CN1140853A - Voltage generating method, voltage generating circuit and monitor device - Google Patents

Voltage generating method, voltage generating circuit and monitor device Download PDF

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Publication number
CN1140853A
CN1140853A CN96108032A CN96108032A CN1140853A CN 1140853 A CN1140853 A CN 1140853A CN 96108032 A CN96108032 A CN 96108032A CN 96108032 A CN96108032 A CN 96108032A CN 1140853 A CN1140853 A CN 1140853A
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China
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voltage
wave data
data
wave
voltage generating
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CN96108032A
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Chinese (zh)
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住野守彦
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/18—Generation of supply voltages, in combination with electron beam deflecting
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/63—Generation or supply of power specially adapted for television receivers

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Details Of Television Scanning (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

This invention is to use a little storage capacity for a storage part and to provide an inexpensive voltage generating circuit by reading data, for which curved line approximation is performed to a required voltage waveform, from the storage part, operating linearly approximated data and reproducing the waveform. It includes: the waveform data of curved line approximation, with which a parabolic wave voltage to be generated can be approximated by a little waveform data, are stored in a memory part 10 corresponding to a control value for controlling the contour of a display image. The waveform data of curved line approximation read from the memory 10 are inputted to a CPU. The output signal of a control value designating part for designating the control value for controlling the contour of the display image is inputted to the CPU 11. The waveform data of linear approximation operated by the CPU corresponding to the fetched waveform data of curved line approximation are inputted to a D/A converter 13.

