CN102142852B - Method and equipment for transmitting digital-analog audio broadcasting - Google Patents
Method and equipment for transmitting digital-analog audio broadcasting Download PDFInfo
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Abstract
The invention discloses a method and equipment for transmitting digital-analog audio broadcasting. In the method, an analog audio broadcasting signal and a digital audio broadcasting signal are synthesized into an analog and digital mixed-signal to share an analog audio broadcasting channel; or the analog audio broadcasting signal and the digital audio broadcasting signal are synthesized into the analog and digital mixed-signal to share the analog audio broadcasting channel, and the digital audio broadcasting signal also uses frequency bands which are adjacent to the shared channel of the analog audio broadcasting signal and the digital audio broadcasting signal. The power of the digital audio broadcasting signal is at least lower than the power 25dBc of the analog audio broadcasting signal. The bandwidth of the shared channel is 180 to 220 kHz. The adjacent frequency bands of the shared channel are the upper sideband and the lower sideband adjacent to the shared channel. The input ends of an analog audio modulation module and an digital audio modulation module are connected to an external audio source or a data source; the output ends are connected to a synthesis module for synthesizing the analog audio broadcasting signal and the digital audio broadcasting signal into the mixed signal; and the mixed signal is amplified by an amplifier and is transmitted by an antenna feedback system. By the method and the equipment, audio resources are saved and the frequency band using modes are flexible and varied.
Description
(1) technical field
The invention belongs to DAB Technology field, specifically, relate to launching technique and the equipment of digital-analog audio frequency broadcast.
(2) background technology
Amplitude modulation (AM) broadcast starts from nineteen twenty, and frequency modulation (FM) broadcast starts from 1940.In China, from the 1950's to the sixties, intermediate waves broadcast develops rapidly, enters the seventies, and FM broadcast emerges rapidly, and the tonequality of broadcast significantly improves, and broadcast technology is widely used.Although along with the fast development of TV, the Internet, mobile radio communication, traditional audio broadcasting had once become time important media method, development speed lags far behind other main mode of transmission, but audio broadcasting has its specific applied environment and demand, it is still very important medium form, and along with the appearance of new technology, the development of audio broadcasting still has a extensive future.
Be accompanied by the tide of global figure, the innovation of audio broadcasting is also embodied in digitlization.Audio broadcasting field has many new digitizing technique schemes to propose.External main system has digital audio broadcasting (DAB, Digital Audio Broadcasting), digital am system (DRM, Digital Radio Mondiale) and in-band on-channel (HD Radio).
DAB is European digital audio broadcast standards, adopt OFDM modulation system, there is High Data Rate (the about 1.5～1.7Mb/s of the clean data transfer rate of main business), the high quality audio of CD level can be provided, the ability that has stronger anti-multipath to disturb and receive under adverse circumstances, transmitting power is little, area coverage is large, the availability of frequency spectrum is high, business forms flexibly, and can utilize direct broadcasting satellite to increase substantially the coverage rate of broadcast, but, DAB is to replace to traditional FM frequency modulation, instead of compatible or supplementary, existing FM can only wait in radio station DAB at its all band (III wave band, L-band) develop into a certain degree, by after original FM broadcast Close All, just can enter FM wave band and carry out digital audio broadcasting, be difficult to realize and seamlessly transit.
The digital audio broadcasting canonical reference Europe DAB standard that China formulates, and started DAB broadcast on Beijing and other places, but frequency range used is not original modulating FM and amplitude modulation AM frequency range, needs to divide frequency range for it in addition, therefore, its popularization has been subject to certain limitation.And expensive because of DAB broadcast receiver, be difficult to obtain user's extensive accreditation, therefore also do not accomplish so far the marketization and industrialization.
DRM system is developed for the Mid and Short Wave Amplitude Modulation digitlization below 30MHz at first, through studying for many years and realizing, DRM is organized in and has submitted to the following digital am of 30MHz to broadcast formal recommendation (ITU-R BS.1514) to ITU April 4 calendar year 2001, and passes.In November, 2004, DRM tissue proposed a suggestion that DRM is expanded to 30MHz to 120MHz frequency range, be DRM+, its target is the expanding system of exploitation and standardization DRM, it is the digitlization standard technique of VHF wave band, make its frequency coverage wave band I, II and III, become from LW wave band to VHF wave band the open international standard technology of (traditional FM broadcasting frequency range).DRM+ and FM frequency modulation with the spectrogram broadcast as shown in Figure 1, the band separation Δ f >=150kHz of DRM+ definition.Difference power Δ P >=20dB.
In-band on-channel (IBOC/HD Radio) system is the novel broadcast system of being developed for FM broadcast and AM medium wave broadcast digital improvement by iBiquity Digital company of the U.S., on November 15th, 2000, this system has obtained the license of International Telecommunication Union (ITU), in October, 2002, U.S. FCC (FCC (Federal Communications Commission)) is defined as the unique standards for digital broadcasting of the U.S..Compare with other digital Audio Broadcasting modes, the advantage of HD Radio system is to realize the smooth transition of analog to digital.But HD Radio system is used the digital signal that is fixed on analog signal two sidebands to transmit, and causes phase mutual interference and the signal covering problem of Digital and analog broadcast.
The traditional FM FM broadcasting of the U.S. is distributed in 88～108MHz, and each channel bandwidth is 200kHz, over one hundred the station channel of approximately can layouting.And IBOC-FM can not substitute on the basis of original FM analog frequency band, increase digital sidebands and be used for transmitting audio frequency or out of Memory, each radio station can take the bandwidth of 400kHz, and the compatible existing FM frequency modulation system of IBOC-FM, does not need to redistribute frequency spectrum.
FM HD Radio is a kind of OFDM (Orthogonal Frequency Division Multiplexing, OFDM) system, and this system has created set of number sideband on conventional FM signal both sides.HD Radio has three kinds of spectrum allocation may patterns: mixed mode, extended hybrid pattern, digital pattern, it is overlapping that a remarkable common ground of these patterns is that simulation FM and digital FM frequency spectrum do not have in same simulation FM channel, exclusively enjoys separately certain channel.
Under mixed mode, the digital sidebands that lower sideband increases respectively about 70kHz on original simulation FM signal is for transmission of digital signals, simulation FM signal spectrum position and shape remain unchanged, and as shown in Figure 2, simulation FM signal both sides are the upper lower sideband of numeral to spectrum allocation may mode.Mixed mode (Hybrid Mode) provides the data transfer rate of 97kbps, comprising the auxiliary data of voice data and the 1kbps of 96kbps, or the voice data of 64kbps and the auxiliary data of 33kbps.
