CN202406103U - Transmitting apparatus for in-band on-channel digital-analog audio frequency broadcast signal - Google Patents
Transmitting apparatus for in-band on-channel digital-analog audio frequency broadcast signal Download PDFInfo
- Publication number
- CN202406103U CN202406103U CN2011202845733U CN201120284573U CN202406103U CN 202406103 U CN202406103 U CN 202406103U CN 2011202845733 U CN2011202845733 U CN 2011202845733U CN 201120284573 U CN201120284573 U CN 201120284573U CN 202406103 U CN202406103 U CN 202406103U
- Authority
- CN
- China
- Prior art keywords
- digital
- channel
- unit
- output
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Abstract
The utility model relates to a transmitting apparatus for in-band on-channel digital-analog audio frequency broadcast signals, comprising a simulation sound modulation module, a digital signal modulation module, a hybrid module, a digital analog converter, an upper transformation module, a power amplifier and an antenna feed system. The digital modulator of the digital signal modulation module generates digital signals and copies the digital signals in adjacent signal frames; the hybrid module comprises an adder and a subtracter, the values of the simulation sound broadcasting signals in adjacent signal frames *2m, *2m+1 are respectively added and subtracted by dm to obtain the digital-analog mixing signals the simulation sound broadcasting signals in adjacent signal frames *2m-dm, *2m+1+dm, which are transmitted in the same broadcast channel. According to the utility model, the digital-analog mixing signals with completely overlapped frequency spectrum are obtained, the frequency band is saved, and the complete separation of digital-analog signals at a receiving end is promoted.
Description
(1) technical field
The utility model belongs to the digital audio broadcasting technical field, specifically, relates to time domain and mixes in-band on-channel (Time Domain Overlapping-In Band On Channel, the TDO-IBOC) transmitting apparatus of digital-to-analogue audio broadcast signal repeatedly.
(2) background technology
Amplitude modulation (Amplitude Modulation, AM) broadcasting starts from nineteen twenty, and (Frequency Modulation, FM) broadcasting starts from 1940 to frequency modulation.In China, from the 1950's to the sixties, intermediate waves broadcasting develops rapidly, gets into the seventies, and the FM FM broadcasting emerges rapidly, and the tonequality of broadcasting significantly improves, and FM broadcasting has obtained using widely.Though fast development along with TV, the Internet, mobile radio communication; Traditional audio broadcasting had once become time important medium mode; Development speed lags far behind other main circulation way, but audio broadcasting has its certain applications environment and demand, still is 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 global digitized tide; Audio broadcasting has begun digital radio no exceptionly; People have proposed many digitizing technique schemes, mainly contain digital audio broadcasting (DAB, Digital Audio Broadcasting), (DRM of digital am system in Europe; Digital Radio Mondiale) and the high-fidelity of U.S. broadcasting (High Definition Radio, HD Radio) system.
DAB digital audio broadcast system employing OFDM (Orthogonal Frequency Division Multiplexing, OFDM) modulation system; Has High Data Rate (the clean data transfer rate of main business about 1.5～1.7Mb/s); The high quality audio of CD level can be provided, and characteristics such as have that stronger anti-multipath interference performance, transmitting power are little, the availability of frequency spectrum is high and professional formation is flexible are mainly used in city broadcasting to cover; But; DAB does not have the compatibility of consideration and existing frequency modulation, is to replace to existing FM frequency modulation, and existing FM radio station can only wait DAB after its all band (III wave band, L-band) develops into to a certain degree; Could original FM broadcasting Close All are used for digital audio broadcasting to corresponding frequency modulation frequency range again.Therefore, DAB system and existing frequency modulation system are difficult to realize seamlessly transitting.The digital audio broadcasting DAB canonical reference Europe DAB standard that China formulates; And begun DAB broadcasting on Beijing and other places; But used frequency range is not original modulating FM and amplitude modulation AM frequency range; Divided broadcast band for it specially, and the DAB broadcast receiver costs an arm and a leg, be difficult to obtain user's extensive approval.Therefore, its popularization is restricted, and does not accomplish the marketization and industrialization so far.
