CN101262571A - A decoding method for digital multimedia broadcast receiver - Google Patents
A decoding method for digital multimedia broadcast receiver Download PDFInfo
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- CN101262571A CN101262571A CNA2008100200727A CN200810020072A CN101262571A CN 101262571 A CN101262571 A CN 101262571A CN A2008100200727 A CNA2008100200727 A CN A2008100200727A CN 200810020072 A CN200810020072 A CN 200810020072A CN 101262571 A CN101262571 A CN 101262571A
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Abstract
The invention discloses a decoding method used for a digital multimedia broadcast receiver. The decoding method comprises the steps of: firstly, transforming an intermediate-frequency signal of a simulated digital multimedia broadcast into a digital intermediate-frequency signal by an analog-to-digital converter; secondly, carrying out the separation of IQ component to the digital intermediate-frequency signal by utilizing the method of digital filtering and then carrying out filtering so as to obtain an orthogonal frequency division multiplexing time domain signal in plural form; thirdly, calculating the orthogonal frequency division multiplexing time domain signal in the plural form by FFT to obtain the sampling points of each sub-carrier and form a code orthogonal frequency division multiplexing signal after the completion of frequency de-interleaving; fourthly, carrying out high-speed quadrature differential phase shift keying demodulation to the code orthogonal frequency division multiplexing signal and completing time de-interleaving; fifthly, using a Viterbi decoder of a digital multimedia broadcast baseband decoder to carry out channel decoding to the signal treated with the high-speed quadrature differential phase shift keying demodulation by a channel decoder so as to recover the original data of the digital multimedia broadcast; sixthly, treating the original data by a display device.
Description
Technical field
The present invention relates to a kind of coding/decoding method that is used for digital multimedia broadcast receiver, particularly be applied to the coding/decoding method on the decoding chip of digital multimedia broadcast receiving apparatus.
Background technology
Conventional wireless electricity broadcast system is the analogue system that receives at fixed form, be to transmit between this system by analog signal, but because the reliability of analog signal is relatively poor, the sensitivity that receives is lower, poor anti jamming capability, therefore transmitting power is had relatively high expectations, if power is lower, correspondingly the coverage rate of signal is just little, therefore just need to build the output that large-scale power base station improves power, the energy and cost of manufacture have so just been wasted, therefore adopt digital multimedia broadcasting system to seem particularly important, and, put to no little inconvenience for the promotion and application of digital multimedia broadcasting system at present not to the coding/decoding method that carries out of digital multimedia broadcast receiver.
Summary of the invention
The invention provides a kind of coding/decoding method that is used for digital multimedia broadcast receiver, it can be decoded to digital multimedia broadcasting signal effectively, makes it meet the requirement of broadcast.
The present invention has adopted following technical scheme: a kind of coding/decoding method that is used for digital multimedia broadcast receiver, it may further comprise the steps: the first step, be converted into intermediate-freuqncy signal after at first the signal of DMB being entered the RF module of digital multimedia broadcast receiver, convert intermediate-freuqncy signal to digital medium-frequency signal by analog to digital converter; Second step, utilize digital filtering method that digital medium-frequency signal is carried out the separation of IQ component, the baseband filter by the DMB baseband decoder carries out filtering then, thereby obtains the OFDM time-domain signal of plural form; In the 3rd step, form the Coded Orthogonal Frequency Division Multiplexing (COFDM) signal after the OFDM time-domain signal of plural form calculated the sampling point of each subcarrier and finish the frequency deinterleaving by FFT; In the 4th step, the Coded Orthogonal Frequency Division Multiplexing (COFDM) signal is carried out demodulation of high speed four-phase DPSK and deadline deinterleaving; In the 5th step, carry out channel-decoding with the Viterbi decoder of the DMB baseband decoder signal after with the demodulation of high speed four-phase DPSK by channel decoder, thereby recover the source data of DMB; In the 6th step, above-mentioned source data is handled by display device.
Described OFDM time-domain signal transmits frame by frame.The bit stream of each transmission frame that forms after separation of the present invention's process and the filtering is subdivided into synchronizing channel, fast information channel in dab receiver and MSC data by separating recombiner, the data based MCI that transmits in fast information channel in dab receiver in the MSC is divided into the logical frame of each subchannel, guarantees clock recovery by synchronizing channel.
Of the present invention the 4th the step in before the Coded Orthogonal Frequency Division Multiplexing (COFDM) baseband signal is carried out the frequency deinterleaving, receiver should be by the nil symbol of digital multimedia broadcasting signal transmission frame, realization is to each the transmission frame thick time synchronized zero hour, go out to represent each frame to begin to separate in other words the nil symbol of each frame according to power detection, find out nil symbol, realized synchronously thick to digital multimedia broadcasting signal of receiver time reference.When being audio program, the source data in the 5th step and the 6th step can play by MPEG L2 audio decoder.Source data in the 5th step and the 6th step can process and display by the CPU of outside when being data or video frequency program.DMB baseband decoder of the present invention is provided with digital mixer.Described baseband filter is a digital filter.Described DMB baseband decoder is the DMB baseband decoder of time-sharing work control.
