CN101827054B - Precompensation method and device of nonlinear distortion and transmitter - Google Patents
Precompensation method and device of nonlinear distortion and transmitter Download PDFInfo
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Abstract
The invention provides precompensation method and device of nonlinear distortion and a transmitter. The precompensation method comprises the following steps of: obtaining each sub audio frequency signal in audio frequency signals respectively corresponding to a plurality of preset frequency ranges; obtaining amplitude of the sub audio frequency signals and amplitude of a carrier wave; adjusting the amplitude of each sub audio frequency signal according to adjustment parameters corresponding to each preset frequency range, the amplitude of each sub audio frequency signal and the amplitude of the carrier wave; accumulating a plurality of amplitude-adjusted sub audio frequency signals and sending to a pulse step modulating transmitter so that the transmitter modulates and transmits amplitude-adjusted audio frequency signals. The precompensation device comprises a sub audio frequency signal obtaining module consisting of a plurality of wave filters, an amplitude obtaining module, an amplitude adjusting module and a signal sending module. The transmitter comprises the precompensation device of the nonlinear distortion. The precompensation method and device and the transmitter provided by the invention use the adjusted amplitude of the audio frequency signals to compensate the nonlinear distortion and have simple realization compared with the prior art.
Description
Technical field
The embodiment of the invention relates to technical field of radio, relates in particular to a kind of precompensation method and device and transmitter of nonlinear distortion.
Background technology
Short-wave transmitter mainly uses pulse step modulation (Pulse Step Modulation at present; Abbreviate as: PSM) mode is come audio signal modulation, and transmitting power commonly used is the emission type of 100kw, 150kw, 500kw.Wherein there is nonlinear distortion in the power amplifier of PSM modulation broadcast transmitter, and it is asymmetric that nonlinear distortion is mainly reflected in the positive negative peak of modulating the modulated signal of exporting, and this nonlinear distortion can be destroyed tonequality.
Prior art is the way compensating non-linear distortion through feedback compensation mainly, and a kind of method commonly used is with after the output sampling demodulation, sends into harmonic distortion and the intermodulation compensation unit compensates, and the signal after compensating is exported as final signal.Wherein backoff algorithm adopts Wal Thailand to draw the number compensation of three classes usually, through this feedback signal is done the compensating parameter of distinguishing and train input signal, is compensated by the output signal of this compensating parameter adjustment input signal to transmitter.Nonlinear distortion that by this method can compensating power amplifier.
But the processing resource that existing algorithm expends is more, and is also higher to the feedback sample required precision.
Summary of the invention
The embodiment of the invention provides a kind of precompensation method and device and transmitter of nonlinear distortion; Expend when the compensating non-linear distortion and handle the more defective with the feedback sample precision of having relatively high expectations of resource in order to solve prior art, realize simple compensation nonlinear distortion.
The embodiment of the invention provides a kind of precompensation method of nonlinear distortion, comprising:
In the audio signal of input, obtain the sub-audio signal corresponding respectively with a plurality of preset frequency ranges;
Obtain the amplitude of carrier wave of amplitude and the said audio signal of a plurality of said sub-audio signals;
According to the amplitude of each said preset frequency range adjustment parameter corresponding, storage in advance, the sub-audio signal corresponding and the amplitude of said carrier wave with each said preset frequency range; Each said sub-audio signal is carried out the amplitude adjustment, the nonlinear distortion that produces when directly modulating said audio signal with compensated pulse ladder modulation transmitter;
A plurality of sub-audio signals through the amplitude adjustment are added up; Form audio signal through the amplitude adjustment; And send to said pulse step modulation transmitter, so that said pulse step modulation transmitter carries out modulate emission to said audio signal through the amplitude adjustment.
