CN104023188B - A kind of many bandwidth applications methods and corresponding DTMB receivers of DTMB receivers - Google Patents
A kind of many bandwidth applications methods and corresponding DTMB receivers of DTMB receivers Download PDFInfo
- Publication number
- CN104023188B CN104023188B CN201410230582.2A CN201410230582A CN104023188B CN 104023188 B CN104023188 B CN 104023188B CN 201410230582 A CN201410230582 A CN 201410230582A CN 104023188 B CN104023188 B CN 104023188B
- Authority
- CN
- China
- Prior art keywords
- dtmb
- frequency
- bandwidth
- chip
- clkf
- 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.)
- Active
Links
Landscapes
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
The present invention relates to many bandwidth applications methods and corresponding DTMB receivers of a kind of DTMB receivers, many bandwidth applications methods are comprised the following steps：Step S1, if desire bandwidth is B1, it is B that DTMB receives the former reception bandwidth of chip2, it is f that DTMB receives the former reference clock of chipclki, then calculate the reference clock f of desire bandwidthclkf=fclki*B1/B2；Step S2, the intermediate-frequency filter bandwidth changed in tuner so as to more than or equal to desire bandwidth B1；Step S3, makes DTMB receive the mid frequency IF of the intermediate-freuqncy signal that chip is receivedlowIt is less than fclkf/ 2 B1/2 and be more than B1/ 2 value；Step S4, receives the mid frequency IF of the intermediate-freuqncy signal that chip is received according to DTMBlow, the mid frequency arranged required for DTMB reception chips is IFlow*2^32/fclkf.The present invention receives chip using ripe DTMB, using existing tuner, i.e., can carry out the reception of the narrow band signal of any bandwidth between 1.5M～8M.
Description
Technical field
The present invention relates to digital TV technology, more particularly to a kind of DTMB (Digital Terrestrial
Multimedia Broadcasting, DTTB) receiver many bandwidth applications methods and the method it is corresponding
DTMB receivers.
Background technology
China Digital TV ground broadcast transfer system standard with independent intellectual property right-《DTTB
Transmission system frame structure, Channel Coding and Modulation》(i.e. DTMB) is sent out by national standard administration committee in August in 2006 on the 30th
Cloth, and will implement 1 day in August in 2007.This digital TV ground transmission national standard is pressure standard, is terrestrial radio
Depending on Basic criterion.In succession in DVB-T (the Digital Video Terrestrial Broadcasting- in Europe
Terrestrial), the ISDB-T of the ATSC (Advanced Television Systems Committee) in the U.S. and Japan
(Integrated Service Digital Broadcasting-Terrestrial) three kinds of international ground digital television broadcasts
(DTTB) standard, DTMB become the 4th world DTTB standard in December, 2011 formally by International Telecommunication Association's accreditation.These four marks
Accurate topmost difference is that modulation system, wherein European standard and Nippon Standard are all employed based on OFDM (Orthogonal
Frequency Division Multiplexing) multi-carrier modulation technology, and Unite States Standard has then used 8-VSB
The single-carrier modulated mode of (Trellis-Coded 8-Level Vestigial Side-Band).The DTMB regular sets of China
Into the advantage of single multicarrier, multi-carrier mode can have both been adopted, it would however also be possible to employ single carrier mode, supporting SFN, resisting
Interference performance, frequent utilization rate, threshold level are supported the aspects such as multi-service, have obvious technical advantage than other three standards.
At the beginning of 2013, combine what the department such as national development and reform committee issued by the Ministry of Industry and Information Technology《With regard to general
And the implementation guideline of ground digital television receiver》It is distinctly claimed from 1 day January in 2014,40 inches of domestic market sale
And the television set of the above should possess terrestrial DTV receive capabilities.From 1 day January in 2015, in the institute of domestic market sale
There is size television machine all possess terrestrial DTV receive capabilities.What is produced before the above-mentioned deadline does not possess ground number
The inventory of word television receiving function, should dispense terrestrial digital television set box in sale.It can be seen that, DTMB is held with its system
Measure the advantages such as the strong, wide coverage of big, transmittability and develop rapidly and popularize.
DTMB has the advantage of technological precedence in the application of 6/7/8MHz bandwidth in the world, but with communication skill
The aspects such as the development of art, video wireless backhaul, hot news wireless backhaul, fire-fighting, public safety start wirelessly wide using arrowband
Broadcast, the radio broadcasting passback of such as 2MHz bandwidth.But existing ATSC standards, DVB-T standards, ISDB-T standards and DTMB
Standard, only supports that the broadcasted application of 6/7/8M bandwidth, and existing other Narrowcastings are not standard applications, are all root
According to exploitation designer's needs, individually designed manipulator and receiver, range of application is very narrow.