The present invention has following beneficial effect: the present invention is the method to the decoding of digital multimedia broadcast receiver, DMB can transmit sound, image, literal, data and activity video etc., it is with digitized audio signal and various data service signal, under digital state, carry out various codings, modulation, processing such as transmission, because digital signal is in carrying out various processing procedures, has only " 1 " and " 0 " two states, transmit the feature of media self, comprise noise, non-linear distortion etc., all can not change the quality of digital signal, can carry out simultaneously the computing of various numerical operations and various logic coding again easily, improved the Transfer Quality of audio signal, in addition because the high reliability and the high anti-jamming capacity of digital signal transfers, thereby it is higher to improve receiver sensitivity, thereby make and realizing that the broadcasting covering identical with existing FM requires under the situation, its requirement to transmitting power is much lower, increasing substantially of power efficiency saved the energy and reduced the expense that DMB is built platform like this.The modulation technique of digital signal needs very high spectrum efficiency; therefore the present invention adopts the DQPSK modulation to solve the problem that receives that moves; in a television channel 8MHz bandwidth; considered under each path protection situation at interval; can arrange four DMB passages easily; 24 programs can be arranged, the above high-quality audio program of 60 covers can be held basically with present checking station number equally.If consider that again broadcasting some covers requires to hang down the language program of some, then how many program number of broadcasting simultaneously is also.In addition, also there is a key property in DMB, can form single frequency network (SFN) easily utilizes this technology can realize covering with the large tracts of land of content, or even the whole province, nationwide covering, this has also greatly saved frequency resource actually, improved the utilance again of frequency, take all factors into consideration like this, the spectrum efficiency of DMB can be more outstanding, DMB also has anti-multipath to disturb, decline and mobile receiving ability are strong fast, the characteristics that data movement capacity is high.When receiver away from the service area scope since signal too a little less than, the digital multimedia broadcast receiver self check is to there being the appearance of many error codes, and after this error rate reached certain thresholding, receiver can automatically switch to silent mode in order to avoid the appearance of various noises.The present invention can realize DMB (DMB) transmission frame is carried out the full speed decoding, and can carry out the decoding of two passages simultaneously, be particularly suitable for moving and portable equipment of High Data Rate, the DMB standard is supported the data transfer rate up to 1.8Mbps, add the integrated area of the present invention characteristics little, low in energy consumption, so just can improve speed, reduce cost and power consumption.DMB baseband decoder of the present invention is provided with decimation filter, and the precipitous transition band of decimation filter can be eliminated the interference of adjacent channel effectively.The present invention has not only realized the full rate decoding of DMB, and on chip area and power consumption, also obtained important breakthrough, when selecting the low capacity channel, for the channel that need not to decode, comprise that the module of ADC, digital mixer, filter, FFT, DQPSK and Viterbi decoder all will be closed automatically.DMB baseband decoder of the present invention is provided with digital mixer, and the local oscillator of digital mixer is controlled to realize accurate frequency and time synchronized by synchronization module.DMB baseband decoder of the present invention is the DMB decoder of time-sharing work control, it can make the power consumption of digital multimedia broadcast receiver low greatly, the DMB encoder has adopted on time domain multiplexing to multiple programs, can only decode to user selected program, and, have only below 1/3rd of total power dissipation thereby the power consumption of receiver is dropped to unselected program interim " shutdown ".