DRM digital am system develops to the Mid and Short Wave Amplitude Modulation digitlization below the 30MHz at first; Through studying for many years and realizing; DRM is organized in and has submitted the following digital am broadcasting of 30MHz recommendation (ITU-R BS.1514) to ITU April 4 calendar year 2001, and passes.In November, 2004, the DRM tissue proposed a suggestion that DRM is expanded to 30MHz～120MHz frequency range; Be DRM+; Its target is exploitation and standardization DRM expanding system; Be the digitizing technique of VHF wave band (traditional FM broadcasting frequency range), make its frequency cover wave band I, II and III, become open international standard from the LW wave band to the VHF wave band.DRM+ and FM frequency modulation are as shown in Figure 1 with the spectrogram of broadcasting, the band separation Δ f >=150kHz of DRM+ definition, difference power Δ P >=20dB.
In-band on-channel (In-Band On-Channel; IBOC) HD Radio high-fidelity broadcast system is the digital radio system that is developed to FM FM broadcasting and AM amplitude modulation medium wave broadcast digital improvement by U.S. iBiquity Digital company; The permission that on November 15th, 2000 obtained International Telecommunication Union; In October, 2002, U.S. FCC (FCC) confirms as the unique standards for digital broadcasting of the U.S. with it.The traditional FM broadcasting of the U.S. is distributed in 88～108MHz, and each channel bandwidth is 200kHz, over one hundred the station channel of can layouting approximately.IBOC-FM increases digital sidebands and is used to transmit audio frequency or out of Memory on the basis of original frequency modulation analog frequency band, and each radio station can take the bandwidth of 400kHz, and the compatible existing FM frequency modulation system of IBOC-FM need not redistributed frequency spectrum.Compare with other digital audio broadcast modes, the advantage of HD Radio high-fidelity broadcast system is to realize the smooth transition of analog to digital.But HD Radio system use be fixed on analog signal up and down the digital signal of two sidebands transmit, cause the mutual interference mutually and the signal covering problem of numeral and analog broadcasting.
HD Radio high-fidelity broadcast system two sidebands about conventional FM FM signal have been created the set of number sideband; It has three kinds of spectrum allocation may patterns: mixed mode, extended hybrid pattern, digital pattern; The frequency spectrum that a remarkable common ground of these patterns is analog fm signal and digital frequency-modulation signal does not have overlapping in same analog fm channel, exclusively enjoys certain section channel separately.
Under mixed mode; The digital sidebands that lower sideband increases about 70kHz respectively on original analog fm signal is used for transmission of digital signals; Analog fm signal spectrum position and shape remain unchanged; The spectrum allocation may mode is as shown in Figure 2, and lower sideband is that digital frequency-modulation signal takies on the analog fm signal both sides.Mixed mode (Hybrid Mode) provides the data transfer rate of 97kbps, comprising the auxiliary data of voice data and the 1kbps of 96kbps, the perhaps auxiliary data of the voice data of 64kbps and 33kbps.Compare mixed mode; The partial channel of former simulation FM signal has been occupied in the digital sidebands expansion of extended hybrid pattern (Extended Hybrid Mode); Last lower sideband respectively has more 28kHz, has promptly reduced the bandwidth of analog fm signal, but that both frequency spectrums still do not have is shared; The spectrum allocation may mode is as shown in Figure 3, and analog fm signal both sides arrow indication is lower sideband on the numeral of expansion.The extended hybrid pattern provides the data transfer rate of 147kbps, comprising the auxiliary data of voice data and the 51kbps of 96kbps, the perhaps auxiliary data of the voice data of 64kbps and 83kbps.This pattern is also supported to simulate stereo and radio data system (RDS), in the extended hybrid pattern, has reduced the spectrum width of analog fm signal, makes way for the digital spectrum of expansion, upper and lower each 30kHz of sideband expansion.Under digital pattern, as shown in Figure 4, original analog signal is stopped using, and is replaced by digital signal fully, and the main digital signal both sides are that numeral goes up lower sideband, in addition lower sideband on the numeral of the expansion of arrow indication.Do not had analog signal in the spectrum allocation may mode of digital pattern, the 277kbps data transfer rate can be provided, comprising the auxiliary data of voice data and the 181kbps of 96kbps, the perhaps auxiliary data of the voice data of 64kbps and 213kbps.Can find out that the power of main channel transmission that is in both sides is more a lot of greatly than the channel that mediates.
