WO2004079738A1 - 復調装置及びアドレス情報抽出装置 - Google Patents
復調装置及びアドレス情報抽出装置 Download PDFInfo
- Publication number
- WO2004079738A1 WO2004079738A1 PCT/JP2004/000635 JP2004000635W WO2004079738A1 WO 2004079738 A1 WO2004079738 A1 WO 2004079738A1 JP 2004000635 W JP2004000635 W JP 2004000635W WO 2004079738 A1 WO2004079738 A1 WO 2004079738A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- carrier
- demodulator
- wave
- phase
- carrier wave
- Prior art date
Links
Classifications
-
- 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
- G11B20/14—Digital recording or reproducing using self-clocking codes
- G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/005—Reproducing
- G11B7/0053—Reproducing non-user data, e.g. wobbled address, prepits, BCA
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
- H04L27/2275—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
- H04L2027/0028—Correction of carrier offset at passband only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0044—Control loops for carrier regulation
- H04L2027/0046—Open loops
Definitions
- the present invention relates to a demodulator that demodulates a signal modulated using binary phase shift keying (BP SK), and further relates to a demodulator that extracts address information of an optical disk.
- BP SK binary phase shift keying
- BPSK is a method of modulating (0, 1) of data to (0, ⁇ ) of carrier phase, which is a method often used in the communication field.
- this modulation method is also used in the field of an optical disc, which is a type of recording medium, and is also used, for example, in DVD + RZ + RW.
- the recording track on the medium is made to swell with a fixed period, and the method to represent the address is adopted by inverting the phase of the wave (hereinafter referred to as a pull) at a specific place only. There is.
- Reading the wobble with an optical pick-up gives an analog signal with a wobble period.
- the device that detects the phase from this analog signal and reproduces the address information is nothing but a BP SK demodulator.
- the above-mentioned technology is described, for example, in JP-A-5-260413, JP-A-2001-126413, or JP-A-2001-209937.
- reference numeral 701 denotes a carrier wave regenerating circuit, which regenerates the carrier wave from the B P SK modulated signal.
- this carrier recovery circuit is a bandpass filter
- BPF Bandpass filter
- PLL PLL circuit
- the 702 receives a BPSK modulated signal, passes only the frequency band of that signal, and It is B PF which removes the noise in.
- a multiplier 703 inputs a regenerated carrier wave regenerated from the carrier wave regenerating circuit 701 and a BPSK modulated signal which has passed only that frequency band by the BPF 702, and multiplies the two.
- the reproduced carrier wave and the BPF output signal are in phase, the output value is always a positive sine wave, and in the case of an opposite phase, it is always a negative sine wave.
- LPF low-pass filter
- a judgment unit 705 compares the output of the LPF 704 with the 0 level, and outputs 1 when the value is positive and 0 when the value is negative.
- the determination result of the determination unit 705 is data before BPS K modulation.
- the demodulation device having the analog configuration shown in FIG. 7 has a problem that it is easily affected by manufacturing variations of component elements, temperature change or aging, and performance degradation easily occurs. Furthermore, when using a demodulator of such an analog configuration as an address detector of DVD + RZ + RW, the rotational speed of the optical disc is kept constant, and signal processing of recording and reproduction is performed according to the physical radius position on the optical disc. It is necessary to dynamically change the frequency characteristics of the analog filters 702 and 704 in order to cope with the CAV (Constant An- gler Velocity) method that changes the speed. In this way, the filter characteristics are tracked to the frequency change in this way It is difficult to Disclosure of the invention
- the present invention solves the above-mentioned problems, and its object is to reduce the effects of manufacturing variations and temperature changes or secular changes which cause performance deterioration, and to input the BPSK modulation signal. It is to improve the noise resistance by the noise filter which follows the frequency change.
- an analog circuit configuration that is susceptible to manufacturing variations and noise is made a digital circuit configuration that is not easily affected.
