WO2005027122A1 - 位相誤差検出回路及び同期クロック抽出回路 - Google Patents
位相誤差検出回路及び同期クロック抽出回路 Download PDFInfo
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- WO2005027122A1 WO2005027122A1 PCT/JP2004/008594 JP2004008594W WO2005027122A1 WO 2005027122 A1 WO2005027122 A1 WO 2005027122A1 JP 2004008594 W JP2004008594 W JP 2004008594W WO 2005027122 A1 WO2005027122 A1 WO 2005027122A1
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- phase error
- reference value
- detection circuit
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- 238000001514 detection method Methods 0.000 title claims abstract description 347
- 238000000605 extraction Methods 0.000 title claims abstract description 17
- 230000001360 synchronised effect Effects 0.000 claims abstract description 33
- 230000000630 rising effect Effects 0.000 claims description 219
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 35
- 230000003287 optical effect Effects 0.000 claims description 19
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 230000005856 abnormality Effects 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 abstract description 15
- 238000010586 diagram Methods 0.000 description 26
- 230000002159 abnormal effect Effects 0.000 description 13
- 238000012545 processing Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 11
- 238000012935 Averaging Methods 0.000 description 7
- 238000012937 correction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
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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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- 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
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
-
- 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
- H04L7/0334—Processing of samples having at least three levels, e.g. soft decisions
Definitions
- the present invention is used for extracting a synchronization clock from a recording medium such as an optical disk or a magnetic disk in a reproduction signal processing circuit for extracting data recorded on the recording medium and extracting a synchronization clock synchronized with the data.
- Phase error detection circuit to be used. Background art
- FIG. 12 shows an example of a reproduction signal processing circuit in a conventional optical disk device.
- 1 is a recording medium such as an optical disk
- 2 is an optical pickup
- 3 is a analog front end
- 12 is a digital signal processing circuit.
- 4 is an AZD converter
- 5 is a digital filter
- 6 is a decoder
- 13 is a synchronous clock extraction circuit.
- 7 is a phase comparator
- 8 and 11 are loop filters
- 9 is a VCO (voltage controlled oscillator)
- 10 is a frequency comparator.
- the recording medium 1 When reproducing data written on the recording medium 1 such as an optical disk, first, irradiate the recording medium 1 with laser light, capture the reflected light with the optical pickup 2, and convert the intensity of the reflected light into an electric signal. Convert to generate an analog reproduction signal.
- the analog reproduced signal obtained by the optical pickup 2 is subjected to gain adjustment of signal amplitude and DC offset adjustment at the analog front end 3, and boosting of high-frequency components and noise removal for the purpose of waveform equalization. .
- Waveform equalized by analog front end 3 The analog reproduction signal is quantized by the AZD converter 4 to become digital data.
- the subsequent stage is digital signal processing.
- the reproduced data quantized by the A / D converter 4 is subjected to waveform correction processing by the digital filter 5, and is decoded by the decoder 6 to become binary data.
- the reproduced data quantized by the A / D converter 4 is input to a synchronous clock extraction circuit 13.
- the frequency comparator 10 calculates the frequency error between the reproduced data and the clock output from the VCO 9, and the loop filter 11 filters the frequency error output from the frequency comparator 10.
- VC09 changes the frequency of the output clock according to the frequency error value smoothed by the loop filter 11.
- the phase comparator 7 calculates the phase error between the reproduced data and the clock output from the VCO 9, and the loop filter 8 filters the phase error output from the phase comparator 7.
- the VC09 changes the frequency of the output clock according to the value of the phase error smoothed by the loop filter 8. By this feedback loop, control is performed so that the frequency error and phase error of the clock output from VC09 become zero.
- the operation of the synchronous clock extraction circuit 13 is first performed in the order of frequency error correction and then phase error correction.
- the clock output from the VCO 9 is also supplied to the digital signal processing circuit 12 including the AZD converter 4, and when the frequency control and the phase control are in a steady state, the output clock of the VC09 is synchronized with the reproduced data. It becomes a clock.
- a conventional configuration of the phase comparator 7 in such a synchronous clock extraction circuit is described in, for example, Japanese Patent Application Laid-Open No. H8-17145. Below, the conventional configuration of the phase comparator 7 Figure 13 shows an example.
- the phase comparator 7 includes a zero-cross detection circuit 74 and a phase error calculation circuit 75.
- the zero cross detection circuit 74 detects a zero cross point from the reproduced data and outputs a zero cross detection signal.
- the phase error calculation circuit 75 outputs the phase error data at the timing of the zero cross detection signal using the reproduced data as an input signal, the zero cross detection signal as an enable signal.
- FIG. 14 An example of a conventional configuration of the zero-crossing detection circuit 74 is shown in FIG.
- the open cross detection circuit 74 of FIG. 14 includes an averaging circuit 741, a D flip-flop 742, and an exclusive OR circuit 743.
- the averaging circuit 741 calculates an average value of two consecutive pieces of reproduction data, and outputs the sign data.
- the D flip-flop 742 delays the code data from averaging circuit 741 by one clock.
- the coded data exclusive OR circuit 743 receives two coded data, that is, the coded data of the average value output from the averaging circuit 741 and the coded data delayed by the D flip-flop 742, and codes the coded data. Detects the points where is inverted from positive to negative and from negative to positive.
- the output of the exclusive OR circuit 743 becomes the zero cross detection signal of the zero cross detection circuit 74.
- FIG. This figure shows how to detect the zero cross point at the time of the rising edge of the reproduction data. The circles indicate the sampling points of the reproduced data.
- Crosses (X) indicate the two averages before and after each.
- the sign of the average value of the code data a (n-1) and the next code data a (n) is positive, and the average value of the code data a (n) and the average value of the next code data a (n + 1) is positive. Since the sign is negative, sign data a in the middle (n) is determined to be a zero cross point.
- the phase error is calculated based on the value of the code data a (n) and the direction of the cross edge.
- FIG. 16 shows the issues with the conventional zero-cross detection method.
- This figure shows the state of Z cross detection for a reproduced waveform of 3T + 3T (T is a channel period).
- FIG. 11A shows a state in which zero cross detection is normally performed using the zero cross detection method described in FIG.
- the playback data is synchronized with the sampling clock, the zero cross point is correctly detected.
- the frequency error between the reproduced data and the sampling clock is large, as shown in Fig. 11 (b), the phase inversion occurs at a certain point and the zero cross point is erroneously detected.
