WO1999034609A1 - Circuit pll a deux boucles et circuit de demodulation de la chrominance utilisant ce dernier - Google Patents
Circuit pll a deux boucles et circuit de demodulation de la chrominance utilisant ce dernier Download PDFInfo
- Publication number
- WO1999034609A1 WO1999034609A1 PCT/JP1998/004915 JP9804915W WO9934609A1 WO 1999034609 A1 WO1999034609 A1 WO 1999034609A1 JP 9804915 W JP9804915 W JP 9804915W WO 9934609 A1 WO9934609 A1 WO 9934609A1
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/44—Colour synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/66—Circuits for processing colour signals for synchronous demodulators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/44—Colour synchronisation
- H04N9/45—Generation or recovery of colour sub-carriers
Definitions
- Double loop PLL circuit and color demodulation circuit using the PLL circuit Double loop PLL circuit and color demodulation circuit using the PLL circuit
- the present invention uses a PLL (Phase e-Locked Loop) circuit that creates a sampling clock for A / D (analog / digital) conversion that is phase-synchronized with a color burst, and uses the PLL circuit. It relates to a color demodulation circuit.
- the sampling clock created by the PLL circuit is used when digitally processing the input composite color signal or color signal.
- a PLL circuit that creates a sampling clock for A / D conversion that is phase-synchronized with the color burst detects a color subcarrier during the color burst period, and converts the clock that is phase-synchronized with the detected color subcarrier into a VCO (
- the clock was created by controlling the oscillation frequency of a voltage-controlled oscillator, and this clock was output to the A / D conversion circuit as a sampling clock.
- the phase of the sampling clock was finely adjusted by connecting multiple delay units with a fixed delay amount.
- the delay device with a fixed delay amount is connected in multiple stages to fine-tune the phase of the sampling clock.
- the delay device with a fixed delay amount is connected in multiple stages to fine-tune the phase of the sampling clock.
- an NTSC (National TV System Committee) type composite color signal (hereinafter simply referred to as an NTSC signal) E is represented by the following equation (1), where a color subcarrier having a frequency of F sc is converted into two color difference signals. It is created by quadrature two-phase amplitude modulation with I and Q, and frequency multiplexing with the luminance signal Y.
- F sc in the equation (1) represents (455/2) ⁇ F h (F sc is about 3.58 MHz), and F h represents the horizontal scanning frequency.
- phase relationship between the color signals in the NTSC signal is as shown in FIG.
- B—Y and R— ⁇ represent two color difference signals different from I and Q. Since the color difference signals I and Q and the color burst ⁇ have a phase relationship as shown in Fig. 2, the color difference signal I at the point where the phase difference from the phase reference point ( ⁇ - ⁇ axis) is 57 ° and 237 ° When the amplitude of the color difference signal Q is 0 and the amplitude of the color difference signal Q is 0, the amplitude of the color difference signal I is 0 and the amplitude of the color difference signal Q is 1 and 1 at the points where the phase differences are 147 ° and 327 °. (1, the maximum amplitude of Q is 1, 1 1).
- sampling is performed with a sampling clock having a frequency of 4 Fsc synchronized with the above-mentioned 57 ° of the color burst K, the color difference signals I and Q can be easily demodulated from the signal C, and interpolation calculation and the like can be performed. Demodulation can be performed with higher accuracy than estimated by.
- the present invention has been made in view of the above-described problems, and provides a PLL circuit capable of continuously changing the phase of a sampling clock for AZD conversion, and a color difference signal from a composite video signal using the PLL circuit.
- a color demodulation circuit that can easily and accurately demodulate The purpose is to: Disclosure of the invention
- a double loop PLL circuit includes a clamp circuit that clamps the DC level of an input composite color signal or color signal to a fixed level and outputs the same, and a sampling circuit that outputs the output signal of the clamp circuit.
- An AZD conversion circuit for sampling and outputting a digital signal; a reference color burst output circuit for comparing a color burst of the frequency F sc of the output signal of the clamp circuit with a slice level and outputting a rectangular wave reference color burst
- a PLL circuit that generates a signal with a frequency N ⁇ Fsc (N is an integer multiple of 4) synchronized with the reference color burst by oscillation frequency control and outputs the signal to the A / D converter as a sampling clock, and an AZD converter Based on the level difference between the circuit output signal and the preset phase reference value, the phase difference between the sampling clock and the reference color burst is calculated.