- a digital circuit configuration is used for processing of recovering the carrier from the noise power of the BPSK modulated signal and the BPSK modulated signal, By integrating the multiplication result obtained by multiplication of the modulation signal and the carrier signal with the carrier wave period, it is possible to realize a filter having a high noise removal effect by following the frequency change of the BPSK modulation signal.
- the demodulation device of the present invention comprises: carrier wave information extraction means for extracting carrier wave information possessed by a BPSK modulated signal; carrier wave generation means for generating a carrier wave based on carrier wave information extracted by the carrier wave information extraction means; An antenna digital conversion means for converting a BPSK modulated signal into a digital value, A multiplication by which the carrier wave outputted from the carrier generation means is multiplied by the BPSK modulated signal converted into a digital value by the analog digital conversion means It comprises: calculating means; carrier cycle integration means for integrating the multiplication result by the multiplication means at the cycle of the carrier wave generated by the carrier generation means; and determination means for binarizing the integration result of the carrier cycle integration means.
- the demodulation device is characterized by The demodulation device according to claim 1, wherein the BPSK modulated signal is received, a frequency band equal to or less than a carrier frequency band of the BPSK modulated signal is passed, and the signal thus passed is input to the analog-to-digital converter. It is characterized by further comprising low frequency band pass means.
- the present invention is characterized in that, in the demodulation device according to claim 1 or 2, the carrier generation means generates a sine wave as a carrier wave.
- the carrier generation means generates a triangular wave as a carrier wave.
- the carrier wave generation means has a carrier wave having an amplitude of 1 in a period from ⁇ ⁇ to ⁇ 3 as the carrier wave.
- the phase has an amplitude of 2 in the period of ⁇ / 3 to 2 ⁇ 3, an amplitude of 2 in the period of 2 ⁇ 3 to the phase of 1, and an amplitude of 1 to 4 ⁇ , 3 in the phase, and the phase is 4 ⁇ .
- a modified square wave with an amplitude of 23 to 5 ⁇ / 3 and a phase of 5 ⁇ 3 to 2 ⁇ with an amplitude of 1 and 2 is used. It is characterized by The present invention is characterized in that, in the demodulation device according to claim 1 or 2, the carrier generation means generates a square wave as a carrier wave.
- the present invention is characterized in that, in the demodulation device according to claim 1 or 2, the carrier wave information extraction unit extracts a carrier wave period as carrier wave information possessed by a BPSK modulated signal.
- the demodulation device according to claim 1 or 2 wherein a value corresponding to a phase difference between the carrier wave generated by the carrier wave generation means and the digital BPSK modulation signal converted by the analog-to-digital conversion means is used.
- the apparatus further comprises phase difference detection means for detecting the phase difference detection means, delay means for delaying the carrier wave generated by the carrier wave generation means for a predetermined time, delayed carrier wave delayed by the delay means, and the analog-to-digital conversion.
- a second multiplication means for multiplying the digital BPSK modulated signal converted by the means; and a second portable means for integrating the multiplication result of the second multiplication means with the period of the carrier wave generated by the carrier wave generation means.
- the generating means is characterized in that the subtraction result of the subtraction means is received as a phase difference detection signal, and the phase of the carrier wave to be generated is adjusted based on the subtraction result so as to eliminate the phase difference.
- the address information extraction apparatus is an address information extraction apparatus for extracting address information described on a recording medium of an optical disc, comprising: the demodulation apparatus according to claim 1 or 2; It is characterized by reproducing address information on the medium.
- the demodulation device according to claim 1, wherein the carrier wave information extraction unit extracts carrier wave information of a BPSK modulated signal converted into a digital value by the antenna digital conversion unit.
- the BPSK modulated signal is received, the frequency band below the carrier frequency band of the BP modulated signal is passed, and the passed signal is sent to the analog-to-digital converter.
- the apparatus further comprises low frequency band pass means for inputting.
- the present invention is characterized in that in the demodulation device according to claim 10, the carrier generation means generates a sine wave as a carrier.
- the present invention is characterized in that in the demodulation device according to claim 10, the carrier generation means generates a triangular wave as a carrier.
