CN105656580A - Digital power dynamic access method based on DRM+ - Google Patents
Digital power dynamic access method based on DRM+ Download PDFInfo
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- CN105656580A CN105656580A CN201511032368.7A CN201511032368A CN105656580A CN 105656580 A CN105656580 A CN 105656580A CN 201511032368 A CN201511032368 A CN 201511032368A CN 105656580 A CN105656580 A CN 105656580A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/42—Arrangements for resource management
- H04H20/423—Transmitter side
Abstract
The invention discloses a digital power dynamic access method based on DRM+, comprising the following steps of 1, generating an analog FM frequency modulated signal; 2 , obtaining the transmission power of a digital signal by using a digital power dynamic access algorithm according to the real-time spectrum distribution of the analog FM signal; and 3, according to the transmission power obtained by the algorithm, adjusting the transmission parameter of a DRM+ signal in real time and sending to a DRM+ exciter, and finally sending out the self-adapting digital signal. According to the digital power dynamic access method, through adding a self-adaptive adjusting module between the analog FM signal and the DRM+ signal, the transmission power of the digital signal is dynamically adjusted according to the real-time distribution of the analog signal, thus the listening quality of the digital user can be improved under the premise of ensuring that the listening quality of the analog user is not reduced.
Description
Technical field
The present invention relates to broadcast television transmitting, digitization of broadcasting field, particularly relate to a kind of digital power dynamic access method based on DRM+.
Background technology
Digitization of broadcasting is the hot issue of technical study both at home and abroad at present, and China's numeral sound broadcast is also in the research stage. Different digit broadcasting systems has different work frequency ranges and radio frequency bandwidth, and in the transitional period changed by simulation-to-digital, present analog broadcasting and other radio service should do not produced interference by digital display circuit. Interval that the is bandwidth Design of DRM+ system and present analog channel is identical, if available free frequency spectrum, just can insert digital channel at any time, both existing analog broadcasting can not have been disturbed, it is convenient to again digital channel and replaces analog channel one by one, it is convenient to realize tallying with the national condition by " soft " transition of simulation-to-digital.
DRM is the digital transmission system working in long medium short wave (150kHz��30MHz), recommended by ITU-R (ITURadiocommunicationSector), and by IEC (InternationalElectrotechnicalCommission) and ETSI (EuropeanTelecommunicationsStandardsInstitute) stdn, obtain successfully in world's scope. In March, 2005, DRM standard is expanded to the scope of 120MHz by DRM organization decided, comprise 47��68MHz (wave band I, Eastern Europe FM wave band), the 87.5��108MHz (wave band II) of 65.8��74MHz (world's broadcast television tissue, FM wave band), 76��90MHz (Japan FM wave band) and the use of world's most countries FM broadcast. DRM+ is not the replacement person of DRM, but the expansion of DRM standard. DRM+ is independent digital transmission system, promises to be FM wave band analog broadcasting replacement person in the future most.
DRM+ uses the bandwidth of 100kHz, and existing FM broadcast channel interval is consistent. The frequency gap that it can make full use of existing simulation FM broadcast carries out numeral broadcast, as shown in Figure 1. DRM+ can transmit the data rate (16QAM modulation) of the most nearly 186kb/s.
DRM+ has many advantages, as program can be made to reach CD quality; There are indoor reception and the possibility with the speed mobile reception of 300km/h; There is the possibility using existing FM broadcast transmission anastomose structure; There is the ability etc. forming synchronized transmissions net.
But, owing to the frequency spectrum bandwidth of FM simulating signal changes along with program signal (such as frequency, power), and the spectrum position of numerary signal, power size etc. immobilize, the Different periods audio frequency mass difference causing people's ear to be heard is very big, and the dynamic access that this is DRM+ digital power provides chance.
DRM+ signal according to simulation FM signal spectrum distribution dynamic conditioning power time, unavoidably need discuss a problem namely: the power of dynamic assignment numerary signal whether can worsen simulation user listening quality. For the evaluation of listening quality, conventional examination criteria is all utilize signal to noise ratio. What signal to noise ratio was weighed is the total noise power in whole frequency band, but different for the sensitivity of noise at different frequency band people's ears. In order to reflect the sensation of people's ear listening to audio better, this patent adopts PEAQ (PerceptualEvaluationofAudioQuality) psychoacoustic model as examination criteria.
The PEAQ algorithm that this patent uses is a kind of objective examination method based on audio sensing technology that ITU (InternationalTelecommunicationsUnion) proposes. It is based on psychoacoustic model, simulates, from people's ear, sound is produced the whole process of response to final perception, is that algorithm block diagram is as shown in Figure 2 at present for algorithm the highest with the subjective evaluation result degree of correlation in audio frequency Objective Quality Assessment algorithm.