The embodiment of the invention provides a kind of precompensation device of nonlinear distortion, comprising:
The sub-audio signal acquisition module is used for the audio signal in input, obtains the sub-audio signal corresponding with a plurality of preset frequency ranges;
The amplitude acquisition module is used to obtain the amplitude of carrier wave of amplitude and the said audio signal of a plurality of said sub-audio signals;
Amplitude adjusting module; Be used for according to the amplitude of each said preset frequency range adjustment parameter corresponding, storage in advance, the sub-audio signal corresponding and the amplitude of said carrier wave with each said preset frequency range; Each said sub-audio signal is carried out the amplitude adjustment, the nonlinear distortion that produces when directly modulating said audio signal with compensated pulse ladder modulation transmitter;
Signal transmitting module; Be used for a plurality of sub-audio signals through the amplitude adjustment are added up; Form audio signal through the amplitude adjustment; And send to said pulse step modulation transmitter, so that said pulse step modulation transmitter carries out modulate emission to said audio signal through the amplitude adjustment.
The embodiment of the invention also provides a kind of transmitter, comprises the precompensation device of the nonlinear distortion that the embodiment of the invention provides.
The precompensation method of the nonlinear distortion of the embodiment of the invention and device and transmitter; According to preset frequency range audio signal is divided into a plurality of sub-audio signals; The amplitude of the carrier wave of the adjustment parameter of obtaining according to the posivtive spike amplitude-versus-frequency curve by transmitter output then corresponding with a plurality of preset frequency ranges and the amplitude of each sub-audio signal and audio signal is carried out amplitude adjustment to each sub-audio signal, with the adjusted a plurality of sub-audio signals of the amplitude adjusted audio signal of formation amplitude that adds up; Carrying out precompensation with the nonlinear distortion that transmitter is caused handles; Compared with prior art, it realizes simple, and does not need feedback circuit.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply; Obviously, the accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of precompensation method of the nonlinear distortion of the embodiment of the invention one;
The method flow diagram of the generation adjustment parameter that Fig. 2 provides for the embodiment of the invention one;
Fig. 3 is the flow chart of a kind of execution mode of step 13 among Fig. 1;
Fig. 4 is the posivtive spike amplitude-versus-frequency curve that the pulse step modulation transmitter of the not compensated processing of the embodiment of the invention two is exported;
The flow chart of the precompensation method of the nonlinear distortion that Fig. 5 provides for the embodiment of the invention two;
Fig. 6 is the posivtive spike amplitude-versus-frequency curve figure of the pulse step modulation transmitter after compensation deals of the embodiment of the invention two;
Fig. 7 is the oscillogram through the adjusted audio signal of side reaction coefficient of the embodiment of the invention two;
Fig. 8 be the embodiment of the invention two again through the oscillogram of the adjusted audio signal of beta coefficient;
Fig. 9 is the structural representation of precompensation device of the nonlinear distortion of the embodiment of the invention three.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Fig. 1 is the flow chart of precompensation method of the nonlinear distortion of the embodiment of the invention one, and the executive agent of present embodiment is the precompensation device of nonlinear distortion, and is as shown in Figure 1, and the precompensation method of present embodiment comprises:
Step 11 in the audio signal of input, is obtained the sub-audio signal corresponding respectively with a plurality of preset frequency ranges;
Wherein, Audio signal in the input precompensation device is the mixed signal that one kind of multiple frequencies are formed; Be provided with a plurality of filters in the precompensation device; Corresponding with a plurality of preset frequency ranges respectively, be used for the audio signal of input is carried out filtering, to obtain the sub-audio signal corresponding respectively with a plurality of preset frequency ranges.
Step 12 is obtained the amplitude of carrier wave of amplitude and the audio signal of a plurality of sub-audio signals;
Step 13; According to the amplitude of each preset frequency range adjustment parameter corresponding, storage in advance, the sub-audio signal corresponding and the amplitude of carrier wave with each preset frequency range; Each sub-audio signal is carried out amplitude adjustment, the nonlinear distortion that produces during with the direct audio signal modulation of compensated pulse ladder modulation transmitter;
What this concrete step was obtained according to step 12 by the precompensation device adjusts processing with the amplitude of the corresponding respectively sub-audio signal of a plurality of preset frequency ranges with the corresponding adjustment parameter of each the sub-audio signal amplitude of carrying out.Wherein, The adjustment parameter is the required parameter of adjustment sub-audio signal; The adjustment parameter corresponding with the preset frequency range under the sub-audio signal, that the sub-audio signal of different frequency range is corresponding different, adjustment parameter are to be formed and stored in the memory space according to the posivtive spike amplitude-frequency characteristic of pulse step modulation transmitter in advance; Said memory space can be the built-in memory space of precompensation device, also can be external memory space.