Compare mixed mode, expand to simulation FM signal in the lower digital sidebands of extended hybrid pattern (Extended Hybrid Mode), upper lower sideband respectively has more 28kHz, reduced the bandwidth of simulation FM signal, both frequency spectrums do not share, as shown in Figure 3, simulation FM signal both sides arrow indication is lower sideband in the numeral of expanding to spectrum allocation may mode.Extended hybrid pattern provides the data transfer rate of 147kbps, comprising the auxiliary data of voice data and the 51kbps of 96kbps, or the voice data of 64kbps and the auxiliary data of 83kbps.This pattern is also supported to simulate stereo and radio data system (RDS), in extended hybrid pattern, has reduced the spectrum width of simulation FM signal, makes way for the digital spectrum of expansion, the each 30kHz of upper and lower sideband expansion.
Under digital pattern, as shown in Figure 4, original analog signal is stopped using, and is replaced by digital signal completely, and main digital signal both sides are the upper lower sideband of numeral, in addition lower sideband in the numeral of the expansion of arrow indication.The spectrum allocation may mode of digital pattern does not have analog signal, and 277kbps data transfer rate can be provided, comprising the auxiliary data of voice data and the 181kbps of 96kbps, or the voice data of 64kbps and the auxiliary data of 213kbps.Can find out, the power of the main channel transmission in both sides is more much larger than the channel mediating.
In China, FM audio broadcasting frequency range is defined as at 87～108MHz, and its spectrum allocation may as shown in Figure 5.Domestic FM audio broadcasting mode is by GBT 4311 specifications, and except monophony and stereophonic broadcasting, multi-Channel Acoustic broadcast and frequcny modulation data are broadcasted two classes to have gone back specification.
Multi-Channel Acoustic broadcast refers to outside monophony or stereophonic broadcasting, then on subcarrier, increases by a warbled broadcast program in road.Wherein on 67kHz, modulating subcarrier is called frequency modulation binodal order when monophonic broadcasting, at 30Hz to 15kHz You Yi road main channel signal, the subcarrier frequency FM signal that is 36kHz in 49～85kHz You Yi road bandwidth, frequency spectrum now as shown in Figure 6.
When stereophonic broadcasting 67 or 76kHz on modulating subcarrier be called three-dimensional vocal cords additional program, spectrogram is respectively as shown in Figure 7, Figure 8.
Frequcny modulation data broadcast refers in sending the broadcast of frequency modulation monophone, FM stereophonic broadcast, utilizes the vacant frequency spectrum of FM baseband, broadcasts specific data.These data can be certain identification information, data or image information etc., are referred to as subchannel information.Be called subchannel for the channel that transmits these information.For improving the utilance of subchannel, allow data to compress, pack, allow the transmitting-receiving agreement of establishing one's own system.Subchannel information should be carried out secondary modulation conventionally on subcarrier.The number of subcarrier can be one, also can according to circumstances adopt multiple subcarrier broadcast.
From the above, in existing DAB Technology, the fully digitalization of DAB Technology Need, incompatible existing frequency modulation standard; DRM+ technology is to utilize single-side belt mode to modulate in spectrum allocation may; HD Radio is for the design of U.S. FM frequency spectrum, and the frequency spectrum situation of China is different from the U.S., and meanwhile, the mode underaction of the spectrum arrangement of HD Radio, only supports the above digital modulation mode of lower sideband symmetry, can not be with broadcasting in same channel.
The existing FM broadcasting of China is taking analog signal as main, utilize base band idle frequency spectrum to modulate the mode of additional information although also defined FM broadcasting, but additional digital sidebands smaller bandwidth, is mainly used in transmitting auxiliary data message, and can not be transmitting digitized analog audio information.And between current domestic actual FM frequency, be separated with 100kHz, 200kHz, 300kHz, 500kHz and 600kHz etc., frequency service condition complexity, still has dummy frequencies resource to be underutilized.Existing DAB Technology is inapplicable in China.But be greatly supplementing of frequency-modulation broadcasting by making full use of of FM Digital Realization tuned radio frequency, therefore propose a kind of new digital audio broadcasting method and design corresponding digital audio broadcasting equipment the audio broadcasting that makes China is obtained to a qualitative leap.
(3) summary of the invention
The object of the invention is openly a kind of launching technique of digital-analog audio frequency broadcast, simulated sound broadcast singal and digital Audio Broadcasting signal synthesize a road analog and digital mixed signal, share a simulated sound broadcasting channel, after Hybrid-modulated Signal is amplified, through antenna-feedback system transmitting, obtain the radiofrequency signal of predetermined spectrum pattern.In same frequency range, simulated sound broadcast singal and the stack of digital Audio Broadcasting signal, transmission simultaneously, be conducive to the development of digital Audio Broadcasting, is applicable to China's FM broadcasting frequency and uses complicated present situation.
Another object of the present invention is to design a kind of transmitter of digital-analog audio frequency broadcast according to above-mentioned digital-analog audio frequency broadcast method.
The launching technique of digital-analog audio frequency broadcast of the present invention, comprises the following steps:
I, generation simulated sound broadcast singal;
II, generation digital Audio Broadcasting signal;
III, simulated sound broadcast singal and digital Audio Broadcasting signal are synthesized to a road analog and digital mixed signal share a simulated sound broadcasting channel, or simulated sound broadcast singal and digital Audio Broadcasting signal synthesize a road analog and digital mixed signal and share simulated sound broadcasting channel, a digital Audio Broadcasting signal and also use the contiguous frequency range of the two share channel;
After IV, mixed signal are amplified, through antenna-feedback system transmitting, obtain the radiofrequency signal of predetermined spectrum pattern.
For fear of the shared simulated sound broadcast singal of a simulated sound broadcasting channel and the phase mutual interference of digital Audio Broadcasting signal, above-mentioned steps III is on shared channel, and the power of digital Audio Broadcasting signal is at least lower than simulated sound broadcast singal power 25dBc.Thereby ensure that digital Audio Broadcasting signal is enough little to the interference of simulated sound broadcast singal, receiving terminal adopts LDPC error correcting code, can obtain respectively digital Audio Broadcasting signal and the simulated sound broadcast singal on same channel with FM cancellation technology and noise estimation technique.
The launching technique of above-mentioned digital-analog audio frequency broadcast, described sound radio is FM broadcasting, i.e. FM broadcast.
