US20080013429A1 - ADIP demodulation method and apparatus - Google Patents

ADIP demodulation method and apparatus Download PDF

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US20080013429A1
US20080013429A1 US11/902,310 US90231007A US2008013429A1 US 20080013429 A1 US20080013429 A1 US 20080013429A1 US 90231007 A US90231007 A US 90231007A US 2008013429 A1 US2008013429 A1 US 2008013429A1
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adip
wobble
signal
pulse
channel bit
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Hao-Cheng Chen
Wen-Yi Wu
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    • 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

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  • the invention relates to an ADIP (Address In Pre-groove) demodulation method and apparatus, and more particularly to an ADIP demodulation method and apparatus, which generates a difference signal between the wobble signal and the reference wobble signal and outputs the channel bit signal according to the difference signal.
  • ADIP Address In Pre-groove
  • each data block includes 93 wobble cycles, wherein 8 wobble cycles are modulated with ADIP information and other 85 wobble cycles are positive wobble signal.
  • 8 wobble cycles of phase modulation wobble signal with the ADIP information only represent three states, i.e., the sync data of FIG. 1A , the data 0 of FIG. 1B , and the data 1 of FIG. 1C .
  • the optical disk driver retrieves the analog wobble signal from the disk, the analog wobble signal has to be digitized and converted into the channel bit, which is then decoded into the ADIP information by an ADIP decoder.
  • the channel bit corresponding to the sync data is “11110000,” the channel bit corresponding to the data 0 is “10000011,” and the channel bit corresponding to the data 1 is “10001100.”
  • the ADIP decoder can generate the ADIP information only according to the channel bits.
  • the ADIP decoder may have errors during the decoding process. Consequently, the DVD+R/RW optical disk driver must have an ADIP demodulation method and apparatus with high noise tolerance.
  • the wobble signal is assumed to be a cosine signal with a phase A.
  • the multiplied signal is transferred to an integrator and the value of B is adjusted to make the value of the multiplied signal to be 0.
  • the above-mentioned sine wave is the to-be-generated wobble sync signal (wobsync).
  • the signal is transferred for integration.
  • an object of the invention is to provide an ADIP demodulation method and apparatus with good noise immunity for ADIP signal without using 8-bit analog-to-digital converters and complicated operations of the trigonometric functions.
  • the ADIP demodulation apparatus of the invention includes a slicing unit for receiving the wobble signal and generating a wobble pulse, a phase locked loop for generating a reference wobble signal with the same frequency and phase as the wobble pulse according to the wobble pulse and a reference clock with frequency higher than the wobble pulse, a channel bit generator for generating channel bits according to the reference wobble signal and the wobble pulse, and a ADIP decoder for generating ADIP information according to the channel bits.
  • the channel bit generator generates a difference signal between the wobble pulse and the reference wobble signal, and outputs the channel bit signal according to the difference signal.
  • FIG. 1A shows the sync data of the ADIP modulation.
  • FIG. 1B shows the data 0 of the ADIP modulation.
  • FIG. 1C shows the data 1 of the ADIP modulation.
  • FIG. 2 shows a block diagram of an ADIP demodulation apparatus of the present invention.
  • FIG. 3 shows a block diagram of a channel bit generator.
  • FIGS. 4A-4H show a schematic illustration of the waveforms of some signals, wherein FIG. 4A represents a wobble signal, FIG. 4B represents a wobble pulse WOBPUS, FIG. 4C represents a reference wobble signal WOBREF, FIG. 4D represents a difference signal PHDIFF, FIG. 4E represents a reference clock WCK, FIG. 4F represents a positive edge pulse PCK, FIG. 4G represents a count value, and FIG. 4H represents a channel bit signal.
  • FIG. 5 shows a flow chart of an ADIP demodulation method of the present invention.
  • FIG. 2 shows a block diagram of an ADIP demodulation apparatus of the present invention.
  • the ADIP demodulation apparatus 20 includes a slicing unit 21 , a clock generator 22 , a phase locked loop (PLL) 23 , a channel bit generator 24 , and an ADIP decoder 25 .
  • PLL phase locked loop
  • the slicing unit 21 receives a wobble signal WOBS and slices the wobble signal WOBS into a binary signal with levels of 1 and 0 according to a slicing level.
  • the binary signal is defined as a wobble pulse WOBPUS.
  • the cycle length of the wobble pulse WOBPUS is 32 T, wherein T is the basic pulse length.
  • the clock generator 22 generates a reference clock WCK according to the wobble pulse WOBPUS.
  • the reference clock WCK is a reference signal with frequency higher than the wobble pulse WOBPUS, and the cycle length thereof is 2 T or 1 T, for example.
  • the phase locked loop 23 generates a reference wobble signal WOBREF with the same frequency and phase as the wobble pulse WOBPUS according to the reference clock WCK.
  • the cycle length of the reference wobble signal WOBREF is also 32 T.
  • the channel bit generator 24 generates the channel bit signal according to the wobble pulse WOBPUS, the reference wobble signal WOBREF, and the reference clock WCK.
  • the ADIP decoder 25 is employed to decode the channel bit signal into the ADIP bit signal.
  • FIG. 3 shows a block diagram of the channel bit generator.
  • the channel bit generator 24 includes a positive-edge pulse generator 241 , an XOR gate (bit comparator) 242 , a counter 243 , and a decision unit 244 .
  • the XOR gate 242 receives the wobble pulse WOBPUS and the reference wobble signal WOBREF and generates a difference signal PHDIFF between the wobble pulse WOBPUS and the reference wobble signal WOBREF.