Step 14; A plurality of sub-audio signals through the amplitude adjustment are added up; Form audio signal, and send to the pulse step modulation transmitter, so that the pulse step modulation transmitter is to carrying out modulate emission through the audio signal of amplitude adjustment through the amplitude adjustment.
Concrete; Because having carried out the amplitude adjustment, handles step 13 pair each sub-audio signal; Each sub-audio signal of handling through amplitude adjustment added up obtains the audio signal through the amplitude adjustment, then, will pass through the audio signal of amplitude adjustment and send into the pulse step modulation transmitter; Posivtive spike and the negative peak of signal that guarantees the output of pulse step modulation transmitter is in a basic balance, the nonlinear distortion that promptly causes with the amplitude compensated pulse ladder modulation transmitter through the audio signal adjusted.
The precompensation method of the nonlinear distortion that present embodiment provides; Through the amplitude of obtaining the sub-audio signal corresponding and adjustment parameter, sub-audio signal and the amplitude that modulates the carrier wave of audio signal each sub-audio signal is carried out the amplitude adjustment with preset frequency range; A plurality of sub-audio signals that will pass through the amplitude adjustment add up; Accumulation result is sent into the pulse step modulation transmitter, with the nonlinear distortion of usefulness through the amplitude compensated pulse ladder modulation transmitter of the audio signal of adjustment.The precompensation method of present embodiment is different with existing compensation method, does not adopt the nonlinear distortion of feedback system paired pulses ladder modulation transmitter to compensate, and does not need complicated feedback circuit and algorithm, and the method for present embodiment realizes simple.
Further, needs generate the adjustment parameter in advance before preset frequency range adjustment parameter corresponding, storage in advance is carried out the amplitude adjustment to each sub-audio signal according to each, the method flow diagram of the generation adjustment parameter that Fig. 2 provides for the embodiment of the invention one.Present embodiment provides a kind of implementation that generates the adjustment parameter, and the adjustment parameter of present embodiment is to generate according to the posivtive spike amplitude-frequency characteristic of pulse step modulation transmitter, specifically comprises:
It is example that present embodiment is divided into six frequency ranges with the passband with the pulse step modulation transmitter; Be respectively: below the 80Hz, 80Hz～150Hz, 150Hz～1.5kHz, 1.5kHz～2.4kHz, 2.4k～3.2kHz, more than the 3.2kHz; Usually the frequency of shortwave audio signal is 50Hz～5kHz; Therefore, the frequency range of shortwave audio signal is in the scope that above-mentioned each frequency range covered.
This step is used for the corresponding adjustment parameter that generates above-mentioned each frequency range, specifically can obtain the corresponding adjustment parameter of frequency range according to the central point frequency of each frequency range, also can obtain the corresponding adjustment parameter of frequency range according to a plurality of Frequency points in the frequency range; For example can ask the corresponding adjustment parameter of average regeneration to the posivtive spike amplitude-frequency characteristic of a plurality of Frequency points in the frequency range.Because the posivtive spike amplitude-frequency characteristic of pulse step modulation transmitter can embody the nonlinear distortion degree; Therefore; Present embodiment generates the adjustment parameter based on the posivtive spike amplitude-frequency characteristic of pulse step modulation transmitter; And go that with this adjustment parameter each sub-audio signal in the audio signal of input is carried out the amplitude adjustment and handle, can guarantee the accuracy of compensating non-linear distortion.