Description

Voltage generating method, voltage generating circuit and monitor apparatus
The present invention relates to voltage generating method, voltage generating circuit and monitor apparatus.
In the monitor apparatus or television receiver of personal computer, can produce the pincushion distortion that the sort of horizontal amplitude that is illustrated by the broken lines on CRT 100 display images as shown in figure 13 changes in vertical direction.In order to proofread and correct this pincushion distortion, need the built-in generation parabola wave voltage generating circuit of vertical parabola wave voltage Vp as shown in Figure 14.
Figure 15 is the block scheme with the existing vertical parabola wave voltage generating circuit of digital signal generation parabola wave voltage.In storer 1, storing the Wave data of the approximate vertical parabola wave voltage (hereinafter referred to as parabola wave voltage) that should take place of straight line.Under the approximate a kind of parabola wave voltage condition of straight line, the approximate Wave data of straight line needs 512 words.Have at the parabola wave voltage waveform under 100 kinds the situation, need the Wave data of approximate each parabola wave voltage of straight line respectively.Thus, as shown in Figure 16, storer 1 is the tables of data of horizontal 512 words, vertical 100 row.
In tables of data, stored corresponding and Wave datas 512 words that straight line is approximate with the adjusted value of adjusting the display image profile.The Wave data of reading from storer 1 inputs to CPU2.Specify the output signal of the profile adjustment part 3 of its adjusted value of adjusting the display image profile to input to CPU2.The approximate Wave data of and straight line that from storer 1 read corresponding with specified adjusted value inputs to D/A 4.D/A 4 converts the digital signal of being imported to aanalogvoltage and the parabola wave voltage of simulating, and the parabola wave voltage that is taken place is inputed to monitor apparatus 5.
Come together to illustrate the work of this parabola wave voltage generating circuit below with Figure 17 process flow diagram of the control content of representing CPU2.The correction of carrying out the display image profile as the user promptly carry out display image pillow distortion equalizing operation and when specifying adjusted value, CPU2 reads the specified adjusted value (S1) of adjusting the display image profile.At this, specified adjusted value is " 2 " (S20.The signal of this adjusted value is transfused to CPU2, CPU2 output is corresponding to the address signal of the adjusted value of this appointment, thereby reads the Wave data of 512 words to obtain the approximate Wave data (S3) of straight line corresponding to the adjusted value " 2 " of the tables of data of Figure 15 from the section of the adjusted value " 2 " of tables of data.
CPU2 inputs to D/A 4 (S4) to the Wave data of 512 words of obtaining.Thus, D/A 4 carries out steering D/A conversion to the digital signal of the approximate Wave data of the straight lines of input and the parabola wave voltage of simulating, and inputs to monitor apparatus 5 then.Thus, proofread and correct the pincushion distortion of display image.
But, the storer of storing the approximate Wave data of the straight line of the above-mentioned this parabola wave voltage that should take place needs the memory capacity of (512 words * 100 row) * 2 bytes (wherein 1 word is 2 bytes), thereby just has the problem of the storer that must use costliness in the parabola wave voltage generating circuit.
In view of the above problems, the purpose of this invention is to provide a kind of voltage generating method, voltage generating circuit and monitor apparatus that can use the little storage part of memory capacity.
First invention relates to voltage generating method, the voltage of required waveform is taken place in it by digital signal, it is characterized in that, from storing the storage part of Wave data that voltage should take place curve approximation, read Wave data, the approximate Wave data of straight line of voltage should take place in the Wave data computing of passing through to be read, the Wave data of institute's computing is carried out steering D/A conversion and the voltage of simulating.
Second invention relates to voltage generating circuit, and the voltage of required waveform is taken place by digital signal; It is characterized in that, comprising: storing the storage part that the Wave data of voltage should take place curve approximation; Read the device of Wave data from storage part; The Wave data that passes through to be read comes the arithmetic unit of the approximate Wave data of computing straight line; The approximate Wave data of straight line after the computing is carried out the D/A switch portion of steering D/A conversion.
The 3rd invention relates to monitor apparatus, it is characterized in that, it is equipped with the described voltage generating circuit of second invention.
In first invention, the Wave data of the voltage that curve approximation should take place is stored in the storage part of 5 words * 100 row * 2 bytes of memory capacity for example.According to the Wave data of the curve approximation of reading from storage part, come the approximate Wave data of straight line waveform of the voltage that computing should take place.After the digital signal of the approximate Wave data of the straight line of institute's computing was carried out steering D/A conversion, the voltage of simulation took place.Be similar under the situation of the Wave data that voltage should take place at the storage straight line, the memory capacity of storage part needs for example 512 words * 100 row * 2 bytes.
In second invention, in storage part, stored the Wave data of the voltage that curve approximation should take place.The Wave data quantity that voltage should take place curve approximation is few, can be less than the device of the approximate Wave data of straight line, and storage part does not need the big storer of memory capacity.Read the Wave data of curve approximation from storage part, the Wave data approximate according to the Wave data computing straight line of being read.After the digital signal of the approximate Wave data of the straight line after the computing was carried out steering D/A conversion, the voltage of simulation took place.
Thus, can use the little storage part of memory capacity.
In the 3rd invention, the Wave data that voltage should take place according to curve approximation comes the approximate Wave data of computing straight line.The Wave data approximate the straight line after the computing carries out D/A switch, controls the show state of display image with resulting aanalogvoltage.
Thus, can adjust the show state of display image.
Describe the present invention in detail by the accompanying drawing of expression embodiment below.
Fig. 1 is the block scheme of the voltage generating circuit structure that the present invention relates to of expression.In storer 10, storing with the approximate Wave data that the curve approximation of parabola wave voltage should take place of a spot of Wave data, in the tables of data of vertical 100 row of horizontal 5 words shown in Figure 2, corresponding to the adjusted value of adjusting the display image profile.The Wave data of the curve approximation of reading from storer 10 is transfused to CPU11.