FM broadcasting spectrogram by Fig. 2,3 and 4 HD Radio high-fidelity broadcast system can be seen; It requires frequency interval is 400kHz; Because existing tuned radio frequency is spaced apart 200kHz; Therefore, broadcast the digital broadcasting that carries out the transition to HD Radio high-fidelity broadcast system by analog fm, with the bandwidth that takies a times more.This is in the intensive area of f-m broadcast station, and possibly can't be with all radio station digitlizations.To this, HD Radio high-fidelity broadcast system has adopted half-way house, when the FM radio station frequency planning, guarantees that the radio station of 200kHz does not appear in the adjacent both sides of FM radio station simultaneously.Nonetheless, system still need consider the first adjacent channel interference problem.
The frequency spectrum of HD Radio system digital frequency-modulation signal of analog fm signal and last lower sideband in main channel is nonoverlapping fully, but has mutual interference mutually with first adjacent channel, and is as shown in Figure 5.Therefore be difficult to be applicable to existing frequency modulation frequency range, for example the frequency modulation channel of China.
In China, frequency modulation audio broadcasting frequency scope dictates is at 87～108MHz, and its spectrum allocation may is as shown in Figure 6.Domestic frequency modulation audio broadcast mode is by GBT 4311 standards, and modulation frequency is spaced apart 200kHz.Except monophony and stereophonic broadcasting, broadcasting of multichannel sound and frequcny modulation data are broadcasted two types to have gone back standard.The existing FM broadcasting of China is main with analog signal; Utilize the base band idle frequency spectrum to modulate the mode of additional information though also defined FM broadcasting; But additional digital sidebands smaller bandwidth is mainly used in the auxiliary data message of transmission, and can not be transmitting digitized analog audio information.And be separated with 100kHz, 200kHz, 300kHz, 500kHz and 600kHz etc. between present domestic actual FM frequency, the frequency operating position is complicated, still has the dummy frequencies resource to be underutilized.Existing digital audio broadcasting technology is inapplicable in China.But through making full use of of FM Digital Realization tuned radio frequency is greatly replenishing of frequency-modulation broadcasting.Therefore, need a kind of new time domain to mix repeatedly in-band on-channel (Time Domain Overlapping-In Band On Channel, TDO-IBOC) the corresponding transmitting apparatus of modulus sound broadcasting signal, flourish with the audio broadcasting that promotes China.
(3) utility model content
The purpose of the utility model is to propose the transmitting apparatus that a kind of time domain is mixed the digital-to-analogue audio broadcast signal of in-band on-channel repeatedly; In time domain, be mixed into one road signal to simulated sound broadcast singal and digital audio broadcast singal by certain way, and in frequency domain a real shared fm broadcast channel.Need not repartition frequency spectrum, frequency spectrum is fully used, save frequency spectrum resource, and at receiving terminal thoroughly separation simulation sound broadcasting signal and digital broadcast signal.
The transmitting apparatus of the digital-to-analogue audio broadcast signal of the in-band on-channel of the utility model design comprises simulated sound modulation module, digital signal modulation module, mixing module, digital to analog converter, up-conversion module, power amplifier and antenna-feedback system,
By the simulated sound modulation module of required frequency range generation simulated sound broadcast singal, its input is connected to external audio source; The input that produces the digital signal modulation module of digital signal by the identical frequency range of simulated sound broadcast singal is connected to external audio source and/or data source; The input of mixing module is connected to the output of simulated sound modulation module and the output of digital modulation module, and the output of mixing module is connected to digital to analog converter; The output of digital to analog converter is connected to up-conversion module; The output of up-conversion module is connected to power amplifier; The output of power amplifier is sent into antenna-feedback system and is launched by antenna.
Said digital signal modulation module comprises precoding unit, multiplexed unit and digital modulator; Multi-channel analog or digital audio and video signals and data flow insert 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 treatment unit, time domain copied cells; The code stream of input inserts scrambler, sends into the constellation mapping unit behind the channel encoder, simultaneously, synchronize data of system and control data, also the channel encoder is sent into the constellation mapping unit respectively; The output of each constellation mapping unit and pilot signal connect the time domain copied cells through becoming frame unit, OFDM modulation treatment unit, and the time domain copied cells duplicates time-domain digital signal d in two one group adjacent signals frame
m, the output of time domain copied cells is the output of digital signal modulation module, inserts mixing module.