- the conventional phase error comparison method has a problem that the capture range is small because the input linear range is narrow. Disclosure of the invention
- the phase error detection circuit of the present invention extracts a synchronous clock synchronized with the reproduced data itself based on the reproduced data quantized and reproduced from the recording / reproducing device.
- a phase error detection circuit used to output the data, receiving a predetermined reference value while receiving the reproduction data, and detecting a cross timing at which the reproduction data crosses the reference value;
- a phase error calculator that receives the reproduced data and a cross timing signal of the cross detector, and calculates a difference between the reproduced data and the zero value at the cross timing as phase error data; and a phase error data of the phase error calculator.
- a cross reference value generation unit that updates the reference value of the cross detection unit based on the phase error data.
- the present invention provides the phase error detection circuit, wherein, each time the phase error calculation unit calculates phase error data, the cross reference value generation unit outputs the calculated latest phase error data to the cross detection unit. It is characterized in that it is updated as a reference value.
- the cross detection unit may include a rising cross detection unit configured to detect a rising cross timing at which the reproduction data crosses the reference value at a rising edge; A falling cross detection unit that detects a falling cross timing at which the reference value crosses at the falling time.
- the present invention provides the phase error detection circuit, wherein the phase error calculation unit receives a rising cross timing signal of the rising cross detection unit, and calculates a difference between the reproduction data and the reference value at the rising cross timing. The difference is calculated as rising phase error data, and the difference between the reproduced data and the reference value at the falling cross timing is received at the falling cross timing in response to the falling cross timing signal of the falling cross detection unit. It is characterized in that it is calculated as error data.
- the cross reference value generation unit receives rising phase error data and falling phase error data of the phase error calculation unit, The rising phase error data is output to the rising cross detection section as a rising reference value, and the falling phase error data is output to the falling cross detection section as a falling reference value.
- the cross reference value generation unit may receive rising phase error data of the phase error calculation unit, and output the rising phase error data to the rising cross detection unit as a rising reference value.
- the rising phase error data obtained by inverting the sign of the rising phase error data is output to the falling cross detection section as a falling reference value.
- the cross reference value generation unit receives falling phase error data of the phase error calculation unit, and a falling phase after inverting a sign of the falling phase error data.
- the error data is output to the rising cross detection section as a rising reference value
- the falling phase error data is output to the falling cross detection section as a falling reference value.
- the cross reference value generator receives the rising phase error data and the falling phase error data of the phase error calculator, and the input rising phase error data and falling phase
- the 1Z2 value of the sum of the error data is calculated, and the 1/2 value of this sum and its sign-inverted value are used as the rising reference value and the falling reference value by the rising cross detection unit and the falling cross detection unit.
- the cross reference value generation unit has a configuration in which a reference value of the cross detection unit is fixed to a zero value, and is based on phase error data in the cross reference value generation unit. Switch between updating the reference value and fixing the reference value to zero A control signal generator for outputting a control signal to the cross reference value generator.
- the control signal generation unit receives the phase error data of the phase error calculation unit, and receives a phase error in the cross reference value generation unit according to a phase error indicated by the phase error data. It is characterized in that a control signal is generated so as to switch between updating the reference value based on the error data and fixing the reference value to zero.
- the control signal generation unit in the phase error detection circuit, the control signal generation unit generates a reference value when the phase error indicated by the received phase error data becomes smaller than a predetermined value and approaches a steady state.
- the control signal is output so as to switch from updating the reference value based on the error data to fixing the reference value to zero.
- the control signal generation unit in the phase error detection circuit, when the phase error indicated by the received phase error data is equal to or greater than a predetermined threshold, the control signal generation unit updates a reference value based on the phase error data.
- a control signal is generated such that the reference value is fixed to a zero value when the value is less than the threshold value.
- the control signal generation unit receives a predetermined signal from outside the phase error detection circuit, and in accordance with the predetermined signal from outside, the control signal generation unit A control signal is generated so as to switch between updating of the reference value based on the phase error data and fixing of the reference value to zero.
- the control signal generation unit when receiving a signal output when a specific pattern of the reproduction data is detected as the predetermined signal from the outside, Generation is updated based on the phase error data. The control signal is output so as to switch from the new value to the fixed value of the reference value.
- a signal output when a specific pattern of the reproduction signal is detected is a sync detection signal generated when an interval between sync marks on an optical disc is detected. It is characterized by.
- the present invention provides the phase error detection circuit, wherein the control signal generation unit receives an abnormality detection signal generated when an abnormality occurs in the reproduction data, and a reference based on the phase error data in the cross reference value generation unit. It is characterized in that the updating of the value is reset to a predetermined reference value.
- the control signal generation unit receives the phase error data of the phase error calculation unit, receives a predetermined signal from outside the phase error detection circuit, A control signal is generated so as to switch between updating of a reference value based on the phase error data in the cross reference value generation unit and fixing of the reference value to a zero value in accordance with the phase error indicated by and the external predetermined signal. It is characterized by doing.
- the synchronous clock extraction circuit of the present invention receives the phase error detection circuit, and phase error data output from the phase error detection circuit, and changes the frequency of the synchronous clock according to the phase error indicated by the phase error data. And a voltage controlled oscillator for causing the voltage to be controlled.
- the present invention provides the phase error detection circuit, further comprising: a threshold generation unit that generates a threshold used for updating a reference value of the cross detection unit, wherein the cross reference value generation unit includes: Receiving a threshold value of the threshold value generation unit, and updating a reference value of the cross detection unit based on the threshold value and phase error data of the phase error calculation unit.
- the threshold value generation unit receives the phase error data of the phase error calculation unit, receives predetermined threshold data from outside, and receives the absolute value of the phase error data and the predetermined value. The smaller one of the absolute values of the threshold data is set as the threshold.
- the present invention is characterized in that in the phase error detection circuit, the threshold value generation section generates a rising cross timing threshold value and a falling cross timing threshold value.
- the cross detection unit may include a rising cross detection unit configured to detect a rising cross timing at which the reproduction data crosses the reference value at a rising edge; A falling cross detection unit that detects a falling cross timing at which the reference value crosses at the falling time.
- the present invention provides the phase error detection circuit, wherein the phase error calculation unit receives a rising cross timing signal of the rising cross detection unit, and calculates a difference between the reproduction data and the reference value at the rising cross timing.