  • the positive-edge pulse generator 241 receives the reference wobble signal WOBREF and the reference clock WCK and generates a positive edge pulse PCK at the positive edge of the reference wobble signal WOBREF.
  • the counter 243 counts the pulse number of the reference clock WCK during the high level of the difference signal PHDIFF in each cycle of the reference wobble signal WOBREF (or each cycle of the positive edge pulse PCK) and outputs a count value as a duty cycle.
  • the counter 243 clear the count value at the negative edge of the positive edge pulse PCK.
  • the decision unit 244 receives the count value of the counter 243 , compares the count value (duty cycle) with a threshold value at the negative edge of the positive edge pulse PCK, and then outputs the channel bit signal.
  • the decision unit 244 is a comparator for comparing the count value with a threshold value, and then outputting the channel bit signal at the negative edge of each positive edge pulse PCK.
  • the operation principle of the decision unit 244 will be described in the following. If the cycle length of the reference wobble signal WOBREF is 32 T and the cycle length of the reference clock WCK is 2 T, then there are 16 pulses of the reference clock WCK in each cycle of the reference wobble signal WOBREF. Therefore, if one phase of the wobble pulse WOBPUS is changed, that is, the phases between the wobble pulse WOBPUS and the reference wobble signal WOBREF are reverse, the difference signal PHDIFF is changed to H and the value of the counter 243 should be 16. However, since the wobble pulse WOBPUS will be influenced by the noise, the value of the counter 243 may be smaller than 16, but the difference is not too great.
  • the channel bit signal is free from being influenced by the noise. Then, the decision unit 244 can correctly generate the channel bit signal. That is, if the duty cycle of the difference signal is greater than a threshold, for example 50%, the channel bit signal is H, otherwise the channel bit signal is L.
  • a threshold for example 50%
  • FIGS. 4A-4H show the schematic illustration of the waveforms of some signals in the ADIP demodulation apparatus of the invention, wherein FIG. 4A shows the wobble signal, FIG. 4B shows the wobble pulse WOBPUS, FIG. 4C shows the reference wobble signal WOBREF, FIG. 4D shows the difference signal PHDIFF, FIG. 4E shows the reference clock WCK, FIG. 4F shows the positive edge pulse PCK, FIG. 4G shows the count value, and FIG. 4H shows the channel bit signal.
  • the slicing unit receives the wobble signal of FIG. 4A and generates the wobble pulse WOBPUS of FIG. 4B .
  • the reference clock generator 22 generates the reference clock WCK of FIG.
  • the phase locked loop 23 generates the reference wobble signal WOBREF of FIG. 4C according to the wobble pulse WOBPUS of FIG. 4B and the reference clock WCK of FIG. 4E .
  • the XOR gate 242 generates the difference signal PHDIFF of FIG. 4D according to the wobble pulse WOBPUS of FIG. 4B and the reference wobble signal WOBREF of FIG. 4C .
  • the positive-edge pulse generator 241 generates the positive edge pulse PCK of FIG. 4F according to the reference clock WCK of FIG. 4E and the reference wobble signal WOBREF of FIG. 4C .
  • the counter 243 outputs the count value CNT_VAL of FIG. 4G
  • the decision unit 244 generates the channel bit signal of FIG. 4H according to the count value CNT_VAL of FIG. 4G
  • FIG. 5 shows a flow chart of an ADIP demodulation method of the present invention.
  • the ADIP demodulation method of the invention includes the following steps.
  • Step S 502 generate a wobble pulse WOBPUS.
  • a wobble signal is sliced into a binary signal as the wobble pulse WOBPUS.
  • Step S 504 generate a reference wobble signal WOBREF.
  • a phase locked loop PLL is used to generate the reference wobble signal WOBREF with the same frequency and phase as the wobble pulse WOBPUS.
  • Step S 506 generate a difference signal PHDIFF.
  • the reference wobble signal WOBREF and the wobble pulse WOBPUS are XORed to generate the difference signal PHDIFF.
  • Step S 508 calculate the duty cycle of the difference signal PHDIFF.
  • a counter is used to count the high level width of the difference signal PHDIFF corresponding to each cycle of the wobble pulse WOBPUS using a reference clock with frequency higher than the wobble pulse WOBPUS and to output a count value as the duty cycle.
  • Step S 510 generate a channel bit signal.
  • the count value (duty cycle) is higher than a threshold value, the channel bit signal is H; otherwise the channel bit signal is L.
  • Step S 512 generate the ADIP information.
  • the ADIP information is the sync signal.
  • the channel bit signal sequence is 10000011 or its similar sequence
  • the ADIP information is 0.
  • the channel bit signal sequence is 10001100 or its similar sequence
  • the ADIP information is 1.
  • the ADIP demodulation apparatus of the invention can provide good noise immunity for ADIP signal.

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  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

An ADIP demodulation method and apparatus, which are used in an optical disk driver to generate the ADIP information according to a wobble signal. The apparatus includes a slicing unit for receiving the wobble signal and generating a wobble pulse, a phase locked loop for generating a reference wobble signal with the same frequency and phase as the wobble pulse and a reference clock with frequency higher than the wobble pulse, a channel bit generator for generating a channel bit signal according to the reference wobble signal and the wobble pulse, and a decoder for decoding to ADIP information according to the channel bit signal. The channel bit generator generates a difference signal between the wobble pulse and the reference wobble signal, and outputs the channel bit signal according to the difference signal.