The launching technique of above-mentioned digital-analog audio frequency broadcast, each share channel bandwidth is 180～220kHz.
The launching technique of above-mentioned digital-analog audio frequency broadcast, the adjacent band of described share channel is upper sideband and/or the lower sideband of 80 contiguous～800kHz of share channel.
The launching technique of above-mentioned digital-analog audio frequency broadcast, each share channel bandwidth is 200kHz, the adjacent band of share channel is upper sideband and/or the lower sideband of 100 contiguous～600kHz of share channel.
The launching technique of above-mentioned digital-analog audio frequency broadcast, total n the frequency range that bandwidth is 100kHz of upper lower sideband of share channel, n is 0～6 integer, and digital Audio Broadcasting signal uses share channel, or any in the 100kHz frequency range of sideband or appoint several above and/or under also using.
The launching technique of above-mentioned digital-analog audio frequency broadcast, it is following 16 kinds that described simulated sound broadcast singal and digital Audio Broadcasting signal use the mode of frequency range:
I bandwidth is the holotype of 200kHz
Simulated sound broadcast singal and digital Audio Broadcasting signal are overlapping in the bandwidth of 200kHz;
Ii bandwidth is the enhancement mode of 300kHz
Ii-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz,
Ii-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 100kHz;
Iii bandwidth is the enhancement mode of 400kHz
Iii-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz,
Iii-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 200kHz,
Iii-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of the each 100kHz of lower sideband;
Iv bandwidth is the enhancement mode of 500kHz
Iv-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz,
Iv-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 300kHz,
Iv-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz and lower sideband 100kHz,
Iv-4 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz and the frequency range of lower sideband 200kHz;
V bandwidth is the enhancement mode of 600kHz
V-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal is the symmetrical frequency range that uses the upper each 200kHz of lower sideband also,
V-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz and the frequency range of lower sideband 100kHz,
V-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz and the frequency range of lower sideband 300kHz;
Vi bandwidth is the enhancement mode of 700kHz
Vi-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz and the frequency range of lower sideband 200kHz,
Vi-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz and the frequency range of lower sideband 300kHz;
Vii bandwidth is the enhancement mode of 800kHz,
Simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal is the symmetrical frequency range that uses the upper each 300kHz of lower sideband also.
According to the transmitter of the digital-analog audio frequency broadcast of launching technique the present invention's design of above-mentioned digital-analog audio frequency broadcast, comprise simulated sound modulation module, digital audio modulation module, power amplifier and antenna-feedback system; Simulated sound modulation module produces simulated sound broadcast singal by required frequency range, and its input is connected to external audio source; Digital audio modulation module is pressed the frequency range that simulated sound broadcast singal is identical or is produced digital Audio Broadcasting signal by the identical frequency range of simulated sound broadcast singal and contiguous frequency range thereof, and its input is connected to external audio source or data source; The output of simulated sound modulation module is connected to synthesis module through resonance-amplifier, or the output of digital audio modulation module is connected to synthesis module through attenuator; Resonance-amplifier amplifies the power of simulated sound broadcast singal, or the power of attenuator reduction digital Audio Broadcasting signal, makes at least low 25dBc of power ratio simulated sound broadcast singal power of digital Audio Broadcasting signal.Synthesis module synthesizes a road analog and digital mixed signal simulated sound broadcast singal and digital Audio Broadcasting signal, in analog and digital mixed signal, simulated sound broadcast singal and digital Audio Broadcasting signal share a simulated sound broadcasting channel, or except common analog sound radio channel, digital Audio Broadcasting signal also uses the contiguous frequency range of share channel.The output of synthesis module is connected to power amplifier; Power amplifier is exported to antenna-feedback system after mixed signal is amplified, and goes out through antenna transmission, obtains the radiofrequency signal of predetermined spectrum pattern.
Simulated sound modulation module directly accesses synthesis module, and the output of digital audio modulation module also accesses synthesis module after digital to analog converter, the output access power amplifier of synthesis module, then connect antenna-feedback system.Or the output of simulated sound modulation module accesses synthesis module with together with the output of digital audio modulation module after analog to digital converter, and the output of synthesis module is access power amplifier after digital to analog converter again, then connects antenna-feedback system.
The output of simulated sound modulation module and digital audio modulation module also can first be amplified respectively.
The output of described simulated sound modulation module accesses synthesis module after first connecing a power amplifier, the output of digital audio modulation module also first connects digital to analog converter, after a power amplifier, also access synthesis module, the output of synthesis module connects antenna-feedback system more again;
Or the output of described simulated sound modulation module accesses synthesis module through analog to digital converter after first connecing a power amplifier, the output of digital audio modulation module also first connects an amplifier and accesses synthesis module again, and the output of synthesis module connects antenna-feedback system after digital to analog converter;
Or the output of described simulated sound modulation module is first through a power amplifier, access again an independent input end of common antenna, the output of digital audio modulation module first connects digital to analog converter, connect again a power amplifier, access afterwards another independent input end of same common antenna, aloft the radio frequency mixed signal of synthetic predetermined band;
Or the output of described simulated sound modulation module is first through a power amplifier, access again a secondary stand-alone antenna, the output of digital audio modulation module also first connects digital to analog converter, connect again a power amplifier, access afterwards another secondary stand-alone antenna, equally aloft the radio frequency mixed signal of synthetic predetermined band.
Described simulated sound modulation module is analog fm sound radio modulation module, and described digital audio modulation module is frequency-shift keying sound radio modulation module.
Described simulated sound modulation module and digital audio modulation module are output as baseband signal or intermediate-freuqncy signal, are connected to up-conversion module before antenna-feedback system.
Described simulated sound modulation module contains Direct Digital Frequency Synthesizers (Direct Digital Frequency Synthesis, DDS), realizes the digital processing of analoging sound signal.