- the cross reference value generation unit may include: In response to the rising phase error data of the phase error calculation unit and the rising cross timing threshold of the threshold generation unit, the smaller of the absolute value of the rising phase error data and the absolute value of the rising cross timing threshold is calculated.
- the absolute value of the falling phase error data and the It is characterized in that the smaller one of the absolute values of the falling cross timing threshold is used as the falling reference value.
- the present invention provides the phase error detection circuit, wherein the cross reference value generation unit receives the rising phase error data of the phase error calculation unit and a rising cross timing threshold of the threshold value generation unit, Out of the absolute value of the rising cross timing threshold and the absolute value of the threshold value for the rising cross timing, the smaller absolute value is used as the rising reference value, and the value obtained by inverting the sign of the rising reference value is used as the falling reference value.
- the cross reference value generation unit may receive the falling phase error data of the phase error calculation unit and a falling cross timing threshold of the threshold generation unit, and Of the absolute value of the phase error data and the absolute value of the falling cross timing threshold, the smaller absolute value is used as the falling reference value, and the value obtained by inverting the sign of the falling reference value is used as the rising reference value. It is characterized by the following.
- the cross reference value generation unit may be configured to calculate an absolute value of a rising phase error data of the phase error calculation unit and an absolute value of a rising edge timing threshold of the threshold generation unit. The smaller absolute value of the absolute value of the falling phase error data of the phase error calculator and the falling cross timing of the threshold generator.
- the cross reference value generation unit includes a reference based on a threshold value of the threshold value generation unit and phase error data of the phase error calculation unit as a reference value of the cross detection unit.
- a reference circuit of a zero value is provided, and a selection circuit for selecting one of the reference value of the zero value and a reference value based on the threshold value and the phase error data is provided. .
- the present invention is characterized in that, in the phase error detection circuit, a control signal generation unit that generates a control signal for switching a selection circuit of the cross reference value generation unit to a zero reference value side is provided.
- the control signal generation unit receives the phase error data calculated by the phase error calculation unit, and when the value of the phase error data converges to less than a predetermined value, The control signal is generated, and the control signal is output to a selection circuit of the cross reference value generation unit.
- the control signal generation unit may detect an interval between sync marks recorded on the optical disc when the recording / reproducing apparatus is reproducing data from the optical disc.
- the control signal is occasionally generated, and the control signal is output to a selection circuit of the cross reference value generation unit.
- the present invention provides the phase error detection circuit, wherein the threshold value generation unit includes: a gradually decreasing circuit that gradually decreases a predetermined threshold value; and the predetermined threshold value and the threshold value gradually decreased by the gradually decreasing circuit. And a switching signal generation unit that generates a switching signal for switching the selection circuit to the gradually decreasing circuit side.
- the switching signal generation unit in the phase error detection circuit, the switching signal generation unit generates the switching signal when the number of zero crosses of the reproduction data is less than a predetermined value during a predetermined period, and outputs the switching signal to the selection circuit. It is characterized by outputting.
- the present invention is characterized in that in the phase error detection circuit, the threshold value generation unit includes a selection circuit that receives a control signal from the outside and selects a threshold value of zero.
- the cross reference value generation unit has a gain adjustment circuit that adjusts the value of the phase error data of the phase error calculation unit to a predetermined multiple.
- the synchronous clock extraction circuit includes: a phase error detection circuit; and phase error data output from the phase error detection circuit. The synchronous clock extraction circuit receives the phase error data according to the phase error indicated by the phase error data. A voltage-controlled oscillator for changing the frequency.
- the phase error data detected in the previous process is fed back as a reference value, updated, and the reproduced data at the timing when the reference value crosses the reproduced signal is used as the next cross detection signal. Since the phase error data of the cross detection signal is detected, even if the reproduced data and the sampling clock are not synchronized, the phase error can be detected accurately, expanding the capture challenge. It is possible to do.
- the phase error becomes small and approaches a steady state, it is possible to shift to the zero-crossing method in which the cross timing between the reproduced signal and the zero value is generated as a cross detection signal. Detection can be performed efficiently and stably.
- the reference value is larger than a set threshold value, the reference value is limited to the set threshold value, Since the value is within an appropriate range, it is possible to withstand the jitter of the reproduced signal, and the phase error can be more accurately detected.
- FIG. 1 is a diagram illustrating a phase error detection circuit according to a first embodiment of the present invention.
- FIG. 2 is a diagram showing an internal configuration of a rising crossing detection unit included in the phase error detection circuit.
- FIG. 3 is a diagram showing an internal configuration of a phase error calculation unit included in the phase error detection circuit.
- FIG. 4 is a diagram illustrating an internal configuration of a cross reference value generation unit included in the phase error detection circuit.
- FIG. 5 is a diagram showing a state of a phase error detection method of the phase error detection circuit of the same embodiment.
- FIG. 6 is a diagram illustrating an aspect of a phase error detection method of the phase error detection circuit according to the second embodiment of the present invention.
- FIG. 7 is a diagram illustrating an aspect of a phase error detection method of the phase error detection circuit according to the third embodiment of the present invention.
- FIG. 8 is a diagram illustrating an aspect of a phase error detection method of a phase error detection circuit according to a fourth embodiment of the present invention.
- FIG. 9 shows the internal structure of the control signal generation unit included in the phase error detection circuit according to the first embodiment.
- FIG. 10 is a diagram illustrating a state of a phase error detection method of a phase error detection circuit according to a fifth embodiment of the present invention.
- FIG. 11 is a diagram illustrating a state of a phase error detection method of a phase error detection circuit according to a sixth embodiment of the present invention.
- FIG. 12 is a diagram showing a phase error detection circuit according to a ninth embodiment of the present invention.
- FIG. 13 is a diagram illustrating an internal configuration of a threshold value generation unit included in the phase error detection circuit.
- FIG. 14 is a diagram showing an internal configuration of a cross reference value generation unit included in the phase error conversion circuit.
- FIG. 15 is a diagram showing a state of the cross data detection method of the phase error detection circuit.
- FIG. 16 is a diagram illustrating the internal configuration of the reference value generation unit included in the phase error detection circuit according to the tenth embodiment of the present invention.
- FIG. 17 is a diagram showing a state of the cross data detection method of the phase error detection circuit.
- FIG. 18 is a diagram illustrating the internal configuration of the cross reference direct generation unit included in the phase error detection circuit according to the eleventh embodiment of the present invention.
- FIG. 19 is a diagram showing a state of the cross data detection method of the phase error detection circuit.