The content of the invention
The technical problem to be solved is to provide a kind of many bandwidth applications methods of DTMB receivers and corresponding
DTMB receivers, for solving the problems, such as that present DTMB receivers are not suitable for Narrowcasting.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of many bandwidth applications methods of DTMB receivers,
The DTMB receivers include that the tuner being connected with each other and DTMB receive chip, and tuner receives radiofrequency signal, and by radio frequency
Signal is converted to intermediate-freuqncy signal and is transferred to DTMB reception chips, and DTMB receives chip receiving intermediate frequency signal, and is converted into TS
Code stream is exported, and many bandwidth applications methods are comprised the following steps：
Step S1, if desire bandwidth is B1, it is B that DTMB receives the former reception bandwidth of chip2, the Radix Scrophulariae of DTMB reception chips
Clock is examined for fclki, then the reference clock f of desire bandwidth is calculated using equation belowclkf：
fclkf=fclki*B1/B2；
Step S2, the intermediate-frequency filter bandwidth changed in tuner so as to more than or equal to desire bandwidth B1；
Step S3, this special sampling theorem of Gui according to how make DTMB receive the mid frequency of the intermediate-freuqncy signal that chip is received
IFlowIt is less than fclkf/2-B1/ 2 and be more than B1/ 2 value；
Step S4, receives the mid frequency IF of the intermediate-freuqncy signal that chip is received according to DTMBlow, DTMB is set and receives chip
Required mid frequency is IFlow*2^32/fclkf。
Further, in step S1, DTMB receives former reception bandwidth B of chip2Value be 6MHz, 7MHz or 8MHz, and
Former reception bandwidth B is determined by the register declaration of change DTMB reception chips2Value.
Further, the intermediate-frequency filter bandwidth changed in tuner in step S2 is specifically included：If intermediate-frequency filter
Bandwidth can set, then directly change tuner in intermediate-frequency filter bandwidth, otherwise change intermediate-frequency filter.
Further, if the actual value of the mid frequency of the intermediate-freuqncy signal of tuner output can not be modified, the step
Rapid S3 is specifically included：
Step S31, calculates fclkf/2-B1/ 2 value, and select the reality of the mid frequency of the intermediate-freuqncy signal of tuner output
Value, calculates the actual value of the mid frequency and difference IF of its eigenvalue1；
Step S32, if it is F that tuner receives the former bandwidth radio-frequency of radiofrequency signalRF, tuner is received into the band of radiofrequency signal
Wide radio frequency is revised as FRF+IF1Value, make tuner output intermediate-freuqncy signal mid frequency be equal to step S31 described in center
The actual value of frequency；
Step S33, this special sampling theorem of Gui according to how, DTMB receive chip and adopt fclkfMultiple harmonic sampling, with should
Multiple harmonic sampled value deducts the actual value of mid frequency described in step S31, obtains DTMB and receives the intermediate frequency letter that chip is received
Number mid frequency, the value of the mid frequency is less than fclkf/2-B1/ 2 and be more than B1/2。
Further, in step S33, DTMB receives chip and adopts fclkfFour-time harmonic sampling.
Further, in step S33, if DTMB receives chip and adopts fclkfOdd harmonics sampling, then receive
The polarity of the frequency spectrum of intermediate-freuqncy signal changes, if DTMB receives chip and adopts fclkfEven harmonics sampling, then receive
The polarity of the frequency spectrum of intermediate-freuqncy signal does not change.
Further, if the actual value of the mid frequency of the intermediate-freuqncy signal of tuner output can be modified, in step S3
Do not change the former bandwidth radio-frequency that tuner receives radiofrequency signal, directly set the mid frequency of the intermediate-freuqncy signal of tuner output
Actual value so as to be less than fclkf/2-B1/ 2 value.