Generating mode based on above-mentioned adjustment parameter; The acquisition process of the adjustment parameter that step 13 is used in the present embodiment specifically is embodied as: at first according to step 11 audio signal of input is carried out frequency range and divide; Obtain the sub-audio signal corresponding with each preset frequency range; For example can through with the corresponding many groups filter of preset frequency range of the posivtive spike amplitude-frequency characteristic of the pulse step modulation transmitter of being divided; The audio signal of input is divided in the different frequency ranges, and the posivtive spike amplitude-frequency characteristic of corresponding each preset frequency range generates required adjustment parameter then.
Further, present embodiment provides a kind of embodiment of step 13.Fig. 3 is the flow chart of a kind of execution mode of step 13 among Fig. 1, and this execution mode is realized based on technique scheme, specifically comprises:
Step 131, precompensation device are at first calculated the adjusted amplitude of the corresponding sub-audio signal of each preset frequency range according to formula (1);
A
o＝A
i×(A
c+α×A
i)÷A
c×β (1)
Wherein, A
iAmplitude for the sub-audio signal; A
cAmplitude for carrier wave; α, β are the adjustment parameter that generates according to said method, A
oAdjusted amplitude for the sub-audio signal.
Step 132 according to adjusted amplitude, is carried out the amplitude adjustment to each sub-audio signal.
In this step, the precompensation device is adjusted to required amplitude with the amplitude of each sub-audio signal, and guarantees that other information of each sub-audio signal are constant, for example keeps original frequency, phase place etc.So far, having accomplished to the amplitude of each sub-audio signal adjustment handles.Then, in step 14, will pass through each sub-audio signal that amplitude adjustment handles adds up and forms the audio signal through the amplitude adjustment.
For further specifying technical scheme of the present invention, below embodiment be that the modulation of the single audio frequency signal of 1kHz is output as example and describes with the pulse step modulation transmitter to frequency:
Wherein, Fig. 4 is the posivtive spike amplitude-versus-frequency curve of the pulse step modulation transmitter output handled of the not compensated of the embodiment of the invention two.The flow chart of the precompensation method of the nonlinear distortion that Fig. 5 provides for the embodiment of the invention two.Fig. 6 is the posivtive spike amplitude-versus-frequency curve figure of the pulse step modulation transmitter after compensation deals of the embodiment of the invention two; Fig. 7 is the oscillogram through the adjusted audio signal of side reaction coefficient of the embodiment of the invention two; Fig. 8 is the oscillogram through the adjusted audio signal of beta coefficient of the embodiment of the invention two.
It is asymmetric that the nonlinear distortion of pulse step modulation transmitter is mainly reflected in the positive negative peak of modulated signal of modulating output, because the linearity of the low more transmitter of voltage is good more, therefore, is benchmark with the negative peak modulation degree.For example when the negative peak modulation degree is 90%, know that the modulation degree of posivtive spike also is not equal to or near 90%, but reduces along with the increase of frequency by shown in Figure 4.And can be known by Fig. 4, be 90% o'clock in the modulation degree of negative peak, frequency be the posivtive spike modulation degree of audio signal of 1kHz about 87%, present embodiment is an example with 87%.In order to overcome the nonlinear distortion of pulse step modulation transmitter; At first adopting technical scheme of the present invention is that the audio signal of 1kHz is carried out the amplitude processing and amplifying to frequency; Send into then and carry out modulate emission in the pulse step modulation transmitter; The handling process that concrete amplitude is amplified is as shown in Figure 5, may further comprise the steps:
The mode that present embodiment adopts the foregoing description to provide generates the adjustment parameter, to guarantee the accuracy of compensating non-linear distortion.The practical implementation process is: at first according to posivtive spike amplitude-versus-frequency curve shown in Figure 4; Know that frequency is that the modulation degree of posivtive spike of the audio signal of 1kHz is 87%; Than desirable modulation degree 90% low 3%, be increased to 93% based on this modulation degree, i.e. Ao=0.93A with posivtive spike