- FIG. 20 is a diagram showing a state of the cross data detection method when the same-phase error detection circuit is modified.
- FIG. 21 is a diagram illustrating a state of a cross data detection method of the phase error detection circuit according to the 12th embodiment of the present invention.
- FIG. 22 is a diagram showing a state of a cross data detection method of the phase error detection circuit according to the thirteenth embodiment of the present invention.
- FIG. 23 is a diagram showing a conventional general reproduction signal processing circuit for an optical disk.
- FIG. 24 is a diagram showing an internal configuration of a phase comparator included in the conventional reproduction signal processing circuit.
- Figure 25 shows the internal structure of the zero-crossing detection circuit of the conventional phase comparator. It is.
- FIG. 26 is a diagram showing a state of the conventional zero-cross detection method of the phase comparator.
- Fig. 27 (a) is an explanatory diagram of the conventional phase comparator, in which zero-crossing detection is performed normally when the reproduction data and sampling data are synchronized.
- Fig. 27 (b) shows the reproduction data and sampling.
- FIG. 9 is an explanatory diagram of a case where a frequency error with data is large and an erroneous detection occurs at a zero cross point.
- FIG. 1 shows a configuration of a phase error detection circuit according to a first embodiment of the present invention.
- the phase error detection circuit shown in the figure is a phase comparator provided in the synchronous clock extraction circuit 13 of the digital signal processing circuit 12 in the reproduction signal processing circuit of the optical disk device (recording / reproducing device) shown in FIG. It is used instead of 7. Therefore, the configurations of the synchronous peak extraction circuit and the reproduction signal processing circuit having the phase error detection circuit are the same as those in FIG. 12, and the description thereof is omitted.
- 700 is a phase detected and output from the reproduced data reproduced from the recording / reproducing apparatus and AD-converted (quantized) by the AZD converter 4 shown in FIG. 23.
- phase error detection circuit 700 which is incorporated in the synchronous clock extraction circuit 13 shown in FIG. 12 in place of the phase comparator 7, and the phase error data output from the phase error detection circuit 700 is as described above.
- the frequency is input to a VCO (voltage controlled oscillator) 9 via a loop filter 8, and the frequency of a synchronous clock to be output is changed according to the phase error of the input phase error data.
- reference numeral 70 denotes a cross detection unit that performs cross detection from quantized reproduction data, and a rising cross detection unit 70a that performs cross detection when the reproduction data rises.
- a falling cross detector 70b for detecting a cross at the time of falling of the reproduction data.
- 71 is a phase error calculator
- 72 is a cross reference value generator
- 73 is a control signal generator.
- PBD reproduction data
- PED phase error data
- S1 is a rising cross detection signal output from the rising cross detection section 70a
- S2 is a rising cross detection signal output from the falling cross detection section 70b.
- the falling cross detection signal S 3 is the rising phase error data output from the phase error calculator 71
- S 4 is the falling phase error data also output from the phase error calculator 71
- S 5 is the The rising cross reference value output from the cross reference value generator 72
- S6 is the falling cross reference value output from the cross reference value generator 72
- S7 is the output from the control signal generator 73.
- the control signal S8 is an external signal from an external circuit of the phase error detection circuit 700.
- FIG. 2 shows an example of the internal configuration of the rising cross detector 70a included in the cross detector 70.
- 70a-1 is an averaging circuit for calculating the average value of two continuous reproduced data
- 70a_2 is a D flip-flop
- 70a — 4 is a subtractor
- 70 a — 5 is a logic circuit
- PBD reproduced data
- S 1 is a rising cross detection signal
- S 5 is a rising cross reference value.
- the internal configuration of the falling cross detector 70b is the same as that of the rising cross detector 70a.
- the rising cross detector 70a receives the quantized reproduction data PBD and the rising cross reference value S5.
- the averaging circuit 7 0 a — 1 is two consecutive Calculate the average value of the playback data PBD.
- the subtractor 70a-4 subtracts the rising cross reference value S5 from the average value obtained by the averaging circuit 70a-1, and encodes the sign data obtained based on the rising cross reference value S5. Output.
- the code data delayed by one clock in the D flip-flop 70a-2 and the code data of the output of the subtractor 70a-4, that is, two code data continuous in time is detected.
- the output of the logic circuit 70a-5 becomes the rising cross detection signal S1 of the rising cross detector 70a.
- the falling cross detection unit 70b detects a point where the sign data input to the logic circuit 70a-5 changes from a positive value to a negative value, and outputs a falling cross detection signal S2. I do.
- FIG. 3 shows an example of the internal configuration of the phase error calculator 71 shown in FIG.
- 71a is a timing adjustment circuit
- 71b is a direction discrimination circuit
- 71c to 71f are selectors
- 71g to 71i are D flip-flops
- PBD is reproduced data.
- PED is phase error data
- S1 is a rising cross detection signal
- S2 is a falling cross detection signal
- S3 rising phase error data
- S4 falling phase error data
- RST is a reset signal.
- the reproduction data PBD, the rising cross detection signal S1, the falling cross detection signal S2, and the reset signal RST are input to the phase error calculation unit 71.
- the timing adjustment circuit 71a adjusts the timing of the input reproduced data PBD and outputs the adjusted data.
- the direction determination circuit 7 lb determines the direction of the rising cross or the falling cross with respect to the timing-adjusted reproduction data PBD, and determines the value of the reproduction data PBD, that is, the value of the reproduction data.
- phase error data PED via D flip-flop 71 h
- the direction discriminating circuit 71b determines that the change direction is a rising cross
- the rising phase error data S3 is output via two selectors 71c and 71d and a D flip-flop 71g.
- the direction discriminating circuit 71b determines that the direction of change is a falling cross
- the falling is performed via two selectors 71e, 71f and a D flip-flop 71i.
- the selector 7lc for the rising phase error data S3 receives the rising cross detection signal S1, and when the value of the signal S1 is "1", the direction discriminating circuit 7 Select the playback data PBD from 1b, and if it is "0", select the data held by the D flip-flop 71g (previous playback data PBD). Further, another selector 71 d for the rising phase error data S 3 selects the data from the selector 71 c in the normal state where the value of the reset signal RST is ⁇ 0 '',
- the configuration of the selectors 71 e and 71 f for the falling phase error data S 4 is the same as the above configuration.
- FIG. 4 shows a configuration example of the cross reference value generation unit 72 shown in FIG.