- the carrier wave generation means is a carrier wave, and assuming that the amplitude of a period from 0 to ⁇ 3 is 1 as a carrier, the phase is ⁇ / 3 to 2 ⁇ .
- Amplitude is 2 during period / 3, phase is from 2 ⁇ 3 to 1), amplitude is 1 during phase from ⁇ to 4 ⁇ / 3, phase is 1 from 1 ⁇ , phase is 4 ⁇ / 3 to 5 ⁇ / It is characterized in that it generates a modified square wave whose amplitude in the period 3 is one and whose amplitude in the period whose phase is 5 ⁇ 3 to 2 ⁇ is one.
- the carrier generation means outputs a square wave as a carrier.
- the information extracted by the carrier wave information extraction means is a carrier wave period.
- the phase difference between the carrier wave generated by the carrier wave generation means and the BPSK modulation signal converted by the analog-to-digital conversion means is provided.
- the apparatus further comprises phase difference detection means for detecting a value, wherein the phase difference detection means is delay means for delaying the carrier wave generated by the carrier wave generation means for a predetermined time period; A second multiplication means for multiplying the delayed carrier wave delayed by the delay means and the digital BPSK modulated signal converted by the analog digital conversion means; and a multiplication result of the second multiplication means
- Second carrier cycle integration means for integrating in the cycle of the carrier wave generated by the carrier generation means, and subtraction means for subtracting the integration result of the carrier cycle integration means and the integration result of the second carrier cycle integration means
- the carrier generation means receives the subtraction result of the subtraction means as a phase difference detection signal, and adjusts the phase of the carrier to be generated so as to eliminate the phase difference based on the subtraction result.
- An address information extraction apparatus is an address information extraction apparatus for extracting address information described on a recording medium of an optical disk, comprising: the demodulation apparatus according to claim 10 or 11;
- the present invention is characterized by reproducing address information on the recording medium.
- the multiplication means and the carrier cycle integration means can be configured by digital circuits, which makes it possible to suppress the performance deterioration.
- the delay carrier wave and the BPSK modulation signal can be obtained.
- a value corresponding to the phase difference can be obtained, and more accurate demodulation can be realized by correcting the phase of the carrier wave generated by the carrier wave generation means using the value corresponding to the phase difference. It becomes.
- the carrier wave information extraction means which receives a digital signal can also be constituted by a digital circuit, and it is possible to realize highly accurate demodulation with suppressed signal deterioration.
- FIG. 1 is a diagram showing a configuration of a BPSK demodulation circuit according to the first embodiment of the present invention.
- FIG. 2 shows various generated carriers.
- FIG. 3 is a diagram showing frequency characteristics of various generated carriers.
- FIG. 4 is a diagram showing a configuration of a BPSK demodulation circuit according to a second embodiment of the present invention.
- FIG. 5 is an explanatory view of phase difference detection.
- FIG. 6 is a diagram showing a configuration of a BPSK demodulation circuit according to the third embodiment of the present invention.
- FIG. 7 is a diagram showing a conventional BPSK demodulation circuit. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a block diagram of a BPSK demodulation circuit according to the present embodiment, which corresponds to the description of claims 1, 2 and 3.
- a carrier information extraction circuit (carrier information extraction means) 101 extracts a frequency component of a carrier contained in the input BPSK modulation signal as carrier information.
- a carrier generation circuit (carrier generation means) 102 generates a carrier from the frequency component of the carrier extracted by the carrier information extraction circuit 101.
- 8? 3? ⁇ Modulation signal? (Low frequency band pass means) Only the frequency band below the carrier frequency band is passed by 1 03, and an analog BPSK modulation signal is converted into a digital signal by AZ D converter (analog digital conversion means) 1 0 4 Be done.
- the generated carrier wave obtained from the carrier wave generator circuit 102 and the digital BPSK modulated signal converted by the AZD converter 104 are multiplied by a multiplier (multiplier means) 105,
- the multiplication result is the carrier cycle integration circuit (carrier cycle product Minutes) It is input to 106.
