CN1794592A - Portable terminal possessing digital audio broadcasting (DAB) receiving function - Google Patents
Portable terminal possessing digital audio broadcasting (DAB) receiving function Download PDFInfo
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Abstract
This invention discloses a portable terminal with a digit audio broadcast and receiving function including: a control module for controlling the operation of the whole terminal, a storage module connected with the control module, a man-machine interface, an audio process module and a supply module characterizing in also including a RF module connected with the control module and a DAB module connected with the RF module and receiving digital audio broadcast signals sent by the RF module and sending the processed broadcast signals to said audio process module for play on a loudspeaker.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to a kind of portable terminal device with digital audio broadcasting (DAB) receiving function.
Background technology
Digital audio broadcasting (DAB, Digital Autio Broadeasting) technology is the third generation broadcast technology that grows up after AM and FM audio broadcasting technology, it high-quality and efficient source coding technique with anti-echo transmission channel coding technological synthesis be in the same place, have the following advantages:
The transmission system performance is good, can eliminate the noise in the transmission course and the accumulation of distortion, and the mistake that occurs in the transmission can be corrected; Needed transmitting power is little, helps energy savings and reduces electromagnetic pollution; Transmission system allows the Synchronization Network operation, has improved the spectrum utilization rule, is beneficial to the broadcasting that realizes a channel multiple programs and multiple business; Fixedly reception also can portable reception and move and receive, and moves the quality that receives and has reached the CD-DA quality; Can provide high-quality, dual track, multichannel sterego broadcasting, its subjective quality and CD disc indifference; The power efficiency height; Transmitter power has only the 1/100-1/10 of FM transmitter, saves power supply and has reduced environmental impact; The realization Single Frequency Network covers, and can save frequency resource, covers effective performance and reaches 95%, and time validity is 99%; Can transmit additional information etc.
Therefore, along with the development of digital information technology, digital audio broadcasting replaces present AM or FM broadcasting just gradually.
The emission system structure diagram of digital audio broadcasting as shown in Figure 1, as can be seen from the figure this system comprises studio source encoding and Channel Processing two large divisions.The studio source encoding partly comprises L, R sound channel, the A/D converter, and the source encoding of L, R sound channel, multiplexed etc.
Multiplexed except that multiplexing the voice data of left and right acoustic channels, also also being in the same place program category signal and additional information signal are multiplexing.Channel Processing partly comprises circuit such as program multiplexer, channel encoder, modulator and radio-frequency (RF) power amplification.The program multiplexer is that the multi-path digital audio signal is together multiplexing.Chnnel coding comprises measures such as error correction coding and data interlacing, and these measures can improve the antijamming capability of signal in transmission course.
In the studio, stereophonic program left and right sound channels signal at first is converted to digital signal, handle the also code check of compressed signal through source encoding, add additional signal then, format with voice data again, a signal in the stereophonic signal is delayed time, so that be used for sheltering the loss of signal in the emission in receiver, the multiple programs that is sent to transmitting station synthesizes multiplexing signal in the program multiplexer again.
At present, the DABDAB module on the vehicle occurs being used in, utilized this DAB module, people can listen to the program of digital audio broadcasting, still, if can utilize mobile phone of oneself or PDA to wait and listen to digital audio broadcasting, will be very convenient, also bring bigger enjoyment for life.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of portable terminal device with digital audio broadcasting (DAB) receiving function, the user can utilize this portable terminal device to remove to receive the digital audio broadcasting program;
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of portable terminal device with digital audio broadcasting receiving function, comprise: the control module of control whole terminal normal operation, it is the core of whole device, and the memory module that links to each other with control module, man-machine interface, audio processing modules and power module; Its characteristics are,
Also comprise a RF module that links to each other with control module and
A DAB module,
Described DAB module links to each other with above-mentioned RF module, receive the digital audio broadcasting signal that the RF module sends over, simultaneously, described DAB module is subjected to the control of above-mentioned control module, the digital audio broadcasting signal after handling is sent to above-mentioned audio processing modules be used for playing at loud speaker.
