also, as shown by the line 101 in FIG. 7, the group delay has no frequency dependency! , (The phase vs. frequency characteristic is linear), the change in group delay difference between each band between the input and output waveforms of the equiripple filter Does not occur.
- the group delay difference is caused by a combination of factors inside the integrated circuit (IC) including the circuit for performing the above equalization processing and factors outside the IC such as the response characteristics of the optical pickup unit mechanism.
- IC integrated circuit
- the circuit for performing the above equalization processing and factors outside the IC such as the response characteristics of the optical pickup unit mechanism.
- it is difficult to correct the group delay difference to make the group delay difference zero or to reduce it
- the waveform distortion of the reproduced signal due to the group delay difference causes optical disc distortion.
- Etc. the reading accuracy of information recorded on the recording medium is degraded (read errors are increased).
- the present invention can perform gain adjustment and group delay adjustment of an attenuated frequency band separately and independently, and can perform waveform equalization that can easily perform signal equalization processing. It is intended to provide a device and an information reproducing device.
- the waveform equalizer is capable of setting a boost amount for performing gain adjustment for a predetermined frequency band of an input signal to the waveform equalizer, An arithmetic circuit for adjusting the gain of the input signal by changing the boost amount, and a first conductance amplifier and a second conductance amplifier connected to a preceding stage or a subsequent stage of the arithmetic circuit, An all-pass filter that adjusts and corrects the group delay characteristic of the input signal by changing the conductance of at least one of the first conductance amplifier and the second conductance amplifier.
- the gain adjustment of the input signal attenuated in the high frequency range and the adjustment for correcting the group delay characteristic can be performed separately and independently.
- adjustment since adjustment can be performed individually, waveform equalization The adjustment for performing the equalization processing of the input signal to the device is facilitated.
- the all-pass filter is connected between an input / output circuit of the first conductance amplifier, includes a differentiator including a first capacitor, and the first conductance It is preferable to further include a second capacitor connected between the input side of the amplifier and the output side of the second conductance amplifier! /.
- an input voltage to the all-pass filter is supplied to one input terminal of the first conductance amplifier, and one input terminal of the second conductance amplifier is provided. Is supplied with a voltage applied to the output terminal of the first conductance amplifier, and the other input terminal of the first conductance amplifier and the other input terminal of the second conductance amplifier receive the output voltage of the all-pass filter. Are applied to the output terminal of the second conductance amplifier, respectively, and the input voltage to the all-pass filter and the voltage applied to the output terminal of the first conductance amplifier have inverted phases. ing.
- the all-pass filter fixes the conductance of the first conductance amplifier, makes the conductance of the second conductance amplifier variable, and changes the conductance of the second conductance amplifier.
- the group delay characteristic of the input signal may be adjusted and corrected while fixing the group delay of the input signal in the DC region.
- the all-pass filter varies the conductance of the first conductance amplifier and changes the conductance of the first conductance amplifier, thereby correcting a group delay characteristic of the input signal. May be changed!
- the first conductance Changing the conductance of the amplifier facilitates adjustment of the group delay.
- the arithmetic circuit may have an equal ripple filter power.
- an information reproducing apparatus comprises: a detecting unit that detects information recorded on a recording medium and converts the information into an electric signal;
- An information reproducing apparatus comprising: a waveform equalizer that receives the waveform equalizer; and a processing circuit that processes an output of the waveform equalizer power, using any one of the waveform equalizers described above as the waveform equalizer,
- a control unit is provided for setting the boost amount and setting a variable conductance among the conductance of the first conductance amplifier and the conductance of the second conductance amplifier.
- the gain adjustment and the group delay adjustment of the attenuated frequency band can be performed independently and independently, and the signal equalization is performed. Processing can be performed easily.
- FIG. 1 is a block diagram of a CD playback device according to an embodiment of the present invention.
- FIG. 2 is a circuit configuration diagram of an all-pass filter in FIG. 1.
- FIG. 3 is a diagram showing a group delay characteristic of the all-pass filter in FIG. 1.
- FIG. 4 is a diagram showing group delay characteristics of the all-pass filter in FIG. 1.
- FIG. 5 is a circuit configuration diagram of a modification of the all-pass filter in FIG. 1.
- FIG. 6 is a diagram illustrating characteristics of an equiripple filter conventionally used in a waveform equalizer.
- FIG. 7 is a diagram showing characteristics of an equiripple filter conventionally used in a waveform equalizer. Explanation of symbols
- FIG. 1 shows the configuration of a CD playback device as an example of an information playback device.
- FIG. 1 Outline of CD playback device
- reference numeral 2 denotes a compact disk (CD) as a recording medium.