- the carrier cycle integration circuit 1 0 6 integrates the multiplication result of the multiplier 1 0 5 with the period of the carrier wave obtained by the carrier information extraction circuit 1 0 1 and the product result is determined by the determination unit (determination means) 1 0 Enter 7
- the determiner 1 0 7 makes a positive / negative decision on the value of the input carrier cycle integration result, and outputs 1 when it is positive and 0 when it is negative. This output value is the demodulation data.
- the carrier wave information extraction circuit 101 is composed of, for example, a band pass filter and a PL circuit, and the extracted information is a square wave synchronized with the BPSK modulation signal.
- various waveforms can be considered as a waveform of a generated carrier wave which is an output of the carrier wave generation circuit 102, for example, the carrier wave generation circuit 102 is a low pass filter and outputs a sine wave. It will be described in detail below.
- the sine wave generated by the carrier wave generator circuit 102 and the BPSK modulation signal output from the AZD converter 104 each have the same frequency, and only the phase is a mixture of in-phase and anti-phase waveforms. There is. When they are multiplied by the multiplier circuit 105, they become double frequency sine waves with only positive amplitude in the case of in phase, and double frequency sine waves with negative amplitude only in the case of opposite phase. It becomes.
- the output of the multiplier 1 0 5 is integrated by the carrier period integration circuit 1 0 6 with the period of the carrier wave.
- the arithmetic processing of multiplying a sine wave and integrating with the period of the sine wave is equivalent to finding the Fourier coefficient of the sine wave by just Fourier series expansion.
- a constant positive value is output in the case of in-phase
- a constant negative value is output in the case of out-of-phase.
- the arithmetic processing by the multiplier 105 and the carrier cycle integration circuit 106 can be regarded as a band pass filter that passes only the carrier frequency.
- the output of the carrier cycle integration circuit 1 06 is a positive or negative constant value, and the decision unit 1 0 7 decides whether this output is positive or negative, and makes 1 correspond when positive and 0 when negative. , Demodulated data can be output.
- a triangular wave can be mentioned as an alternative to a sine wave.
- the following method can be considered to generate a triangular wave from a square wave.
- measure the period of the square wave and let that be period T, and the value at time 0 be 0.
- a constant value a is added from time 0 to time TZ 4 and a constant value a is subtracted from time T / 4 to time 3 T / 4, and constant again from time 3 TZ 4 to time T.
- a triangular wave can be generated by a circuit that adds the signal a directly. Since this can be easily configured by the adder and the register, it can be realized by a simpler circuit than generating a sine wave.
- a modified square wave can be mentioned as an alternative to a sine wave. This corresponds to the description of claim 5.
- a constant value b is output from time 0 to time T ⁇ 6, and a constant value 2 b is output from time T 66 to time T / 3, and from time T / 3 to time TZ 2
- the modified square wave can be generated by a circuit that outputs b and outputs 1 b from 5 T / 6 to T. This can be realized by a circuit simpler than a triangular wave because it can be configured by a constant output device and a selector.
- square waves can be mentioned. This corresponds to the description of claim 6.
- the square wave may be output as it is, which can be realized by the simplest circuit.
- the frequency characteristics of the multiplier 105 and the carrier period integrator 106 are shown in FIG. 3 for the case where the generated carrier is a sine wave, triangular wave, modified square wave or square wave.
- the generated carrier is a sine wave, triangular wave, modified square wave or square wave.
- a sine wave there is a gain only in the vicinity of the carrier frequency, and the gain at other frequencies is almost 0, and it has good band-pass characteristics.
- the BPSK modulation method since information is present only at the carrier frequency, such a band pass characteristic is very effective for noise removal and also has high demodulation performance.
- a triangular wave although gain remains at a frequency between twice and three times the carrier frequency, it has a pand-pass characteristic as a whole.
- the gain at the 3 n frequency is almost 0, but the gain remains at other frequencies.