Described digital audio modulation module comprises precoding unit, multiplexed unit and digital modulator.Multi-channel analog or digital audio and video signals and data flow access precoding unit, precoding unit comprises A/D converter, preaccentuator, condensing encoder etc., after being become to digital transmission form with Data Stream Processing, various input audio frequency send into multiplexed unit, the all data flow and the audio frequency that receive are combined into a code stream by multiplexed unit, then gives digital modulator.Digital modulator comprises scrambler, channel encoder, constellation mapping unit, becomes frame unit, OFDM modulation processing (english abbreviation is OFDM, i.e. Orthogonal frequency-division multiplexing) unit, speed to adjust filter unit.The code stream of input carries out randomization at scrambler, realize energy dissipation, channel encoder carries out channel error correction coding, detect and proofread and correct the error code producing due to disturb and noise etc. in transmitting procedure, send into afterwards constellation mapping unit, complete the sign map that channel after error correction coding carries out multiple qam digital modulation (english abbreviation is mQAM, i.e. Multiple Quadrature Amplitude Modulation).Meanwhile, synchronize data of system and control data, also pass through respectively similar channel encoder and constellation mapping processing unit.Frame unit is sent into in the output of each constellation mapping processing unit, at information composition signal frames such as this audio frequency and data flow, synchrodata, control data, signal frame is sent into OFDM modulation processing unit, different business data centralization is got up through inverse Fourier transform, and be placed on the time frequency grid of corresponding OFDM modulation, be on the subcarrier of different time different frequency, and it is zero that some OFDM modulation subcarrier coefficient on time frequency grid is set, and obtains the frequency spectrum of digital signal.Send into again speed and adjust filter unit, regulate transmission code rate, obtain digital Audio Broadcasting signal.
The transmitter of above-mentioned digital-analog audio frequency broadcast, simulated sound modulation module and digital audio modulation module output signal share channel bandwidth are 180～220kHz.
The transmitter of above-mentioned digital-analog audio frequency broadcast, the adjacent band of described share channel is upper sideband and/or the lower sideband of 80 contiguous～800kHz of share channel.
The transmitter of above-mentioned digital-analog audio frequency broadcast, each share channel bandwidth is 200kHz, the adjacent band of share channel is upper sideband and/or the lower sideband of 100 contiguous～600kHz of share channel.
The transmitter of above-mentioned digital-analog audio frequency broadcast, total n the frequency range that bandwidth is 100kHz of upper lower sideband of share channel, n is 0～6 integer, and digital Audio Broadcasting signal uses share channel, or any in the 100kHz frequency range of sideband or appoint several above and/or under also using.
The transmitter of above-mentioned digital-analog audio frequency broadcast, it is following 16 kinds that described simulated sound broadcast singal and digital Audio Broadcasting signal use the mode of frequency range:
I bandwidth is the holotype of 200kHz
Simulated sound broadcast singal and digital Audio Broadcasting signal are overlapping in the bandwidth of 200kHz;
Ii bandwidth is the enhancement mode of 300kHz
Ii-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz,
Ii-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 100kHz;
Iii bandwidth is the enhancement mode of 400kHz
Iii-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz,
Iii-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 200kHz,
Iii-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of the each 100kHz of lower sideband;
Iv bandwidth is the enhancement mode of 500kHz
Iv-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz,
Iv-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 300kHz,
Iv-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz and lower sideband 100kHz,
Iv-4 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz and the frequency range of lower sideband 200kHz;
V bandwidth is the enhancement mode of 600kHz
V-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal is the symmetrical frequency range that uses the upper each 200kHz of lower sideband also,
V-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz and the frequency range of lower sideband 100kHz,
V-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz and the frequency range of lower sideband 300kHz;
Vi bandwidth is the enhancement mode of 700kHz
Vi-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz and the frequency range of lower sideband 200kHz,
Vi-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz and the frequency range of lower sideband 300kHz;
Vii bandwidth is the enhancement mode of 800kHz,
Simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal is the symmetrical frequency range that uses the upper each 300kHz of lower sideband also.
The launching technique of digital-analog audio frequency broadcast of the present invention and the advantage of equipment are: digital Audio Broadcasting signal 1, superposes in the channel of former simulated sound broadcast singal and in adjacent frequency range, do not affecting on the basis of former simulated sound broadcast, simultaneously spreading digital simulated sound broadcast singal and auxiliary data message, do not need to distribute new frequency range, saved frequency spectrum resource; 2, it is versatile and flexible that simulated sound broadcast singal and digital Audio Broadcasting signal use the mode of frequency range, and upper lower sideband can be symmetrical or asymmetric, bandwidth is changeable; 3, the existing analog spectrum of the selection of frequency spectrum and China is divided compatibility, is applicable to the complex situations that China's frequency uses, and also can make full use of the dummy frequencies resource remaining, and will be conducive to the develop rapidly of China's sound radio.
(4) brief description of the drawings
Fig. 1 Fig. 1 is European DRM+ spectrum allocation may pattern.
Fig. 2 is the mixed mode frequency spectrum of IBOC-FM.
Fig. 3 is the enhancing mixed mode frequency spectrum of IBOC-FM.
Fig. 4 is the digital mode spectrum of IBOC-FM.
Fig. 5 is Chinese FM spectrum allocation may schematic diagram.
Fig. 6 is Chinese FM frequency modulation binodal order baseband plot.
Fig. 7 is the stereo additional program baseband plot of 67kHz subcarrier.
Fig. 8 is the stereo additional program baseband plot of 76kHz subcarrier.
Fig. 9 is the spectrum diagram of this digital-analog audio frequency broadcast embodiment of the method holotype.
Figure 10 is the 300kHz spectral combination mode (comprising Figure 10-1,10-2) of the launching technique embodiment of this digital-analog audio frequency broadcast.
Figure 11 is the 400kHz spectral combination mode (comprising Figure 11-1,11-2,11-3) of the launching technique embodiment of this digital-analog audio frequency broadcast.
Figure 12 is the 500kHz spectral combination mode (comprising Figure 12-1～12-4) of the launching technique embodiment of this digital-analog audio frequency broadcast.
Figure 13 is the 600kHz spectral combination mode (comprising Figure 13-1,13-2,13-3) of the launching technique embodiment of this digital-analog audio frequency broadcast.
Figure 14 is the 700kHz spectral combination mode (comprising Figure 14-1,14-2) of the launching technique embodiment of this digital-analog audio frequency broadcast.
Figure 15 is the 800kHz spectral combination mode of the launching technique embodiment of this digital-analog audio frequency broadcast.
Figure 16 is the transmitter embodiment circuit structure theory diagram of this digital-analog audio frequency broadcast.
