CN103916143B - The non-contour step signal processing method of very low frequency long-wave transmitter and device - Google Patents
The non-contour step signal processing method of very low frequency long-wave transmitter and device Download PDFInfo
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- CN103916143B CN103916143B CN201310001944.6A CN201310001944A CN103916143B CN 103916143 B CN103916143 B CN 103916143B CN 201310001944 A CN201310001944 A CN 201310001944A CN 103916143 B CN103916143 B CN 103916143B
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Abstract
The invention relates to the non-contour step signal processing method of a kind of very low frequency long-wave transmitter and device, method wherein comprises: sample to the analog input signal of transmitter, analog-to-digital conversion and quantification treatment, obtains the quantized value of digital input signals; Ladder height value in the quantized value of this digital input signals and non-contour ladder height table is compared, is defined as the ladder height value of digital input signals by non-contour ladder height table with the immediate ladder height value of the quantized value of digital input signals; The control signal of corresponding power amplifier unit is produced according to the ladder height value of digital input signals; In the difference of the ladder height value of two all adjacent ladders wherein in non-contour ladder height table, have at least two differences not identical.The present invention can make the waveform of transmitter output signal as much as possible close to sinusoidal wave, thus makes the harmonic wave of transmitter be tending towards optimum state, effectively reduces signal distortion, and improves the performance index of transmitter.
Description
Technical field
The present invention relates to very low frequency longwave transmissions machine technology, particularly relate to the non-contour step signal processing method of a kind of very low frequency long-wave transmitter and device.
Background technology
Very low frequency long-wave transmitter is mainly used in by the sine wave signal of input by launching after the power amplifier unit amplification of its inside, and the waveform of the signal launched is better close to sine wave.
" core component " of very low frequency long-wave transmitter is Staircase wave device.Staircase wave device is arranged between signal source and high-power amplification unit, its role is to, and by controlling power amplifier unit each in transmitter, makes transmitter by the sine wave signal carrying complex information distortionless as far as possible " expressing " of input.The quality of Staircase wave device self performance directly can have influence on transmitter overall performance index.
At present, existing Staircase wave device is all the Staircase wave device of the simulation of building based on separating component usually, and all adopt contour step signal treatment technology, thus each ladder in the staircase waveform of existing very low frequency long-wave transmitter output signal is contour (namely the quantification of each step is highly identical), and the number of the power amplifier unit that each ladder is opened is identical.A concrete example, all power amplifier units (as 120 power amplifier units) in transmitter are equally divided into 12 groups, often organize power amplifier unit (as 10 power amplifier units) open simultaneously or turn off, the staircase waveform of transmitter output signal is 12 staircase waveforms, and namely the positive half cycle of transmitter output signal or the maximum step number of negative half period are 12; Thus the staircase waveform of transmitter output signal as shown in Figure 1.
Inventor is realizing finding in process of the present invention: the contour staircase waveform in Fig. 1 and sine wave are carried out contrast can obviously be found out, the reality " shape " of contour staircase waveform closer to triangular wave, and is not closer to sine wave.This is mainly because the waveform of the sine wave of reality is not identical at different its slopes of phase place place, and existing Staircase wave device has carried out the sine wave of transmitter input signal, and " contour " process causes; Transmitter complete machine harmonic wave finally can be caused to increase, and distorted signals is comparatively serious, creates harmful effect to transmitter overall performance index.
Because existing very low frequency long-wave transmitter Problems existing, the present inventor is based on being engaged in the practical experience and professional knowledge that this type of product design manufacture enriches for many years, and coordinate the utilization of scientific principle, actively in addition research and innovation, to founding the non-contour step signal processing method of a kind of very low frequency long-wave transmitter and device, existing very low frequency long-wave transmitter Problems existing can be overcome, make it have more practicality.Through continuous research and design, and through repeatedly studying sample and improvement, finally create the present invention had practical value.
Summary of the invention
Main purpose of the present invention is, overcome the technical problem that existing very low frequency long-wave transmitter exists, and the non-contour step signal processing method of a kind of very low frequency long-wave transmitter and device are provided, technical problem to be solved is, the waveform that very low frequency long-wave transmitter is outputed signal is as much as possible close to sinusoidal wave, thus make the harmonic wave of transmitter be tending towards optimum state, and effectively reduce signal distortion, improve transmitter performance index.