Further, also comprise a LCD module that links to each other with control module, be used to carry out video and show;
Further, described DAB module links to each other with above-mentioned LCD module, sends vision signal to described LCD module;
Further, described portable terminal device with digital audio broadcasting receiving function comprises an AM/FM tuner module, and it receives AM that the RF module sends over or FM signal and described signal is handled under the control of above-mentioned control module;
Further, described portable terminal device is mobile phone or PDA or MP3;
Further, the signal of described DAB module reception is the signal of VHF wave band;
Further, the signal that described DAB module receives is the signal of L-band, and is the signal of VHF wave band with the signal transformation of L-band;
Further, described control module comes the DAB module is realized control command processing, tuning control, zero-signal detection, Synchronization Control, audio frequency control, subchannel selection by the uC interface;
Further, described DAB module also has a DAB module data interface RDI, realizes the exterior storage from the decoded data of DAB signal;
Further, described DAB module has according to the optional two-way I2C interface of system's control needs;
Further, the digital audio interface by the I2S form carries out transfer of data between described DAB module and the described apparatus for processing audio.
The contrast prior art the invention has the advantages that,
Portable terminal device with digital audio broadcasting receiving function of the present invention, in common mobile communication terminal structure, increased and carried out the correlation module that digital audio broadcasting receives, make portable terminal device except that carrying out common communication function, can also receive digital audio broadcasting signal, in order to listen to digital audio broadcasting, for the user provides a new information channel, and realize one-object-many-purposes, also make multimedia technology on this equipment, obtain sufficient more embodiment; In addition, device of the present invention not only can receive digital audio broadcasting signal, also can receive AM or FM signal well, and this also adapts to the trend of following digital audio broadcasting fully.
Above and other objects of the present invention, feature and advantage are from below in conjunction with accompanying drawing be not will become more obvious the specific descriptions of certain embodiments.
Description of drawings
Fig. 1 is the emission system structure diagram of digital audio broadcasting;
Fig. 2 is the structure diagram of mobile communication terminal of the present invention;
Fig. 3 is the structure diagram of mobile communication terminal embodiment one of the present invention;
Fig. 4 is the structure diagram of mobile communication terminal embodiment two of the present invention;
Fig. 5 is the structure diagram of mobile communication terminal embodiment three of the present invention;
Fig. 6 is the principle sketch of DAB module of the present invention;
Fig. 7 is a DAB module medium-high frequency partial circuit calcspar of the present invention;
Fig. 8 is the circuit block diagram of COFDM demodulator in the DAB module of the present invention;
Fig. 9 is the circuit block diagram of source decoder in the DAB module of the present invention.
Embodiment
In the following description, known function or structure will no longer describe in detail, to avoid there be unnecessary obscuring with content of the present invention.
As shown in Figure 2, it is the structure diagram of mobile communication terminal of the present invention, the normal operation of control module 1 control whole terminal, it is the core of whole device, what link to each other with control module 1 has memory module 9, man-machine interface 8, audio processing modules 6 and a power module 4; Also comprise a RF module 3 that links to each other with control module 1, with a DAB module 2, described DAB module 2 links to each other with above-mentioned RF module 3, receive the digital audio broadcasting signal that RF module 3 sends over, simultaneously, described DAB module 2 is subjected to the control of above-mentioned control module 1, the digital audio broadcasting signal after handling is sent to above-mentioned audio processing modules 6 be used for playing at loud speaker.
As shown in Figure 3, structure diagram for mobile communication terminal embodiment one of the present invention, control module 1 is the core of whole device, its control mobile device whole operation links to each other with SIM card (Subscriber Identity Module Subscriber Identity Module) 5, memory module 9, man-machine interface 8, audio processing modules 6, LCD module 7 and radio-frequency module 3; The power configuration of a whole device of power module 4 management; Memory module 9 is used for storing the data that mobile device need be stored; Man-machine interface 8 is man-machine interface interfaces of user and this device, and the user is used for finishing the various operations that need; The voice signal of the coding that audio processing modules 6 demodulation receive from RF module 3 and the voice signal that demodulation is provided be to loud speaker, and coding from the electroacoustic signal of microphone (not shown) and voice signal through coding is provided to RF module 3; LCD module 7 is used to show the basic operation state of portable terminal device, and the image file in the terminal is shown.
Simultaneously, also comprise a DAB module 2, described DAB module 2 links to each other with above-mentioned RF module 3, receive the digital audio broadcasting signal that RF module 3 sends over, simultaneously, described DAB module 2 is subjected to the control of above-mentioned control module 1, and the digital audio broadcasting signal after handling is sent to above-mentioned audio processing modules 6, is used for playing at loud speaker.