Description

  • This application is Continuation of co-pending application Ser. No. 10/623,576 filed on Jul. 22, 2003 and for which priority is claimed under U.S.C. §120. This application claims priority to Application No. 091116530 filed in Taiwan, Republic of China on Jul. 24, 2002 under 35 U.S.C. §119, the entire content of both of which are hereby incorporated by reference.
    • BACKGROUND OF THE INVENTION
  • 1. Field of the invention
  • The invention relates to an ADIP (Address In Pre-groove) demodulation method and apparatus, and more particularly to an ADIP demodulation method and apparatus, which generates a difference signal between the wobble signal and the reference wobble signal and outputs the channel bit signal according to the difference signal.
  • 2. Description of the Related Art
  • In the DVD+R (Recordable Digital Versatile Disk) or DVD-+RW (Rewritable Digital Versatile Disk), the ADIP (Address In Pre-groove) records the address of each track zone so as to locate the to-be-recorded track zones according to the ADIP information during the recording process. FIGS. 1A-1C show the rules of the ADIP modulation according to the specification of DVD+R/RW, and the wobble signal after modulation is the phase-change signal. According to the specification of DVD+R/RW, each data block includes 93 wobble cycles, wherein 8 wobble cycles are modulated with ADIP information and other 85 wobble cycles are positive wobble signal.
  • As shown in FIGS. 1A-1C, 8 wobble cycles of phase modulation wobble signal with the ADIP information only represent three states, i.e., the sync data of FIG. 1A, the data 0 of FIG. 1B, and the data 1 of FIG. 1C. When the optical disk driver retrieves the analog wobble signal from the disk, the analog wobble signal has to be digitized and converted into the channel bit, which is then decoded into the ADIP information by an ADIP decoder. The channel bit corresponding to the sync data is “11110000,” the channel bit corresponding to the data 0 is “10000011,” and the channel bit corresponding to the data 1 is “10001100.” Thus, the ADIP decoder can generate the ADIP information only according to the channel bits. However, since noises may influence the channel bits, the ADIP decoder may have errors during the decoding process. Consequently, the DVD+R/RW optical disk driver must have an ADIP demodulation method and apparatus with high noise tolerance.
  • In the conventional ADIP demodulation method, the wobble signal is assumed to be a cosine signal with a phase A. The wobble signal is first digitized and then multiplied by a sine wave with a phase of B, that is, the multiplied signal equals:
    CosA*SinB=½(sin(A+B)−sin(A−B)).
  • Next, the multiplied signal is transferred to an integrator and the value of B is adjusted to make the value of the multiplied signal to be 0. When A=B (i.e., the phases are the same), the value equals to 0. At this time, the above-mentioned sine wave is the to-be-generated wobble sync signal (wobsync).
  • The original signal CosA is multiplied by a cosine signal with a phase B of the wobble sync signal, and we may obtain:
    CosA*CosB=½(cos(A+B)+cos(A−B)).
  • Similarly, the signal is transferred for integration. When A=B, the value equals to +1, and when the phases are opposite, the value equals to −1, thereby the ADIP signal being decoded according to the changes.
  • However, the method mentioned above needs to use 8-bit analog-to-digital converter (ADC) to convert the wobble signal into digital data, and complicated operations of trigonometric functions has to be performed accordingly. Thus, the design is complicated and the cost is higher.
    • SUMMARY OF THE INVENTION
  • In view of the above-mentioned problems, an object of the invention is to provide an ADIP demodulation method and apparatus with good noise immunity for ADIP signal without using 8-bit analog-to-digital converters and complicated operations of the trigonometric functions.
  • To achieve the above-mentioned object, the ADIP demodulation apparatus of the invention includes a slicing unit for receiving the wobble signal and generating a wobble pulse, a phase locked loop for generating a reference wobble signal with the same frequency and phase as the wobble pulse according to the wobble pulse and a reference clock with frequency higher than the wobble pulse, a channel bit generator for generating channel bits according to the reference wobble signal and the wobble pulse, and a ADIP decoder for generating ADIP information according to the channel bits.
  • The channel bit generator generates a difference signal between the wobble pulse and the reference wobble signal, and outputs the channel bit signal according to the difference signal.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1A shows the sync data of the ADIP modulation.
  • FIG. 1B shows the data 0 of the ADIP modulation.
  • FIG. 1C shows the data 1 of the ADIP modulation.
  • FIG. 2 shows a block diagram of an ADIP demodulation apparatus of the present invention.
  • FIG. 3 shows a block diagram of a channel bit generator.
  • FIGS. 4A-4H show a schematic illustration of the waveforms of some signals, wherein FIG. 4A represents a wobble signal, FIG. 4B represents a wobble pulse WOBPUS, FIG. 4C represents a reference wobble signal WOBREF, FIG. 4D represents a difference signal PHDIFF, FIG. 4E represents a reference clock WCK, FIG. 4F represents a positive edge pulse PCK, FIG. 4G represents a count value, and FIG. 4H represents a channel bit signal.
  • FIG. 5 shows a flow chart of an ADIP demodulation method of the present invention.
    • DETAILED DESCRIPTION OF THE INVENTION
  • The ADIP demodulation method and apparatus of the invention will be described with reference to the accompanying drawings.
  • FIG. 2 shows a block diagram of an ADIP demodulation apparatus of the present invention. Referring to FIG. 2, the ADIP demodulation apparatus 20 includes a slicing unit 21, a clock generator 22, a phase locked loop (PLL) 23, a channel bit generator 24, and an ADIP decoder 25.