- the chrominance signal is a signal that is carrier-suppressed and amplitude-modulated by two chrominance subcarriers that are 90 degrees out of phase with two chrominance signals.
- the PLL circuit generates a signal of frequency N ⁇ F sc synchronized with the reference color burst output from the reference color burst output circuit, and outputs the signal to the A_ / D conversion circuit as a sampling clock.
- the phase of the reference color burst output from the reference color burst output circuit changes at the slice level, and this slice level changes according to the phase reference value in the phase detection circuit.
- the sampling clock output from the PLL circuit to the AD conversion circuit can be a signal having a frequency of N ⁇ Fsc synchronized with the phase of the color burst, and the phase can be continuously changed with the phase reference value.
- a sampling clock for AZD conversion suitable for color demodulation is output by adjusting the phase of the rising point of the reference color burst so that the phase difference from the phase reference point is 57 °. be able to.
- the reference color burst output circuit compares the output signal of the clamp circuit with the slice level and outputs a square wave signal.
- the level comparator outputs the signal of the color burst period of the output signal of the level comparator. Consists of a burst period sampling circuit for sampling I do. With this configuration, the configuration of the reference color burst output circuit can be simplified.
- the phase detection circuit is provided with an adder that adds the phase adjustment value to the phase reference value, and an addition value of the adder and an output signal of the AZD conversion circuit for a period set in advance according to the type of the input signal. And a slice level output circuit that outputs a signal corresponding to the level difference and outputs a corresponding slice level based on the output signal of the comparator.
- a phase reference circuit for switching a phase detection circuit between a preset NTSC and PAL phase reference signal with a switching signal and outputting the same, and a phase reference value output from the phase reference circuit.
- An adder that adds the phase adjustment value, and the adder of the adder and the output signal of the A / D conversion circuit for a period set in advance according to whether the input signal is an NTSC signal or a PAL signal. It comprises a comparator for comparing and outputting a signal corresponding to the level difference, and a slice level output circuit for outputting a corresponding slice level based on the output signal of the comparator.
- the slice level output circuit is composed of a filter that smoothes the output signal of the comparator and outputs the same, and a pulse width modulation circuit that outputs a corresponding pulse width modulation signal as a slice level based on the output signal of the filter. . With this configuration, the configuration of the slice level output circuit can be simplified.
- a color demodulation circuit using a double loop PLL circuit includes a clamp circuit that clamps and outputs a DC level of an input composite color signal or color signal to a fixed level, and an output signal of the clamp circuit.
- An AZD conversion circuit that samples the signal with a sampling clock and outputs a digital signal, and a reference color burst output that compares the color burst of the frequency F sc of the output signal of the clamp circuit with the slice level and outputs a square wave-shaped reference color burst A / D conversion by creating a signal of frequency N NFsc synchronized with the reference color burst by the circuit and oscillation frequency control
- the phase difference between the sampling clock and the reference color burst is detected based on the level difference between the output signal of the A / D converter circuit and the preset phase reference value.
- a phase detection circuit that outputs a corresponding slice level to a reference color burst output circuit, and a signal conversion circuit that converts an output signal of the AZD conversion circuit into
- the sampling clock output from the PLL circuit to the A / D conversion circuit can be converted into a signal with a frequency N.Fsc synchronized with the phase of the color burst, and the phase can be changed continuously with the phase reference value. . Therefore, by setting the phase reference value so that the phase of the sampling clock becomes a desired value, the signal C having the color difference signals (for example, one I, one Q, I, Q) in a predetermined order from the AZD conversion circuit is obtained. Can be output. Further, the signal conversion circuit can convert the signal C (for example, one I, —Q, I, Q) output from the AZD conversion circuit into individual color difference signals I and Q and output the signals.
- the reference color burst output circuit compares the output signal of the clamp circuit with the slice level to output a square wave signal, and extracts the signal of the color burst period from the output signal of the level comparator. It consists of a burst period sampling circuit. With this configuration, the configuration of the reference color burst output circuit can be simplified.
- the phase detection circuit uses an adder that adds a phase adjustment value for color tone adjustment to the phase reference value, and an addition value of the adder and AZD conversion for a preset period according to the type of input signal.
- a comparator for comparing the output signal of the circuit and outputting a signal corresponding to the level difference;
- a slice level output circuit for outputting a corresponding slice level based on the output signal of the comparator.