Fig. 4 is the structure diagram of another embodiment of mobile communication terminal of the present invention, originally is implemented on the basis of embodiment one, and DAB module 2 links to each other with LCD module 7, and the videos such as picture that are used for the DAB module is received and parses show;
Fig. 5 is the structure diagram of mobile communication terminal embodiment three of the present invention, originally be implemented on embodiment one and two the basis, further comprise an AM/FM tuner module 10, it is under the control of above-mentioned control module 1, receive AM that RF module 3 sends over or FM signal and described signal is handled, to realize listening to AM or FM program;
Fig. 6 is the principle sketch of DAB module of the present invention, is to handle and provide the audio broadcasting program good and data service at last according to forming the opposite order that transmits with transmitting terminal to the reception of DAB signal as can be seen from Figure.HFS (tuner) at first from the frequency range of distributing to the DAB use, is selected the frequency chunks of needed transmission sound programme and data service, and the combination of all business that transmit on this frequency chunks is called ensemble; Carry out frequency translation then, high-frequency signal is become intermediate-freuqncy signal and baseband signal.As shown in Figure 7, being DAB module medium-high frequency partial circuit calcspar of the present invention, in order to receive the signal of L-band, need be the signal of VHF wave band with the signal transformation of L-band, and the local oscillator of DAB module is used phase-locked loop (PLL).No matter be VHF signal that directly receives or the VHF signal that comes by the L-band conversion, after selecting, all send into frequency mixer, become intermediate-freuqncy signal, by the filtering of intermediate frequency selective filter, curb useless spectrum component, to guarantee promptly as under strong audio frequency road disturbed condition, also can well receive.Then, intermediate-freuqncy signal is again through frequency translation and filtering, and it is the baseband signal of 2.048MHZ that centre frequency is provided, and sends into the COFDM demodulator and continues to handle.
Fig. 8 is the circuit block diagram of COFDM demodulator in the DAB module of the present invention, and the DAB baseband signal is sent into COFDM demodulator shown in Figure 7, with the transmission composite signal that obtains to form by recombiner corresponding to transmitting terminal.For this reason, at first from the COFDM baseband signal, produce in-phase component (I) and quadrature component (Q) by quadrature demodulator, be transformed into the signal of digital form then respectively through the A/D converter, the acquisition bit sequence relends and helps digital signal processor, implement fast Fourier transform, promptly offset the Fast Fourier Transform Inverse or the discrete fourier inverse transformation of transmitting terminal, finished the 4PSK demodulation of each carrier wave, recovered the differential coding plural number bit data flow that is distributed on each carrier wave again.
Because the DAB signal transmits frame by frame, with the form of FFT to the demodulation of COFDM baseband signal before, the DAB module should be by the nil symbol of transmission frame, realizes each transmission frame thick time synchronized of the zero hour.Turn-off owing to during nil symbol, be equivalent to transmitter, therefore, just can detect according to power and to represent each frame to begin the nil symbol of (separating each frame in other words).Find out nil symbol, also just realized synchronously thick to the DAB signal of DAB module time reference.
The bit stream of each transmission frame that forms after Difference Solution is subdivided into synchronizing channel, fast information channel in dab receiver and MSC data in separating recombiner.In separating recombiner, the data based MCI that transmits in FIC in the main business MSC is divided into the logical frame of each subchannel.Guarantee clock recovery by SC; Corresponding with the originating terminal signal processing, in the DAB module, and then the frequency deinterleaving is being carried out after the differential ference spiral; Then, in channel-decoding-Viterbi decoder, the volume of transmitting terminal signal encoding application is knitted coding decode accordingly, regain the data flow of source code; The bit stream of channel decoding is transferred into a descrambler, and energy dissipation or the scrambling implemented at transmitting terminal are recovered again.
For the sound radio program, the source decoder in the DAB module be the signal with data compression to revert to data transfer rate again be the PCM signal, become to be suitable for the bit sequence resetting and store.After the decoding of source, again through the D/A conversion, the voice signal of sending simulation is for using.Need to prove, except the data flow of sound voice signal, to also have the stream of the data service relevant with program at the source decoder.Therefore, should consider two outputs, as shown in Figure 9, be the circuit block diagram of source decoder in the DAB module of the present invention.Simultaneously, also must decode to the PAD data flow, and depend on actual data service structure, the function of PAD decoder is controlled by fast information channel in dab receiver.