Object of the present invention and solve its technical problem and can adopt following technical scheme to realize.
According to the non-contour step signal processing method of a kind of very low frequency long-wave transmitter that the present invention proposes, comprise the steps: to sample to the analog input signal of very low frequency long-wave transmitter, and the analog input signal that sampling obtains is converted to digital input signals; Quantification treatment is carried out to described digital input signals, to obtain the quantized value of digital input signals; The quantized value of described digital input signals and the ladder height value in the non-contour ladder height table preset are compared, to determine ladder height value immediate with the quantized value of described digital input signals in described non-contour ladder height table, and described immediate ladder height value is defined as the ladder height value of described digital input signals; Produce the control signal of corresponding power amplifier unit in very low frequency long-wave transmitter according to the ladder height value of described digital input signals, and export described control signal to described corresponding power amplifier unit; Wherein, in the difference of the ladder height value of two all adjacent ladders in described non-contour ladder height table, have at least two differences not identical.
Preferably, aforesaid method, wherein saidly carries out quantification treatment to described digital input signals and comprises: carry out quantification treatment using the quantity of the power amplifier unit in described very low frequency long-wave transmitter as the maximum true amplitude of quantification treatment and minimal negative amplitude to described digital input signals.
Preferably, aforesaid method, wherein the set-up mode of this non-contour ladder height table comprises: sample to one of optional frequency desirable full sine wave, and quantize sampled result, to obtain the true value quantization table of this sine wave; According to the true value quantization table of described sine wave, described non-contour ladder height table is set; Wherein, describedly quantification is carried out to sampled result comprise: using the quantity of the power amplifier unit in described very low frequency long-wave transmitter as the maximum true amplitude of quantification treatment and minimal negative amplitude, described sampled result is quantized.
Preferably, aforesaid method, the wherein said sampled point quantity that one of optional frequency desirable full sine wave is sampled for: the ladder quantity that the positive half cycle of a complete staircase waveform or negative half period comprise and 4 product after, with 2 sums.
Preferably, aforesaid method, wherein in a complete described staircase waveform, has at least the quantity of the power amplifier unit corresponding to two ladders not identical.
According to the non-contour step signal processing unit of a kind of very low frequency long-wave transmitter that the present invention proposes, comprise following module: sampling module, for sampling to the analog input signal of very low frequency long-wave transmitter, and the analog input signal that this sampling obtains is converted to digital input signals; Quantization modules, for carrying out quantification treatment to described digital input signals, to obtain the quantized value of digital input signals; Control module, for the quantized value of described digital input signals and the ladder height value in the non-contour ladder height table preset are compared, to determine ladder height value immediate with the quantized value of described digital input signals in described non-contour ladder height table, and described immediate ladder height value is defined as the ladder height value of described digital input signals; Executive Module, for producing the control signal of corresponding power amplifier unit in very low frequency long-wave transmitter according to the ladder height value of described digital input signals, and exports described control signal to described corresponding power amplifier unit; Wherein, in the difference of the ladder height value of two all adjacent ladders in described non-contour ladder height table, have at least two differences not identical.
Preferably, aforesaid device, wherein said device is the digital staircase wave modulator in described transmitter, is arranged between signal source and each power amplifier unit.
Preferably, aforesaid device, wherein said quantization modules carries out quantification treatment using the quantity of the power amplifier unit in described very low frequency long-wave transmitter as the maximum true amplitude of quantification treatment and minimal negative amplitude to described digital input signals.
Preferably, aforesaid device, wherein said sampling module is realized by analog to digital converter, and described quantization modules and control module are realized by digital signal processor DSP, and described Executive Module is realized by on-site programmable gate array FPGA.