c, the modulation degree of negative peak is 90%, i.e. Ao=0.90A
c, and bring formula (1) respectively into, obtain formula (2) and formula (3), as follows:
0.93A
c＝0.90A
c×(A
c+0.90αA
c)÷A
c×β (2)
-0.90A
c＝-0.90A
c×(A
c+(-0.90αA
c))÷A
c×β (3)
Abbreviation and finding the solution obtains:
α＝0.0182；β＝1.017；
Based on the above-mentioned adjustment parameter of finding the solution, be that the audio signal of the 1kHz amplitude of carrying out is amplified back modulation output to frequency according to formula (1).Above-mentioned output result is done further analysis, find that the modulation degree of posivtive spike is still undesirable, then continue near the modulation degree of adjustment posivtive spike 93%.Through repeatedly adjustment and test, find when the modulation degree of posivtive spike 93.3% the time, the modulation degree of the posivtive spike of pulse modulated demodulation transmitter output is comparatively desirable, then calculates adjustment parameter, soon Ao=0.933A according to this modulation degree
c, Ao=0.90A
cBring formula (1) respectively into and obtain formula (4) and formula (5), as follows:
0.933A
c＝0.90A
c×(A
c+0.90αA
c)÷A
c×β (4)
-0.90A
c＝-0.90A
c×(A
c+(-0.90αA
c))÷A
c×β (5)
Abbreviation also calculates:
α＝0.02；β＝1.01833；
According to value and the formula (1) of above-mentioned adjustment parameter alpha, β, be that the audio signal of the 1kHz amplitude of carrying out is amplified to frequency, and the value of storage adjustment parameter alpha, β.Can obtain the corresponding adjustment parameter of each preset frequency range in the passband of pulse step modulation transmitter according to said method, and then know that the pulse step modulation transmitter connects the posivtive spike amplitude-frequency characteristic of output, as shown in Figure 6.
Technique scheme has specifically been introduced the process that how generates the adjustment parameter according to the posivtive spike amplitude-frequency characteristic of pulse step modulation transmitter; The operation that step 51 is described is carried out before other steps in the present embodiment; For example can carry out in advance according to concrete pulse step modulation transmitter; And will generate many groups adjustment parameters store in the memory space in advance, so that when amplitude that each the sub-audio signal in the audio signal is carried out is amplified, can directly call corresponding adjustment parameter; After also can execution of step 51, and then carry out subsequent step.
Concrete, because this audio signal of hypothesis is the signal of single known frequency, therefore, directly know the frequency range at 1kHz place, promptly frequency range 150Hz～1.5kHz obtains i.e. the adjustment parameter and α=0.02 of this frequency range then; β=1.01833 are the adjustment parameter of the audio signal of 1kHz as frequency;
A
o＝A
i×(A
c+α×A
i)÷A
c (6)
Calculate the modulation degree of posivtive spike according to formula (6):
A
o/A
c＝(0.90A
c×(A
c+0.02×0.90A
c)÷A
c)/A
c＝0.9162；
Calculate the modulation degree of negative peak according to formula (6):
A
o/A
c＝((-0.90A
c)×(A
c+0.02×(-0.90A
c))÷A
c)/A
c＝-0.8838；
Can find out that through behind the formula (6), positive negative peak has all to the forward improved, and obtains waveform as shown in Figure 7, wherein abscissa is the time, and ordinate is the amplitude through the adjusted audio signal of side reaction coefficient.Dotted line is the waveform of input audio signal among Fig. 7, and solid line is the waveform behind the peak compensation.Waveform after the above-mentioned processing does not reach the effect that we want, and therefore need do further processing.
Calculate the modulation degree of posivtive spike according to formula (1):
A
o/A
c＝0.9162×β＝0.9162×1.01833＝0.933；
Calculate the modulation degree of negative peak according to formula (6):
A
o/A
c＝0.8838×β＝-0.8838×1.01833＝0.90；
Can find out through formula (1) back posivtive spike and improve in advance that obtain waveform as shown in Figure 8, wherein abscissa is the time, ordinate is the amplitude through the adjusted audio signal of beta coefficient.Dotted line is the waveform of input audio signal among the figure, and solid line is the waveform after the posivtive spike compensation.