  • The slicing unit 21 receives a wobble signal WOBS and slices the wobble signal WOBS into a binary signal with levels of 1 and 0 according to a slicing level. The binary signal is defined as a wobble pulse WOBPUS. The cycle length of the wobble pulse WOBPUS is 32 T, wherein T is the basic pulse length. The clock generator 22 generates a reference clock WCK according to the wobble pulse WOBPUS. The reference clock WCK is a reference signal with frequency higher than the wobble pulse WOBPUS, and the cycle length thereof is 2 T or 1 T, for example. The phase locked loop 23 generates a reference wobble signal WOBREF with the same frequency and phase as the wobble pulse WOBPUS according to the reference clock WCK. The cycle length of the reference wobble signal WOBREF is also 32 T. The channel bit generator 24 generates the channel bit signal according to the wobble pulse WOBPUS, the reference wobble signal WOBREF, and the reference clock WCK. Finally, the ADIP decoder 25 is employed to decode the channel bit signal into the ADIP bit signal.
  • FIG. 3 shows a block diagram of the channel bit generator. Referring to FIG. 3, the channel bit generator 24 includes a positive-edge pulse generator 241, an XOR gate (bit comparator) 242, a counter 243, and a decision unit 244. The XOR gate 242 receives the wobble pulse WOBPUS and the reference wobble signal WOBREF and generates a difference signal PHDIFF between the wobble pulse WOBPUS and the reference wobble signal WOBREF. The positive-edge pulse generator 241 receives the reference wobble signal WOBREF and the reference clock WCK and generates a positive edge pulse PCK at the positive edge of the reference wobble signal WOBREF. The counter 243 counts the pulse number of the reference clock WCK during the high level of the difference signal PHDIFF in each cycle of the reference wobble signal WOBREF (or each cycle of the positive edge pulse PCK) and outputs a count value as a duty cycle. The counter 243 clear the count value at the negative edge of the positive edge pulse PCK. The decision unit 244 receives the count value of the counter 243, compares the count value (duty cycle) with a threshold value at the negative edge of the positive edge pulse PCK, and then outputs the channel bit signal. The decision unit 244 is a comparator for comparing the count value with a threshold value, and then outputting the channel bit signal at the negative edge of each positive edge pulse PCK.
  • The operation principle of the decision unit 244 will be described in the following. If the cycle length of the reference wobble signal WOBREF is 32 T and the cycle length of the reference clock WCK is 2 T, then there are 16 pulses of the reference clock WCK in each cycle of the reference wobble signal WOBREF. Therefore, if one phase of the wobble pulse WOBPUS is changed, that is, the phases between the wobble pulse WOBPUS and the reference wobble signal WOBREF are reverse, the difference signal PHDIFF is changed to H and the value of the counter 243 should be 16. However, since the wobble pulse WOBPUS will be influenced by the noise, the value of the counter 243 may be smaller than 16, but the difference is not too great. Consequently, as long as the threshold value of the decision unit 244 is properly set (for example, the threshold value is set to 8 in this embodiment), the channel bit signal is free from being influenced by the noise. Then, the decision unit 244 can correctly generate the channel bit signal. That is, if the duty cycle of the difference signal is greater than a threshold, for example 50%, the channel bit signal is H, otherwise the channel bit signal is L.
  • FIGS. 4A-4H show the schematic illustration of the waveforms of some signals in the ADIP demodulation apparatus of the invention, wherein FIG. 4A shows the wobble signal, FIG. 4B shows the wobble pulse WOBPUS, FIG. 4C shows the reference wobble signal WOBREF, FIG. 4D shows the difference signal PHDIFF, FIG. 4E shows the reference clock WCK, FIG. 4F shows the positive edge pulse PCK, FIG. 4G shows the count value, and FIG. 4H shows the channel bit signal. As shown in the FIGS. 4A-4H, the slicing unit receives the wobble signal of FIG. 4A and generates the wobble pulse WOBPUS of FIG. 4B. The reference clock generator 22 generates the reference clock WCK of FIG. 4E according to the wobble pulse WOBPUS of FIG. 4A. The phase locked loop 23 generates the reference wobble signal WOBREF of FIG. 4C according to the wobble pulse WOBPUS of FIG. 4B and the reference clock WCK of FIG. 4E. The XOR gate 242 generates the difference signal PHDIFF of FIG. 4D according to the wobble pulse WOBPUS of FIG. 4B and the reference wobble signal WOBREF of FIG. 4C. The positive-edge pulse generator 241 generates the positive edge pulse PCK of FIG. 4F according to the reference clock WCK of FIG. 4E and the reference wobble signal WOBREF of FIG. 4C. The counter 243 outputs the count value CNT_VAL of FIG. 4G Finally, the decision unit 244 generates the channel bit signal of FIG. 4H according to the count value CNT_VAL of FIG. 4G
  • FIG. 5 shows a flow chart of an ADIP demodulation method of the present invention. Referring to FIG. 5, the ADIP demodulation method of the invention includes the following steps.
  • Step S502: generate a wobble pulse WOBPUS. A wobble signal is sliced into a binary signal as the wobble pulse WOBPUS.
  • Step S504: generate a reference wobble signal WOBREF. A phase locked loop PLL is used to generate the reference wobble signal WOBREF with the same frequency and phase as the wobble pulse WOBPUS.
  • Step S506: generate a difference signal PHDIFF. The reference wobble signal WOBREF and the wobble pulse WOBPUS are XORed to generate the difference signal PHDIFF.