- phase reference value switching circuit that switches the phase detection circuit between a preset NTSC and PAL phase reference value with a switching signal and outputs the same, and a phase reference value output from the phase reference value switching circuit And an AZD conversion circuit for a preset period of time corresponding to whether the input signal is an NTSC signal or a PAL signal.
- a slice level output circuit that outputs a corresponding slice level based on the output signal of the comparator.
- the color tone can be adjusted, and it can be used for a composite color signal or color signal of the NTSC system and the PAL (Phase Alternate Line) system.
- the slice level output circuit includes a filter that smoothes the output signal of the comparator and outputs the same, and a pulse width modulation circuit that outputs a corresponding pulse width modulation signal as a slice level based on the output signal of the filter. .
- the configuration of the slice level output circuit can be simplified.
- FIG. 1 is an explanatory diagram showing a phase relationship between color difference signals in an NTSC signal.
- FIG. 3 is a block diagram showing an embodiment of a double loop PLL circuit according to the present invention.
- FIG. 4 is a block diagram showing the phase detection circuit in FIG.
- FIG. 5 is a waveform diagram of a reference color burst KK output from the reference color burst output circuit of FIG.
- FIG. 6 is a block diagram showing another example of the phase detection circuit in FIG.
- FIG. 7 is a block diagram showing an embodiment of a color demodulation circuit according to the present invention.
- FIG. 8 is a block diagram showing a signal conversion circuit in FIG.
- FIG. 9 is a waveform diagram of the first and second selection signals to the selection circuit in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 3 shows an embodiment of a double loop PLL circuit according to the present invention.
- reference numeral 10 denotes an input terminal for inputting an NTSC signal as an analog composite color signal
- 12 denotes a clamp.
- Circuit 14 is an AZD conversion circuit.
- the clamp circuit 12 clamps the DC level of the NTSC signal input to the input terminal 10 to a fixed level during the pedestal period of the NTSC signal, and outputs the result.
- a digital signal (for example, a carrier chrominance signal C) obtained by sampling the signal output from the clamp circuit 12 by the sampling clock is output to the output terminal 16.
- Reference numeral 18 denotes a reference color burst output circuit.
- the reference color burst output circuit 18 compares the output signal of the clamp circuit 12 with the slice level SL and outputs a square wave signal.
- a burst period sampling circuit 22 extracts a signal during a power burst period from an output signal of the level comparator 20, and outputs the signal as a reference color burst KK.
- Reference numeral 24 denotes a PLL circuit.
- the PLL circuit 24 compares the reference color burst KK output from the reference color burst output circuit 18 with a comparison signal as a reference signal, and outputs a voltage corresponding to the phase difference.
- the control signal output from the LPF 28 to the VCO 30 controls the oscillation frequency of the VCO 30 so that the phase difference between the reference color burst KK input to the phase comparator 26 and the comparison signal becomes smaller. Is synchronized with the reference color burst KK. At the time of this phase synchronization, the frequency of the sampling clock output from the VCO 30 to the AZD conversion circuit 14 is 4 Fsc.
- Reference numeral 34 denotes a phase detection circuit.
- the phase detection circuit 34 uses a sampling clock based on a level difference between an output signal of the AZD conversion circuit 14 and a preset phase reference value. The phase difference between the reference color burst and the reference color is detected, and the slice level corresponding to the phase difference is output to the reference color burst output circuit 18.
- Reference numeral 36 denotes a control signal output circuit.
- the control signal output circuit 36 detects a burst period from the output signal of the A / D conversion circuit 14 and sends the burst period to the burst period sampling circuit 22 as a sampling control signal. Is output during the burst period.
- the phase detection circuit 34 includes an adder 3 that adds a root adjustment value (for example, for color adjustment) to a phase reference value for NTSC (for example, 0.2097). 8, a comparison period generation circuit 40 for generating a comparison period signal corresponding to the phase comparison period for NTSC, and the AZD during the comparison period controlled by the comparison period signal of the comparison period generation circuit 40.
- the comparator 42 compares the output signal of the conversion circuit 14 with the phase reference value output from the adder 38, and outputs a signal corresponding to the level difference.
- the filter 44 and the PWM circuit 46 constitute a slice level output circuit 48.
- FIGS. 3 and 4 will be described with reference to FIG.
- the NTSC signal input to the input terminal 10 is clamped to a fixed DC level by the clamp circuit 12 during the pedestal period of the signal, and is input to the level comparator 20 to slice level. This signal is compared with SL, and a rectangular wave signal is output from the level comparator 20.