- a CD reproducing apparatus 1 includes a spindle motor 3 for rotating a CD 2 and a laser beam for reading information recorded on the CD 2.
- Optical boost 4 a detector 5 that converts an optical signal detected by the optical pickup 4 into an electric signal and outputs it as an RF (Radio Frequency) signal, an RF amplifier 6 that amplifies the RF signal, and a boost amount
- the equal ripple filter (equal ripple filter) 7a and the equal ripple filter 7a which can be set freely and boost the high frequency band of the amplified RF signal output from the RF amplifier 6 to adjust the gain.
- the spindle motor 3 and the optical pickup 4 schematically includes a driver 10 for controlling the servo mechanism, a CPU (Central Processing Unit: central processing unit) 11 for controlling the equi-removable filter 7a, the all-pass filter 7b, and the driver 10.
- the CPU 11 can be replaced with any one having a function similar to that of the CPU 11 as an example having the function of controlling the equiripple filter 7a, the all-pass filter 7b, and the driver 10 (for example, MPU ( Micro Processing Unit).
- a signal for determining the boost amount of the equiripple filter 7a is provided from the CPU 11, and a signal for determining characteristics of the all-pass filter 7b described later is also provided from the CPU 11.
- the equal ripple filter 7a and the all-pass filter 7b equalize the waveform of the amplified RF signal output from the RF amplifier 6, and constitute a waveform equalizer 7 that outputs an equalized signal.
- the characteristics of the equiripple filter 7a are the same as those in FIGS. 6 and 7, and the description is omitted.
- FIG. 2 Configuration and operation of all-pass filter
- the all-pass filter 7b has two variable conductance amplifiers (hereinafter simply referred to as “gm amplifiers”) 22 and 23.
- the conductances gml and gm2 can be freely controlled by current control or voltage control from the CPU 11, respectively. Can be set.
- the output voltage of the equiripple filter 7a is supplied to the positive (non-inverting) input terminal (+) of the gm amplifier 22, the input terminal of the inverter 24, and one end of the capacitor 26 via the terminal 20.
- the other end of 26 is connected to the output terminal and negative (inverted) input terminal (1) of the gm amplifier 23 and the negative input terminal (1) of the gm amplifier 22 respectively.
- the output terminal of the inverter 24 is connected to the output terminal of the gm amplifier 22 and the positive input terminal (+) of the gm amplifier 23 via the capacitor 25.
- the voltage applied to the output terminal of the gm amplifier 23 is supplied to the AZD converter 8 (see FIG. 1) via the terminal 21.
- the inverter 24 and the capacitor 25 constitute a differentiator.
- the all-pass filter 7b thus configured forms a second-order all-pass filter.
- the transfer function T (s) of the second-order all-pass filter is represented by the following equation (1).
- Q is a quality factor
- s is a Laplace operator
- ⁇ is a natural angular frequency
- ⁇ is an angular frequency.
- the gain of a second-order all-pass filter such as the all-pass filter 7b is 1 independent of frequency.
- the phase ⁇ ⁇ ⁇ ⁇ in the function T (s) is expressed by the following equation (2).
- Equation (5) Comparing Equation (5) with Equation (1) for the transfer function of a general second-order all-pass filter
- the group delay GD in the DC region of the all-pass filter 7b becomes 2Cl / gml, and does not depend on the conductance gm2 of the gm amplifier 23.
- the conductance gml of the gm amplifier 22 and changing the conductance gm2 of the gm amplifier 23, the signal input to the all-pass filter 7b is changed. It is possible to fix the group delay in the DC range and easily adjust the group delay only in the high range.
- the signal input to the waveform equalizer 7 is fixed by fixing the conductance gml of the gm amplifier 22 and changing the conductance gm2 of the gm amplifier 23. It can be said that it is possible to adjust the group delay only in the high frequency range while fixing the group delay in the direct current range.
- the gm amplifier 22 may not be a variable conductance amplifier but may be a conductance amplifier having a fixed conductance. In this case, the circuit scale of the gm amplifier 22 can be reduced, and the CPU 11 does not need to control the gm amplifier 22, so that wiring for performing the control can be omitted and the processing of the CPU 11 can be simplified.
- FIGS. 3 and 4 are graphs in which the horizontal axis represents frequency and the vertical axis represents group delay, and the group delay characteristic of the all-pass filter 7b is calculated based on the above equation (5).
- Curve 40, 41, and 42 in FIG. 3, respectively (8 1111, 8 1112) (1.0, 1.5), (1.0, 1.0), (1.2, 0,0. 5) Group delay characteristics when [mAZV] ([milliamp Z volts]) are shown. That is, the curves 40, 41, and 42 show changes in the group delay characteristics when gm2 is changed after fixing gml!