Said mixing module comprises a subtracter and adder, respectively the digital signal d that repeats on the adjacent signals frame
mSimulated sound broadcast singal x with corresponding digitalization
2m, x
2m-1Add and subtract the mixed signal S=(x of a shared broadcasting channel of output mutually
0-d
0, x
1+ d
0... ..x
2m-d
m, x
2m+1+ d
m... ..).
Said simulated sound modulation module is an analog fm sound radio modulation module, and said digital signal modulation module is digital audio and/or data broadcasting modulation module.
Said simulated sound modulation module contains Direct Digital Frequency Synthesizers.
Said digital signal modulation module comprises precoding unit, multiplexed unit and digital modulator; Multi-channel analog and/or digital audio and video signals and data flow insert 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 treatment unit, time domain copied cells; The code stream of input inserts scrambler, sends into the constellation mapping unit behind the channel encoder, simultaneously, synchronize data of system and control data, also the channel encoder is sent into the constellation mapping unit respectively; The output of each constellation mapping unit and pilot signal connect the time domain copied cells through becoming frame unit, OFDM modulation treatment unit, and the output of time domain copied cells is the output of digital signal modulation module.
The Fourier transform length of described OFDM modulation treatment unit is any in 256,512,1024 and 2028.
Described channel encoder is LDPC sign indicating number error correction coding unit.
Said simulated sound modulation module and digital signal modulation module output signal common channel are fm broadcast channel.
The advantage of the transmitting apparatus of the digital-to-analogue audio broadcast signal of the utility model in-band on-channel is: 1, in a broadcasting channel; The method and the corresponding apparatus of the overlapping fully analog-digital blended signal of generation simulated sound broadcast singal and digital signal frequency spectrum have been proposed; Keep compatible at transmitting terminal and existing analog broadcast channel, need not repartition frequency spectrum; Frequency spectrum is fully used, has saved frequency spectrum resource; 2, the analog-digital blended signal of this equipment transmission is convenient to the receiving terminal separation, can eliminate the mutual interference mutually of simulated sound broadcast singal and digital signal, realizes the good reduction of simulated sound broadcast singal and digital signal.
(4) description of drawings
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 main channel and the first adjacent channel frequently mutual interference sketch map mutually of IBOC-FM.
Fig. 6 is Chinese frequency modulation spectrum allocation may sketch map.
Fig. 7 is the transmitting apparatus embodiment gained analog-digital blended signal frequency modulation channel spectrum diagram of the digital-to-analogue audio broadcast signal of this in-band on-channel.
Fig. 8 is the time domain adjacent signals frame reproduction digital signal sketch map of transmitting apparatus embodiment of the digital-to-analogue audio broadcast signal of this in-band on-channel.
Fig. 9 is the transmitting apparatus example structure block diagram of the digital-to-analogue audio broadcast signal of this in-band on-channel.
(5) embodiment
To combine accompanying drawing that the specific embodiment of the utility model is described in detail below.
The transmitting apparatus embodiment of this in-band on-channel digital-to-analogue audio broadcasting is as shown in Figure 9, comprises analog fm modulation module, digital signal modulation module, mixing module, digital-to-analogue (D/A) transducer, up-conversion module, power amplifier, antenna-feedback system and antenna.
The analog fm modulation module produces digitized analog fm modulation signal X
FM=(x
0, x
1... x
m), its output is by the length N segmentation, and its input is connected to external audio source, and output is connected to mixing module; The digital audio modulation module produces and digital signal d
m, its input is connected to external audio source and data source, and output is connected to mixing module; Mixing module comprises a subtracter and adder, respectively the digital signal d that repeats on the adjacent signals frame
mAnalog fm signal x with corresponding digitalization
2m, x
2m-1Add and subtract mutually, thus digitized analog fm modulation signal x
mWith digital signal d
mDigital-to-analogue mixed signal S=(the x that mixes
0-d
0, x
1+ d
0... ..x
2m-d
m, x
2m+1+ d
m... ..), perhaps S=(x
0+ d
0, x
1-d
0... ..x
2m+ d
m, x
2m+1-d
m... ..), the shared fm broadcast channel of digitized analog fm modulation signal and digital signal in the digital-to-analogue mixed signal of its output, their frequency spectrum is overlapping fully, and is as shown in Figure 7.The output linking number weighted-voltage D/A converter of mixing module becomes analog signal s (t) to digital signal, is connected to up-conversion module then; Up-conversion module is moved radio frequency to mixed 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 amplifying mixed signal, launches through antenna.