- the burst period sampling circuit 22 extracts the signal during the color burst period from the rectangular wave signal output from the level comparator 20 according to the burst period signal of the control signal output circuit 36.
- a rectangular wave reference color burst KK shown in FIG. 5 is output to the PLL circuit 24 as a reference signal.
- the horizontal axis represents the phase difference from the phase reference point (BY axis)
- the vertical axis represents the amplitude
- K represents the color burst of the frequency F sc.
- the phase of the reference color burst KK output from the reference color burst output circuit 18 changes at the slice level SL, and this slice level SL changes at the phase reference value in the phase detection circuit 34.
- the phase can be changed to a signal of frequency N ⁇ Fsc synchronized with the color burst K, and the phase can be continuously changed by the phase reference value.
- phase adjustment value When adjusting the phase of the sampling clock output from the PLL circuit 24 to the AZD conversion circuit 14 to a desired value (for example, a value at which the phase difference from the phase reference point (B_Y axis) is 57 °), a rectangular wave-like reference color is used.
- a value corresponding to the phase reference value for example, 0.2079) so that the phase at the rising point of the burst KK is a corresponding value (for example, a value that has a phase difference of 57 ° from the phase reference point).
- set the phase adjustment value to 0.
- the slice level SL output from the phase detection circuit 34 becomes a corresponding value (for example, 0.5446 ).
- the input signal is an NTSC signal (an example of a composite color signal)
- NTSC signal an example of a composite color signal
- the present invention is not limited to this. It can also be used for switchable NTSC and PAL signals, or for NTSC or PAL color signals.
- phase reference value switching circuit 50 is added before the adder 38 in the phase detection circuit 34, and depending on whether the input signal is an NTSC signal or a PAL signal, The phase reference value for NTSC (for example, 0.1079) and the phase reference value for PAL (for example, 0.000) are switched and output to the adder 38. You may.
- FIG. 7 shows an embodiment of the color demodulation circuit of the present invention, and the same parts as those in FIG.
- reference numeral 52 denotes a signal conversion circuit for converting the output signal (for example, signal C) of the A / D conversion circuit 14 into color difference signals I and Q.
- the signal conversion circuit 52 is shown in FIG. As shown, a multiplier 54 that multiplies the output signal of the AZD conversion circuit 14 by 11 and outputs the same, and an output signal of the AZD conversion circuit 14 and an output signal of the multiplier 54 1, a selection circuit 56 for selectively switching between the second selection signals and outputting as individual color difference signals I and Q.
- FIGS. 7 and 8 will be described with reference to FIG.
- phase reference value in the phase detection circuit 34 By setting the phase reference value in the phase detection circuit 34 to a value for NTSC (for example, -0.279) and setting the phase adjustment value to 0, the A / D conversion circuit 1
- a desired value for example, a value at which the phase difference from the phase reference point (B-Y axis) is 57 °
- the level difference between the output signal of the A / D conversion circuit 14 and the phase reference value also becomes the set value, and the slice level SL that is fed back from the phase detection circuit 34 to the reference color burst output circuit 18 Becomes the corresponding value (for example, 0.54 4 6), and the phase of the rising point of the reference color burst KK becomes the corresponding value (for example, 57 ° from the phase reference point).
- the output signal of the AZD conversion circuit 14 is a color signal in which the color difference signal is switched in the order of I, Q, I, and Q at the timing of the frequency 4Fsc.
- the selection circuit 56 switches the preceding switching unit with the first selection signal (frequency Fsc) shown in FIG. 9 (a) and switches the latter switching unit with the second selection signal (frequency Fsc) shown in FIG. 9 (b).
- the frequency is switched at 2 Fsc) and the color difference signals I and Q are output individually.
- the phase difference between the sampling clock and the phase reference point is obtained by changing the phase reference value and the phase adjustment value in the phase detection circuit 34. Since it can be changed continuously, the phase shift due to the signal delay in the level comparator 20 and the AZD conversion circuit 14 can be performed by adjusting the phase reference value and the phase adjustment value.
- the sampling clock output from the PLL circuit 24 to the AZD conversion circuit 14 To adjust the hue by intentionally shifting the phase of the phase from the desired value, set the phase adjustment value in the phase detection circuit 34 to the corresponding value, and adjust the phase to the phase reference value with the adder 38.