PEAQ algorithm is by imitating the auditory system of people's ear, signal is carried out analyzing with comprehensive by Reference Signal and test signal respectively through the sensor model based on FFT, comprise time-frequency conversion, frequency band grouping, noise masking ratio (M.R.) (NoiseMaskingRatio, NMR) step such as calculating, it is intended that the better sensorial characteristics of simulation people's ear; Excitation sample preprocessing module is by compensating the loudness differences of reference signal and test signal and linear distortion, thus the data that computation model output parameter (ModelOutputVariables, MOV) is front are carried out accommodation; Pretreated data calculate 11 MOV values by characteristic synthetic. Finally, by neural network module, these MOV parameters are mapped as an objective difference grade (ObjectiveDifferenceGrade, ODG) value exports, and this definition is equal to subjective differences grade (SubjectiveDifferenceGrade, SDG) in subjective assessment.
For the limit of error of PEAQ algorithm, ITU standard is pointed out, the grade result of ODG can think that within �� 0.02 audio frequency quality is identical.
Summary of the invention
The technical problem existed to overcome in prior art, the present invention increases numerary signal and simulating signal self-adaptative adjustment module in systems in which, process of simulation FM signal and DRM+ combined signal being got up. By detecting the spectrum distribution of analog fm signal in real time, by the information feed back of current simulating signal to digital signal processing module, so that DRM+ signal carries out self-adaptive step random search method, ensureing under the prerequisite that simulation user's listening quality does not decline, it is possible to improve the listening quality of numeral user.
The present invention intends the digital power dynamic access method based on DRM+ determined, as shown in Figure 3, comprises the following steps: step S1, generates simulation FM frequency modulation signal; Step S2, according to the spectrum distribution that simulation FM signal is real-time, adopts digital power dynamic access algorithm to obtain the through-put power of numerary signal; And step S3, according to the through-put power that algorithm obtains, the transmission parameter of adjustment DRM+ signal in real time, and pass to DRM+ stimulator, the numerary signal of self-adaptation sends the most at last.
Wherein said step S2 digital power dynamic access algorithm block diagram as shown in Figure 4, specifically, comprises the following steps:
The first step, the NMR of calculating simulation sound signalrefValue, wherein NMRrefRepresent that time span is the noise masking ratio (M.R.) of the simulated audio signal of T second;
2nd step, the ODG of calculating simulation sound signalrefValue, wherein ODGrefRepresent that time span is the objective difference grade of the simulated audio signal of T second;
3rd step, setting initial value, i=1, p=-5, wherein i is frame count, and p represents that the power of DRM+ signal is pdB, and namely the power of DRM+ signal is the pdB of simulated audio signal power;
4th step, calculates NMRI, p, 1��i��N ,-15��p��-5 are worth, and wherein N is total frame number of reference signal, NMRI, pThe power representing the i-th frame and DRM+ signal is noise masking ratio (M.R.) during pdB;
5th step, for the i-th frame signal, finds and meets NMRI, p-NMRrefDigital power maximum value corresponding during��0 condition, and this value is stored in register Poweri, in 1��i��N, method for searching is: when not meeting NMRI, p-NMRrefWhen��0, p=p-1, and perform the 4th step; Otherwise i=i+1, p=-5, and perform the 4th step;
6th step, according to Poweri, i=1,2 ... N is determined the power of every frame DRM+ signal, regenerates the DRM+ signal that time span is the T second, calculates the objective difference grade ODG of now simulated audio signalnew;
7th step, judges that whether the analogue audio frequency quality after dynamic conditioning is qualified, and determination methods is: when not meeting | ODGnew-ODGref| when��0.02, audio frequency is off quality, makes Poweri=Poweri-1, i=1,2 ... N, and return the 7th step; Otherwise audio frequency is up-to-standard, now Poweri, i=1,2 ... namely the value of N is the access power of the DRM+ signal dynamics adopting digital power dynamic access algorithm to obtain.