Preferably, aforesaid device, wherein said non-contour ladder height table is arranged according to following manner: described DSP samples to optional frequency desirable full sine wave, and quantizes sampled result, to obtain the true value quantization table of this sine wave; Described DSP arranges described non-contour ladder height table according to the true value quantization table of described sine wave; Wherein, describedly quantification is carried out to sampled result comprise: described DSP quantizes described sampled result using the quantity of the power amplifier unit in described very low frequency long-wave transmitter as the maximum true amplitude of quantification treatment and minimal negative amplitude.
By technique scheme, the non-contour step signal processing method of very low frequency long-wave transmitter of the present invention and device at least have following advantages and beneficial effect: the present invention by sampling to the analog input signal of transmitter, analog-to-digital conversion and quantification treatment, and the ladder height value in the quantized value of acquisition and non-contour ladder height table is compared, the ladder height value of each digital input signals can be determined; Because the ladder height value in non-contour ladder height table of the present invention is arranged based on not contour principle, therefore, the ladder height value of each ladder in non-contour ladder height table can be arranged in different its slope of phase place place this features not identical according to the waveform of sine wave completely, stepped ladder height be there are differences, and also can be not quite similar for the quantity of the power amplifier unit corresponding to each ladder; Like this, by the ladder height value according to digital input signals, each power amplifier unit is controlled accordingly, the waveform of transmitter output signal can be made as much as possible close to sinusoidal wave; Thus technical scheme provided by the invention can make the harmonic wave of transmitter be tending towards optimum state, and effectively can avoid the distortion phenomenon of transmitter output signal, and then improve the overall performance index of transmitter.
In sum, the present invention has significant progress technically, and has significantly positive technique effect, is really a new and innovative, progressive, practical new design.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of specification, and can become apparent to allow above and other object of the present invention, feature and advantage, below especially exemplified by preferred embodiment, and coordinate Figure of description, be described in detail as follows.
Accompanying drawing explanation
Fig. 1 is the contour staircase waveform of prior art and sinusoidal wave contrast schematic diagram;
Fig. 2 is the flow chart of the non-contour step signal processing method of very low frequency long-wave transmitter of the present invention;
Quantized value is of the present inventionly carried out described point one by one by Fig. 3, and with level and smooth curve, each described point is connected the curve obtained;
Fig. 4 is the partial step schematic diagram of sample quantization value of the present invention and non-contour staircase waveform;
Fig. 5 is the non-contour staircase waveform of transmitter of the present invention output and sinusoidal wave contrast schematic diagram;
Fig. 6 a is the schematic diagram of the sine wave based on the acquisition of sample quantization value of the present invention;
Fig. 6 b is the schematic diagram of non-contour staircase waveform of the present invention;
Fig. 7 is the structural representation of the non-contour step signal processing unit of very low frequency long-wave transmitter of the present invention.
Embodiment
For further setting forth the present invention for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, the non-contour step signal processing method of very low frequency long-wave transmitter propose foundation the present invention and the embodiment of device, flow process, structure, feature and effect thereof, be described in detail as follows.
The non-contour step signal processing method of embodiment one, very low frequency long-wave transmitter.The flow process of the method as shown in Figure 2.
In Fig. 2, S200, the analog input signal of very low frequency long-wave transmitter to be sampled, and the analog input signal that sampling obtains is converted to digital input signals.
Concrete, the present invention can be sampled according to the analog input signal (sine wave) of predetermined sampling frequency to transmitter by existing high-speed AD (modulus) transducer, and the analog input signal that sampling obtains is converted to digital input signals.
S210, quantification treatment is carried out to the digital input signals after above-mentioned analog-to-digital conversion, to obtain the quantized value of this digital input signals.
Concrete, the present invention can by DSP(digital signal processor) quantification treatment is carried out to the digital input signals after above-mentioned analog-to-digital conversion; So-called quantification treatment i.e. scaling in proportion, the amplitude of scaling can be determined according to practical application in proportion; A concrete example, using the total quantity of the power amplifier unit in very low frequency long-wave transmitter as the maximum true amplitude of quantification treatment and minimal negative amplitude, with these two amplitudes, quantification treatment is carried out to above-mentioned digital input signals, thus digital input signals after analog-to-digital conversion is after scaling in proportion, maximum true amplitude can not be exceeded, and also can not be less than minimal negative amplitude.