- the value obtained by adding the values (new phase reference value) is input to the comparator 42 as a comparison value.
- the phase of the sampling clock is adjusted to a predetermined value (a value obtained by adding a constant value to a desired value)
- the level difference between the output signal of the AZD conversion circuit 14 and the phase reference value also corresponds.
- the slice level SL fed back from the phase detection circuit 34 to the reference color burst output circuit 18 also changes to a corresponding value.
- the sampling clock output from the PLL circuit 24 to the A / D conversion circuit 14 is a signal with a frequency of 4 Fsc synchronized with the phase of the color burst K and a slice level SL (phase reference value and phase adjustment value).
- a signal that is phase-synchronized with the reference color burst KK phase-adjusted by, and only the color difference signals I and Q output from the signal conversion circuit 52 correspond to the phase adjustment value. It can change and adjust the color tone.
- the phase detection circuit can add the phase reference value for NTSC and the phase adjustment value for hue adjustment as shown in FIG. 4.
- the present invention is not limited to this.
- the phase detection circuit has a configuration in which the addition of the phase adjustment value is omitted and the phase detection circuit has only the NTSC phase reference value, or the phase detection circuit is for the NTSC as shown in FIG.
- the present invention can also be used for a configuration in which the phase reference value for PAL can be switched.
- the double-loop PLL circuit according to the present invention is:?
- the sampling clock output from the shift circuit to the 0 conversion circuit can be a signal of a frequency N ⁇ F sc synchronized with the color burst, and the phase can be continuously changed with the phase reference value. For this reason, for example, by adjusting the phase of the rising point of the reference color burst so that the phase difference from the phase reference point is 57 °, the sampling aperture for AZD conversion suitable for color demodulation is adjusted. Can be used to output the output.
- the color demodulation circuit using the double loop PLL circuit according to the invention can convert the output signal of the AZD conversion circuit into a color difference signal (for example, I, Q) by the signal conversion circuit. it can. Therefore, it can be used to easily and accurately demodulate the color difference signal from the composite video signal.
- a color difference signal for example, I, Q
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
- Synchronizing For Television (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU96506/98A AU745656B2 (en) | 1997-12-26 | 1998-10-30 | Dual-loop PLL circuit and chrominance demodulation circuit using the same |
EP98950458A EP1041829A4 (en) | 1997-12-26 | 1998-10-30 | TWO-LOOP PLL CIRCUIT AND CHROMINANCE DEMODULATION CIRCUIT USING THE SAME |
CA002315643A CA2315643A1 (en) | 1997-12-26 | 1998-10-30 | Dual-loop pll circuit and chrominance demodulation circuit using the same |
US09/554,448 US6522366B1 (en) | 1997-12-26 | 1998-10-30 | Dual-loop PLL circuit and chrominance demodulation circuit |
KR1020007007023A KR20010033521A (ko) | 1997-12-26 | 1998-10-30 | 2중루프pll회로 및 이 pll회로를 이용한색복조회로 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9369511A JPH11196431A (ja) | 1997-12-26 | 1997-12-26 | 2重ループpll回路及びこのpll回路を用いた色復調回路 |
JP9/369511 | 1997-12-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999034609A1 true WO1999034609A1 (fr) | 1999-07-08 |
Family
ID=18494610
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1998/004915 WO1999034609A1 (fr) | 1997-12-26 | 1998-10-30 | Circuit pll a deux boucles et circuit de demodulation de la chrominance utilisant ce dernier |