Specify the output signal of adjusted value specifying part 12 of the adjusted value of this adjustment display image profile to be transfused to CPU11.CPU11 inputs to D/A 13 to the approximate Wave data of straight line that the Wave data by obtained curve approximation carries out computing.D/A 13 is the digital signal conversion of the Wave data of input a simulating signal, so that the parabola wave voltage of simulation to take place.The parabola wave voltage of being exported from D/A 13 is transfused to the monitor apparatus 14 to display image.
Fig. 3 is the concept map under the approximate parabola wave voltage condition that should take place of straight line, under the approximate situation of straight line, as shown in Figure 3, needs the Wave data of a point of Building Y mark direction corresponding to a point of Building X mark direction.Therefore, because the curved portion of parabola wave voltage is many, under the situation of carrying out known cubic spline interpolation, concept map under the curve approximation situation as shown in Figure 4 is such, if the concept map under the curve approximation situation shown in 4 is such, if for example use the Wave data of a, b, c, d, e at 5, just can reproduce the curve that is similar to parabola wave voltage equally.
That is, by carrying out curve approximation, just can be with less coordinate information curve of approximation.For this reason, in the tables of data of storer 10, as described above,, only need store the Wave data of 5 words for a kind of parabola wave voltage.For 100 kinds of parabola wave voltages, store same Wave data.Thus, because can in storer 10, store the data of (5 * 100) * 2 byte (wherein 1 word is 2 bytes), then with need the situations of 512 words * 100 row * 2 bytes to compare when the approximate Wave data of storer 10 storage straight lines, can use the minimum expensive storage device of memory capacity.
Below, come together to illustrate the work of the voltage generating circuit of such formation with the process flow diagram of Fig. 5 of the control content of expression CPU11.When the user carries out the correction of display image profile, i.e. during the operation of the correction of display image pincushion distortion, CPU 11 obtains by the adjusted value of this operation appointment (S1).The adjusted value of this appointment be " 2 " (S2).The signal of adjusted value " 2 " inputs to CPU11, and CPU11 is corresponding to the address signal input store 10 of specified adjusted value, reads Wave data (S3) corresponding to the curve approximation of adjusted value " 2 " from storing 10 tables of data shown in Figure 2.
That is, read the Wave data of the curve approximation of 5 words from the section of the adjusted value " 2 " of tables of data.Then, calculate the Wave data (S4) of curve according to known cubic spline curve interpolating method by the Wave data of reading of CPU basis.Then, according to the Wave data of the curve of calculating, computing is corresponding to the approximate Wave data (S5) of Building Y target straight line of 512 of Building X marks.Then, identical with existing situation, the Wave data approximate the straight line after the computing inputs to D/A 13 (S6).Thus, D/A 13 is the digital signal conversion of the Wave data of input an aanalogvoltage, the parabola wave voltage of output simulation.When this parabola wave voltage input monitor 14, the profile polished object line wave voltage adjustment of the display image of monitor apparatus 14 and demonstrate the profile display image of adjusted value " 2 " corresponding to appointment.
In the prior art,, just need to use the great storer of memory capacity owing to Wave data at the approximate parabola wave voltage of memory stores straight line.And under curve approximation parabola wave voltage condition, only store a spot of Wave data in the storer, just can use the minimum expensive storage device of memory capacity.Thus, the cost that just can realize the parabola wave voltage generating circuit reduces.
Fig. 6 is the block scheme of another embodiment of the voltage generating circuit that the present invention relates to of expression.The structure of this Fig. 6 is: the Sawtooth waves voltage that the straight vertical linearity takes place to proofread and correct.
Storing in storer 10A can be with the approximate 1 periodic waveform data that the curve approximation of sine voltage should take place of a small amount of Wave data, in the tables of data of vertical 100 row of horizontal 8 words shown in Figure 7 corresponding to the adjusted value of the straight vertical linearity of adjusting display image.The Wave data of the curve approximation of the sine wave of reading from storer 10A is transfused to CPU11.
Specify the output signal of adjusted value specifying part 12 of the adjusted value of this adjustment display image straight vertical linearity to be transfused to CPU11.After reading from storer 10A, CPU11 carries out computing according to the Wave data of obtained curve approximation, and the approximate Wave data of the resulting sinusoidal wave straight line of computing is transfused to D/A 13A.1 periodic waveform data to store the Sawtooth waves voltage that should take place with the sine voltage same period in storer 10B.After storer 10B reads, CPU11 inputs to D/A 13B to the Wave data of the Sawtooth waves voltage of obtaining.D/A 13A becomes simulating signal to the digital signal conversion of the Wave data of the sine wave of input, so that the sine voltage of simulation to take place.D/A 13B becomes simulating signal to the digital signal conversion of Wave data of the Sawtooth waves of input and the Sawtooth waves voltage of simulating.
Be transfused to the synthetic portion 16 of waveform from the sine voltage of D/A 13A output with from the Sawtooth waves voltage that D/A switch 13B exports.The synthetic portion 16 of waveform synthesize the sine voltages of input and Sawtooth waves voltage and Sawtooth waves voltage behind the output calibration, and the Sawtooth waves voltage after the correction of exporting from the synthetic portion 16 of waveform is transfused to the not shown vertical circuit of the monitor apparatus 14 of display image.
Fig. 8 is the block scheme of the structure of the synthetic portion 16 of expression waveform, and the outgoing side of D/A 13A is through resistance R 1The back is with operational amplifier OA 1Negative input end one link to each other.Operational amplifier OA 1Negative input end one and output terminal OP between the cross-over connection capacitor C 1And resistance R 2Parallel circuit.Operational amplifier OA 1Output terminal OP through capacitor C 2And resistance R 3Series circuit after link to each other with the positive input terminal ten of operational amplifier OA2.
The outgoing side of D/A 13B passes through R 4With operational amplifier OA 3Negative input end one link to each other.At operational amplifier OA 3Negative input end cross-over connection capacitor C between the output terminal OP together 3And resistance R 5Parallel circuit, negative input end is operational amplifier OA together 1Positive input terminal ten link to each other.Operational amplifier OA 3Positive input terminal ten ground connection, output terminal OP is through resistance R 6With operational amplifier OA 2Positive input terminal ten link to each other.Operational amplifier OA 2Negative input end together its output terminal OP link to each other, be connected on the not shown vertical circuit of monitor apparatus 14.