Description of drawings
Fig. 1 is the block diagram of DMB decoding device of the present invention
Embodiment
In Fig. 1, the present invention is a kind of coding/decoding method that is used for digital multimedia broadcast receiver, it may further comprise the steps: the first step, be converted into intermediate-freuqncy signal after at first the signal of DMB being entered the RF module of digital multimedia broadcast receiver, convert intermediate-freuqncy signal to digital medium-frequency signal by analog to digital converter; Second step, utilize digital filtering method digital medium-frequency signal to be carried out the separation of IQ component, baseband filter by the DMB baseband decoder carries out digital filtering then, the DMB baseband decoder is provided with digital mixer, thereby obtain the OFDM time-domain signal of plural form, through separating and filter the bit stream of each transmission frame that forms after the demodulation, in separating recombiner, be subdivided into synchronizing channel (SC), fast information channel in dab receiver (FIC) and MSC (MSC) data.In separating recombiner, the data based MCI that transmits in FIC (MCI) in the MSC is divided into the logical frame of each subchannel.Guarantee clock recovery by SC.Corresponding with the originating terminal signal processing, in digital multimedia broadcast receiver, and then the frequency deinterleaving is being carried out after the differential ference spiral.Time-interleaved owing to only the logical frame of MSC having been implemented at transmitting terminal, therefore, receiving terminal only carries out corresponding time de-interweaving to the logical frame of MSC, so that bit sequence is reverted to original order again; The 3rd step, the OFDM time-domain signal of plural form is calculated the sampling point of each subcarrier by FFT and finishes frequency deinterleaving formation Coded Orthogonal Frequency Division Multiplexing (COFDM), before the form of utilizing FFT is to the Coded Orthogonal Frequency Division Multiplexing (COFDM) demodulation, receiver should be by the nil symbol of digital multimedia broadcasting signal transmission frame, realization is to each transmission frame thick time synchronized of the zero hour, just can detect according to power and to represent each frame to begin to separate in other words the nil symbol of each frame, find out nil symbol, also just realized receiver time reference synchronously thick to digital multimedia broadcasting signal; In the 4th step, utilize the FFT result calculated to carry out demodulation of high speed four-phase DPSK and deadline deinterleaving; In the 5th step, carry out channel-decoding with the Viterbi decoder of the DMB baseband decoder signal after with the demodulation of high speed four-phase DPSK, thereby recover the DMB source data; In Viterbi decoder, the convolutional encoding that the transmitting end channel coding is used is decoded accordingly, regain the data flow of source code.The bit stream of channel decoding is sent to a descrambler (or claiming to separate energy dispnergy disperser), and energy dissipation or the scrambling implemented at transmitting terminal are recovered again.In the 6th step, these source datas are handled by display device, if can play by MPEG L2 audio decoder when source data is audio program, if can process and display by the CPU of outside when source data is data or video frequency program.
The present invention can realize DMB (DMB) transmission frame is carried out the full speed decoding; and can carry out the decoding of two passages simultaneously; has integrated MPEG L2 audio decoder; FIC information can conduct interviews by outside MCU; has hardware FIB CRC check function; can detect nil symbol and DMB pattern automatically; has synchronous/following function on the sheet; support even error protection (EEP) and inhomogeneous error protection (UEP); support dynamic complex information to reshuffle, man-machine interface (MMI) and data download interface all adopt spi bus and automatic power save function.
The present invention includes digital mixing, synchronous/as to follow the tracks of and demodulation.Baseband decoder can be decoded to the two-way audio in the transmission frame, data or video frequency program simultaneously.Decoded audio program can be play by MPEG L2 audio decoder on the sheet, and data/video frequency program can and show by the further processing of outer CPU.Integrated 1Mb SRAM on the chip.The present invention is particularly suitable for moving and portable equipment of High Data Rate.The DMB standard is supported the data transfer rate up to 1.8Mbps, adds the integrated area of the design characteristics little, low in energy consumption, and the solution of perfect two-forty, low cost, low-power consumption can be provided.The present invention allows the user to choose two programs in the DMB transmission frame to decode simultaneously, and a cover is used to listen to, and a cover is used for data and downloads.The DMB baseband decoder is the DMB decoder of time-sharing work control, and it can make the power consumption of digital multimedia broadcast receiver low greatly.The DMB encoder has adopted on time domain multiplexing to multiple programs, and the program that can only select the user is decoded, and to unselected program interim " shutdown ", has only below 1/3rd of total power dissipation thereby the power consumption of receiver is dropped to.
Claims (9)
1, a kind of coding/decoding method that is used for digital multimedia broadcast receiver, it may further comprise the steps:
The first step is converted into intermediate-freuqncy signal after at first the signal of DMB being entered the RF module of digital multimedia broadcast receiver, converts intermediate-freuqncy signal to digital medium-frequency signal by analog to digital converter;
Second step, utilize digital filtering method that digital medium-frequency signal is carried out the separation of IQ component, the baseband filter by the DMB baseband decoder carries out filtering then, thereby obtains the OFDM time-domain signal of plural form;
In the 3rd step, form the Coded Orthogonal Frequency Division Multiplexing (COFDM) signal after the OFDM time-domain signal of plural form calculated the sampling point of each subcarrier and finish the frequency deinterleaving by FFT;
In the 4th step, the Coded Orthogonal Frequency Division Multiplexing (COFDM) signal is carried out demodulation of high speed four-phase DPSK and deadline deinterleaving;
In the 5th step, carry out channel-decoding with the Viterbi decoder of the DMB baseband decoder signal after with the demodulation of high speed four-phase DPSK by channel decoder, thereby recover the source data of DMB;
In the 6th step, above-mentioned source data is handled by display device.