Said analog fm modulation module is an analog fm sound modulation module; Be modulated to FM signal to the voice signal of input according to analog fm broadcast technology standard, the technic relization scheme of analog fm modulation is a lot, and analog fm sound modulation module contains Direct Digital synthesizer (Direct Digital Synthesis in the present embodiment; DDS); Realize the modulation of analoging sound signal frequency modulation, convert modulation signal into digital signal, with the frequency control word of this Digital Signals DDS; Form the time-discrete sine wave that output frequency receives analog signal control, thereby obtain the modulating signal of frequency modulation X of time discrete (digitlization)
FM=(x
0, x
1...).
Said digital signal modulation module comprises precoding unit, multiplexed unit and digital modulator.Multi-channel analog or digital audio and video signals and data flow insert precoding unit; Precoding unit comprises A/D converter, preaccentuator, condensing encoder etc.; With various input audio frequency with send into multiplexed unit after Data Stream Processing becomes digital transmission form; All data flow that multiplexed unit will receive and audio frequency are combined into a code stream, give digital modulator then.
Digital modulator comprises scrambler, channel encoder, constellation mapping unit, becomes frame unit, OFDM modulation treatment unit (OFDM unit), time domain copied cells.The code stream of input inserts scrambler and carries out randomization, realizes energy dissipation, and the channel encoder carries out sending into the constellation mapping unit after the channel error correction coding.Simultaneously, synchronize data of system and control data are also sent into the constellation mapping unit through similar channel encoder respectively; The output of each constellation mapping unit and pilot signal are through becoming frame unit, OFDM modulation treatment unit, and so far digital signal has been accomplished chnnel coding and modulation, has obtained time-domain digital signal d
mInsert the time domain copied cells then, in two one group adjacent signals frame, duplicate time-domain digital signal d
m(as shown in Figure 8) given mixing module then.
The Fourier transform length of this routine described OFDM modulation treatment unit is any in 256,512,1024 and 2028.
The channel error correction coding of channel encoder has adopted the serially concatenated error correcting code in the present embodiment, and ISN adopts convolution code, and its female sign indicating number is that code check is 1/2 convolution code, and generator polynomial is (171
Otc, 131
Otc), handle reliability enhanced deleting through forced (puncturing), obtain the convolution code of other code check, for example 2/3,3/4,5/6 and 7/8; Outer sign indicating number employing loe-density parity-check code (Low Density Parity Check, LDPC); Channel encoder is followed an interleaver, and is discrete for random error the continuous error code of burst, drops within the error correcting capability scope.
In the constellation mapping unit, the data after the completion error correction coding carry out quaternary PSK modulation (QPSK) or/and the sign map of multiple qam digital modulation (mQAM).
For be convenient to realize at receiving terminal carrier wave recover, various synchronously, regularly recovery, phase noise tracking, transmission mode identification, planisphere type identification, channel estimating and equilibrium etc.; In the subcarrier of OFDM cells modulate, suitably insert pilot tone (pilot) signal; It is high that the power of the power ratio digital signal of pilot signal is wanted; Be easy to detect pilot signal so that receive end; Pilot tone is divided into the CP continuous pilot that inserts continuously at some subcarrier and disperses the scattered pilot that inserts by certain pattern, pilot tone adopts in the present embodiment be certain-length binary pseudo-random sequence (Pseudo-Random Binary Sequence, PRBS).