- the gain remains at the odd multiple frequency.
- the frequency characteristics are superior in the order of sine wave, triangular wave, modified square wave, and square wave It can be seen that it is sufficient to select the optimal generated carrier waveform in view of the trade-off between performance and circuit cost.
- the output of the carrier wave information extraction circuit 101 is a square wave having the same cycle as that of the BPSK modulation signal.
- the cycle is It is also effective to extract itself and output it. This corresponds to the description of claim 7.
- the BPSK demodulator is an address information extraction device that extracts address information by reading a disk on a recording medium such as an optical disk, it is also used as a address information extraction device that can realize high-accuracy demodulation. This corresponds to the description of claim 17.
- FIG. 4 shows a B P S K demodulation circuit according to this embodiment, which corresponds to the description of claim 8.
- phase difference detection circuit phase difference detection means 1 00 0 is added.
- the phase difference detection circuit 1 0 0 0 comprises a delay unit 4 0 1, a multiplier 4 0 2, a carrier cycle integration circuit 4 0 3 and a subtractor 4 0 4.
- multiplier 4 0 2 delays the output of A / D converter 1 0 4 and the generated carrier wave.
- Device (delay means) differs in that the delayed carrier delayed by a predetermined time by 4 0 1 is used as an input.
- the integration result of carrier cycle integration circuit 4 0 3 obtained by this configuration is subtracted from the integration result of carrier cycle integration circuit 1 0 6 by subtractor 4 0 4 Do.
- the subtraction result indirectly represents a function of the phase difference between the generated carrier wave and the BPSK modulation signal, and it is possible to correct the phase difference in the carrier generation circuit 102 using this subtraction result. .
- the integral value obtained by integrating the multiplication result by the carrier period draws a cosine wave with respect to the change in the phase difference between the generated carrier and the BPSK modulated signal. This is shown in Fig. 5 (a).
- the integral value is a positive maximum value, and when the phase difference is ⁇ ⁇ 2, the integral value is 0, and when the phase difference is earth ⁇ , that is, negative when the phase difference is negative.
- the maximum value of the carrier generated not through delay unit 401 is multiplied with the BPS modulation signal and integrated with the carrier period, the value obtained when integrating with the carrier period is calculated, and the carrier generated through delay unit 401 is multiplied with the BP SK modulation signal
- the value of A ⁇ B takes a negative value when the phase difference between the carrier and the BPSK modulation signal is positive, and conversely, When the phase difference is negative, it takes a positive value. That is, focusing on this relationship, it is possible to correct the phase difference using the value of A ⁇ B.
- analog processing is performed such that carrier wave information is directly extracted from the BPSK modulation signal, that is, analog BP SK modulation signal is directly input to the carrier wave information extraction circuit 101.
- the digitalized BP SK modulated signal which is the output of the AZD converter 104 is input to the carrier information extraction circuit 601 to perform digital processing.
- the carrier wave information extraction circuit 601 is entirely composed of digital circuits, and although not shown, has a band pass filter and a digital PLL circuit inside thereof. In addition, this configuration may include a band pass filter and a period measurement counter. Therefore, since the carrier wave information extraction circuit 601 is also constituted by the digital circuit, it is possible to reduce the performance deterioration of the demodulation circuit due to the analog structure, It is possible to perform demodulation with high accuracy.
- the carrier wave generated by the carrier wave generation circuit 102 can be a sine wave, a triangular wave, a modified square wave or a square wave. This corresponds to the description of claims 11-14.