(5) embodiment
The launching technique embodiment of digital-analog audio frequency broadcast
This example is the launching technique of digital-to-analogue audio frequency FM broadcasting, comprises the following steps:
I, generation simulated sound fm broadcast signal;
II, generation digital audio fm broadcast signal;
III, simulated sound broadcast singal and digital Audio Broadcasting signal are synthesized to a road analog and digital mixed signal, and to share a bandwidth be 200kHz simulated sound broadcasting channel, on shared channel, at least low 25dBc of the power ratio simulated sound broadcast singal power of digital Audio Broadcasting signal;
Digital Audio Broadcasting signal also uses the contiguous frequency range of the two share channel, i.e. enhancement mode;
The spectral bandwidth of this routine enhancement mode support reaches 800kHz, is 7 frequency ranges by the frequency band division of 800kHz, and wherein 200kHz shares for simulated sound fm broadcast signal and digital audio fm broadcast signal, i.e. holotype; The frequency band division of all the other 600kHz is 6 frequency ranges of bandwidth 100kHz.When sharing frequency range and be placed in 800kHz frequency band middle, upper lower sideband respectively has three frequency ranges of bandwidth 100kHz.The digital Audio Broadcasting signal of enhancement mode also can select in these 6 frequency ranges wantonly 1 or appoint several.Holotype and enhancement mode have 2
6=64 kinds of Frequency Band Selection modes, as shown in table 1, in table, numeral 1 represents that this frequency range is used, numeral 0 represents that this frequency range is idle.Share frequency range and be placed in the centre of 800kHz frequency band if do not limited, its compound mode will be more.
Table 1 digital-analog audio frequency broadcast embodiment of the method
The frequency band division of 800kHz is the Frequency Band Selection mode list in the middle of 7 frequency ranges, shared frequency range 200kHz are placed in
As shown in table 1, digital Audio Broadcasting signal uses the mode of frequency range versatile and flexible, is preferably following 16 kinds:
I bandwidth is the holotype of 200kHz
Simulated sound broadcast singal and digital Audio Broadcasting signal are overlapping in the bandwidth of 200kHz; I.e. mode 0 in table 1, as shown in Figure 9;
Ii bandwidth is the enhancement mode of 300kHz
Ii-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz, i.e. mode 4 in table 1, as shown in the 10-1 in Figure 10;
Ii-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 100kHz; I.e. mode 8 in table 1, as shown in 10-2 in Figure 10;
Iii bandwidth is the enhancement mode of 400kHz
Iii-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz, i.e. mode 6 in table 1, and as shown in 11-1 in Figure 11,
Iii-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 200kHz, i.e. mode 24 in table 1, and as shown in 11-2 in Figure 11,
Iii-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of the each 100kHz of lower sideband, i.e. mode 12 in table 1, as shown in 11-3 in Figure 11;
Iv bandwidth is the enhancement mode of 500kHz
Iv-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz, i.e. mode 7 in table 1, and as shown in 12-1 in Figure 12,
Iv-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 300kHz, i.e. mode 56 in table 1, and as shown in 12-2 in Figure 12,
Iv-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz and lower sideband 100kHz, i.e. mode 14 in table 1, and as shown in 12-3 in Figure 12,
Iv-4 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz and the frequency range of lower sideband 200kHz, i.e. mode 28 in table 1, as shown in 12-4 in Figure 12;
V bandwidth is the enhancement mode of 600kHz
V-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal is the symmetrical frequency range that uses the upper each 200kHz of lower sideband also, i.e. mode 30 in table 1, and as shown in 13-1 in Figure 13,
V-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz and the frequency range of lower sideband 100kHz, i.e. mode 15 in table 1, and as shown in 13-2 in Figure 13,
V-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz and the frequency range of lower sideband 300kHz, i.e. mode 60 in table 1, as shown in 13-3 in Figure 13;
Vi bandwidth is the enhancement mode of 700kHz
Vi-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz and the frequency range of lower sideband 200kHz, i.e. mode 31 in table 1, as shown in 14-1 in Figure 14
Vi-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz and the frequency range of lower sideband 300kHz, i.e. mode 62 in table 1, as shown in 14-2 in Figure 14;
Vii bandwidth is the enhancement mode of 800kHz,
Simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal is the symmetrical frequency range that uses the upper each 300kHz of lower sideband also, i.e. mode 63 in table 1, as shown in Figure 11 15.
IV, Hybrid-modulated Signal by antenna transmission, obtain the radiofrequency signal of above-mentioned predetermined spectrum pattern after amplifying after antenna-feedback system.
The transmitter embodiment of digital-analog audio frequency broadcast
The transmitter embodiment of this digital-analog audio frequency broadcast as shown in figure 16, comprises simulated sound modulation module, digital audio modulation module, power amplifier, attenuator, up-conversion module and antenna-feedback system, also has synthesis module; Simulated sound modulation module produces simulated sound broadcast singal, and its input is connected to external audio source, and output is connected to synthesis module; Digital audio modulation module produces digital Audio Broadcasting signal, and its input is connected to external audio source or data source, and output, through digital-to-analog converter and attenuator, becomes digital signal into analog signal, and decays to predetermined power level, is then connected to synthesis module; Synthesis module synthesizes a road analog and digital mixed signal simulated sound broadcast singal and digital Audio Broadcasting signal, in analog and digital mixed signal, simulated sound broadcast singal and digital Audio Broadcasting signal share a simulated sound broadcasting channel, or except the frequency range that shares a simulated sound broadcasting channel, digital Audio Broadcasting signal also uses share channel vicinity.The output of synthesis module connects up-conversion module; Up-conversion module is moved radio frequency composite signal from base band, and the output of up-conversion module is connected to high frequency power amplifier; Power amplifier outputs to antenna-feedback system after mixed signal is amplified, and goes out through antenna transmission, obtains the radiofrequency signal of predetermined spectrum pattern.
Attenuator decays to the power level of digital Audio Broadcasting signal than the low 25dBc of simulated sound broadcast singal power, and the power of the digital Audio Broadcasting signal in the synthetic mixed signal of synthesis module keeps than the low 25dBc of simulated sound broadcast singal power.
Described simulated sound modulation module is analog fm sound radio modulation module, and described digital audio modulation module is frequency-shift keying sound radio modulation module
Described simulated sound modulation module is similar to existing simulated sound frequency modulation broadcast system, according to analog fm broadcast technology specification, the voice signal of input is modulated to FM signal.Modulating signal of frequency modulation is expressed as:
S
FM(t)＝A
Ccos[2πf
Ct+K
fa/f
m?sin(2πf
mt)]
Wherein, baseband signal m (t)=a cos (2 π f
mt),
Carrier signal c (t)=A
ccos (2 π f
ct),
Frequency shift (FS) constant is K
f,
Modulation index β
f=K
fa/f
m.
This routine simulated sound modulation module contains Direct Digital Frequency Synthesizers, realizes the digital processing of analoging sound signal.