  • Step S508: calculate the duty cycle of the difference signal PHDIFF. A counter is used to count the high level width of the difference signal PHDIFF corresponding to each cycle of the wobble pulse WOBPUS using a reference clock with frequency higher than the wobble pulse WOBPUS and to output a count value as the duty cycle.
  • Step S510: generate a channel bit signal. When the count value (duty cycle) is higher than a threshold value, the channel bit signal is H; otherwise the channel bit signal is L.
  • Step S512: generate the ADIP information. When the channel bit signal sequence is 1110000 or its similar sequence, the ADIP information is the sync signal. When the channel bit signal sequence is 10000011 or its similar sequence, the ADIP information is 0. When the channel bit signal sequence is 10001100 or its similar sequence, the ADIP information is 1.
  • Since the invention uses a counter to calculate the duty cycle of the difference signal PHDIFF and output a count value (duty cycle), and then uses a comparator to compare the count value with a threshold value so as to generate a channel bit signal, the ADIP demodulation apparatus of the invention can provide good noise immunity for ADIP signal.
  • While certain exemplary embodiments have been described and shown in the accompanying drawings, it is to be understood that such embodiments are merely illustrative of and not restrictive on the broad invention, and that this invention not be limited to the specific construction and arrangement shown and described, since various other modifications may occur to those ordinarily skilled in the art.

Claims (10)

1. An ADIP demodulation apparatus for providing ADIP information according to a wobble signal modulated with the ADIP information, the ADIP demodulation apparatus comprising:
a digitize unit for receiving the wobble signal and generating a wobble pulse;
a phase locked loop for generating a reference wobble signal according to the wobble pulse;
an ADIP channel bit determination unit for determining an ADIP channel bit according to the reference wobble signal and the wobble pulse; and
a decoder for decoding the ADIP channel bit to generate the ADIP information.
2. The ADIP demodulation apparatus according to claim 1, wherein the ADIP channel bit determination unit comprises:
a comparator for comparing the wobble pulse and the reference wobble signal and generating a difference signal;
a counter for counting the width of high level of the difference signal corresponding to a period of the reference wobble signal using a counting clock and outputting a count value; and
a decision unit for comparing the count value with a threshold value and then outputting the ADIP channel bit.
3. The ADIP demodulation apparatus according to claim 2, further comprising a reference clock generator for generating the counting clock according to the wobble pulse.
4. The ADIP demodulation apparatus according to claim 2, wherein the comparator is an XOR gate.
5. The ADIP demodulation apparatus according to claim 2, wherein the ADIP channel bit determination unit further comprises:
an edge generator for generating an edge signal according to the reference wobble signal;
wherein the counter cleans the count value according to the edge signal.
6. An ADIP demodulation method for providing ADIP information according to a wobble signal modulated with the ADIP information, the ADIP demodulation method comprising the steps of:
generating a wobble pulse by digitizing the wobble signal;
generating a reference wobble signal according to the wobble pulse;
determining an ADIP channel bit according to the reference wobble signal and the wobble pulse; and
decoding the ADIP channel bit to generate the ADIP information.
7. The ADIP demodulation method according to claim 6, wherein the step of determining an ADIP channel bit comprises:
generating a difference signal by comparing the wobble pulse with the reference wobble signal;
counting the width of high level of the difference signal corresponding to a period of the reference wobble signal using a counting clock and outputting a count value; and
comparing the count value with a threshold value and then outputting the ADIP channel bit.
8. The ADIP demodulation method according to claim 7, wherein the counting clock is generated according to the wobble pulse.
9. The ADIP demodulation method according to claim 7, wherein the step of generating the difference signal by comparing the wobble pulse with the reference wobble signal is performed by an XOR gate.
10. The ADIP demodulation method according to claim 7, wherein the step of determining an ADIP channel bit further comprises:
generating an edge signal according to the reference wobble signal; and
cleaning the count value according to the edge signal.