- 72 a and 71 b are sign inverting circuits
- 72 c is a multi-input selection circuit composed of a selector
- 72 d is a predetermined fixed value. Zero value, used to fix the reference value to zero.
- S3 is the rising phase error data
- S4 is the falling phase error data
- S5 is the rising cross reference value
- S6 is the falling cross reference value
- S7 is the control signal.
- the latest rising phase error data S 3 and falling phase error data S 4 calculated by the phase error calculator 71 and the control signal S 7 are input to the cross reference value generator 72.
- the multi-input selection circuit 72c uses the control signal S7 as a select signal, and
- the rising phase error data S 3 the data obtained by inverting the sign of the rising phase error data S 3 by the sign inverting circuit 72 a, the falling phase error data S 4, and the falling phase error data by the sign inverting circuit 72 b
- the data is switched when any of the sign-inverted data is updated, that is, when the reference value is updated based on the phase error data, and when the reference value is fixed to a fixed value of 72 d.
- the output of the multi-input selection circuit 72c is used as it is as the rising cross reference line S5 and the falling cross reference value S6.
- a series of operations for detecting phase error data in the phase error detection circuit 700 which is partially constituted by the cross detection unit 70, the phase error calculation unit 71, and the cross reference value generation unit 72 described above, will be described. .
- the cross detection unit 70 receives the reproduction data, the rising cross reference value S5, and the falling cross reference value S6, and when the reproduction data rises, the rising cross detection unit 70a outputs the reproduction data.
- the falling cross detector 70b detects the rising Z falling cross.
- the phase error calculation section 71 receives the reproduced data, the rising cross detection signal S1 and the falling cross detection signal S2 from the cross detection section 70, and receives the phase error data PED and the rising phase error data S3. And the falling phase error data S 4 are output.
- the cross reference value generation unit 72 receives the rising phase error data S 3 and the falling phase error data S 4 from the phase error calculation unit 71 and receives them as the latest rising / falling cross reference. Output as values S5 and S6.
- phase error data holes 1 are updated as reference values for the next cross detection.
- the circles represent the sampling points of the reproduced data, among which the black circles represent the phase error data points to be detected
- Lr represents the rising cross reference level
- Lf represents the falling cross reference level.
- PE1, PE2, PE3, and PE4 indicate phase error data holes 1, respectively.
- the next rising phase error PE3 is detected by using the level of the phase error data PE1 detected at the time of rising as a rising reference value level Lr and using it as the next rising cross reference value.
- the level of the phase error data PE2 detected at the time of falling is used as a falling reference value level Lf as the next falling cross reference value, and the next falling phase error PE4 is detected.
- the feedback is used as the reference value for detecting the cross point of the rising / falling phase error of the next reproduced data using the rising phase error data S 3 and the falling phase error data S 4 calculated one process before. Form a loop.
- the reference value generated by the cross reference value generation section 72 is different from that of the first embodiment. That is, using the rising phase error data S3 input to the cross reference value generation unit 72 of FIG. 1, the rising cross detection unit 70a outputs the rising cross reference value S5 to the falling cross detection unit 70a. The rising cross reference value S5 having the same absolute value and inverted sign is output to 70b. This will be described with reference to FIG. Using the level Lr of the phase error data point PE1 at the rising edge as the reference value, the next phase error data point PE3 at the rising edge is detected, and the phase error data points PE2 and PE4 at the falling edge are detected. Uses a value obtained by inverting the sign of the level Lr of the phase error data point PE1 at the time of rising as a reference value.
- phase error detection circuit according to the third embodiment will be described.
- another embodiment of the generation of the reference value will be described. That is, using the falling phase error data S4 input to the cross reference value generation unit 72, the falling cross reference value S6 is output to the falling cross detection unit 70b, and the rising cross detection is performed. A falling cross reference value S6 having the same absolute value and inverted sign is output to the unit 70a. This will be described with reference to FIG. 7.
- the phase error data point PE 4 at the next falling edge is detected, and the rising edge is detected.
- a value obtained by inverting the sign of the level Lf of the phase error data point PE2 at the time of falling is used as a reference value.
- phase error detection circuit according to a fourth embodiment will be described.
- still another embodiment of the generation of the reference value will be described. That is, using the rising phase error data S3 and the falling phase error data S4 input to the cross reference value generation unit 72 in FIG. 1, an average value of these two data is calculated. Then, the calculated average value is output as a rising cross reference value S5 to the rising cross detection unit 70a, and a sign is added to the absolute value of the calculated average value to the falling cross detection unit 70b. The inverted value is output as the falling cross reference value S6.
- the above operation will be described with reference to FIG.
- the average value which is a half value of the sum thereof is obtained. Is calculated.
- the reference value for detecting the next rising phase error data point is the average value (Lr + Lf) Z2, and the reference value for detecting the next falling phase error data point. Is used, the sign-inverted average value (Lr + Lf) / 2 is used.
- FIG. 9 shows an example of the internal configuration of the control signal generation unit 73.
- 731 is a comparison circuit
- 732 is a predetermined threshold value
- 733 is a switching determination circuit
- PED is phase error data
- S7 is a control signal
- S8 is This is an external signal.
- the comparison circuit 731 compares the input threshold value 732 with the value obtained by adding the phase error data PED, and outputs the comparison result to the switching determination circuit 733.
- the switching determination circuit 733 receives the comparison result of the comparison circuit 731 and the external signal S8, and outputs a control signal S7 for controlling the cross reference ⁇ t generation unit 72 based on the signals.
- the control signal generation unit 73 monitors the phase error data of the phase error calculation unit 71, and when the phase error becomes smaller than the threshold value 732 of a predetermined value and approaches the steady state, the control signal S7 for switching to the zero-cross detection method. Is output to the cross reference value generator 72. When such a control signal S7 is output, Upon receiving the control signal S7, the cross reference value generation unit 72 selects the fixed value (that is, the zero value) 72d in the multi-input selection circuit 72c in FIG.
- PE1 to PE8 are phase error data points, and the range enclosed by broken lines in the figure is a steady state determination area for determining that the phase error is smaller than the threshold value and is in a steady state.
- the steady state starts from the phase error data point PE2.
- the number of phase error data points is counted, and when the counted number exceeds the threshold 732, the rising and falling cross reference values S5 and S6 are used as references. Is switched from the feedback detection method to the zero-cross detection method that sets the reference value to zero.
- the rising and falling cross reference values S5 and S6 are sequentially updated and used as the reference data for the next cross detection.