For convenience of follow-up flow processing, if digital input signals is after scaling in proportion, its result includes decimal, then can round scaling result according to the mode rounded up, to make the quantized value of digital input signals for integer.
One that digital input signals after analog-to-digital conversion is quantized concrete example, when including 120 power amplifier units in transmitters, the maximum true amplitude of the quantification treatment of digital input signals is set as+120, minimal negative amplitude is set as-120, then the quantized value after the digital input signals after the multiple analog-to-digital conversion of continuous print quantizes is as shown in table 1:
The sample quantization table of table 1 analog input signal
| 0 | 11 | 15 | 20 | 30 | 35 | 44 | 47 | 58 | 64 | 70 | 77 |
| 82 | 88 | 93 | 94 | 102 | 105 | 108 | 112 | 115 | 118 | 118 | 119 |
| 119 | 120 | 120 | 119 | 119 | 118 | 118 | 115 | 112 | 108 | 105 | 102 |
| 94 | 93 | 88 | 82 | 77 | 71 | 64 | 58 | 47 | 44 | 35 | 30 |
| 20 | 15 | 11 | 0 | -11 | -15 | -20 | -30 | -35 | -44 | -47 | -58 |
| -64 | -71 | -77 | -82 | -88 | -93 | -94 | -101 | -105 | -108 | -112 | -118 |
| -119 | -119 | -120 | -120 | -119 | -119 | -118 | -118 | -115 | -112 | -108 | -105 |
| -102 | -94 | -93 | -88 | -82 | -77 | -71 | -64 | -58 | -47 | -44 | -35 |
| -30 | -20 | -15 | -11 |
All quantized values in above-mentioned table 1 are carried out described point one by one, and is connected by each described point with level and smooth curve, its result as shown in Figure 3.In figure 3, input signal sine wave sampling analog-to-digital conversion and quantize after can obtain amplitude be+120 and-120 sine wave.
S220, the quantized value of above-mentioned digital input signals and the ladder height value in the non-contour ladder height table that presets to be compared, to determine ladder height value immediate with the quantized value of this digital input signals in non-contour ladder height table.
Concrete, the present invention can be performed the compare operation of quantized value and ladder height value by DSP.The present invention is previously provided with non-contour ladder height table, the non-contour ladder height table set as being previously stored with in DSP; The correspondence relationship information of all ladders in the waveform of a complete staircase waveform and ladder height value is included in this non-contour ladder height table.Due to the contour ladder height table of table right and wrong that the present invention pre-sets, therefore, in the difference of the ladder height value of all two adjacent ladders in the table, two differences are had at least to be not identical (normally plural difference are not identical); That is, stepped ladder height value relative to the ladder height value of low single order, its relative altitude uneven corresponding same numerical value, the relative altitude corresponding to different ladder normally there are differences.
This non-contour ladder height table of the present invention is arranged according to ideal sine wave, a concrete setting up procedure is: carry out sampling to the sine wave of optional frequency and calculate (as digital sample calculates), for a complete ideal sine wave, the ladder quantity that the total quantity of sampled point can comprise for the positive half cycle of a complete staircase waveform or negative half period and 4 product after, with 2 sums, namely the total quantity of the ladder that comprises of complete non-contour staircase waveform is (as the non-contour staircase waveform based on 12 ladders (namely quarter-wave shape comprises 12 ladders), the total quantity of sampled point should be 4 × 12+2=50), digital sample point (i.e. digital sample values also can be called true value) can be obtained from above-mentioned ideal sine wave, thus the truth table of this ideal sine wave can be obtained, based on the truth table of 50 sampled points an example as described in Table 2, afterwards, digital sample point is carried out quantification treatment, to obtain sinusoidal wave true value quantization table, based on the true value quantization table of 50 sampled points example as described in Table 3, the process of the quantification treatment to digital sampled point here can carry out quantification treatment process with the digital input signals after above-mentioned analog-to-digital conversion is identical, namely adopts identical maximum true amplitude and minimal negative amplitude and adopts the mode rounded up to round etc., after quantification treatment, the true value quantization table based on above-mentioned generation arranges non-contour ladder height table, and the positive half-cycle portions in the non-contour ladder height table produced based on table 3 as described in Table 4.