Improve the peak value of posivtive spike in advance the asymmetric nonlinear distortion of positive negative peak that power amplifier that can compensation transmitter brings through above-mentioned steps.
Technical scheme simple possible of the present invention; For further specifying the technique effect of technical scheme of the present invention; The inventor is that the negative peak 90% of 11.665MHz audio signal is modulated to example and has carried out lot of test with the carrier frequency; Wherein table 1 is the distortion factor of posivtive spike under the compensating distortion degree situation not, and table 2 is the distortion factor of posivtive spike under the distortion factor situation of compensation back.
Table 1
| Carrier frequency | Frequency (Hz) | 100 | 200 | 400 | 800 | 1K | 2K | 5K |
| 11.665MHz | The distortion factor (%) | 2.08 | 1.77 | 1.88 | 1.66 | 1.80 | 2.40 | 3.92 |
Table 2
| Carrier frequency | Frequency (Hz) | 100 | 200 | 400 | 800 | 1K | 2K | 5K |
| 11.665MHz | The distortion factor (%) | 1.07 | 0.90 | 1.14 | 1.09 | 0.80 | 1.47 | 1.04 |
From data, can find out; In the distortion factor that audio signal is not compensated transmitter under the situation between 1.5～4%; The distortion factor of transmitter is about 1% under audio signal process compensation adjustment situation, and above-mentioned test data has further been verified the technique effect of technical scheme of the present invention.
Fig. 9 is the structural representation of precompensation device of the nonlinear distortion of the embodiment of the invention three, and the precompensation device of present embodiment can be arranged in the pulse step modulation transmitter, also can independently be provided with and is connected with the pulse step modulation transmitter.As shown in Figure 9, the precompensation device of present embodiment comprises: sub-audio signal acquisition module 91, amplitude acquisition module 92, amplitude adjusting module 93, signal transmitting module 94 and memory module 97.
Wherein, sub-audio signal acquisition module 91 is used for the audio signal in input, obtains the sub-audio signal corresponding with a plurality of preset frequency ranges, and for example sub-audio signal acquisition module 91 can be made up of a plurality of filters, and each filter is corresponding with a preset frequency range.Amplitude acquisition module 92 is connected with sub-audio signal acquisition module 91, is used to obtain the amplitude of carrier wave of amplitude and the audio signal of a plurality of sub-audio signals; The carrier wave that wherein is modulated into each sub-audio signal is identical, so the amplitude of carrier wave is same.
Signal transmitting module 94 is connected with amplitude adjusting module 93; Be used for a plurality of sub-audio signals through the amplitude adjustment are added up; Form audio signal through the amplitude adjustment; And send to the pulse step modulation transmitter, so that the pulse step modulation transmitter carries out modulate emission to the audio signal of amplifying through amplitude.
The precompensation device of the nonlinear distortion of present embodiment; Obtain each sub-audio signal and adjustment parameter in each preset frequency range corresponding audio signal; And according to the amplitude of sub-audio signal, adjust parameter and be modulated into the amplitude of the carrier wave of audio signal, each sub-audio signal is carried out the amplitude adjustment, each sub-audio signal that will pass through the amplitude adjustment adds up; And accumulation result is sent to the pulse step modulation transmitter by the pulse step modulation transmitter the adjusted audio signal of amplitude is carried out modulate emission then; Thereby the nonlinear distortion that produces when compensating direct modulate emission audio signal compared with prior art, does not comprise complicated feedback circuit in the precompensation device of present embodiment; When implementing, do not need complicated feedback algorithm yet, can simply realize compensation the nonlinear distortion of transmitter.