- the group delay becomes maximum (about 3. Onsec) at the frequency: about 150 MHz
- the curve 41 becomes the maximum group delay (about 4.3 nsec) at the frequency: about 130 MHz
- the curve 42 shows the group delay.
- the group delays in the DC region of curves 40-42 are all 2. Onsec (all curves 40-42 Below 10 MHz, the group delay is almost 2 nsec! /
- gml, gm2 (1.0, 1.0) to correct the group delay difference of the signal. (Eliminate the difference between the group delay in the DC region and the group delay at a frequency of 130 MHz).
- the group delay is maximum (about 2.8 nsec) at a frequency of about 200 MHz, and the group delay in the DC region is about 1.3 nsec.
- the group delay is maximum (about 4.3 nsec) at a frequency of about 130 MHz, and the group delay in the DC region is 2.
- the group delay is maximum (about 8.6 nsec) at the frequency: about 70 MHz, and the group delay in the DC region is 4. Onsec.
- the frequency at which the group delay is maximized is approximately 100MHz to approximately 150MHz, whereas curves 50, 51, and 52 are different. In each case, the frequency at which the group delay is maximized differs greatly. Therefore, if the frequency for correcting the group delay is fluid, such as 70 MHz to 200 MHz, the adjustment can be easily performed by adjusting only gml or both gml and gm2.
- the waveform equalizer 7 includes the equi-ripple filter 7a that boosts the high frequency band, and the all-pass filter 7b that compensates (corrects) the group delay difference of the signal output from the equi-ripple filter 7a. Since the adjustment of the boost amount and the adjustment of the group delay can be performed separately and independently, both adjustments can be easily performed.
- an all-pass filter 67b which is a modification of the specific circuit configuration of the all-pass filter 7b, will be described with reference to FIG.
- the all-pass filter 67b may be used in place of the all-pass filter 7b of the CD playback device 1 in FIG. 1.
- a description will be given assuming that the all-pass filter 7b in FIG. 1 is replaced with the all-pass filter 67b.
- the all-pass filter 67b is a variable conductance amplifier of two differential inputs and differential outputs. Have conductances gml and gm2 (not shown in FIG. 5). The conductances gml and gm2 can be freely set by current control or voltage control from the CPU 11, respectively.
- the output voltage Vin of the equiripple filter 7a is given to the terminal 60 with reference to the terminal 61, and the voltage Vin is given to the differential input terminal of the gm amplifier 71 (the negative input terminal of the differential input terminal).
- Input terminal (1) is given to the positive input terminal (+) of the differential input terminal).
- the terminal 60 is connected to the negative output terminal ( ⁇ ) of the differential output terminal of the gm amplifier 70 and the negative input terminal (1) of the differential input terminal of the gm amplifier 71 via the capacitor 73, respectively.
- the positive output terminal (+) and the terminal 62 of the differential output terminal of the gm amplifier 71 are connected via the capacitor 74, respectively.
- the terminal 61 is connected to a positive output terminal (+) of a differential output terminal of the gm amplifier 70 and a positive input terminal (+) of a differential input terminal of the gm amplifier 71 via a capacitor 72, respectively. Connected to the negative output terminal (-) of the differential output terminal of the gm amplifier 71 and the terminal 63 via the capacitor 75.
- the voltage applied to the differential output terminals of the gm amplifier 71 is fed back to the inputs of the gm amplifiers 70 and 71.
- the positive output terminal (+) of the differential output terminal of the gm amplifier 71 is the negative input terminal (1) of the negative feedback input terminal of the gm amplifier 70 and the negative input terminal of the negative feedback input terminal of the gm amplifier 71.
- the negative output terminal of the differential output terminal of the gm amplifier 71 is connected to the positive input terminal (+) of the negative feedback input terminal of the gm amplifier 70, and the negative input terminal of the gm amplifier 71. It is connected to each of the positive input terminals (+) of the feedback input terminals.
- the voltage Vout applied to the terminal 62 based on the voltage applied to the terminal 63 is supplied to the AZD converter 8 (see FIG. 1) as the output voltage of the all-pass filter 67b.
- the capacitance of both capacitors 72 and 73 is C1 and the capacitance of both capacitors 74 and 75 is C2.
- a CD is taken as an example of the recording medium, and the information reproducing apparatus is used as the information reproducing apparatus.
- the CD playback device has been described as an example, but in addition to a CD, the recording medium is CD-R (for ompact Disk Recordable), D-ROM (for ompact Disk Read Only Memory), and CD-RW (for Compact Disk).
- an all-pass filter 7b is connected to a stage subsequent to the equal ripple filter 7a, and an all-pass filter 7b is connected to a stage preceding the equal ripple filter 7a.
- a waveform equalizer may be configured.