The output of each constellation mapping unit is sent into into frame unit with pilot signal; Get up to form signal frame in different business data centralizations such as this audio frequency and data flow, synchrodata, control data, pilot tones; Signal frame is sent into OFDM modulation treatment (OFDM) unit, through inverse Fourier transform, and places on the corresponding OFDM time frequency grid; Be on the subcarrier of different time different frequency, obtain the frequency spectrum of digital signal.Between each OFDM symbol of digital signal, insert protection (Guard Interval at interval then; GI); In the present embodiment, Cyclic Prefix OFDM (Cyclic Prefix OFDM, CP-OFDM) mode have been adopted; In GI, put into a Cyclic Prefix, become the cycle expansion of an OFDM symbol.
On base of digital simulation, each module of this transmitting apparatus can edit gate array (FPGA) with the scene and digital signal processor (DSP) is accomplished, and actual effect is good.
The foregoing description is merely concrete example of purpose, technical scheme and beneficial effect further explain to the utility model, and the utility model is not to be defined in this.All any modifications of within the scope of disclosure of the utility model, being made, be equal to replacement, improvement etc., all be included within the protection range of the utility model.
Claims (3)
1. the transmitting apparatus of in-band on-channel digital-to-analogue audio broadcast signal is characterized in that:
Comprise simulated sound modulation module, digital signal modulation module, mixing module, digital to analog converter, up-conversion module, power amplifier and antenna-feedback system,
By the simulated sound modulation module of required frequency range generation simulated sound broadcast singal, its input is connected to external audio source; The input that produces the digital signal modulation module of digital signal by the identical frequency range of simulated sound broadcast singal is connected to external audio source and/or data source; The input of mixing module is connected to the output of simulated sound modulation module and the output of digital signal modulation module, and the output of mixing module is connected to digital to analog converter; The output of digital to analog converter is connected to up-conversion module; The output of up-conversion module is connected to power amplifier; The output of power amplifier is sent into antenna-feedback system and is launched by antenna;
Said digital signal modulation module comprises precoding unit, multiplexed unit and digital modulator; Multi-channel analog or digital audio and video signals and data flow insert 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 treatment unit, time domain copied cells; The code stream of input inserts scrambler, sends into the constellation mapping unit behind the channel encoder, simultaneously, synchronize data of system and control data, also the channel encoder is sent into the constellation mapping unit respectively; The output of each constellation mapping unit and pilot signal connect the time domain copied cells through becoming frame unit, OFDM modulation treatment unit, and the time domain copied cells duplicates time-domain digital signal d in two one group adjacent signals frame
m, the output of time domain copied cells is the output of digital signal modulation module, inserts mixing module;
Said mixing module comprises a subtracter and adder, respectively the digital signal d that repeats on the adjacent signals frame
mSimulated sound broadcast singal x with corresponding digitalization
2m, x
2m-1Add and subtract the shared fm broadcast channel of the mixed signal of output mutually.
2. the transmitting apparatus of in-band on-channel digital-to-analogue audio broadcast signal according to claim 1 is characterized in that:
Said simulated sound modulation module contains Direct Digital Frequency Synthesizers.
3. the transmitting apparatus of in-band on-channel digital-to-analogue audio broadcast signal according to claim 1 is characterized in that:
The Fourier transform length of described OFDM modulation treatment unit is any in 256,512,1024 and 2028.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202845733U CN202406103U (en) | 2011-08-06 | 2011-08-06 | Transmitting apparatus for in-band on-channel digital-analog audio frequency broadcast signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202845733U CN202406103U (en) | 2011-08-06 | 2011-08-06 | Transmitting apparatus for in-band on-channel digital-analog audio frequency broadcast signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202406103U true CN202406103U (en) | 2012-08-29 |
Family
ID=46703717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202845733U Withdrawn - After Issue CN202406103U (en) | 2011-08-06 | 2011-08-06 | Transmitting apparatus for in-band on-channel digital-analog audio frequency broadcast signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202406103U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394739A (en) * | 2011-08-06 | 2012-03-28 | 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 |
