CN100358335C - Method for designing IC of modulating scanning speed of television set - Google Patents
Method for designing IC of modulating scanning speed of television set Download PDFInfo
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- CN100358335C CN100358335C CNB2005100441734A CN200510044173A CN100358335C CN 100358335 C CN100358335 C CN 100358335C CN B2005100441734 A CNB2005100441734 A CN B2005100441734A CN 200510044173 A CN200510044173 A CN 200510044173A CN 100358335 C CN100358335 C CN 100358335C
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Abstract
The present invention relates to a method for designing an integrated circuit for modulating the scanning speed of a television, which comprises the following steps: a logic delay module and a comparator are design, a Y signal is input to the module through an input end, a certain adjacent dot of a pixel dot is selected and compared with the brightness signal of the original pixel dot to obtain the brightness changing value Y-diff of the two dots; a multiplicative operation device is designed to carry out the multiplicative operation with adjustable scaling multiples for Y-diff to realize the adjustable amplitude of a modulated signal; a low-pass filer with an adjustable parameter is designed to filter the high-frequency part of the signal after multiplicative operation; a delay circuit is designed to carry out multi-stage sequential time delay processing for the signal passing through the low-pass filter so as to realize the adjustable phase of the modulated signal; a digital-analogue converter is designed to carry out digital-analogue conversion for the signal after delay so as to obtain a scanning velocity modulation signal, and the digital-analogue converter is connected in parallel with an output end, etc. The method of the present invention has the advantages of simple circuit, convenient integration, adjustable parameter, convenient control, good effect and low cost. The method of the present invention can be used for designing integrated circuits of CRT televisions.
Description
Technical field
The invention belongs to the integrated circuit (IC) design field, this technology is at the optimization problem of scanning circuit in the CRT system for TV set and propose, and produces one tunnel scan control signal that is used to improve the television video effect by the integrated a series of treatment circuits of chip.
Background technology
In the reading scan process of CRT television set, problems such as the not obvious and edge blurry of black-to-white level transitional effect appear easily.Therefore, the VM scanning coil of CRT picture tube must load one road signal to realize the velocity variations of shows signal.And scan velocity modulation circuit is exactly the important circuit that improves the TV images quality.Come the controlling electron beam horizontal sweep speed according to the difference of video amplitude,, play the crisperding effect and improve the definition of image with regard to may command image bright-dark degree.
Mostly traditional solution is to build analog circuit to realize velocity modulation.But above-mentioned conventional method circuit structure is quite complicated, is not easy to integratedly, and parameter is non-adjustable, and control is inconvenient, and effect is obvious inadequately, and cost is also high.
Summary of the invention
Purpose of the present invention just is to overcome above-mentioned shortcoming and defect, and a kind of method for designing of IC of modulating scanning speed of television set is provided.Its circuit structure is simple, is convenient to be integrated into chip internal, and parameter is adjustable, and control is convenient, and effect is obvious, and cost reduces greatly.It can be widely used in the CRT television set.
In order to achieve the above object, the present invention includes following steps:
(1) design module in one logical delay is imported module in this with the Y-signal in the YC passage processing procedure by input in logical delay, selects the luminance signal of adjacent certain point of this picture element, so that subsequent module compares;
(2) design one and the comparator that logical delay, module was connected compare present picture element point with postponing the back picture element, obtain exporting Y-diff;
(3) design one multiplicative operator that is connected with comparator carries out the adjustable multiplying of convergent-divergent multiple with Y-diff, and is adjustable with the amplitude that realizes the velocity modulation signal;
(4) design one parameter that is connected with multiplicative operator adjustable low pass filter, the HFS filtering of signal that will be after multiplying;
(5) the design one sequencing control delay circuit that is connected with low pass filter carries out multistage sequencing control delay processing with the signal after low-pass filtering, and is adjustable with the phase place that realizes the velocity modulation signal;
(6) design one D/A that is connected with delay circuit carries out digital-to-analogue conversion with the signal after delayed, obtains scanning speed modulating signal and is exported by output.
The parameters of above-mentioned steps all adopts iic bus control.
Basic principle of the present invention is: digital video signal is in carrying out YC passage processing procedure, Y-signal (luminance signal) is produced the input of logic comparison module as velocity modulation, select adjacent certain point of this picture element, compare with the luminance signal of former picture element, obtain 2 brightness changing value Y-diff.
Adjustable for the amplitude that satisfies the velocity modulation signal, the convergent-divergent that Y-diff can be gained, the i.e. adjustable multiplying of convergent-divergent multiple.May have a negative impact to the scanning effect because be higher than the velocity modulation signal of certain frequency,, be loaded in the streamline of signal processing, the HFS of signal can be filtered out so need the adjustable low pass filter of what a parameter of design.To remake some grades then through the signal that low pass filter deals and postpone to handle, adjustable with the phase place that realizes the velocity modulation signal.
To carry out digital-to-analogue conversion through the digital signal of above-mentioned processing at last, output is the required scanning speed modulating signal of scanning coil.
Form in the course of work of scanning speed modulating signal circuit in this vision signal, the parameters of velocity modulation signal has all been adopted the control adjusted based on the iic bus structure, the multiple parameters of having finished final video signal formation scanning speed modulating signal is adjustable, has guaranteed the positive effect of this circuit.
Task of the present invention comes to this and finishes.