- a zero value is output as a reference value from the cross reference value generation unit 72, and the conventional zero cross point detection method is performed, so that efficient phase error detection can be realized.
- phase error detection circuit shows a modification of switching from the characteristic feedback detection method of the present invention to the zero-cross detection method.
- the control signal generation unit 73 shown in FIG. 9 receives the phase error data PED, compares the value of the phase error indicated by the data with a predetermined threshold value 732, and If the threshold is exceeded, select the updated cross reference value, If the threshold value is not close to the threshold value 732 and is near the zero crossing, a control signal S7 for selecting the zero value as the reference value is output to the cross detection unit 70. This control will be described with reference to FIG.
- the circles are sampling data points
- PE1 to PE4 are phase error data points
- the area surrounded by broken lines in the upper and lower areas is the area where the zeta cross detection method is used.
- the area where the zero-cross detection method is used and the area where the feedback detection method is used are separated by a threshold voltage 732. Since the phase error data points PE1 and PE2 have a phase error larger than the threshold 732, the phase error is detected by the feedback detection method, but the phase error is smaller than the threshold 732.
- At data points PE 3 and PE 4 switch to the zero-crossing detection method.
- the phase error exceeds the preset threshold value 732, the rising Z-falling cross reference value is updated and used as the reference data for the next cross detection. If less than 32, the cross reference value generator 72 outputs a zero, and the conventional zero-cross point detection method is performed, so that efficient phase error detection can be realized.
- phase error detection circuit according to a seventh embodiment.
- a case where switching of the cross detection method is performed based on an external signal will be described.
- sync marks (known codes) (specific patterns) are recorded at certain intervals.
- the state in which the sync interval can be read indicates that the frequency error has been reduced.
- the sync detection signal generated at the time of the detection is received as an external signal S 8 in FIG. 9 by the switching determination circuit 7 33 of the control signal generation unit 73, and immediately after the start of the reproduction operation. For example, when the sync detection signal is low, the phase error is detected using the feedback detection method.On the other hand, when the sync is read and the sync detection signal becomes HI, switch to the zero-cross detection method. Thus, the control signal S7 is output.
- the magnitude of the frequency error is determined by using the sync detection signal generated by detecting the sync recorded at regular intervals as the external signal S8, and if the sync detection signal is LOW, The rising / falling cross reference value is updated using the feedback method, the reference data for the next cross detection is used, and in the situation where the frequency error is small when the sync detection signal becomes HI, the conventional zero cross point detection method is used. By using it, it is possible to realize efficient phase error detection.
- phase error detection circuit according to an eighth embodiment.
- another modification in which switching of the mouth detection method is performed based on an external signal will be described.
- the playback signal may be in an abnormal state due to scratches or dirt.
- the abnormal signal detection signal generated when this abnormal reproduction signal is detected is input as the external signal S 8 in FIG. 9 to the switching determination circuit 73 3 of the control signal generation unit 73, and the abnormal signal detection signal is set to HI.
- the control signal S7 is output to the cross reference value generator 72 as an operation reset signal.
- the cross reference value generation unit 72 is detected when the abnormal signal detection signal is detected. Reset the output cross reference value to the specified value. Therefore, it is possible to suppress the variation of the phase error data caused by the abnormal signal, and it is possible to realize the high efficiency and the phase error detection.
- the configuration of the control signal generation unit 73 a configuration having both the configurations of the sixth and sixth embodiments and the configurations of the seventh and eighth embodiments may be adopted. Of course.
- FIG. 12 shows the configuration of the phase error detection circuit of the present embodiment.
- the phase error data which is the next zero cross point is detected using the phase error data detected in the previous process as a reference value, but in the present embodiment, the phase error data detected in the previous process is detected.
- a threshold value is provided for the value of the phase error data to be used as the reference value to suppress jitter and the like.
- a threshold value generation unit 711 is further arranged in addition to the phase error detection circuit 7100 shown in FIG.
- the configuration of the cross reference value generator 712 has been changed in accordance with the arrangement of the threshold generator 711.
- FIG. 13 shows the configuration of the threshold value generation section 7 11.
- the threshold generator 711 shown in the figure shows a configuration of only a part for generating a rising threshold.
- the configuration of the portion for generating the falling threshold is the same, and therefore will not be described.
- the threshold generator 7 11 1 in the figure 7 2 3, 7 2 7 and 7 2 8 are selectors, 7 2 4 is a D flip-flop, 7 2 5 is a decreasing circuit, and 7 2 6 is a threshold amount switching signal generation
- the section (switching signal generation section) and 729 are logic circuits.
- the setting threshold value S 11 input from the outside is selected by the selector 723 and held in the D flip-flop 724.
- the value of the setting threshold S 1 1 is changed to another value When changed, the enable signal SI 2 changes from “0” value to “1”, the changed setting threshold S 11 is selected by the selector 7 23, and is held in the D flip-flop 7 2 4 You.
- the gradual decrease circuit 725 gradually reduces the value of the threshold value S11 held in the D flip-flop 724 by an arbitrary setting.
- the threshold amount switching signal generator 726 receives the external signal S8.
- the external signal S8 is generated and output when the number of times of the zero cross of the reproduction data is less than a predetermined value during a predetermined period.
- the threshold value switching signal generation section 726 Upon receiving the external signal S8, the threshold value switching signal generation section 726 generates a switching signal and outputs this switching signal to a selector (selection circuit) 727.
- the selector 727 receives the switching signal and selects the threshold value held in the D flip-flop 724, and when not receiving the switching signal, selects the threshold value from the gradual decrease circuit 725. .
- FIG. 14 shows the configuration of the cross reference value generator 712 shown in FIG.
- 7 13 is a gain adjustment circuit for rising cross data
- 7 14 is a gain adjustment circuit for falling cross data
- 7 15 and 7 16 are subtractors
- 7 17 and 7 18 are selectors.
- the cross reference value generation unit 71 2 includes the rising and falling phase error data S 3 and S 4 of the phase error calculation unit 70 3, the threshold value S 9 from the threshold value generation unit 71 1, and the In response to the control signal S7 from the control signal generator 7 13, the controller outputs a rising reference value S5 and a falling reference value S6.
- the subtracter 715 subtracts the rising threshold S 9 a from the threshold generator 7 11 1 from the rising phase error data S 3 gain-adjusted by the gain adjusting circuit 7 13, and the subtraction result Is output to the selector 7 17.