Fig. 9 is that the concept map under the sine voltage situation should take place curve approximation.As shown in Figure 9, if use 4 Wave datas that amount to j, k, l, m, o, p, q, r at 8 in the positive and negative side of sine wave respectively, just can reproduce the curve of near sinusoidal wave voltage.That is, identical by curve approximation with above-mentioned parabola wave voltage condition, just can be with less coordinate information curve of approximation.Thus, at storer 10A Wave data.In tables of data, for 100 kinds of sine voltages, stored waveform data equally.
Thus, because can in storer 10A, store the data of (8 * 100) * 2 byte (wherein 2 bytes are 1 word), then compare with the above-mentioned situations of 512 words * 100 row * 2 bytes that need when depositing straight line approximate waveform data, storer 10A can use the minimum expensive storage device of memory capacity.
Below come together to illustrate the action of the voltage generating circuit of this structure with the process flow diagram of Figure 10 of the control content of expression CPU.When the user carried out the operation of correction of display image straight vertical linearity, CPU11 obtained by the adjusted value of this operation appointment (S11).At this, specified adjusted value be " 2 " (S12).The signal of adjusted value " 2 " is transfused to CPU11, and CPU11 inputs to storer 10A to the address signal corresponding to the adjusted value of appointment, reads Wave data (S13) corresponding to the curve approximation of adjusted value " 2 " from the tables of data shown in Figure 7 of storer 10A.That is, read the Wave data of the curve approximation of 4 words from the section of the adjusted value " 2 " of tables of data.
Then, according to the Wave data of reading by PCU11, calculate the Wave data (S14) of curve according to known 3 spline interpolation methods.Then, come the Building Y target straight line approximate Wave data (S15) of computing according to the curve waveform data of calculating corresponding to 512 of Building X marks.Then, identical with existing situation, the approximate Wave data input D/A 13A (S16) of the straight line after the computing.Then, the address signal that the CPU11 handle is identical with the address signal of input store 10A is input to storer 10B, reads the Wave data (S17) of Sawtooth waves from storer 10B.Thereby, the Wave data of the Sawtooth waves of obtaining input D/A 13B (S18).
Thus, D/A 13A becomes aanalogvoltage to the digital signal conversion of the Wave data of the sine wave of input, the sine voltage V of the simulation shown in output Figure 11 (a) AD/A 13B becomes aanalogvoltage to the digital signal conversion of the Wave data of the Sawtooth waves of input, the Sawtooth waves voltage V of the simulation shown in output Figure 11 (b) BThese voltages are all imported the synthetic portion 16 of waveform, by operational amplifier OA 1, OA 3After amplifying respectively, by operational amplifier OA 2Synthesis sine voltage and Sawtooth waves voltage, thus take place and output Figure 11 (C) shown in the Sawtooth waves voltage V that proofreaies and correct by sine voltage CThe Sawtooth waves voltage V that is proofreaied and correct CBecome at corresponding sine voltage V AMoment of semiperiod go up the bigger waveform of change in voltage.
Sawtooth waves voltage V when this correction CDuring the not shown vertical circuit of input monitor 14, the rectilinearity of the display image of monitor apparatus 14 is proofreaied and correct by the Sawtooth waves voltage after proofreading and correct, and it is such shown in Figure 12 (a) to import uncorrected Sawtooth waves voltage condition, near the central authorities of the display image vertical direction on the CRT 100, influence because of stray magnetic field, it is big that the interval of sweep trace L becomes, the rectilinearity variation, but, such shown in Figure 12 (b), adjusted value " 2 " according to appointment has been proofreaied and correct the straight vertical linearity, and then the interval of sweep trace L is constant, demonstrates the linear excellent images of straight vertical.
Identical with parabola wave voltage what happens, under the situation that sine voltage takes place, in storer, stored the Wave data of curve approximation sine wave, in the case, can use the minimum expensive storage device of memory capacity, reduce with the cost of the voltage generating circuit of the Sawtooth waves voltage realize to take place proofreaied and correct.
Though the Wave data of employed curve approximation is 5 words or 8 words in the present embodiment, target point in Building X is 512, and self-evident, this just illustrates.
As described above, the Wave data that the curve approximation of voltage should take place has been stored in first invention in storage part.Wave data according to the curve approximation of reading from storage part comes the approximate Wave data of computing straight line, and voltage takes place, and uses the little storer of memory capacity thus in storage part, and voltage can take place at an easy rate.
Second invention, owing to storing the Wave data of the curve approximation of the voltage that should take place in storage part, it is less that the Wave data of voltage should take place curve approximation, just can use the little expensive storage portion of memory capacity, and cheap voltage generating circuit can be provided, the present invention has superior effect.
Fig. 1 is the block scheme of the structure of the voltage generating circuit that the present invention relates to of expression;
Fig. 2 is the concept map of the tables of data of storer;
Fig. 3 is the concept map under the approximate parabola wave voltage condition of straight line;
Fig. 4 is the concept map under the curve approximation parabola wave voltage condition;
Fig. 5 is the process flow diagram of the control content of expression CPU;
Fig. 6 is the block scheme of another example structure of the voltage generating circuit that the present invention relates to of expression;
Fig. 7 is the concept map of the tables of data of storer;
Fig. 8 is the block scheme of the synthetic portion of expression waveform structure;
Fig. 9 is the concept map under the curve approximation sinusoidal voltage situation;
Figure 10 is the process flow diagram of the control content of expression CPU;
Figure 11 is an oscillogram sinusoidal wave, that zigzag involves the Sawtooth waves after the correction;
Figure 12 is the key diagram of the show state of display image;
Figure 13 is the key diagram of the pincushion distortion of display image;
Figure 14 is the oscillogram of vertical parabola wave voltage;
Figure 15 is the block scheme of existing parabola wave voltage generating circuit;
Figure 16 is the concept map of the tables of data of storer;
Figure 17 is the process flow diagram of the control content of expression CPU.
Label declaration:
10: storer, 11:CPU, 12: the adjusted value specifying part, 13: D/A, 16: waveform synthesizes portion.