2, the coding/decoding method that is used for digital multimedia broadcast receiver according to claim 1 is characterized in that described OFDM time-domain signal transmits frame by frame.
3, the coding/decoding method that is used for digital multimedia broadcast receiver according to claim 1, it is characterized in that the bit stream that passes through each transmission frame that forms after separation and the filtering is subdivided into synchronizing channel, fast information channel in dab receiver and MSC data by separating recombiner, the data based MCI that transmits in fast information channel in dab receiver in the MSC is divided into the logical frame of each subchannel, guarantees clock recovery by synchronizing channel.
4, the coding/decoding method that is used for digital multimedia broadcast receiver according to claim 1, it is characterized in that the 4th the step in before the Coded Orthogonal Frequency Division Multiplexing (COFDM) baseband signal is carried out the frequency deinterleaving, receiver should be by the nil symbol of digital multimedia broadcasting signal transmission frame, realization is to each the transmission frame thick time synchronized zero hour, go out to represent each frame to begin to separate in other words the nil symbol of each frame according to power detection, find out nil symbol, realized synchronously thick to digital multimedia broadcasting signal of receiver time reference.
5, the coding/decoding method that is used for digital multimedia broadcast receiver according to claim 1 is characterized in that the 5th step and the 6th can play by MPEG L2 audio decoder when the source data in going on foot is audio program.
6, the coding/decoding method that is used for digital multimedia broadcast receiver according to claim 1 is characterized in that the 5th step and the 6th can process and display by the CPU of outside when the source data in going on foot is data or video frequency program.
7, the coding/decoding method that is used for digital multimedia broadcast receiver according to claim 1 is characterized in that the DMB baseband decoder is provided with digital mixer.
8, the coding/decoding method that is used for digital multimedia broadcast receiver according to claim 1 is characterized in that described baseband filter is a digital filter.
9, the coding/decoding method that is used for digital multimedia broadcast receiver according to claim 1 is characterized in that described DMB baseband decoder is the DMB baseband decoder of time-sharing work control.
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| CNA2008100200727A CN101262571A (en) | 2008-03-28 | 2008-03-28 | A decoding method for digital multimedia broadcast receiver |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104159134A (en) * | 2014-08-29 | 2014-11-19 | 泰州天梭信息科技有限公司 | DAB (Digital Audio Broadcasting) or T-DMB (Terrestrial Digital Multimedia Broadcasting) receiver based on ID200 |
| CN107113451A (en) * | 2015-01-05 | 2017-08-29 | Lg 电子株式会社 | Broadcast singal dispensing device, broadcast receiver, broadcast singal sending method and broadcast signal received method |
| CN111093109A (en) * | 2018-10-24 | 2020-05-01 | 杭州海康威视数字技术股份有限公司 | Media data playing processing method and media playing equipment |
| CN112260785A (en) * | 2020-10-15 | 2021-01-22 | 江苏斑点狗网络科技有限公司 | Broadcasting system based on 5G communication technology |
-
2008
- 2008-03-28 CN CNA2008100200727A patent/CN101262571A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104159134A (en) * | 2014-08-29 | 2014-11-19 | 泰州天梭信息科技有限公司 | DAB (Digital Audio Broadcasting) or T-DMB (Terrestrial Digital Multimedia Broadcasting) receiver based on ID200 |
| CN107113451A (en) * | 2015-01-05 | 2017-08-29 | Lg 电子株式会社 | Broadcast singal dispensing device, broadcast receiver, broadcast singal sending method and broadcast signal received method |
| US10601625B2 (en) | 2015-01-05 | 2020-03-24 | Lg Electronics Inc. | Broadcast signal transmitting apparatus, broadcast signal receiving apparatus, broadcast signal transmitting method, and broadcast signal receiving method |
| CN107113451B (en) * | 2015-01-05 | 2020-11-03 | Lg 电子株式会社 | Broadcast signal transmitting device, broadcast signal receiving device, broadcast signal transmitting method, and broadcast signal receiving method |
| US10855507B2 (en) | 2015-01-05 | 2020-12-01 | Lg Electronics Inc. | Broadcast signal transmitting apparatus, broadcast signal receiving apparatus, broadcast signal transmitting method, and broadcast signal receiving method |
| CN111093109A (en) * | 2018-10-24 | 2020-05-01 | 杭州海康威视数字技术股份有限公司 | Media data playing processing method and media playing equipment |
| CN111093109B (en) * | 2018-10-24 | 2022-07-29 | 杭州海康威视数字技术股份有限公司 | Media data playing processing method and media playing equipment |
| CN112260785A (en) * | 2020-10-15 | 2021-01-22 | 江苏斑点狗网络科技有限公司 | Broadcasting system based on 5G communication technology |
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