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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050028208A1 (en) * 1998-07-17 2005-02-03 United Video Properties, Inc. Interactive television program guide with remote access
US20050229213A1 (en) * 1998-07-14 2005-10-13 Ellis Michael D Systems and methods for multi-tuner recording
US20070157222A1 (en) * 2005-12-29 2007-07-05 United Video Properties, Inc. Systems and methods for managing content
US20070157247A1 (en) * 2005-12-29 2007-07-05 United Video Properties, Inc. Systems and methods for managing content
US20070157223A1 (en) * 2005-12-29 2007-07-05 United Video Properties, Inc. Systems and methods for managing content
US20080184322A1 (en) * 1996-09-03 2008-07-31 Todd Blake Schedule system with enhanced recording capability
US20080189737A1 (en) * 1998-07-17 2008-08-07 Ellis Michael D Interactive television program guide system having multiple devices within a household
US20090313658A1 (en) * 2008-06-13 2009-12-17 United Video Properties, Inc. Systems and methods for displaying media content and media guidance information
US20100310238A1 (en) * 1996-10-16 2010-12-09 Gemstar Development Corp. Access to internet data through a television system
US8761584B2 (en) 1993-03-05 2014-06-24 Gemstar Development Corporation System and method for searching a database of television schedule information
US8806533B1 (en) 2004-10-08 2014-08-12 United Video Properties, Inc. System and method for using television information codes
US8892495B2 (en) 1991-12-23 2014-11-18 Blanding Hovenweep, Llc Adaptive pattern recognition based controller apparatus and method and human-interface therefore
US9071872B2 (en) 2003-01-30 2015-06-30 Rovi Guides, Inc. Interactive television systems with digital video recording and adjustable reminders
US9125169B2 (en) 2011-12-23 2015-09-01 Rovi Guides, Inc. Methods and systems for performing actions based on location-based rules
US9204193B2 (en) 2010-05-14 2015-12-01 Rovi Guides, Inc. Systems and methods for media detection and filtering using a parental control logging application
US9294799B2 (en) 2000-10-11 2016-03-22 Rovi Guides, Inc. Systems and methods for providing storage of data on servers in an on-demand media delivery system
US9307281B2 (en) 2007-03-22 2016-04-05 Rovi Guides, Inc. User defined rules for assigning destinations of content
US20160234167A1 (en) * 2011-07-26 2016-08-11 Light Cyber Ltd. Detecting anomaly action within a computer network
US9535563B2 (en) 1999-02-01 2017-01-03 Blanding Hovenweep, Llc Internet appliance system and method
US20180034713A1 (en) * 2013-01-11 2018-02-01 American Express Travel Related Services Company,Inc. Routing Service Call Messages
US10063934B2 (en) 2008-11-25 2018-08-28 Rovi Technologies Corporation Reducing unicast session duration with restart TV

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100829013B1 (en) * 2001-11-06 2008-05-15 엘지전자 주식회사 Method for wobble addressing on optical disc using an amplitude shift keying rule
KR100844847B1 (en) * 2001-12-06 2008-07-08 엘지전자 주식회사 Method for recording wobble signal and optical disc therof
US20060044959A1 (en) * 2004-08-13 2006-03-02 Mediatek Inc. Apparatus for detecting physical marks from wobble signal and method thereof
US7697380B2 (en) * 2006-06-05 2010-04-13 Mediatek Inc. Apparatus for detecting the wobble carrier frequency of an optical disk and method for same
US7693011B2 (en) * 2006-06-05 2010-04-06 Mediatek Inc. Wobble detection circuit and method for processing wobble signals
US20070280069A1 (en) * 2006-06-05 2007-12-06 Mediatek Inc. Method of gain control and controller thereof
US7693012B2 (en) * 2006-06-05 2010-04-06 Mediatek Inc. Apparatus for demodulating address in pre-groove symbols and apparatus for decoding pre-pit symbols

Citations (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4807204A (en) * 1986-07-07 1989-02-21 Brother Kogyo Kabushiki Kaisha Magneto-optical recording medium having pairs of mutually corresponding recording segments, and apparatus for recording information on the medium
US5195076A (en) * 1990-07-04 1993-03-16 Ricoh Company, Ltd. Defect detection circuit for optical pick up device
US5255260A (en) * 1989-07-28 1993-10-19 Matsushita Electric Industrial Co., Ltd. Optical recording apparatus employing stacked recording media with spiral grooves and floating optical heads
US5276674A (en) * 1990-03-15 1994-01-04 Matsushita Electric Industrial Co., Ltd. Optical recording medium having thin protective layer and two-dimensionally aligned code words and recording/reproducing apparatus employing the same
US5388090A (en) * 1991-07-09 1995-02-07 Hitachi, Ltd. Method, apparatus, and medium for recording information in data sections having number of bytes which increases with increase in circumference of tracks on medium
US5392263A (en) * 1990-01-31 1995-02-21 Sony Corporation Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens
US5495465A (en) * 1993-01-29 1996-02-27 Kabushiki Kaisha Kenwood Spindle control circuit of optical disk drive
US5508985A (en) * 1994-10-11 1996-04-16 Eastman Kodak Company Method for detecting and processing synchronization marks extracted from a prerecorded wobbled groove on a compact disk
US5592450A (en) * 1994-03-19 1997-01-07 Sony Corporation Method for reproducing compressed information data from a disk using a spatial frequency less than the track pitch
US5617392A (en) * 1993-06-28 1997-04-01 Samsung Electronics Co., Ltd. Method and apparatus for controlling rotation of an optical disk
US5910932A (en) * 1991-09-11 1999-06-08 Sony Corporation Optical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical disk
US5930228A (en) * 1996-07-26 1999-07-27 Hitachi, Ltd. Method and apparatus for recording and reproducing information using pseudo identification signal
US6028828A (en) * 1996-08-30 2000-02-22 Sharp Kabushiki Kaisha Disk type recording medium and disk recording and reproducing device