Table 2 is based on the truth table of 50 sampled points
| 0 | 0.125 | 0.249 | 0.368 | 0.482 | 0.588 | 0.685 | 0.771 | 0.844 | 0.905 |
| 0.951 | 0.982 | 0.998 | 0.998 | 0.982 | 0.951 | 0.905 | 0.844 | 0.771 | 0.685 |
| 0.588 | 0.482 | 0.368 | 0.249 | 0.125 | 0 | -0.125 | -0.249 | -0.368 | -0.482 |
| -0.588 | -0.685 | -0.771 | -0.844 | -0.905 | -0.951 | -0.982 | -0.998 | -0.998 | -0.982 |
| -0.951 | -0.905 | -0.844 | -0.771 | -0.685 | -0.588 | -0.482 | -0.368 | -0.249 | -0.125 |
Table 3 is based on the true value quantization table of 50 sampled points
Table 4 is based on the positive half-cycle portions in the non-contour ladder height table of 50 sampled points
| First ladder starting altitude | 0 | ||
| First ladder height | 15 | 7th ladder height | 93 |
| Second ladder height | 30 | 8th ladder height is | 101 |
| 3rd ladder height | 44 | 9th ladder height | 109 |
| Four-step height | 58 | Tenth ladder height | 114 |
| 5th ladder height | 71 | 11 ladder height | 118 |
| 6th ladder height | 82 | 12 ladder height | 120 |
Comparison procedure of the present invention can be specially: first judge that the quantized value of Contemporary Digital input signal is in (between the ladder height value as which two ladder) between which two height; Then, then compare in the quantized value of Contemporary Digital input signal and this two height (the ladder height values as two ladders) which closer to, to determine the quantized value of Contemporary Digital input signal belongs to which position (as which ladder).
Object lesson based on a comparison procedure of table 1 and table 4 is: the quantized value setting the digital input signals after current analog-to-digital conversion is 0 in table 1, can determine that the quantized value 0 of Contemporary Digital input signal is between 0 and 15 according to table 4, and closer to 0, therefore, can determine that with the immediate height value in 0 in table 1 be 0, and corresponding first ladder original position; The quantized value setting the digital input signals after current analog-to-digital conversion is 11 in table 1, can determine that the quantized value 11 of Contemporary Digital input signal is between 0 and 15 according to table 4, and closer to 15, therefore, can determine that immediate ladder height value is 15 with 11 in table 1, and the ladder of correspondence is the first ladder; The quantized value setting the digital input signals after current analog-to-digital conversion is 15 in table 1, can determine that the quantized value 15 of Contemporary Digital input signal is between 15 and 30 according to table 4, and closer to 15, therefore, can determine that immediate ladder height value is 15 with 15 in table 1, and the ladder of correspondence is the first ladder; The quantized value setting the digital input signals after current analog-to-digital conversion is 20 in table 1, can determine that the quantized value 20 of Contemporary Digital input signal is between 15 and 30 according to table 4, and closer to 15, therefore, can determine that immediate ladder height value is 15 with 20 in table 1, and the ladder of correspondence is the first ladder; The quantized value setting the digital input signals after current analog-to-digital conversion is 30 in table 1, can determine that the quantized value 30 of Contemporary Digital input signal is between 30 and 44 according to table 4, and closer to 30, therefore, can determine that immediate ladder height value is 30 with 30 in table 1, and the ladder of correspondence is the second ladder.
S230, the above-mentioned immediate ladder height value comparing acquisition is defined as the ladder height value of Contemporary Digital input signal.
Concrete, show by the form of table if ladder height value corresponding for each digital input signals pooled together, can form a ladder allocation table, the ladder allocation table produced based on above-mentioned table 1 and table 4 is as described in Table 5.