Described digital audio modulation module comprises precoding unit, multiplexed unit and digital modulator.Multi-channel analog or digital audio and video signals and data flow access precoding unit, precoding unit comprises A/D converter, preaccentuator, condensing encoder etc., after being become to digital transmission form with Data Stream Processing, various input audio frequency send into multiplexed unit, the all data flow and the audio frequency that receive are combined into a code stream by multiplexed unit, then gives digital modulator.Digital modulator comprises scrambler, channel encoder, constellation mapping unit, becomes frame unit, OFDM modulation processing unit (OFDM unit), speed to adjust filter unit.The code stream of input carries out randomization at scrambler, realizes energy dissipation, and channel encoder carries out channel error correction coding.In the present embodiment, channel error correction coding has adopted loe-density parity-check code (Low Density Parity Check, LDPC), channel encoder increases redundant information, detect and proofread and correct the error code producing due to disturb and noise etc. in transmitting procedure, channel encoder is followed an interleaver, burst continuous error code discrete be random error, within dropping on error correcting capability scope.Send into afterwards constellation mapping unit, complete the sign map that the channel after error correction coding carries out multiple qam digital modulation.Meanwhile, synchronize data of system and control data, also pass through respectively similar channel encoder and constellation mapping processing unit.Frame unit is sent into in the output of each constellation mapping processing unit, at information composition signal frames such as this audio frequency and data flow, synchrodata, control data, signal frame is sent into OFDM modulation processing (OFDM) unit, different business data centralization is got up through inverse Fourier transform, and be placed on corresponding OFDM time frequency grid, be on the subcarrier of different time different frequency, and some OFDM subcarrier coefficient on time frequency grid is set is zero, obtains the frequency spectrum of digital signal.
This routine frequency spectrum is to be 7 frequency ranges by the frequency band division of 800kHz, and wherein middle 200kHz and simulated sound fm broadcast signal share, i.e. holotype; The frequency band division of all the other 600kHz is 6 frequency ranges of bandwidth 100kHz.The digital Audio Broadcasting signal of enhancement mode shares except taking middle 200kHz and simulated sound fm broadcast signal, also can select in these 6 frequency ranges wantonly 1 or appoint several, as shown in table 1, the numeral 1 in table 1 represents that this frequency range is used, and OFDM subcarrier coefficient carries valid data; Numeral 0 represents that this frequency range is idle, and corresponding OFDM subcarrier coefficient is set to 0.The groups of frequency bands syntype that this example is mainly selected is following 16 kinds:
I bandwidth is the holotype of 200kHz
Simulated sound broadcast singal and digital Audio Broadcasting signal are overlapping in the bandwidth of 200kHz; I.e. mode 0 in table 1, as shown in Figure 9;
Ii bandwidth is the enhancement mode of 300kHz
Ii-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz, i.e. mode 4 in table 1, as shown in the 10-1 in Figure 10;
Ii-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 100kHz; I.e. mode 8 in table 1, as shown in 10-2 in Figure 10;
Iii bandwidth is the enhancement mode of 400kHz
Iii-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz, i.e. mode 6 in table 1, and as shown in 11-1 in Figure 11,
Iii-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 200kHz, i.e. mode 24 in table 1, and as shown in 11-2 in Figure 11,
Iii-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of the each 100kHz of lower sideband, i.e. mode 12 in table 1, as shown in 11-3 in Figure 11;
Iv bandwidth is the enhancement mode of 500kHz
Iv-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz, i.e. mode 7 in table 1, and as shown in 12-1 in Figure 12,
Iv-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 300kHz, i.e. mode 56 in table 1, and as shown in 12-2 in Figure 12,
Iv-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz and lower sideband 100kHz, i.e. mode 14 in table 1, and as shown in 12-3 in Figure 12,
Iv-4 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz and the frequency range of lower sideband 200kHz, i.e. mode 28 in table 1, as shown in 12-4 in Figure 12;
V bandwidth is the enhancement mode of 600kHz
V-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal is the symmetrical frequency range that uses the upper each 200kHz of lower sideband also, i.e. mode 30 in table 1, and as shown in 13-1 in Figure 13,
V-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz and the frequency range of lower sideband 100kHz, i.e. mode 15 in table 1, and as shown in 13-2 in Figure 13,
V-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz and the frequency range of lower sideband 300kHz, i.e. mode 60 in table 1, as shown in 13-3 in Figure 13;
Vi bandwidth is the enhancement mode of 700kHz
Vi-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz and the frequency range of lower sideband 200kHz, i.e. mode 31 in table 1, as shown in 14-1 in Figure 14
Vi-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz and the frequency range of lower sideband 300kHz, i.e. mode 62 in table 1, as shown in 14-2 in Figure 14;
Vii bandwidth is the enhancement mode of 800kHz,
Simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal is the symmetrical frequency range that uses the upper each 300kHz of lower sideband also, i.e. mode 63 in table 1, as shown in figure 15.
Then between each OFDM symbol of digital signal, insert protection interval (Guard Interval; GI); in each segment protect interval GI, can not put into any signal, GI is one period of idle transmission period; be called zero padding; or in GI, insert one section of known particular sequence, such as PN sequence, or in GI, put into a Cyclic Prefix (Cyclic Prefix; CP), become the period expansion of an OFDM symbol.In the present embodiment, adopted this CP-OFDM mode.So far this broadcasting equipment transmitting terminal signal has completed chnnel coding and constellation mapping modulation.Then send into speed and adjust filter unit, through-rate is adjusted filtering, regulates transmission code rate, obtains digital Audio Broadcasting signal.
This number of cases word sound broadcasting signal is baseband modulation signal, after digital-to-analogue (D/A) modular converter, become an analog signal, give attenuator, the power level of digital Audio Broadcasting signal is decayed to than the low 25dBc of simulated sound broadcast singal power.
The output of this routine simulated sound modulation module directly accesses synthesis module, the output of digital audio modulation module also accesses synthesis module after digital to analog converter and attenuator, synthesis module is mixed into an analog digital audio broadcast signal by binary signal and sends into up-conversion module, up-conversion module is moved corresponding radio-frequency transmissions channel by gained signal from base band, carry out power amplifier through power amplifier afterwards, send into transmitting antenna by antenna-feedback system, the radiofrequency signal of transmitting specific frequency spectrum pattern.
For above-mentioned signal building-up process, except the Analog Baseband mode that this example adopts, also can complete at digital baseband, analog intermediate frequency or radio frequency, or two kinds of broadcast singals are synthetic in antenna end, give two independent input ends of same common antenna, or give independently antenna transmission of two pairs, realize skyborne synthetic.