So far, the solution of the present invention is able to complete description, but the portable terminal device with digital audio broadcasting receiving function of the present invention, be not restricted to listed utilization in specification and the execution mode, it can be applied to various suitable the present invention's field fully, for those skilled in the art, can easily realize additional advantage and make amendment, therefore under the situation of the spirit and scope of the universal that does not deviate from claim and equivalency range and limited, the present invention is not limited to specific details, representational equipment and the examples shown that illustrates here and describe.
Claims (11)
1, a kind of portable terminal device with digital audio broadcasting receiving function, comprise: the control module of control whole terminal normal operation, it is the core of whole device, and the memory module that links to each other with control module, man-machine interface, audio processing modules and power module; It is characterized in that,
Also comprise a RF module that links to each other with control module and
A DAB module,
Described DAB module links to each other with above-mentioned RF module, receive the digital audio broadcasting signal that the RF module sends over, simultaneously, described DAB module is subjected to the control of above-mentioned control module, the digital audio broadcasting signal after handling is sent to above-mentioned audio processing modules be used for playing at loud speaker.
2, portable terminal device according to claim 1 also comprises a LCD module that links to each other with control module, is used to carry out video and shows.
3, portable terminal device according to claim 1, described DAB module links to each other with above-mentioned LCD module, sends vision signal to described LCD module.
4, according to claim 1 or 2 or 3 described portable terminal devices, described portable terminal device with digital audio broadcasting receiving function comprises an AM/FM tuner module, it receives AM that the RF module sends over or FM signal and described signal is handled under the control of above-mentioned control module.
5, according to claim 1 or 2 or 3 described portable terminal devices, described portable terminal device is mobile phone or PDA or MP3 device.
6, according to claim 1 or 2 or 3 described portable terminal devices, the signal that described DAB module receives is the signal of VHF wave band.
7, according to claim 1 or 2 or 3 described portable terminal devices, the signal that described DAB module receives is the signal of L-band, and is the signal of VHF wave band with the signal transformation of L-band.
8, according to claim 1 or 2 or 3 described portable terminal devices, described control module comes the DAB module is realized control command processing, tuning control, zero-signal detection, Synchronization Control, audio frequency control, subchannel selection by the uC interface.
9, according to claim 1 or 2 or 3 described portable terminal devices, described DAB module also has a DAB module data interface RDI, realizes the exterior storage from the decoded data of DAB signal.
10, according to claim 1 or 2 or 3 described portable terminal devices, described DAB module has according to the optional two-way I2C interface of system's control needs.
11, according to claim 1 or 2 or 3 described portable terminal devices, the digital audio interface by the I2S form between described DAB module and the described apparatus for processing audio carries out transfer of data.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2005100034263A CN1794592A (en) | 2005-12-31 | 2005-12-31 | Portable terminal possessing digital audio broadcasting (DAB) receiving function |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2005100034263A CN1794592A (en) | 2005-12-31 | 2005-12-31 | Portable terminal possessing digital audio broadcasting (DAB) receiving function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810100A (en) * | 2011-06-02 | 2012-12-05 | 汉王科技股份有限公司 | Method and system for acquiring information by electronic reader |
| CN104079363A (en) * | 2012-12-19 | 2014-10-01 | Nxp股份有限公司 | Time modification system, system for blending signals and method used for time modified input signal |
| CN105072265A (en) * | 2015-07-29 | 2015-11-18 | 北京海尔集成电路设计有限公司 | Mobile terminal with China digital radio broadcasting (CDR) receiving function |
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2005
- 2005-12-31 CN CNA2005100034263A patent/CN1794592A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810100A (en) * | 2011-06-02 | 2012-12-05 | 汉王科技股份有限公司 | Method and system for acquiring information by electronic reader |
| CN104079363A (en) * | 2012-12-19 | 2014-10-01 | Nxp股份有限公司 | Time modification system, system for blending signals and method used for time modified input signal |
| CN104079363B (en) * | 2012-12-19 | 2017-04-12 | Nxp股份有限公司 | Time modification system, system for blending signals and method used for time modified input signal |
| CN105072265A (en) * | 2015-07-29 | 2015-11-18 | 北京海尔集成电路设计有限公司 | Mobile terminal with China digital radio broadcasting (CDR) receiving function |
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