| CN102970087A (en) * | 2012-11-28 | 2013-03-13 | 苏州威士达信息科技有限公司 | Digital spectrum detection method for in-band on-channel (IBOC) system based on ear perception |
| CN103220251A (en) * | 2013-03-18 | 2013-07-24 | 桂林市思奇通信设备有限公司 | Improved method for generating in-band on-channel digital-analog audio broadcasting signals |
| CN103457615A (en) * | 2013-08-16 | 2013-12-18 | 奥维通信股份有限公司 | Audio broadcasting frequency modulation transmitter based on digital-analog networking |
| WO2019095554A1 (en) * | 2017-11-17 | 2019-05-23 | 深圳思凯微电子有限公司 | Device and method for digital-analog broadcast signal path combining |
-
2011
- 2011-08-06 CN CN2011202845733U patent/CN202406103U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394739A (en) * | 2011-08-06 | 2012-03-28 | 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 |
| 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 |
| CN102970087A (en) * | 2012-11-28 | 2013-03-13 | 苏州威士达信息科技有限公司 | Digital spectrum detection method for in-band on-channel (IBOC) system based on ear perception |
| CN102970087B (en) * | 2012-11-28 | 2014-10-29 | 苏州威士达信息科技有限公司 | Digital spectrum detection method for in-band on-channel (IBOC) system based on ear perception |
| CN103220251A (en) * | 2013-03-18 | 2013-07-24 | 桂林市思奇通信设备有限公司 | Improved method for generating in-band on-channel digital-analog audio broadcasting signals |
| CN103220251B (en) * | 2013-03-18 | 2015-10-14 | 深圳思凯微电子有限公司 | The in-band on-channel digital-analog audio frequency broadcast signal generating method improved |
| CN103457615A (en) * | 2013-08-16 | 2013-12-18 | 奥维通信股份有限公司 | Audio broadcasting frequency modulation transmitter based on digital-analog networking |
| WO2019095554A1 (en) * | 2017-11-17 | 2019-05-23 | 深圳思凯微电子有限公司 | Device and method for digital-analog broadcast signal path combining |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102394739B (en) | Generation method and transmitting equipment for in band on channel (IBOC) digital/analog audio broadcast signals | |
| CN102142852B (en) | Method and equipment for transmitting digital-analog audio broadcasting | |
| CN102307168B (en) | Separation method and receiving device of digital broadcasting analog-to-digital (A/D) signal at frequency modulation (FM) broadcast band | |
| CN102394714B (en) | Method and system for receiving digital broadcasting signals in frequency modulation (FM) broadcast bands | |
| CN202406103U (en) | Transmitting apparatus for in-band on-channel digital-analog audio frequency broadcast signal | |
| CN100525272C (en) | Ground mobile multimedia broadcast receiving and transmitting method and systme based on free DAB | |
| CN102694764B (en) | Digital audio and video signals method of sending and receiving and device in digital audio broadcast system | |
| US8041292B2 (en) | Network radio receiver | |
| JP4105374B2 (en) | Method and apparatus for identifying orthogonal frequency division multiplexing (OFDM) terrestrial repeaters using unused subcarriers | |
| US7957478B2 (en) | Radio signal generator | |
| JP2008125088A (en) | Method and apparatus for amplitude modulation compatible digital broadcasting | |
| TWI247500B (en) | Multiple transmission/reception orthogonal frequency division multiplexing systems and methods | |
| JP2000115116A (en) | Orthogonal frequency division multiplex signal generator, orthogonal frequency division multiplex signal generation method and communication equipment | |
| CN100579102C (en) | Method for applying layer modulation technique in T-MMB system | |
| US9379918B1 (en) | System and method for increasing throughput in digital radio broadcast receiver | |
| CN202085153U (en) | Transmitting device for digital-analog audio frequency broadcast | |
| CN102957662B (en) | Segmentation modulator approach in the band of FM broadcasting band number analog/mixed signal | |
| CN101582740A (en) | Transmitting device, transmitting method and transmitting system for digital broadcast signal | |
| CN202309690U (en) | Frequency modulation broadcast frequency range digital broadcast signal receiving system | |
| CN103220251B (en) | The in-band on-channel digital-analog audio frequency broadcast signal generating method improved | |
| CN103001912B (en) | The self adaptation band internal modulation method of FM broadcasting band number analog/mixed signal | |
| Boström | An FPGA implementation of a digital FM modulator. | |
| Bilbao | Dab Transmission System Simulation | |
| CN101707584B (en) | Method for applying hierarchical modulation technology in T-MMB system | |
| CN102088330A (en) | Method and device for generating terminal test signal of CMMB system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120829 Effective date of abandoning: 20140312 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20120829 Effective date of abandoning: 20140312 |