US6088307A (en) * 1997-03-19 2000-07-11 Hitachi, Ltd. Wobble signal detecting circuit, wobble abnormality detecting circuit, information processing apparatus using these circuits and method and recording medium used in the apparatus or method
US6097695A (en) * 1997-05-19 2000-08-01 Sony Corporation Optical disk with a groove for defining serial data modulated into a signal using modulation processing
US6137768A (en) * 1996-10-25 2000-10-24 Matsushita Electric Industrial Co., Ltd. Optical disc having oscillating lands and grooves
US6201778B1 (en) * 1997-05-14 2001-03-13 Sony Corporation Optical disk with a groove for defining serial data modulated into a signal using phase and frequency modulation
US6265919B1 (en) * 2000-01-28 2001-07-24 Lucent Technologies Inc. In phase alignment for PLL's
US20030002866A1 (en) * 1997-05-19 2003-01-02 Hideo Owa Apparatus for recording and/or reproducing data onto and/or from an optical disk and method thereof
US20030086348A1 (en) * 2001-10-03 2003-05-08 Matsushita Elec. Ind. Co., Ltd. Optical disk device
US20030198164A1 (en) * 2002-04-17 2003-10-23 Samsung Electronics Co., Ltd. Apparatus and method for detecting sector sync signal on an optical storage medium
US6657929B1 (en) * 1998-06-23 2003-12-02 Matsushita Electric Industrial Co., Ltd. Optical disk recording apparatus and method for recording data on optical disk

Patent Citations (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4807204A (en) * 1986-07-07 1989-02-21 Brother Kogyo Kabushiki Kaisha Magneto-optical recording medium having pairs of mutually corresponding recording segments, and apparatus for recording information on the medium
US5255260A (en) * 1989-07-28 1993-10-19 Matsushita Electric Industrial Co., Ltd. Optical recording apparatus employing stacked recording media with spiral grooves and floating optical heads
US5392263A (en) * 1990-01-31 1995-02-21 Sony Corporation Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens
US5276674A (en) * 1990-03-15 1994-01-04 Matsushita Electric Industrial Co., Ltd. Optical recording medium having thin protective layer and two-dimensionally aligned code words and recording/reproducing apparatus employing the same
US5195076A (en) * 1990-07-04 1993-03-16 Ricoh Company, Ltd. Defect detection circuit for optical pick up device
US5388090A (en) * 1991-07-09 1995-02-07 Hitachi, Ltd. Method, apparatus, and medium for recording information in data sections having number of bytes which increases with increase in circumference of tracks on medium
US5910932A (en) * 1991-09-11 1999-06-08 Sony Corporation Optical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical disk
US5495465A (en) * 1993-01-29 1996-02-27 Kabushiki Kaisha Kenwood Spindle control circuit of optical disk drive
US5617392A (en) * 1993-06-28 1997-04-01 Samsung Electronics Co., Ltd. Method and apparatus for controlling rotation of an optical disk
US5592450A (en) * 1994-03-19 1997-01-07 Sony Corporation Method for reproducing compressed information data from a disk using a spatial frequency less than the track pitch
US5508985A (en) * 1994-10-11 1996-04-16 Eastman Kodak Company Method for detecting and processing synchronization marks extracted from a prerecorded wobbled groove on a compact disk
US5930228A (en) * 1996-07-26 1999-07-27 Hitachi, Ltd. Method and apparatus for recording and reproducing information using pseudo identification signal
US6028828A (en) * 1996-08-30 2000-02-22 Sharp Kabushiki Kaisha Disk type recording medium and disk recording and reproducing device
US6137768A (en) * 1996-10-25 2000-10-24 Matsushita Electric Industrial Co., Ltd. Optical disc having oscillating lands and grooves
US6088307A (en) * 1997-03-19 2000-07-11 Hitachi, Ltd. Wobble signal detecting circuit, wobble abnormality detecting circuit, information processing apparatus using these circuits and method and recording medium used in the apparatus or method
US6201778B1 (en) * 1997-05-14 2001-03-13 Sony Corporation Optical disk with a groove for defining serial data modulated into a signal using phase and frequency modulation
US6097695A (en) * 1997-05-19 2000-08-01 Sony Corporation Optical disk with a groove for defining serial data modulated into a signal using modulation processing
US20030002866A1 (en) * 1997-05-19 2003-01-02 Hideo Owa Apparatus for recording and/or reproducing data onto and/or from an optical disk and method thereof
US6657929B1 (en) * 1998-06-23 2003-12-02 Matsushita Electric Industrial Co., Ltd. Optical disk recording apparatus and method for recording data on optical disk
US6265919B1 (en) * 2000-01-28 2001-07-24 Lucent Technologies Inc. In phase alignment for PLL's
US20030086348A1 (en) * 2001-10-03 2003-05-08 Matsushita Elec. Ind. Co., Ltd. Optical disk device
US20030198164A1 (en) * 2002-04-17 2003-10-23 Samsung Electronics Co., Ltd. Apparatus and method for detecting sector sync signal on an optical storage medium

Cited By (54)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8892495B2 (en) 1991-12-23 2014-11-18 Blanding Hovenweep, Llc Adaptive pattern recognition based controller apparatus and method and human-interface therefore
US8761584B2 (en) 1993-03-05 2014-06-24 Gemstar Development Corporation System and method for searching a database of television schedule information
US20080184322A1 (en) * 1996-09-03 2008-07-31 Todd Blake Schedule system with enhanced recording capability
US20100310238A1 (en) * 1996-10-16 2010-12-09 Gemstar Development Corp. Access to internet data through a television system
US9232254B2 (en) 1998-07-14 2016-01-05 Rovi Guides, Inc. Client-server based interactive television guide with server recording
US9226006B2 (en) 1998-07-14 2015-12-29 Rovi Guides, Inc. Client-server based interactive guide with server recording
US9154843B2 (en) 1998-07-14 2015-10-06 Rovi Guides, Inc. Client-server based interactive guide with server recording
US8528032B2 (en) 1998-07-14 2013-09-03 United Video Properties, Inc. Client-server based interactive television program guide system with remote server recording