NMR in the wherein said the first steprefWith ODG in the 2nd steprefMethod of calculation be: the model setting up FM modulation /demodulation according to FM broadcast standard, DRM+ launching system is set up according to DRM+ standard, wherein the spectrum position of numerary signal is distance FM signal carrier wave 100kHz to 200kHz, the power of numerary signal is-10dB, and namely the power of DRM+ signal is the-10dB of simulated audio signal power; The original analog audio signal taking time span as the T second is as with reference to signal, using the simulating signal after receiving end demodulation as test signal, Reference Signal and test signal send into PEAQ model respectively, obtain NMRrefAnd ODGref��
NMR in wherein said 4th stepI, pMethod of calculation be: the model setting up FM modulation /demodulation according to FM broadcast standard, set up DRM+ launching system according to DRM+ standard, the power of numerary signal is p; Using the i-th frame time span as the original analog audio signal of T/N second is as with reference to signal, using the simulating signal after receiving end demodulation as test signal, Reference Signal and test signal send into PEAQ model respectively, obtain NMRI, p��
ODG in wherein said 6th stepnewMethod of calculation be: the model setting up FM modulation /demodulation according to FM broadcast standard, set up DRM+ launching system according to DRM+ standard, wherein the power of the i-th frame of digital signal is Poweri, i=1,2 ... N; The original analog audio signal taking time span as the T second is as with reference to signal, using the simulating signal after receiving end demodulation as test signal, Reference Signal and test signal send into PEAQ model respectively, obtain ODGnew��
Advantage and method about the present invention are further understood by detailed description and accompanying drawings below.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the part of the application, and the schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the frequency spectrum figure of DRM+ and FM broadcast;
Fig. 2 is PEAQ psychoacoustic model algorithm block diagram;
Fig. 3 is the digital power dynamic access method block diagram based on DRM+ that the present invention drafts;
Fig. 4 is digital power dynamic access algorithm steps.
Embodiment
Below to the better embodiment of the present invention being elaborated by reference to the accompanying drawings, so that advantages and features of the invention can be easier to be readily appreciated by one skilled in the art, thus protection scope of the present invention is made more explicit defining.
The present invention intends the digital power dynamic access method based on DRM+ determined, comprises the following steps: step S1, generates simulation FM frequency modulation signal; Step S2, according to the spectrum distribution that simulation FM signal is real-time, adopts digital power dynamic access algorithm to obtain the through-put power of numerary signal; And step S3, according to the through-put power that algorithm obtains, the transmission parameter of adjustment DRM+ signal in real time, and pass to DRM+ stimulator, the numerary signal of self-adaptation sends the most at last.
Wherein said step S2 digital power dynamic access algorithm block diagram as shown in Figure 4, specifically, comprises the following steps:
The first step, the NMR of calculating simulation sound signalrefValue, method of calculation are: the model setting up FM modulation /demodulation according to FM broadcast standard, DRM+ launching system is set up according to DRM+ standard, wherein the spectrum position of numerary signal is distance FM signal carrier wave 100kHz to 200kHz, the power of numerary signal is-10dB, and namely the power of DRM+ signal is the-10dB of simulated audio signal power; The original analog audio signal taking time span as the T second is as with reference to signal, using the simulating signal after receiving end demodulation as test signal, Reference Signal and test signal send into PEAQ model respectively, obtain the noise masking ratio (M.R.) NMR that time span is the simulated audio signal of T secondref��
2nd step, the ODG of calculating simulation sound signalrefValue, method of calculation are: the model setting up FM modulation /demodulation according to FM broadcast standard, DRM+ launching system is set up according to DRM+ standard, wherein the spectrum position of numerary signal is distance FM signal carrier wave 100kHz to 200kHz, the power of numerary signal is-10dB, and namely the power of DRM+ signal is the-10dB of simulated audio signal power; The original analog audio signal taking time span as the T second is as with reference to signal, using the simulating signal after receiving end demodulation as test signal, Reference Signal and test signal send into PEAQ model respectively, obtain the objective difference grade ODG that time span is the simulated audio signal of T secondref��
3rd step, setting initial value, i=1, p=-5, wherein i is frame count, and p represents that the power of DRM+ signal is pdB, and namely the power of DRM+ signal is the pdB of simulated audio signal power.
4th step, calculates NMRI, p, 1��i��N ,-15��p��-5 are worth, and wherein N is total frame number of reference signal, NMRI, pThe power representing the i-th frame and DRM+ signal is noise masking ratio (M.R.) during pdB, and method of calculation are: the model setting up FM modulation /demodulation according to FM broadcast standard, set up DRM+ launching system according to DRM+ standard, and the power of numerary signal is p; Using the i-th frame time span as the original analog audio signal of T/N second is as with reference to signal, using the simulating signal after receiving end demodulation as test signal, Reference Signal and test signal send into PEAQ model respectively, obtain NMRI, p��
5th step, for the i-th frame signal, finds and meets NMRI, p-NMRrefDigital power maximum value corresponding during��0 condition, and this value is stored in register Poweri, in 1��i��N, method for searching is: when not meeting NMRI, p-NMRrefWhen��0, p=p-1, and perform the 4th step;Otherwise i=i+1, p=-5, and perform the 4th step.