Claims (3)

1. voltage generating method, the voltage of required waveform takes place by digital signal, it is characterized in that, read Wave data from storing the storage part that the Wave data of voltage should take place curve approximation, by the Wave data computing of reading the approximate Wave data of straight line of voltage should take place, the Wave data after the computing is carried out steering D/A conversion and the voltage of simulating.
2. the voltage of required waveform takes place by digital signal in voltage generating circuit, it is characterized in that comprise: the storage part of the Wave data of voltage should take place the storage curve approximation; Go out the device of Wave data from memory read; Carry out the arithmetic unit of the approximate Wave data of straight line by the Wave data computing of reading; The approximate Wave data of straight line after the computing is carried out the D/A switch portion of steering D/A conversion.
3. monitor apparatus is equipped with the described voltage generating circuit of claim 2.
CN96108032A 1995-05-31 1996-05-31 Voltage generating method, voltage generating circuit and monitor device Pending CN1140853A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP133375/95 1995-05-31
JP7133375A JPH08331404A (en) 1995-05-31 1995-05-31 Voltage generating method, voltage generating circuit and monitoring device

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CN1140853A true CN1140853A (en) 1997-01-22

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KR (1) KR100269755B1 (en)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100353669C (en) * 2002-04-17 2007-12-05 湖南科技大学 Virtual signal generator for generating square wave by remainder interpolation comparision

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6498626B1 (en) 1999-05-26 2002-12-24 Thomson Licensing S.A. Video signal processing arrangement for scan velocity modulation circuit
US6295097B1 (en) 1999-05-26 2001-09-25 Thomson Licensing S.A. Piece-wise linearized waveform generator for scan velocity modulation circuit
US6493040B1 (en) 1999-05-26 2002-12-10 Thomson Licensing S.A. Scan velocity modulation circuit with multi-mode operation

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2579390A1 (en) * 1985-03-22 1986-09-26 Enertec DIGITAL WAVEFORM GENERATOR AND METHOD THEREOF

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100353669C (en) * 2002-04-17 2007-12-05 湖南科技大学 Virtual signal generator for generating square wave by remainder interpolation comparision

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TW349195B (en) 1999-01-01
JPH08331404A (en) 1996-12-13
KR100269755B1 (en) 2000-10-16
KR960043756A (en) 1996-12-23

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