Table 5 ladder allocation table
| 0 | 15 | 15 | 15 | 30 | 30 | 44 | 44 | 58 | 58 | 58 | 71 |
| 82 | 82 | 93 | 93 | 101 | 101 | 101 | 109 | 114 | 118 | 118 | 118 |
| 118 | 120 | 120 | 118 | 118 | 118 | 118 | 114 | 109 | 101 | 101 | 101 |
| 93 | 93 | 82 | 82 | 71 | 71 | 58 | 58 | 44 | 44 | 30 | 30 |
| 15 | 15 | 0 | 0 | 0 | -15 | -15 | -30 | -30 | -44 | -44 | -58 |
| -58 | -71 | -71 | -82 | -82 | -93 | -93 | -101 | -101 | -101 | -109 | -118 |
| -118 | -118 | -120 | -120 | -118 | -118 | -118 | -118 | -114 | -109 | -101 | -101 |
| -101 | -93 | -93 | -82 | -82 | -71 | -71 | -58 | -58 | -44 | -44 | -30 |
| -30 | -15 | -15 | 0 |
Wherein, the ladder height value of the negative number representation digital input signals in above-mentioned table 5 is in staircase waveform negative half-cycle, needs anti-phasely to open corresponding power amplifier unit.Ladder allocation table can fully demonstrate the ladder height value of ladder belonging to each digital input signals and affiliated ladder thereof.
The non-contour staircase waveform based on 12 ladders shown in (b) in Fig. 4 can be drawn out according to table 4 and table 5; And (a) in Fig. 4 draws out according to table 1 and forms.
S240, produce the control signal of corresponding power amplifier unit in very low frequency long-wave transmitter according to the ladder height value of Contemporary Digital input signal, and export this control signal to this corresponding power amplifier unit.
Concrete, the present invention can by the operation of FPGA execution to control signal below power amplifier unit, and FPGA has strict sequential function.Here control signal is opened control signal as positive or is anti-phasely opened control signal, voltage control signal and timing control signal etc.The ladder information that FPGA can come according to DSP transmission and ladder height information, Volume control based on power amplifier unit produces corresponding timing control signal for corresponding power amplifier unit, this timing control signal is through careful algorithm design, can ensure power amplifier unit Striking symmetry in phase place completely.
When using FPGA, this FPGA has multiple I/O interface, directly be connected with each power amplifier unit by I/O interface, each power amplifier unit which ladder corresponding (i.e. which ladder height value corresponding) is determined by the software design patterns in FPGA, thus the connection based on " soft interface " and power amplifier unit achieved truly, this " soft interface " not only can realize controlling the independence of each power amplifier unit, and, also each power amplifier unit can be dispensed on any ladder.
The concrete example of of the non-contour staircase waveform that transmitter of the present invention exports is as shown in Fig. 5 and Fig. 6 b.Fig. 5 and Fig. 6 b shows the waveform of the non-contour staircase waveform based on 12 ladders that transmitter of the present invention exports, and Fig. 6 a is the sine wave obtained based on table 1 described point.By Fig. 5 or comparison diagram 6(a) and Fig. 6 (b) can find out very intuitively, the non-contour staircase waveform obtained by said method of the present invention can by signal source produce input signal more perfectly portray out.
The signal to noise ratio of the non-contour staircase waveform based on 12 ladders exported by the signal to noise ratio of contour staircase waveform that exports existing transmitter and transmitter of the present invention carries out Measurement and Computation, and result proves that the signal to noise ratio of not contour staircase waveform of the present invention can improve 10dB than the signal to noise ratio of existing contour staircase waveform.
The non-contour step signal processing unit of embodiment two, very low frequency long-wave transmitter.The structure of this device as shown in Figure 7.
In the figure 7, this non-contour step signal processing unit mainly comprises: sampling module 1, quantization modules 2, control module 3 and Executive Module 4.Wherein, quantization modules 2 is connected respectively with sampling module 1 and control module 3, and control module 3 is also connected with Executive Module 4, and Executive Module 4 is also connected with each power amplifier unit in transmitter.
Sampling module 1 is mainly used in sampling according to the analog input signal of predetermined sampling frequency to very low frequency long-wave transmitter, and the analog input signal that sampling obtains is converted to digital input signals.