The invention provides a kind of method for designing of IC of modulating scanning speed of television set.Its circuit structure is simple, is convenient to be integrated into chip internal, and parameter is adjustable, and control is convenient, and effect is obvious, and cost reduces greatly.It can be widely used in the CRT television set.
Description of drawings
Fig. 1 is a functional-block diagram of the present invention.
Embodiment
Embodiment 1.A kind of method for designing of IC of modulating scanning speed of television set, as shown in Figure 1.It may further comprise the steps:
(1) design module 1 in one logical delay by input 7 inputs module in this 1, selects the luminance signal of adjacent certain point of this picture element, so that subsequent module compares with the Y-signal in the YC passage processing procedure in logical delay;
(2) design one and the comparator 2 that logical delay, module 1 was connected, with present picture element point with postpone after picture element compare, obtain 2 brightness variations and export Y-diff;
(3) design one multiplicative operator 3 that is connected with logic comparator 2 carries out the adjustable multiplying of convergent-divergent multiple with Y-diff, and is adjustable with the amplitude that realizes the velocity modulation signal;
(4) design one parameter that is connected with multiplicative operator 3 adjustable low pass filter 4, the HFS filtering of signal that will be after multiplying;
(5) the design one sequencing control delay circuit 5 that is connected with low pass filter 4 carries out multistage sequencing control delay processing with the signal after low-pass filtering, and is adjustable with the phase place that realizes the velocity modulation signal;
(6) design one D/A 6 that is connected with delay circuit 5 carries out digital-to-analogue conversion with the signal after delayed, obtains scanning speed modulating signal and is exported by its output 8.
The parameters of above-mentioned steps all adopts iic bus 9 controls.
Scan velocity modulation circuit is one of important circuit that improves picture quality, and it is to take out the vertiginous marginal element of luminance signal to go the modulated electron beam horizontal sweep speed, makes image distincter, clearer.
Embodiment 1 circuit structure is simple, is convenient to be integrated into chip internal, and parameter is adjustable, and control is convenient, and effect is obvious, and cost reduces greatly.It can be widely used in the CRT television set.
Claims (2)
1. the method for designing of an IC of modulating scanning speed of television set is characterized in that it may further comprise the steps:
(1) the brightness Y-signal of present picture element point in the digital video signal YC passage processing procedure is imported one logical delay module, with the luminance signal of adjacent certain point of selecting this picture element;
(2) present picture element point and the luminance signal that postpones the back picture element are compared by a comparator, obtain 2 brightness changing value Y-diff;
(3) 2 brightness changing value Y-diff are carried out the adjustable multiplying of convergent-divergent multiple by a multiplicative operator, and realize that the amplitude of velocity modulation signal is adjustable;
(4) by the adjustable low pass filter of a parameter will be after multiplying the HFS filtering of signal;
(5) signal after low-pass filtering is carried out multistage sequencing control delay processing by a sequential control lag circuit, and realize that the phase place of velocity modulation signal is adjustable;
(6) signal after delayed is carried out digital-to-analogue conversion by a D/A, form scanning speed modulating signal and connect output.
2. according to the method for designing of the described IC of modulating scanning speed of television set of claim 1, it is characterized in that the parameters of above-mentioned steps all adopts iic bus control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100441734A CN100358335C (en) | 2005-07-25 | 2005-07-25 | Method for designing IC of modulating scanning speed of television set |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100441734A CN100358335C (en) | 2005-07-25 | 2005-07-25 | Method for designing IC of modulating scanning speed of television set |
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| Publication Number | Publication Date |
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| CN1719868A CN1719868A (en) | 2006-01-11 |
| CN100358335C true CN100358335C (en) | 2007-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100441734A Expired - Fee Related CN100358335C (en) | 2005-07-25 | 2005-07-25 | Method for designing IC of modulating scanning speed of television set |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06326885A (en) * | 1993-05-13 | 1994-11-25 | Mitsubishi Electric Corp | Scanning speed modulation circuit for television receiver |
| US5619279A (en) * | 1994-10-26 | 1997-04-08 | U.S. Philips Corporation | Video circuit using scan velocity modulation |
| CN1305682A (en) * | 1998-06-12 | 2001-07-25 | 松下电器产业株式会社 | Video display apparatus with vertical scan velocity modulation and video display method therefor |
| CN1514642A (en) * | 1990-08-02 | 2004-07-21 | ��ķɭ���ѵ�������˾ | Electron beam scanning speed modulator |
| CN2694659Y (en) * | 2004-03-25 | 2005-04-20 | 四川长虹电器股份有限公司 | Cathode-ray tube projection TV scanning velocity modulation circuit |
-
2005
- 2005-07-25 CN CNB2005100441734A patent/CN100358335C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1514642A (en) * | 1990-08-02 | 2004-07-21 | ��ķɭ���ѵ�������˾ | Electron beam scanning speed modulator |
| JPH06326885A (en) * | 1993-05-13 | 1994-11-25 | Mitsubishi Electric Corp | Scanning speed modulation circuit for television receiver |
| US5619279A (en) * | 1994-10-26 | 1997-04-08 | U.S. Philips Corporation | Video circuit using scan velocity modulation |
| CN1305682A (en) * | 1998-06-12 | 2001-07-25 | 松下电器产业株式会社 | Video display apparatus with vertical scan velocity modulation and video display method therefor |
| CN2694659Y (en) * | 2004-03-25 | 2005-04-20 | 四川长虹电器股份有限公司 | Cathode-ray tube projection TV scanning velocity modulation circuit |
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Granted publication date: 20071226 Termination date: 20130725 |