Technical scheme also includes a kind of DTMB receivers, and which includes that the tuner being connected with each other and DTMB are received
Chip, tuner receive radiofrequency signal, and by radiofrequency signal be converted to intermediate-freuqncy signal be transferred to DTMB receive chip, DTMB receive
Chip receiving intermediate frequency signal, and the output of TS code streams is converted into, also include with lower module：
Reference clock computing module, for calculating the reference clock f of desire bandwidthclkf, calculating process is：If desire bandwidth
For B1, it is B that DTMB receives the former reception bandwidth of chip2, it is f that DTMB receives the former reference clock of chipclki, then fclkf=fclki*
B1/B2；
Intermediate-frequency filter bandwidth setup module, which is used for the intermediate-frequency filter bandwidth changed in tuner so as to more than or
Equal to desire bandwidth B1；
First frequency setup module, which is used for this special sampling theorem of Gui according to how, and setting DTMB is received during chip receives
The mid frequency IF of frequency signallowIt is less than fclkf/2-B1/ 2 value；
Second frequency setup module, which is used for the mid frequency IF that the intermediate-freuqncy signal that chip is received is received according to DTMBlow,
The mid frequency arranged required for DTMB reception chips is IFlow*2^32/fclkf。
Further, the first frequency setup module includes：
Computing module, which is used to calculate fclkf/2-B1/ 2 value, and select the center frequency of the intermediate-freuqncy signal of tuner output
The actual value of rate, calculates the actual value of the mid frequency and difference IF of its eigenvalue1；
Bandwidth radio-frequency setup module, which is used to change the bandwidth radio-frequency that tuner receives radiofrequency signal, if tuner is received
The former bandwidth radio-frequency of radiofrequency signal is FRF, then the bandwidth radio-frequency for changing tuner reception radiofrequency signal is FRF+IF1, make tuner
The mid frequency of the intermediate-freuqncy signal of output is equal to the actual value of mid frequency；
IF signal frequency setup module, which is used for this special sampling theorem of Gui according to how, makes DTMB receive chip and adopts
fclkfMultiple harmonic sampling, and the actual value of mid frequency is deducted with the multiple harmonic sampled value, obtains DTMB and receive chip
The mid frequency of the intermediate-freuqncy signal of reception, the value of the mid frequency are less than fclkf/2-B1/ 2 and be more than B1/2。
Further, if DTMB receives chip and adopts fclkfOdd harmonics sampling, then the frequency spectrum of the intermediate-freuqncy signal for receiving
Polarity change, if DTMB receive chip adopt fclkfEven harmonics sampling, then the frequency spectrum of the intermediate-freuqncy signal for receiving
Polarity do not change.
The invention has the beneficial effects as follows：The present invention receives chip using ripe DTMB, using existing tuner, can
The reception of narrow band signal is carried out enough.Using the method for the present invention, the bandwidth ratio of receivable narrow band signal is more flexible, Ke Yishi
Any bandwidth between 1.5M～8M, while different settings can be carried out according to practical application, than existing narrow-band receiver
FPGA design is more flexible.
Description of the drawings
Fig. 1 is the structural representation of existing DTMB receivers；
Fig. 2 is the schematic flow sheet of many bandwidth applications methods of DTMB receivers of the present invention；
Fig. 3 is the structural representation of improved DTMB receivers of the invention.
In accompanying drawing, the list of parts representated by each label is as follows：
1st, tuner, 2, DTMB receive chip, 3, reference clock, 4, reference clock computing module, 5, intermediate-frequency filter band
Wide setup module, 6, first frequency setup module, 7, second frequency setup module.
Specific embodiment
The principle and feature of the present invention are described below in conjunction with accompanying drawing, example is served only for explaining the present invention, and
It is non-for limiting the scope of the present invention.
This gives a kind of many bandwidth applications methods of DTMB receivers, for extending existing DTMB standards 6/
The application of 7/8MHz, makes DTMB standards can be suitably used for Narrowcasting.
As shown in figure 1, existing DTMB receivers include the tuner 1 being connected with each other and DTMB receives chip 2, DTMB is received
Chip carries reference clock 3, and tuner 1 receives radiofrequency signal, and radiofrequency signal is converted to intermediate-freuqncy signal is transferred to DTMB and connect
Chip 2 is received, DTMB receives chip receiving intermediate frequency signal, and is converted into the output of TS code streams.
Tuner and DTMB based on existing DTMB receivers receives the kernel of chip, as shown in Fig. 2 the present embodiment is more
Bandwidth applications method is comprised the following steps：
Step S1, if desire bandwidth is B1, it is B that DTMB receives the former reception bandwidth of chip2, the Radix Scrophulariae of DTMB reception chips
Clock is examined for fclki, then the reference clock f of desire bandwidth is calculated using equation belowclkf：
fclkf=fclki*B1/B2；
Step S2, the intermediate-frequency filter bandwidth changed in tuner so as to more than or equal to desire bandwidth B1；
Step S3, this special sampling theorem of Gui according to how make DTMB receive the mid frequency of the intermediate-freuqncy signal that chip is received
IFlowIt is less than fclkf/2-B1/ 2 and be more than B1The value of/2 value；
Step S4, receives the mid frequency IF of the intermediate-freuqncy signal that chip is received according to DTMBlow, DTMB is set and receives chip
Required mid frequency is IFlow*2^32/fclkf。
Wherein, in step S1, DTMB receives former reception bandwidth B of chip2Value be 6MHz, 7MHz or 8MHz, can
Former reception bandwidth B is determined by the register declaration of change DTMB reception chips2Value.