- the carrier wave information extraction circuit 601 outputs the cycle itself in order to facilitate the processing in the carrier wave generation circuit 102. It is also effective to This corresponds to the description of claim 15. Furthermore, it is a matter of course that the phase difference detection circuit 1000 shown in the second embodiment may be added to the present embodiment. This corresponds to the description of claim 16.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/513,149 US7321639B2 (en) | 2003-03-07 | 2004-01-26 | Demodulator and address information extractor |
JP2005502984A JP4009302B2 (ja) | 2003-03-07 | 2004-01-26 | 復調装置及びアドレス情報抽出装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003061429 | 2003-03-07 | ||
JP2003-061429 | 2003-03-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004079738A1 true WO2004079738A1 (ja) | 2004-09-16 |
Family
ID=32958958
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/000635 WO2004079738A1 (ja) | 2003-03-07 | 2004-01-26 | 復調装置及びアドレス情報抽出装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US7321639B2 (ja) |
JP (1) | JP4009302B2 (ja) |
WO (1) | WO2004079738A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110138340A (zh) * | 2019-05-29 | 2019-08-16 | 天津大学 | 一种可调幅调相的正弦波产生装置及方法 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2967541B1 (fr) * | 2010-11-17 | 2012-11-16 | Centre Nat Etd Spatiales | Procede et dispositif de demodulation de signaux a residu de porteuse |
CN103916347B (zh) * | 2012-12-28 | 2018-02-16 | 北京中电华大电子设计有限责任公司 | 一种14443接口ook副载波解调电路 |
CN104639483B (zh) * | 2013-11-11 | 2017-10-31 | 上海华虹集成电路有限责任公司 | 基于14443‑bpsk副载波数字相关解调电路 |
CN103647738A (zh) * | 2013-12-03 | 2014-03-19 | 北京中电华大电子设计有限责任公司 | 一种14443接口bpsk副载波解调电路 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08214035A (ja) * | 1995-02-08 | 1996-08-20 | Matsushita Electric Ind Co Ltd | フェーズ・シフト・キーイング変調波復調装置 |
JP2001126413A (ja) * | 1999-11-01 | 2001-05-11 | Ricoh Co Ltd | 復調回路及びこれを用いた情報記録再生装置 |
JP2002074660A (ja) * | 2000-08-22 | 2002-03-15 | Ricoh Co Ltd | 位相復調方法、位相復調装置及び情報記録再生装置 |
JP2003263747A (ja) * | 2002-03-12 | 2003-09-19 | Hitachi Ltd | 光ディスク記録/再生装置とそのためのアドレス検出方法 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4888793A (en) * | 1988-05-06 | 1989-12-19 | Motorola, Inc. | Phase correcting DPSK/PSK receiver with digitally stored phase correction derived from received data |
JP2893496B2 (ja) | 1992-03-10 | 1999-05-24 | 株式会社富士通ゼネラル | データ伝送回路 |
US5777813A (en) * | 1994-03-11 | 1998-07-07 | Syquest Technology, Inc. | Method and apparatus for reducing sideband interference when storing or retrieving data in a disk drive system adapted for downward compatibilty |
JPH08214036A (ja) | 1995-01-31 | 1996-08-20 | Sony Corp | 直交検波回路 |
US6452977B1 (en) * | 1998-09-15 | 2002-09-17 | Ibiquity Digital Corporation | Method and apparatus for AM compatible digital broadcasting |
US6345018B1 (en) * | 1999-08-04 | 2002-02-05 | Ricoh Company, Ltd. | Demodulation circuit for demodulating wobbling signal |
JP2001209937A (ja) | 2000-01-27 | 2001-08-03 | Ricoh Co Ltd | 復調装置及び情報記録再生装置 |
JP3481574B2 (ja) * | 2000-09-19 | 2003-12-22 | 沖電気工業株式会社 | 復調装置 |
US7079599B2 (en) * | 2001-02-28 | 2006-07-18 | Broadcom Corporation | Multi-mode quadrature amplitude modulation receiver for high rate wireless personal area networks |