Country Status (9)
Country | Link |
---|---|
US (1) | US6522366B1 (ja) |
EP (1) | EP1041829A4 (ja) |
JP (1) | JPH11196431A (ja) |
KR (1) | KR20010033521A (ja) |
AU (1) | AU745656B2 (ja) |
CA (1) | CA2315643A1 (ja) |
RU (1) | RU2216124C2 (ja) |
TW (1) | TW406478B (ja) |
WO (1) | WO1999034609A1 (ja) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4034571B2 (ja) * | 2002-02-08 | 2008-01-16 | 松下電器産業株式会社 | 同期検出回路 |
KR100477646B1 (ko) * | 2002-05-29 | 2005-03-23 | 삼성전자주식회사 | 영상신호의 칼라 캐리어 보상장치 및 방법 |
US7321397B2 (en) * | 2003-09-10 | 2008-01-22 | Gennum Corporation | Composite color frame identifier system and method |
US7277134B2 (en) * | 2003-11-10 | 2007-10-02 | Matsushita Electric Industrial Co., Ltd. | Chrominance signal demodulation apparatus |
US7106239B1 (en) * | 2005-08-03 | 2006-09-12 | Qualcomm Incorporated | Rail-to-rail delay line for time analog-to-digital converters |
TW201012074A (en) * | 2008-09-15 | 2010-03-16 | Sunplus Technology Co Ltd | Frequency synthesis system with self-calibrated loop stability and bandwidth |
KR101260010B1 (ko) * | 2011-08-05 | 2013-05-06 | 주식회사 아이덴코아 | 보상기능을 갖는 비디오 디코딩 시스템 |
CN109218237B (zh) * | 2017-07-07 | 2021-02-19 | 扬智科技股份有限公司 | 实体层电路、时钟恢复电路与其频偏纠正方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS63152297A (ja) * | 1986-12-17 | 1988-06-24 | Nec Home Electronics Ltd | 色相調整方法 |
JPH0382291A (ja) * | 1989-08-25 | 1991-04-08 | Nec Corp | 位相同期装置 |
JPH06327022A (ja) * | 1993-05-18 | 1994-11-25 | Sharp Corp | クロックパルス発生装置 |
JPH0946720A (ja) * | 1995-07-28 | 1997-02-14 | Philips Japan Ltd | ディジタルクロマデコーダ |
JPH09154152A (ja) * | 1995-11-30 | 1997-06-10 | Sanyo Electric Co Ltd | サンプリングクロック再生回路 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4543600A (en) * | 1983-09-19 | 1985-09-24 | Rca Corporation | Digital signal phase measuring apparatus as for a phase-locked loop |
JPH0832059B2 (ja) * | 1987-03-09 | 1996-03-27 | 株式会社日立製作所 | ディジタルテレビジョン信号処理装置 |
EP0472332B1 (en) * | 1990-08-09 | 1995-11-08 | Victor Company Of Japan, Limited | Circuit for generating a clock signal which is locked to a specific phase of a color burst signal in a color video signal |
-
1997
- 1997-12-26 JP JP9369511A patent/JPH11196431A/ja active Pending
-
1998
- 1998-10-30 WO PCT/JP1998/004915 patent/WO1999034609A1/ja not_active Application Discontinuation
- 1998-10-30 RU RU2000120188/09A patent/RU2216124C2/ru not_active IP Right Cessation
- 1998-10-30 US US09/554,448 patent/US6522366B1/en not_active Expired - Fee Related
- 1998-10-30 EP EP98950458A patent/EP1041829A4/en not_active Withdrawn
- 1998-10-30 CA CA002315643A patent/CA2315643A1/en not_active Abandoned
- 1998-10-30 AU AU96506/98A patent/AU745656B2/en not_active Ceased
- 1998-10-30 KR KR1020007007023A patent/KR20010033521A/ko not_active Application Discontinuation
- 1998-11-30 TW TW087119831A patent/TW406478B/zh not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63152297A (ja) * | 1986-12-17 | 1988-06-24 | Nec Home Electronics Ltd | 色相調整方法 |
JPH0382291A (ja) * | 1989-08-25 | 1991-04-08 | Nec Corp | 位相同期装置 |
JPH06327022A (ja) * | 1993-05-18 | 1994-11-25 | Sharp Corp | クロックパルス発生装置 |
JPH0946720A (ja) * | 1995-07-28 | 1997-02-14 | Philips Japan Ltd | ディジタルクロマデコーダ |
JPH09154152A (ja) * | 1995-11-30 | 1997-06-10 | Sanyo Electric Co Ltd | サンプリングクロック再生回路 |
Non-Patent Citations (1)
Title |
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See also references of EP1041829A4 * |
Also Published As
Publication number | Publication date |
---|---|
AU745656B2 (en) | 2002-03-28 |
KR20010033521A (ko) | 2001-04-25 |
EP1041829A1 (en) | 2000-10-04 |
AU9650698A (en) | 1999-07-19 |
US6522366B1 (en) | 2003-02-18 |
CA2315643A1 (en) | 1999-07-08 |
RU2216124C2 (ru) | 2003-11-10 |
EP1041829A4 (en) | 2002-09-04 |
TW406478B (en) | 2000-09-21 |
JPH11196431A (ja) | 1999-07-21 |
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