- the selector 7 17 When the sign data from the subtractor 715 is positive (“1”), the rising threshold S 9 a is selected, and when the sign data is negative (“0”), the rising phase error data is selected.
- the selector 717 compares the rising phase error data with the absolute value of the rising threshold S9a, selects the smaller value, and outputs the smaller value as the rising cross reference value.
- the other selector 719 receives the control signal S7 from the control signal generator 713, and selects a rising cross reference value of zero when the value of the control signal is “1”, while the value of the control signal is When the value is "0", the rising cross reference value from the selector 717 is selected, and the selected cross reference value is output to the rising cross detection unit 701 in FIG. 12 as the rising cross reference value S5.
- phase error detection circuit of the present embodiment a reproduced signal of 3T + 3T (T is a channel period) and a sampling point are shown, PE1, PE2, PE3, and PE4 are phase error data, Lr1 is a rising cross reference value, L ⁇ 1 and L f2 indicate a falling cross reference value, L rth indicates a rising threshold, and L fth indicates a falling threshold.
- T is a channel period
- PE1, PE2, PE3, and PE4 are phase error data
- Lr1 is a rising cross reference value
- L ⁇ 1 and L f2 indicate a falling cross reference value
- L rth indicates a rising threshold
- L fth indicates a falling threshold.
- the rising edge phase error data PE 1 detected first has an absolute value smaller than the rising threshold value L rth, so the selector 717 of the cross reference value generation unit 71 2 rises.
- the peak phase error data PE1 is selected, and the amplitude value of the rising phase error data PE1 becomes the rising cross reference value Lr1.
- the average value of the phase error data PE3 and the preceding phase error data (indicated by the symbol XI in the figure) is negative below the rising cross reference value Lr1, and
- the average value of this rising phase error data PE 3 and the subsequent phase error data (the symbol X in the figure) 2) is positive beyond the rising cross reference value L r1, the phase error data PE 3 is detected as rising phase error data. Since the amplitude value of the rising phase error data PE3 is larger than the absolute value of the preset rising threshold L rth, the rising threshold L rth becomes the next rising cross reference value.
- the falling phase error data PE 2 since the falling phase error data PE 2 detected first has an absolute value smaller than the falling threshold L ⁇ th, the falling phase error data PE 2 Becomes the falling cross reference value L f 1.
- the absolute value of the average value (indicated by the symbol X3 in the figure) of the phase error data PE4 and the preceding phase error data is the falling cross reference.
- the average value of the falling phase error data PE 4 and the subsequent phase error data is less than the absolute value of the value L f 1 and is negative. Since it is more than 1 and positive, this phase error data PE 4 is detected as falling phase error data.
- the threshold is set when the phase error data detected one process before is used as the reference value for the detection of the next phase error data, so that feedback control due to jitter, disturbance, or the like is performed.
- the divergence can be suppressed, and the capture range of the phase comparator can be expanded.
- phase error detection circuit according to the tenth embodiment of the present invention will be described.
- the configuration of the cross reference value generator 712 of the ninth embodiment is partially modified. That is, in the cross reference value generation unit 712a of FIG. 16, an absolute value average calculation circuit 721 and a sign inversion circuit 722 are added.
- the absolute value average calculation circuit 721 calculates and outputs the average value of the absolute value of the rising cross reference value selected by the selector 717 and the absolute value of the rising cross reference value selected by the selector 718.
- the average cross reference value from the absolute value average calculation circuit 721 is output to the selector 719 as it is, and is output to the selector 720 after being inverted in sign by the sign inversion circuit 722.
- the cross reference value generator 712a shown in FIG. 16 employs a common reference value having the same absolute value as the cross reference value of the rising phase error data and the falling phase error data.
- the operation of the phase error detection circuit of the present embodiment will be described with reference to FIG. In the figure, a reproduced signal of 3T + 3T (T is a channel cycle) and a sampling point are shown.
- the rising phase error data PE 1 detected first has an absolute value smaller than the rising threshold value L rth
- the amplitude value of the rising phase error data PE 1 is equal to the rising cross reference value L r1. Become.
- the absolute value of the falling phase error data PE 2 detected first is smaller than the falling threshold value L fth, so that the amplitude value of the falling phase error data PE 2 becomes the falling cross reference value L f 1 It becomes.
- the average value of the absolute values of the rising and falling cross reference values Lr1 and Lf1 ((Lr1 + Lf1) / 2) S, the next rising phase error data PE3
- the inverted reference value of the sign of the average value of its absolute value minus one ((Lr1 + Lf1) / 2) becomes the detection reference value of the next falling phase error data PE4.
- the absolute values of the amplitude values of both the rising and falling phase error data PE 3 and PE 4 were compared with the absolute values of both the rising and falling threshold values L rth and L fth. Based on the results, the following cross reference values for rising and falling Lr2, Lf Generate 2. Therefore, also in the present embodiment, as in the ninth embodiment, it is possible to suppress the divergence of feedback control due to jitter, disturbance, and the like, and it is possible to expand the cap challenge of the phase error detection circuit.
- a phase error detection circuit according to the eleventh embodiment of the present invention will be described.
- a part of the configuration of the mouth reference value generating unit 712 of the ninth embodiment is further modified. That is, in the cross reference value generation unit 712b of the present embodiment shown in FIG. 18, the gain adjustment circuit for generating the falling reference value in the cross reference value generation unit 712 shown in FIG. 7 14, the subtractor 7 16 and the selector 7 18 are omitted, and the value obtained by inverting the sign of the rising cross reference value from the rising reference value generating selector 7 17 by the sign inverting circuit 7 2 2 falls.
- the configuration is such that it is input to the selector 720 as a cross reference value.
- the following rising and falling cross reference values Lr2 and Lf2 are generated.
- the gain adjustment circuit 7 13, the subtractor 7 15, and the selector 7 17 for rising reference value generation are provided as the cross reference value generation section 7 12 b.
- the cross reference value generation section 7 12 in FIG. 12 it is needless to say that only the gain adjustment circuit 7 14, the subtractor 7 16 and the selector 7 18 for generating the falling reference value may be provided. .
- a falling cross reference value is generated, and a value obtained by inverting the sign of the falling cross reference value is used as the rising cross reference value.
- FIG. 20 shows how both the rising and falling cross reference values are generated in this case.
- the time when the control signal generating section 713 shown in FIG. 12 generates the control signal is specified. That is, as shown in FIG. 12, the control signal generation unit 713 receives the phase error data PED from the phase error calculation unit 703, monitors the phase error data PED, and monitors the phase error data PED. As the amount gets smaller, as shown in Figure 21.