Concrete, the amplitude adjusting module 93 in the present embodiment comprises amplitude computing unit 931 and amplitude adjustment unit 932.Amplitude computing unit 931 is used for according to formula A
o=A
i* (A
c+ α * A
i) ÷ A
c* β calculates adjusted amplitude; Amplitude adjustment unit 932 is used for the amplitude that should adjust to that calculates according to amplitude computing unit 931, corresponding sub-audio signal is carried out the amplitude adjustment handle, and adjusted each the sub-audio signal of amplitude is offered signal transmitting module 94.Concrete, amplitude adjustment unit 932 is adjusted to the amplitude that amplitude computing unit 931 calculates with the amplitude of each sub-audio signal, and guarantees that other information of each sub-audio signal are constant, for example keeps original frequency, phase place etc.So far, having accomplished to the amplitude of each sub-audio signal adjustment handles.
Further, the precompensation device of present embodiment also comprises: frequency range is divided module 95 and adjustment parameter generation module 96.Frequency range is divided module 95 and is used for according to a plurality of preset frequency ranges the posivtive spike amplitude-frequency characteristic of pulse step modulation transmitter being divided; Adjustment parameter generation module 96 is used for according to the posivtive spike amplitude-frequency characteristic in each preset frequency range, generates the corresponding adjustment parameter of each preset frequency range.These two modules are used for generating in advance the adjustment parameter, and the adjustment parameter that will generate in advance stores in the memory module 97, and the amplitude adjustment is required for each the sub-audio signal in the audio signal is carried out.
The adjustment parameter of each frequency range correspondence generates according to the posivtive spike amplitude-frequency characteristic of pulse step modulation transmitter in the present embodiment, specifically can obtain the corresponding adjustment parameter of frequency range according to the central point frequency of each frequency range; Also can ask on average as the corresponding adjustment parameter of frequency range according to the adjustment parameter that a plurality of Frequency points are obtained.Because the posivtive spike amplitude-frequency characteristic of pulse step modulation transmitter can embody the nonlinear distortion degree, therefore audio signal is carried out the amplitude adjustment and handle based on the adjustment parameter that generates according to the posivtive spike amplitude-frequency characteristic, can guarantee the accuracy of compensating non-linear distortion.
Based on technique scheme; The precompensation device of present embodiment at first obtains in the audio signal of input each sub-audio signal corresponding to preset frequency range through sub-audio signal acquisition module 91; Obtain then by adjustment parameter generation module 96 adjustment parameters that generate, corresponding with each preset frequency range; This is adjusted parameter as the required adjustment parameter of each sub-audio signal of adjustment; Realization to the amplitude of each sub-audio signal adjustment handle, and then realize the amplitude adjustment of audio signal is handled, with the nonlinear distortion of the amplitude compensated pulse modulation transmitter of the audio signal after the adjustment processing.
The embodiment of the invention three provides a kind of transmitter, and the transmitter of present embodiment comprises the precompensation device of the nonlinear distortion that the foregoing description provides, and wherein transmitter also comprises emitter.Transmitter is used for the precompensation device carries out amplitude adjustment to audio signal according to the posivtive spike amplitude-frequency characteristic of transmitter emitter after, through emitter to modulating through the adjusted audio signal of amplitude and launching.
The transmitter of present embodiment comprises the precompensation device of the nonlinear distortion that the foregoing description provides; Through in advance audio signal being carried out the amplitude adjustment; Nonlinear distortion to emitter causes is carried out precompensation; Compensated the nonlinear distortion that existing transmitter exists when the modulate emission audio signal, improved precision the audio signal modulate emission.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (7)
1. the precompensation method of a nonlinear distortion is characterized in that, comprising:
In the audio signal of input, obtain the sub-audio signal corresponding respectively with a plurality of preset frequency ranges;
Obtain the amplitude of carrier wave of amplitude and the said audio signal of a plurality of said sub-audio signals;
According to the amplitude of each said preset frequency range adjustment parameter corresponding, storage in advance, the sub-audio signal corresponding and the amplitude of said carrier wave with each said preset frequency range; Each said sub-audio signal is carried out the amplitude adjustment, the nonlinear distortion that produces when directly modulating said audio signal with compensated pulse ladder modulation transmitter;
A plurality of sub-audio signals through the amplitude adjustment are added up; Form audio signal through the amplitude adjustment; And send to said pulse step modulation transmitter, so that said pulse step modulation transmitter carries out modulate emission to said audio signal through the amplitude adjustment.