- the gain adjustment and the group delay adjustment of the attenuated frequency band can be performed independently and independently, and the signal equalization process is easily performed. be able to.
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Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006510480A JPWO2005083883A1 (ja) | 2004-03-02 | 2005-02-25 | 波形等化器及びこれを有する情報再生装置 |
US10/588,638 US7535816B2 (en) | 2004-03-02 | 2005-02-25 | Waveform equalizer and information reproducing apparatus therewith |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004057019 | 2004-03-02 | ||
JP2004-057019 | 2004-03-02 |
Publications (1)
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WO2005083883A1 true WO2005083883A1 (ja) | 2005-09-09 |
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ID=34909005
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/003180 WO2005083883A1 (ja) | 2004-03-02 | 2005-02-25 | 波形等化器及びこれを有する情報再生装置 |
Country Status (5)
Country | Link |
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US (1) | US7535816B2 (ja) |
JP (1) | JPWO2005083883A1 (ja) |
CN (1) | CN100512002C (ja) |
TW (1) | TW200534576A (ja) |
WO (1) | WO2005083883A1 (ja) |
Families Citing this family (2)
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TWI399101B (zh) * | 2008-10-09 | 2013-06-11 | Mao Liang Liu | 預先調校型音響等化裝置 |
US9401688B2 (en) * | 2012-12-10 | 2016-07-26 | Matsue Elmec Corporation | Passive equalizer |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08147724A (ja) * | 1994-11-25 | 1996-06-07 | Matsushita Electric Ind Co Ltd | トラッキング誤差検出装置 |
JPH08162902A (ja) * | 1994-12-02 | 1996-06-21 | Matsushita Electric Ind Co Ltd | 波形等化装置 |
JPH08307208A (ja) * | 1995-05-12 | 1996-11-22 | Hitachi Ltd | 広帯域位相シフト回路 |
JP2001023167A (ja) * | 1999-07-06 | 2001-01-26 | Matsushita Electric Ind Co Ltd | 光ディスク装置及び再生方法 |
JP2002269925A (ja) * | 2001-03-09 | 2002-09-20 | Matsushita Electric Ind Co Ltd | 光ディスク再生装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0679420B2 (ja) * | 1986-06-06 | 1994-10-05 | パイオニア株式会社 | トラツキングサ−ボ装置 |
JP2963709B2 (ja) * | 1989-12-25 | 1999-10-18 | 株式会社東芝 | アナログフィルタ回路 |
JP2573081Y2 (ja) * | 1991-07-19 | 1998-05-28 | 東光株式会社 | オールパス・フィルタ |
KR970002824B1 (ko) * | 1992-05-18 | 1997-03-12 | 가부시끼가이샤 히다찌세이사꾸쇼 | 자기디스크시스템 및 그 파형등화장치 |
JP2001339263A (ja) * | 2000-05-29 | 2001-12-07 | Sony Corp | イコライザ自動調整装置及び方法、並びにデジタル記録再生装置及び方法 |
JP3584373B2 (ja) * | 2001-04-13 | 2004-11-04 | 松下電器産業株式会社 | フィルタ回路 |
-
2005
- 2005-02-25 CN CNB2005800062149A patent/CN100512002C/zh not_active Expired - Fee Related
- 2005-02-25 US US10/588,638 patent/US7535816B2/en not_active Expired - Fee Related
- 2005-02-25 JP JP2006510480A patent/JPWO2005083883A1/ja active Pending
- 2005-02-25 WO PCT/JP2005/003180 patent/WO2005083883A1/ja active Application Filing
- 2005-03-01 TW TW094106012A patent/TW200534576A/zh unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08147724A (ja) * | 1994-11-25 | 1996-06-07 | Matsushita Electric Ind Co Ltd | トラッキング誤差検出装置 |
JPH08162902A (ja) * | 1994-12-02 | 1996-06-21 | Matsushita Electric Ind Co Ltd | 波形等化装置 |
JPH08307208A (ja) * | 1995-05-12 | 1996-11-22 | Hitachi Ltd | 広帯域位相シフト回路 |
JP2001023167A (ja) * | 1999-07-06 | 2001-01-26 | Matsushita Electric Ind Co Ltd | 光ディスク装置及び再生方法 |
JP2002269925A (ja) * | 2001-03-09 | 2002-09-20 | Matsushita Electric Ind Co Ltd | 光ディスク再生装置 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2005083883A1 (ja) | 2007-11-29 |
US7535816B2 (en) | 2009-05-19 |
TW200534576A (en) | 2005-10-16 |
US20070176684A1 (en) | 2007-08-02 |
CN100512002C (zh) | 2009-07-08 |
CN1926764A (zh) | 2007-03-07 |
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