6th step, according to Poweri, i=1,2 ... N is determined the power of every frame DRM+ signal, regenerates the DRM+ signal that time span is the T second, calculates the objective difference grade ODG of now simulated audio signalnew, method of calculation are: the model setting up FM modulation /demodulation according to FM broadcast standard, set up DRM+ launching system according to DRM+ standard, and wherein the power of the i-th frame of digital signal is Poweri, i=1,2 ... N; The original analog audio signal taking time span as the T second is as with reference to signal, using the simulating signal after receiving end demodulation as test signal, Reference Signal and test signal send into PEAQ model respectively, obtain ODGnew��
7th step, judges that the power of every frame DRM+ signal is according to Poweri, i=1,2 ... whether the analogue audio frequency quality after N dynamic conditioning is qualified, and determination methods is: when not meeting | ODGnew-ODGref| when��0.02, audio frequency is off quality, makes Poweri=Poweri-1, i=1,2 ... N, and return the 7th step; Otherwise audio frequency is up-to-standard, now Poweri, i=1,2 ... namely the value of N is the access power of the DRM+ signal dynamics adopting digital power dynamic access algorithm to obtain.
The above; it is only one of the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; any those of ordinary skill in the art are in the technical scope disclosed by the present invention; the change can expected without creative work or replacement, all should be encompassed within protection scope of the present invention. Therefore, protection scope of the present invention should be as the criterion with the protection domain that claim book limits.
Claims (5)
1. the digital power dynamic access method based on DRM+, it is characterised in that, comprise the following steps:
Step S1, generates simulation FM frequency modulation signal;
Step S2, according to the spectrum distribution that simulation FM signal is real-time, adopts digital power dynamic access algorithm to obtain the through-put power of numerary signal;
Step S3, according to the through-put power that algorithm obtains, the transmission parameter of adjustment DRM+ signal in real time, and pass to DRM+ stimulator, the numerary signal of self-adaptation sends the most at last.
2. method according to claim 1, it is characterised in that, described step S2 digital power dynamic access algorithm comprises the following steps:
The first step, the NMR of calculating simulation sound signalrefValue, wherein NMRrefRepresent that time span is the noise masking ratio (M.R.) of the simulated audio signal of T second;
2nd step, the ODG of calculating simulation sound signalrefValue, wherein ODGrefRepresent that time span is the objective difference grade of the simulated audio signal of T second;
3rd step, setting initial value, i=1, p=-5, wherein i is frame count, and p represents that the power of DRM+ signal is pdB;
4th step, calculates NMRI, p, 1��i��N, the value of-15��p��-5, wherein N is total frame number of reference signal, NMRI, pThe power representing the i-th frame and DRM+ signal is noise masking ratio (M.R.) during pdB;
5th step, for the i-th frame signal, finds and meets NMRI, p-NMRrefDigital power maximum value corresponding during��0 condition, and this value is stored in register Poweri, in 1��i��N, method for searching is: when not meeting NMRI, p-NMRrefWhen��0, p=p-1, and perform the 4th step; Otherwise i=i+1, p=-5, and perform the 4th step;
6th step, according to Poweri, i=1,2 ... N is determined the power of every frame DRM+ signal, regenerates the DRM+ signal that time span is the T second, calculates the objective difference grade ODG of now simulated audio signalnew;
7th step, judges that whether the analogue audio frequency quality after dynamic conditioning is qualified, and determination methods is: when not meeting | ODGnew-ODGref| when��0.02, audio frequency is off quality, makes Poweri=Poweri-1, i=1,2 ... N, and return the 7th step; Otherwise audio frequency is up-to-standard, now Poweri, i=1,2 ... namely the value of N is the access power of the DRM+ signal dynamics adopting digital power dynamic access algorithm to obtain.
3. method according to claim 2, it is characterised in that, NMR in the described the first steprefWith ODG in the 2nd steprefMethod of calculation be: the model setting up FM modulation /demodulation according to FM broadcast standard, set up DRM+ launching system according to DRM+ standard, wherein the spectrum position of numerary signal is distance FM signal carrier wave 100kHz to 200kHz, and the power of numerary signal is-10dB; The original analog audio signal taking time span as the T second is as with reference to signal, using the simulating signal after receiving end demodulation as test signal, Reference Signal and test signal send into PEAQ model respectively, obtain NMRrefAnd ODGref��
4. method according to claim 2, it is characterised in that, NMR in described 4th stepI, pMethod of calculation be: the model setting up FM modulation /demodulation according to FM broadcast standard, set up DRM+ launching system according to DRM+ standard, the power of numerary signal is p; Using the i-th frame time span as the original analog audio signal of T/N second is as with reference to signal, using the simulating signal after receiving end demodulation as test signal, Reference Signal and test signal send into PEAQ model respectively, obtain NMRI, p��
5. method according to claim 2, it is characterised in that, ODG in described 6th stepnewMethod of calculation be: the model setting up FM modulation /demodulation according to FM broadcast standard, set up DRM+ launching system according to DRM+ standard, wherein the power of the i-th frame of digital signal is Poweri, i=1,2 ... N; The original analog audio signal taking time span as the T second is as with reference to signal, using the simulating signal after receiving end demodulation as test signal, Reference Signal and test signal send into PEAQ model respectively, obtain ODGnew��
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