2. the precompensation method of nonlinear distortion according to claim 1 is characterized in that, according to each preset frequency range adjustment parameter corresponding, storage in advance each said sub-audio signal is carried out also comprise before the amplitude adjustment:
According to a plurality of said preset frequency ranges the posivtive spike amplitude-frequency characteristic of said pulse step modulation transmitter is divided;
According to the posivtive spike amplitude-frequency characteristic in each said preset frequency range, generate the corresponding adjustment parameter of each said preset frequency range.
3. the precompensation method of nonlinear distortion according to claim 1 and 2; It is characterized in that; According to the amplitude of each said preset frequency range adjustment parameter corresponding, storage in advance, the sub-audio signal corresponding and the amplitude of said carrier wave, each said sub-audio signal is carried out amplitude adjustment is specially with each said preset frequency range:
According to formula A
o=A
i* (A
c+ α * A
i) ÷ A
c* β calculates adjusted amplitude;
According to adjusted amplitude, each said sub-audio signal is carried out the amplitude adjustment;
Wherein, A
iAmplitude for said sub-audio signal;
A
cAmplitude for said carrier wave;
α, β are said adjustment parameter;
A
oBe adjusted amplitude.
4. the precompensation device of a nonlinear distortion is characterized in that, comprising:
The sub-audio signal acquisition module is used for the audio signal in input, obtains the sub-audio signal corresponding with a plurality of preset frequency ranges;
The amplitude acquisition module is used to obtain the amplitude of carrier wave of amplitude and the said audio signal of a plurality of said sub-audio signals;
Amplitude adjusting module; Be used for according to the amplitude of each said preset frequency range adjustment parameter corresponding, storage in advance, the sub-audio signal corresponding and the amplitude of said carrier wave with each said preset frequency range; Each said sub-audio signal is carried out the amplitude adjustment, the nonlinear distortion that produces when directly modulating said audio signal with compensated pulse ladder modulation transmitter;
Signal transmitting module; Be used for a plurality of sub-audio signals through the amplitude adjustment are added up; Form audio signal through the amplitude adjustment; And send to said pulse step modulation transmitter, so that said pulse step modulation transmitter carries out modulate emission to said audio signal through the amplitude adjustment.
5. the precompensation device of nonlinear distortion according to claim 4 is characterized in that, also comprises:
Frequency range is divided module, is used for a plurality of said preset frequency ranges the posivtive spike amplitude-frequency characteristic of said pulse step modulation transmitter is divided;
Adjustment parameter generation module is used for according to the posivtive spike amplitude-frequency characteristic in each said preset frequency range, generates the corresponding adjustment parameter of each said preset frequency range.
6. according to the precompensation device of claim 4 or 5 described nonlinear distortions, it is characterized in that said amplitude adjusting module comprises:
The amplitude computing unit is used for according to formula A
o=A
i* (A
c+ α * A
i) ÷ A
c* β calculates adjusted amplitude;
Amplitude adjustment unit is used for according to adjusted amplitude, and said sub-audio signal is carried out the amplitude adjustment;
Wherein, A
iAmplitude for said sub-audio signal;
A
cAmplitude for said carrier wave;
α, β are said adjustment parameter;
A
oBe adjusted amplitude.
7. a transmitter is characterized in that, comprises the precompensation device like each described nonlinear distortion of claim 4-6.
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| CN113395127B (en) * | 2021-07-13 | 2022-03-18 | 伟乐视讯科技股份有限公司 | Emergency broadcast RDS modulation degree test method and system |
| CN117134783B (en) * | 2023-10-27 | 2024-01-30 | 高拓讯达(北京)微电子股份有限公司 | Pre-compensation method and device for transmitter signal, electronic equipment and storage medium |
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| CN101057406A (en) * | 2004-09-14 | 2007-10-17 | 皇家飞利浦电子股份有限公司 | Arrangement for pulse-width modulating an input signal |
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