US7103098B2 (en) * | 2002-03-15 | 2006-09-05 | Intel Corporation | Adaptive receiver for multiplex/multi-access communications |
JP2003283747A (ja) | 2002-03-20 | 2003-10-03 | Ricoh Co Ltd | 画像処理装置および方法 |
-
2004
- 2004-01-26 US US10/513,149 patent/US7321639B2/en not_active Expired - Fee Related
- 2004-01-26 JP JP2005502984A patent/JP4009302B2/ja not_active Expired - Fee Related
- 2004-01-26 WO PCT/JP2004/000635 patent/WO2004079738A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08214035A (ja) * | 1995-02-08 | 1996-08-20 | Matsushita Electric Ind Co Ltd | フェーズ・シフト・キーイング変調波復調装置 |
JP2001126413A (ja) * | 1999-11-01 | 2001-05-11 | Ricoh Co Ltd | 復調回路及びこれを用いた情報記録再生装置 |
JP2002074660A (ja) * | 2000-08-22 | 2002-03-15 | Ricoh Co Ltd | 位相復調方法、位相復調装置及び情報記録再生装置 |
JP2003263747A (ja) * | 2002-03-12 | 2003-09-19 | Hitachi Ltd | 光ディスク記録/再生装置とそのためのアドレス検出方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110138340A (zh) * | 2019-05-29 | 2019-08-16 | 天津大学 | 一种可调幅调相的正弦波产生装置及方法 |
CN110138340B (zh) * | 2019-05-29 | 2024-03-26 | 天津大学 | 一种可调幅调相的正弦波产生装置及方法 |
Also Published As
Publication number | Publication date |
---|---|
US20050169404A1 (en) | 2005-08-04 |
JPWO2004079738A1 (ja) | 2006-06-08 |
JP4009302B2 (ja) | 2007-11-14 |
US7321639B2 (en) | 2008-01-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6304538B1 (en) | Information reproducing apparatus for reproducing digital information on record medium | |
US7791996B2 (en) | PLL circuit operating based on output of delta-sigma modulator, and optical disk device including PLL circuit | |
WO2007037272A1 (ja) | クロック信号生成装置 | |
JP3494405B2 (ja) | 復調回路、これを用いた情報記録再生装置、位相復調システム及び位相差除去方法 | |
US20030099180A1 (en) | Apparatus and method for encoding wobble signal to be recorded on optical disc, and apparatus and method for decoding wobble signal read from optical disc | |
US5121057A (en) | Media flaw detection apparatus for a magnetic disk drive with squaring and summing of in-phase and quadrature-phase detected signals | |
WO2004079738A1 (ja) | 復調装置及びアドレス情報抽出装置 | |
JP3803641B2 (ja) | デジタルagc回路 | |
KR100960983B1 (ko) | 워블신호의 신호처리방법, 광디스크의 기록과 재생방법,광디스크장치, 프로그램, 및 기록매체 | |
JP3961751B2 (ja) | 位相復調方法、位相復調装置及び情報記録再生装置 | |
JP4050603B2 (ja) | ウォブル信号処理装置 | |
JP2007042201A (ja) | 光ディスク装置及び光ディスクのウォブル再生方法 | |
JP3944475B2 (ja) | 位相調整回路及び復調回路 | |
JP4032621B2 (ja) | Fm復調装置 | |
CN100377219C (zh) | 光盘抖动信号的调制解调装置及方法 | |
KR100723515B1 (ko) | 워블 신호 검출기 및 워블 신호 검출 방법 | |
US20070097827A1 (en) | Method and apparatus for detecting saw-tooth wobble signal to reproduce information recorded on an optical disk | |
JP4197467B2 (ja) | 情報再生装置および方法 | |
JP3919593B2 (ja) | クロック再生装置、クロック再生方法及びプログラム | |
JP2009158035A (ja) | 光ディスク記録再生装置 | |
JP2005158239A (ja) | 光ディスク装置、クロック信号生成方法、プログラムおよび制御装置 | |
KR100589810B1 (ko) | 광디스크 기록 및/또는 재생장치 | |
JP3785884B2 (ja) | ディスク装置 | |
JP2007004878A (ja) | 光ディスク装置 | |
JP2009170004A (ja) | 光ディスク装置及び光ディスク装置の制御方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2005502984 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10513149 Country of ref document: US |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
122 | Ep: pct application non-entry in european phase |