US9118948B2 (en) 1998-07-14 2015-08-25 Rovi Guides, Inc. Client-server based interactive guide with server recording
US9055318B2 (en) 1998-07-14 2015-06-09 Rovi Guides, Inc. Client-server based interactive guide with server storage
US9055319B2 (en) 1998-07-14 2015-06-09 Rovi Guides, Inc. Interactive guide with recording
US9021538B2 (en) 1998-07-14 2015-04-28 Rovi Guides, Inc. Client-server based interactive guide with server recording
US10027998B2 (en) 1998-07-14 2018-07-17 Rovi Guides, Inc. Systems and methods for multi-tuner recording
US8776126B2 (en) 1998-07-14 2014-07-08 United Video Properties, Inc. Client-server based interactive television guide with server recording
US10075746B2 (en) 1998-07-14 2018-09-11 Rovi Guides, Inc. Client-server based interactive television guide with server recording
US20100310230A1 (en) * 1998-07-14 2010-12-09 United Video Properties, Inc. Client-server based interactive television program guide system with remote server recording
US20050229213A1 (en) * 1998-07-14 2005-10-13 Ellis Michael D Systems and methods for multi-tuner recording
US20100251303A1 (en) * 1998-07-17 2010-09-30 United Video Properties, Inc. Interactive television program guide system having multiple devices within a household
US20080189743A1 (en) * 1998-07-17 2008-08-07 Ellis Michael D Interactive television program guide with remote access
US8006263B2 (en) 1998-07-17 2011-08-23 United Video Properties, Inc. Interactive television program guide with remote access
US8578413B2 (en) 1998-07-17 2013-11-05 United Video Properties, Inc. Interactive television program guide with remote access
US8578423B2 (en) 1998-07-17 2013-11-05 United Video Properties, Inc. Interactive television program guide with remote access
US8584172B2 (en) 1998-07-17 2013-11-12 United Video Properties, Inc. Interactive television program guide with remote access
US20060031883A1 (en) * 1998-07-17 2006-02-09 United Video Properties, Inc. Interactive television program guide with remote access
US8755666B2 (en) 1998-07-17 2014-06-17 United Video Properties, Inc. Interactive television program guide with remote access
US7913278B2 (en) 1998-07-17 2011-03-22 United Video Properties, Inc. Interactive television program guide with remote access
US8768148B2 (en) 1998-07-17 2014-07-01 United Video Properties, Inc. Interactive television program guide with remote access
US20050028208A1 (en) * 1998-07-17 2005-02-03 United Video Properties, Inc. Interactive television program guide with remote access
US8046801B2 (en) 1998-07-17 2011-10-25 United Video Properties, Inc. Interactive television program guide with remote access
US9237369B2 (en) 1998-07-17 2016-01-12 Rovi Guides, Inc. Interactive television program guide system having multiple devices within a household
US20090044226A1 (en) * 1998-07-17 2009-02-12 Ellis Michael D Interactive Television Program Guide System Having Multiple Devices Within A Household
US20080189737A1 (en) * 1998-07-17 2008-08-07 Ellis Michael D Interactive television program guide system having multiple devices within a household
US9204184B2 (en) 1998-07-17 2015-12-01 Rovi Guides, Inc. Interactive television program guide with remote access
US9185449B2 (en) 1998-07-17 2015-11-10 Rovi Guides, Inc. Interactive television program guide system having multiple devices within a household
US9084006B2 (en) 1998-07-17 2015-07-14 Rovi Guides, Inc. Interactive television program guide system having multiple devices within a household
US20080189742A1 (en) * 1998-07-17 2008-08-07 Ellis Michael D Interactive television program guide with remote access
US9706245B2 (en) 1998-07-17 2017-07-11 Rovi Guides, Inc. Interactive television program guide system having multiple devices within a household
US20080010655A1 (en) * 1998-07-17 2008-01-10 Ellis Michael D Interactive television program guide with remote access
US9535563B2 (en) 1999-02-01 2017-01-03 Blanding Hovenweep, Llc Internet appliance system and method
US9294799B2 (en) 2000-10-11 2016-03-22 Rovi Guides, Inc. Systems and methods for providing storage of data on servers in an on-demand media delivery system
US9071872B2 (en) 2003-01-30 2015-06-30 Rovi Guides, Inc. Interactive television systems with digital video recording and adjustable reminders
US9369741B2 (en) 2003-01-30 2016-06-14 Rovi Guides, Inc. Interactive television systems with digital video recording and adjustable reminders
US8806533B1 (en) 2004-10-08 2014-08-12 United Video Properties, Inc. System and method for using television information codes
US20070157223A1 (en) * 2005-12-29 2007-07-05 United Video Properties, Inc. Systems and methods for managing content
US20070157247A1 (en) * 2005-12-29 2007-07-05 United Video Properties, Inc. Systems and methods for managing content
US20070157222A1 (en) * 2005-12-29 2007-07-05 United Video Properties, Inc. Systems and methods for managing content
US9307281B2 (en) 2007-03-22 2016-04-05 Rovi Guides, Inc. User defined rules for assigning destinations of content
US20090313658A1 (en) * 2008-06-13 2009-12-17 United Video Properties, Inc. Systems and methods for displaying media content and media guidance information
US8601526B2 (en) 2008-06-13 2013-12-03 United Video Properties, Inc. Systems and methods for displaying media content and media guidance information
US10063934B2 (en) 2008-11-25 2018-08-28 Rovi Technologies Corporation Reducing unicast session duration with restart TV
US9204193B2 (en) 2010-05-14 2015-12-01 Rovi Guides, Inc. Systems and methods for media detection and filtering using a parental control logging application
US20160234167A1 (en) * 2011-07-26 2016-08-11 Light Cyber Ltd. Detecting anomaly action within a computer network
US9125169B2 (en) 2011-12-23 2015-09-01 Rovi Guides, Inc. Methods and systems for performing actions based on location-based rules
US20180034713A1 (en) * 2013-01-11 2018-02-01 American Express Travel Related Services Company,Inc. Routing Service Call Messages

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