Sampling module 1 can be existing high-speed AD (modulus) transducer, namely high-speed A/D converter is sampled according to the analog input signal (sine wave) of predetermined sampling frequency to transmitter, and the analog input signal that sampling obtains is converted to digital input signals, be transferred to quantization modules 2.
The digital input signals that quantization modules 2 is mainly used in sampling module 1 exports carries out quantification treatment, to obtain the quantized value of digital input signals.
Quantization modules 2 can be realized by DSP.And quantization modules 2 can using the total quantity of the power amplifier unit in transmitter as the maximum true amplitude of quantification treatment and minimal negative amplitude, with these two amplitudes, the digital input signals come is transmitted to sampling module 1 and carry out quantification treatment, thus the quantized value that quantization modules 2 produces can not exceed maximum true amplitude, and also can not be less than minimal negative amplitude.
For convenience of follow-up flow processing, quantization modules 2 is after scaling in proportion, if scaling result includes decimal, then quantization modules 2 can round scaling result according to the mode of rounding up, to make the quantized value of digital input signals for integer.
Non-contour ladder height table is previously stored with in control module 3, the ladder height value that control module 3 is mainly used in the quantized value of digital input signals quantization modules 2 exported and this non-contour ladder height table compares, to determine ladder height value immediate with the quantized value of digital input signals in non-contour ladder height table, and this immediate ladder height value determined is defined as the ladder height value of digital input signals.
Control module 3 can be realized by DSP, namely quantization modules 2 and control module 3 in dsp integrated.The correspondence relationship information of all ladders in a complete waveform and ladder height value is included in the non-contour ladder height table stored in control module 3, and in the difference of the ladder height value of all two adjacent ladders, have two differences not identical (normally plural difference is not identical) at least.
This non-contour ladder height table is arranged according to ideal sine wave, a concrete setting up procedure is: DSP carries out sampling to the sine wave of optional frequency and calculates, for a complete ideal sine wave, the ladder quantity that the total quantity of sampled point can comprise for the positive half cycle of a complete staircase waveform or negative half period and 4 product after, with 2 sums, namely the total quantity of the ladder that comprises of complete non-contour staircase waveform is (as the non-contour staircase waveform based on 12 ladders (namely quarter-wave shape comprises 12 ladders), the total quantity of sampled point should be 4 × 12+2=50), DSP can obtain digital sample point (i.e. digital sample values is also true value) from ideal sine wave, thus DSP can obtain sinusoidal wave truth table, afterwards, digital sample point is carried out quantification treatment by DSP, to obtain sinusoidal wave true value quantization table, the process of quantification treatment here can carry out quantification treatment process with the digital input signals after above-mentioned analog-to-digital conversion is identical, namely adopts identical maximum true amplitude and minimal negative amplitude and adopts the mode rounded up to round etc., after quantification treatment, DSP arranges non-contour ladder height table based on the true value quantization table of above-mentioned generation.
Executive Module 4 is mainly used in the control signal of corresponding power amplifier unit in the ladder height value generation very low frequency long-wave transmitter of the digital input signals determined according to control module 3, and exporting control signal to this corresponding power amplifier unit, this control signal is opened control signal as positive or is anti-phasely opened control signal, voltage control signal and timing control signal etc.
Executive Module 4 can be realized by FPGA, and the I/O interface of FPGA is directly connected with each power amplifier unit in transmitter, and FPGA can control each power amplifier unit and be in which ladder and its ladder height value at ladder.
The object lesson etc. of the concrete operations that above-mentioned each module performs and table see the description in said method embodiment, can not be repeated.