In addition, also can after simulated sound modulation module, connect resonance-amplifier, replace the attenuator connecing after digital audio modulation module.Resonance-amplifier amplifies simulated sound broadcast singal, makes it power level at least higher than digital Audio Broadcasting signal power 25dBc, but will prevent the additional noise that resonance-amplifier may be introduced.
The receiving equipment matching with the transmitter of this digital-analog audio frequency broadcast carries out demodulating and decoding according to the contrary order of this transmitter, can obtain the data of source.The radio frequency rf signal of antenna reception becomes medium-frequency IF signal or zero intermediate frequency signals after tuner module, then, through A/D conversion, is converted to digital signal.Reception signal after digitlization is divided into two-way, and simulation FM demodulator is given on a road, and analog fm signal is carried out to amplitude limit, bandpass filtering and noise reduction process.Because the power of digital FM broadcast singal is simulated FM broadcast singal much smaller than co-channel (adjective), be rendered as form of noise, utilize distribution and the size of known training sequence (synchronizing sequence of for example digital FM) estimative figure FM signal, carry out noise reduction process, as noise cleaning, avoid the interference to simulation FM broadcast singal by digital FM broadcast singal.After demodulation, simulated audio signal amplifies rear drive loud speaker through low frequency.
Another railway digital signal is given digital FM demodulating and decoding module.First simulate FM cancellation module by simulation FM broadcast singal is carried out to input and valuation, by iteration successive elimination simulation FM broadcast singal, thereby reduce the interference of co-channel middle simulation FM broadcast singal to digital FM broadcast singal.The synchronous module of recovering is calculated synchronous error, to the laggard link synchronization tracing of error filtering, obtains system synchronization.The OFDM symbol receiving is carried out to Fourier transform, the Fourier Transform Coefficients based on channel frequency response is carried out to channel estimating and equilibrium, the data of acquisition are carried out forward error correction (FEC, Forward Error Correction) channel-decoding.Channel-decoding comprises a deinterleaver, the resistance of disturbing for improving paired pulses.Fec decoder can adopt LDPC (Low Density Parity Check) decoder, this is soft-decision iterative decoder, in the time that iterative process has reached the maximum iteration time (complete iteration) of regulation, or when there is no error code (part iteration) in error detection and error correcting processing time, iterative process will finish.Because transmitter had used pseudo random sequence (PN, Pseudo-Random) to carry out randomization before channel error correction coding, therefore, in receiving equipment, need error correction data to go randomization.Go the code stream after randomization to give source coding, recover audio program and other data of sending.
Above-described embodiment, is only the specific case that object of the present invention, technical scheme and beneficial effect are further described, and the present invention is not defined in this.All any amendments of making, be equal to replacement, improvement etc., within being all included in protection scope of the present invention within scope of disclosure of the present invention.
Claims (11)
1. the launching technique of digital-analog audio frequency broadcast, is characterized in that step is as follows:
I, simulated audio signal produce simulated sound broadcast singal;
II, multi-channel analog or digital audio and video signals and data flow produce digital Audio Broadcasting signal after digital audio modulation module is processed, and wherein digital audio modulation module comprises precoding unit, multiplexed unit and digital modulator; Multi-channel analog or digital audio and video signals and data flow access precoding processing unit, precoding processing unit comprises A/D converter, preaccentuator, condensing encoder, the output access multiplexer unit of precoding processing unit, multiplexed unit connects digital modulator again, and digital modulator comprises scrambler, channel encoder, constellation mapping unit, becomes frame unit, OFDM modulation processing unit, speed to adjust filter unit; The code stream access scrambler of input, sends into constellation mapping unit after channel encoder, meanwhile, synchronize data of system and control data, also channel encoder is sent into constellation mapping processing unit respectively; The output of each constellation mapping processing unit, through becoming frame unit, OFDM modulation processing unit, connects speed and adjusts filter unit, and the output that speed is adjusted filter unit is the output of digital Audio Broadcasting modulation module;
III, simulated sound broadcast singal and digital Audio Broadcasting signal are synthesized to a road analog and digital mixed signal share a simulated sound broadcasting channel, each share channel bandwidth is 200kHz, total n the adjacent band that bandwidth is 100kHz of upper lower sideband of share channel, n is 0～6 integer, and digital Audio Broadcasting signal also uses any in the 100kHz frequency range of sideband above and/or under these or appoints several;
After IV, Hybrid-modulated Signal are amplified, through antenna-feedback system transmitting, obtain the radiofrequency signal of following dominant frequency spectral model and enhancement mode:
The holotype that IV-1, bandwidth are 200kHz;
The enhancement mode that IV-2, bandwidth are 300kHz;
The enhancement mode that IV-3, bandwidth are 400kHz;
The enhancement mode that IV-4, bandwidth are 500kHz;
The enhancement mode that IV-5, bandwidth are 600kHz;
The enhancement mode that IV-6, bandwidth are 700kHz;
The enhancement mode that IV-7, bandwidth are 800kHz.
2. the launching technique of digital-analog audio frequency broadcast according to claim 1, is characterized in that:
Described step III is on shared channel, and the power of digital Audio Broadcasting signal is at least low 25dBc than simulated sound broadcast singal power.
3. the launching technique of digital-analog audio frequency broadcast according to claim 1 and 2, is characterized in that:
Described sound radio is FM broadcasting.
4. the launching technique of digital-analog audio frequency broadcast according to claim 1, is characterized in that:
It is following 16 kinds that described simulated sound broadcast singal and digital Audio Broadcasting signal use spectrum mode:
I bandwidth is the holotype of 200kHz
Simulated sound broadcast singal and digital Audio Broadcasting signal are overlapping in the bandwidth of 200kHz;
II bandwidth is the enhancement mode of 300kHz
II-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz,
II-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 100kHz;
III bandwidth is the enhancement mode of 400kHz
III-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz,
III-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 200kHz,
III-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of the each 100kHz of lower sideband;
IV bandwidth is the enhancement mode of 500kHz
IV-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz,
IV-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 300kHz,
IV-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz and lower sideband 100kHz,
IV-4 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz and the frequency range of lower sideband 200kHz;
V bandwidth is the enhancement mode of 600kHz
V-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal is the symmetrical frequency range that uses the upper each 200kHz of lower sideband also,
V-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz and the frequency range of lower sideband 100kHz,
V-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz and the frequency range of lower sideband 300kHz;
VI bandwidth is the enhancement mode of 700kHz
VI-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz and the frequency range of lower sideband 200kHz,
VI-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz and the frequency range of lower sideband 300kHz;
VII bandwidth is the enhancement mode of 800kHz,
Simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal is the symmetrical frequency range that uses the upper each 300kHz of lower sideband also.