- the control signal S5 for switching to the detection method is output to the cross reference value generator 712 shown in FIG. Therefore, in the present embodiment, as shown in FIG.
- the reproduced data enters the steady state determination area after the cross data point PE2, and thereafter, a total of predetermined (five) cross data points PE2 to PE2
- the control signal generation section 713 generates the control signal S7 at the time when the counter 6 has counted 6
- the cross reference value generation section 712 sets the two selectors 719 and 720 to the zero value as shown in FIG. Since the cross reference value is selected, it is possible to switch from the feedback detection method to the zero cross detection method. Therefore, in the present embodiment, during the period in which the phase error amount is large, both the rising and falling cross reference values are updated and used as the reference value for the next cross data detection. When approaching, it is possible to switch to the zero-crossing data detection method and realize efficient phase error detection.
- phase error detection circuit according to a thirteenth embodiment of the present invention will be described.
- the time when the control signal generator 713 shown in FIG. 12 generates the control signal is specified at a different time from the above. That is, as shown in FIG. 12, the control signal generator 713 receives the phase error data PED from the phase error calculator 703, monitors the phase error data PED, and calculates the amount of the phase error. Compare with a predetermined threshold. As shown in FIG. 22, this threshold is a phase error amount that is set in advance as being within the applicable range of the zero-crossing detection method. As a result of comparing the input phase error data PED with the predetermined threshold value, the control signal generation unit 713 determines that the phase error data PED is less than the predetermined threshold value and is close to zero crossing.
- a control signal having a value of “1” is output to the cross reference generation unit 712 shown in FIG. Therefore, in the present embodiment, as shown in FIG. 22, the cross data points PE 1 and PE 2 have a large amount of phase error, so that the cross data is detected by the feedback detection method.
- the phase error amount becomes smaller than the predetermined threshold value as in PE3 and PE4, the mode is switched to the zero-cross detection method.
- phase error detection circuit according to a fourteenth embodiment of the present invention will be described.
- the present embodiment similar to the seventh embodiment, when an external signal S8 input to the control signal generation unit 713 is detected when a sync mark recorded on an optical disc such as a DVD at regular intervals is detected.
- the sync detection signal is used.
- the control signal generation section 7 13 When receiving the sync detection signal, that is, in a situation where the frequency error of the reproduction data is reduced, the control signal generation section 7 13 generates the control signal S 7 having a value of “1” to generate the cross reference value. Output to section 7 1 2.
- the cross reference value generator 712 As shown in FIG. 14, since the selectors 719 and 720 select a zero-value cross reference value, the cross detection method is changed from the feedback method to the zero cross reference. Switch to data detection method.
- phase error detection circuit according to the fifteenth embodiment will be described.
- the external signal S8 input to the control signal generation unit 7 13 an abnormal state in which the reproduction signal is in an abnormal state due to scratches, dirt, etc. of the optical disc is used.
- An abnormal signal detection signal that detects a reproduction signal is employed.
- control signal generation section 7 13 When receiving the abnormal signal detection signal, the control signal generation section 7 13 generates a control signal S 7 having a value of 1 J, and resets the cross reference value to a zero value by the cross reference value generation section 7 12. I do.
- control signal generation section 7 13 is the same as the configuration in the first and second embodiments and the configuration having both the configuration in the first and fourth embodiments. Of course, they can be adopted. INDUSTRIAL APPLICABILITY As described above, according to the present invention, even when the reproduction data and the sampling clock are not synchronized, it is possible to accurately detect the phase error and expand the cap challenge. Therefore, it is useful as a phase error detection circuit and a synchronous clock extraction circuit including the same.
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Abstract
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US10/533,434 US7423948B2 (en) | 2003-09-09 | 2004-06-11 | Phase error detecting circuit and synchronization clock extraction circuit |
JP2005513814A JP3889027B2 (ja) | 2003-09-09 | 2004-06-11 | 位相誤差検出回路及び同期クロック抽出回路 |
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WO2009069246A1 (ja) * | 2007-11-26 | 2009-06-04 | Panasonic Corporation | 位相比較器、pll回路、情報再生処理装置、光ディスク再生装置及び磁気ディスク再生装置 |
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US20080231332A1 (en) * | 2004-03-23 | 2008-09-25 | Matsushita Electric Industrial Co., Ltd. | Clock Signal Generation Device, Semiconductor Integrated Circuit, and Data Reproduction Method |
US7447279B2 (en) * | 2005-01-31 | 2008-11-04 | Freescale Semiconductor, Inc. | Method and system for indicating zero-crossings of a signal in the presence of noise |
KR100749752B1 (ko) * | 2006-08-01 | 2007-08-17 | 삼성전자주식회사 | 디스크 구동 회로의 리드 회로 및 리드 회로의 신호처리방법 |
US7945009B1 (en) | 2006-08-22 | 2011-05-17 | Marvell International Ltd. | Jitter measurement |
KR100989458B1 (ko) * | 2008-05-13 | 2010-10-22 | 주식회사 하이닉스반도체 | 반도체 장치의 카운터 |
KR101493777B1 (ko) * | 2008-06-11 | 2015-02-17 | 삼성전자주식회사 | 주파수 검출기 및 이를 포함하는 위상 동기 루프 |
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WO2009031260A1 (ja) * | 2007-09-03 | 2009-03-12 | Panasonic Corporation | 位相比較器、及びこれを用いたクロック生成回路、映像表示装置及び再生信号処理装置 |
JP4944943B2 (ja) * | 2007-09-03 | 2012-06-06 | パナソニック株式会社 | 位相比較器、及びこれを用いたクロック生成回路、映像表示装置及び再生信号処理装置 |
WO2009069246A1 (ja) * | 2007-11-26 | 2009-06-04 | Panasonic Corporation | 位相比較器、pll回路、情報再生処理装置、光ディスク再生装置及び磁気ディスク再生装置 |
JPWO2009069246A1 (ja) * | 2007-11-26 | 2011-04-07 | パナソニック株式会社 | 位相比較器、pll回路、情報再生処理装置、光ディスク再生装置及び磁気ディスク再生装置 |
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JP3889027B2 (ja) | 2007-03-07 |
JPWO2005027122A1 (ja) | 2006-11-24 |
US7423948B2 (en) | 2008-09-09 |
US20060044990A1 (en) | 2006-03-02 |
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