The above is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit technology of the present invention, any those skilled in the art are not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (9)
1. the non-contour step signal processing method of very low frequency long-wave transmitter, it is characterized in that, described method comprises:
The analog input signal of very low frequency long-wave transmitter is sampled, and the analog input signal that sampling obtains is converted to digital input signals;
Quantification treatment is carried out to described digital input signals, to obtain the quantized value of digital input signals;
The quantized value of described digital input signals and the ladder height value in the non-contour ladder height table preset are compared, to determine ladder height value immediate with the quantized value of described digital input signals in described non-contour ladder height table, and described immediate ladder height value is defined as the ladder height value of described digital input signals;
Produce the control signal of corresponding power amplifier unit in very low frequency long-wave transmitter according to the ladder height value of described digital input signals, and export described control signal to described corresponding power amplifier unit;
Wherein, in the difference of the ladder height value of two all adjacent ladders in described non-contour ladder height table, have at least two differences not identical; The set-up mode of described non-contour ladder height table comprises:
One of optional frequency desirable full sine wave is sampled, and sampled result is quantized, to obtain the true value quantization table of this sine wave;
According to the true value quantization table of described sine wave, described non-contour ladder height table is set;
Wherein, describedly quantification is carried out to sampled result comprise: using the quantity of the power amplifier unit in described very low frequency long-wave transmitter as the maximum true amplitude of quantification treatment and minimal negative amplitude, described sampled result is quantized.
2. the method for claim 1, is characterized in that, describedly carries out quantification treatment to described digital input signals and comprises:
Using the quantity of the power amplifier unit in described very low frequency long-wave transmitter as the maximum true amplitude of quantification treatment and minimal negative amplitude, quantification treatment is carried out to described digital input signals.
3. the method for claim 1, it is characterized in that, the described sampled point quantity that one of optional frequency desirable full sine wave is sampled for: the ladder quantity that the positive half cycle of a complete staircase waveform or negative half period comprise and 4 product after, with 2 sums.
4. the method as described in claim 1 or 2 or 3, is characterized in that, in a complete described staircase waveform, has at least the quantity of the power amplifier unit corresponding to two ladders not identical.
5. the non-contour step signal processing unit of very low frequency long-wave transmitter, it is characterized in that, described device comprises:
Sampling module, for sampling to the analog input signal of very low frequency long-wave transmitter, and is converted to digital input signals by the analog input signal that sampling obtains;
Quantization modules, for carrying out quantification treatment to described digital input signals, to obtain the quantized value of digital input signals;
Control module, for the quantized value of described digital input signals and the ladder height value in the non-contour ladder height table preset are compared, to determine ladder height value immediate with the quantized value of described digital input signals in described non-contour ladder height table, and described immediate ladder height value is defined as the ladder height value of described digital input signals;
Executive Module, for producing the control signal of corresponding power amplifier unit in very low frequency long-wave transmitter according to the ladder height value of described digital input signals, and exports described control signal to described corresponding power amplifier unit;
Wherein, in the difference of the ladder height value of two all adjacent ladders in described non-contour ladder height table, have at least two differences not identical; The set-up mode of described non-contour ladder height table comprises:
One of optional frequency desirable full sine wave is sampled, and sampled result is quantized, to obtain the true value quantization table of this sine wave;
According to the true value quantization table of described sine wave, described non-contour ladder height table is set;
Wherein, describedly quantification is carried out to sampled result comprise: using the quantity of the power amplifier unit in described very low frequency long-wave transmitter as the maximum true amplitude of quantification treatment and minimal negative amplitude, described sampled result is quantized.
6. device as claimed in claim 5, it is characterized in that, described device is the digital staircase wave modulator in transmitter, is arranged between signal source and each power amplifier unit.
7. device as claimed in claim 5, it is characterized in that, described quantization modules carries out quantification treatment using the quantity of the power amplifier unit in described very low frequency long-wave transmitter as the maximum true amplitude of quantification treatment and minimal negative amplitude to described digital input signals.
8. the device as described in claim 5 or 6 or 7, it is characterized in that, described sampling module is realized by analog to digital converter, and described quantization modules and control module are realized by digital signal processor DSP, and described Executive Module is realized by on-site programmable gate array FPGA.
9. device as claimed in claim 8, it is characterized in that, described non-contour ladder height table is arranged according to following manner:
Described DSP samples to optional frequency desirable full sine wave, and quantizes sampled result, to obtain the true value quantization table of this sine wave;
Described DSP arranges described non-contour ladder height table according to the true value quantization table of described sine wave;
Wherein, describedly quantification is carried out to sampled result comprise: described DSP quantizes described sampled result using the quantity of the power amplifier unit in described very low frequency long-wave transmitter as the maximum true amplitude of quantification treatment and minimal negative amplitude.
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