5. a transmitter for digital-analog audio frequency broadcast, comprises simulated sound modulation module, digital audio modulation module, resonance-amplifier, attenuator, synthesis module, power amplifier and antenna-feedback system, it is characterized in that:
The simulated sound modulation module that produces simulated sound broadcast singal by required frequency range, its input is connected to external audio source; Be connected to external audio source or data source by the identical frequency range of simulated sound broadcast singal or by the input of the digital audio modulation module of the frequency range generation digital Audio Broadcasting signal of the identical frequency range of simulated sound broadcast singal and vicinity thereof; The output of simulated sound modulation module is connected to synthesis module through resonance-amplifier, and the output of digital audio modulation module is connected to synthesis module through attenuator, at least low 25dBc of power ratio simulated sound broadcast singal power of digital Audio Broadcasting signal; The output of synthesis module is connected to power amplifier; The output of power amplifier is sent into antenna-feedback system by antenna transmission;
Wherein, described digital audio modulation module comprises precoding unit, multiplexed unit and digital modulator; Multi-channel analog or digital audio and video signals and data flow access precoding unit, precoding unit comprises A/D converter, preaccentuator, condensing encoder, the output access multiplexer unit of precoding unit, multiplexed unit connects digital modulator again, and digital modulator comprises scrambler, channel encoder, constellation mapping unit, becomes frame unit, OFDM modulation processing unit, speed to adjust filter unit; The code stream access scrambler of input, sends into constellation mapping unit after channel encoder, meanwhile, synchronize data of system and control data, also channel encoder is sent into constellation mapping processing unit respectively; The output of each constellation mapping processing unit, through becoming frame unit, OFDM modulation processing unit, connects speed and adjusts filter unit, and the output that speed is adjusted filter unit is the output of digital Audio Broadcasting modulation module;
Described synthesis module synthesizes the shared simulated sound broadcasting channel of a road analog and digital mixed signal simulated sound broadcast singal and digital Audio Broadcasting signal, each share channel bandwidth is 200kHz, total n the adjacent band that bandwidth is 100kHz of upper lower sideband of share channel, n is 0～6 integer, and digital Audio Broadcasting signal also uses any in the 100kHz frequency range of sideband above and/or under these or appoints several.
6. the transmitter of digital-analog audio frequency broadcast according to claim 5, is characterized in that:
Also comprise digital to analog converter, the output of the output of described simulated sound modulation module and digital audio modulation module accesses synthesis module together with after digital to analog converter, the output access power amplifier of synthesis module, then connect antenna-feedback system;
Or the output of described simulated sound modulation module accesses synthesis module with together with the output of digital audio modulation module after analog to digital converter, and the output of synthesis module is access power amplifier after digital to analog converter again, then connects antenna-feedback system.
7. the transmitter of digital-analog audio frequency broadcast according to claim 5, is characterized in that:
The output of described simulated sound modulation module accesses synthesis module after first connecing a power amplifier, and the output of digital audio modulation module first connects digital to analog converter, more also accesses synthesis module after a power amplifier, and the output of synthesis module connects antenna-feedback system again;
Or the output of described simulated sound modulation module accesses synthesis module through analog to digital converter after first connecing a power amplifier, the output of digital audio modulation module first connects an amplifier and accesses synthesis module again, and the output of synthesis module connects antenna-feedback system after digital to analog converter;
Or the output of described simulated sound modulation module is first through a power amplifier, access again an independent input end of common antenna, the output of digital audio modulation module first connects digital to analog converter, again through a power amplifier, access afterwards another independent input end of same common antenna;
Or the output of described simulated sound modulation module is first through a power amplifier, then accesses a secondary stand-alone antenna, and the output of digital audio modulation module first connects digital to analog converter, then after a power amplifier, accesses another secondary stand-alone antenna.
8. the transmitter of digital-analog audio frequency broadcast according to claim 5, is characterized in that:
Described simulated sound modulation module is analog fm sound radio modulation module, and described digital audio modulation module is frequency-shift keying sound radio modulation module.
9. the transmitter of digital-analog audio frequency broadcast according to claim 8, is characterized in that:
Also comprise up-conversion module, described simulated sound modulation module and digital audio modulation module are output as baseband signal or intermediate-freuqncy signal, are connected to up-conversion module before antenna-feedback system.
10. the transmitter of digital-analog audio frequency broadcast according to claim 5, is characterized in that:
Described simulated sound modulation module contains Direct Digital Frequency Synthesizers.
The transmitter of 11. digital-analog audio frequency broadcasts according to claim 5, is characterized in that:
It is following 16 kinds that described simulated sound broadcast singal and digital Audio Broadcasting signal use spectrum mode:
I bandwidth is the holotype of 200kHz
Simulated sound broadcast singal and digital Audio Broadcasting signal are overlapping in the bandwidth of 200kHz;
II bandwidth is the enhancement mode of 300kHz
II-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz,
II-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 100kHz;
III bandwidth is the enhancement mode of 400kHz
III-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz,
III-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 200kHz,
III-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of the each 100kHz of lower sideband;
IV bandwidth is the enhancement mode of 500kHz
IV-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz,
IV-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of lower sideband 300kHz,
IV-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz and lower sideband 100kHz,
IV-4 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz and the frequency range of lower sideband 200kHz;
V bandwidth is the enhancement mode of 600kHz
V-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal is the symmetrical frequency range that uses the upper each 200kHz of lower sideband also,
V-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz and the frequency range of lower sideband 100kHz,
V-3 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 100kHz and the frequency range of lower sideband 300kHz;
VI bandwidth is the enhancement mode of 700kHz
VI-1 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 300kHz and the frequency range of lower sideband 200kHz,
VI-2 simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal also uses the frequency range of upper sideband 200kHz and the frequency range of lower sideband 300kHz;
VII bandwidth is the enhancement mode of 800kHz
Simulated sound broadcast singal and digital Audio Broadcasting signal share the frequency range of 200kHz, and digital Audio Broadcasting signal is the symmetrical frequency range that uses the upper each 300kHz of lower sideband also.
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| CN102394739B (en) * | 2011-08-06 | 2014-03-12 | 桂林市思奇通信设备有限公司 | Generation method and transmitting equipment for in band on channel (IBOC) digital/analog audio broadcast signals |
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