In the present embodiment, if the actual value of the mid frequency of the intermediate-freuqncy signal of tuner output can not be modified, institute
State step S3 to specifically include：
Step S31, calculates fclkf/2-B1/ 2 value, and select the reality of the mid frequency of the intermediate-freuqncy signal of tuner output
Value, calculates the actual value of the mid frequency and difference IF of its eigenvalue1；
Step S32, if it is F that tuner receives the former bandwidth radio-frequency of radiofrequency signalRF, tuner is received into the band of radiofrequency signal
Wide radio frequency is revised as FRF+IF1Value, make tuner output intermediate-freuqncy signal mid frequency be equal to step S3 described in center frequency
The actual value of rate；
Step S33, this special sampling theorem of Gui according to how, DTMB receive chip and adopt fclkfMultiple harmonic sampling, with should
Multiple harmonic sampled value deducts the actual value of mid frequency described in step S31, obtains less than fclkf/2-B1/ 2 DTMB is received
The mid frequency of the intermediate-freuqncy signal that chip is received.
In step S33, if DTMB receives chip and adopts fclkfOdd harmonics sampling, then receive intermediate frequency letter
Number the polarity of frequency spectrum change, if DTMB receives chip and adopts fclkfEven harmonics sampling, then receive intermediate frequency letter
Number the polarity of frequency spectrum do not change.
Below with two specific application examples illustrating how for DTMB standards to be applied to Narrowcasting.
Application examples one
With the tuner of the high intermediate frequencies of existing 36MHz, tuner intermediate-frequency filter wouldn't be changed, it is desirable to existing receiver
Chip LGS9701 specifically includes following steps realizing the narrow-band reception of 2MHz：
Step SA1：To avoid unnecessary spectral aliasing, reference clock f is improved as far as possibleclkf, take B1=2MHz, B2=
6MHz, former reference frequency are 30.4MHz, calculate fclkf=10.133MHz.
Step SA2：Using intermediate-frequency filter be difficult to change, so as to the mid frequency of tuner output intermediate-freuqncy signal is difficult
To change, therefore the output signal of tuner is made to concentrate the 8MHz of 32MHz to 40MHz with alleviating distention in middle-JIAO.
Step SA3：This special sampling theorem of Gui according to how, the frequency of useful intermediate-freuqncy signal are not to be exceeded fclkf/ 2=
5.06MHz, due to should use-case carry out the narrow-band reception of 2MHz, therefore the mid frequency of the Low Medium Frequency of output is needed less than fclkf/
2-B1/ 2=4.06MHz.It is another as the mid frequency of former intermediate-frequency filter and reality output intermediate-freuqncy signal is difficult to change therefore right
In actual 2MHz bandwidth radio-frequencies FRFFor, the receives frequency for arranging tuner is FRF+ 2MHz, the reality of such tuner are defeated
The 2M intermediate-freuqncy signals for going out just concentrate on 37MHz to 39MHz, and its mid frequency is 38MHz.DTMB receives chip and adopts fclkf4
The sampling of times harmonic wave, end value is fclkf* 4=40.52, then DTMB receive the mid frequency IF of the intermediate-freuqncy signal that chip is receivedlowBecome
To meet the low intermediate frequency signal of how this special sampling theorem of Gui, it is 40.52MHz-38MHz=2.52MHz.
Should be in use-case, the receives frequency of tuner may be alternatively provided as FRF+ 1MHz, the now 2M of the reality output of tuner
Intermediate-freuqncy signal concentrates on 36MHz to 38MHz, and its mid frequency is 37MHz.DTMB receivers still adopt fclkf4 times of harmonic waves adopt
Sample, is changed into meeting the low intermediate frequency signal of how this special sampling theorem of Gui, and its mid frequency is 3.52MHz.
In practice, its mid frequency could be arranged to multiple, and the receives frequency of tuner may be alternatively provided as FRF+0.5
To FRF+ 3.5 arbitrary value, meets the setting step-length of tuner.
Step SA4：In the register declaration of LGS9701, the method for arranging the reception mid frequency of receiver is IFlow*
2^32/30.4；Due to reference clock it is varied for fclkf=10.133MHz, therefore its corresponding computational methods is also changed to：
IFlow*2^32/10.133；Result according to calculating arranges corresponding depositor again.Should use-case employ setting for original 6MHz
Put, therefore according to the register declaration of LGS9701, be set to 6MHz receptions.
Step SA5：It is to employ f as high intermediate frequency is changed into Low Medium Frequency by LGS9701clkfHigher hamonic wave, the pole of frequency spectrum
Property also there is corresponding change, should use-case employ four-time harmonic, therefore its polarity is constant.
Using above-mentioned steps, former DTMB receivers can be changed into the receiver of 2MHz systems.
Application examples two
So that existing Low Medium Frequency IF-FRE is for 2-10MHz silicon tuners as an example, tuner intermediate-frequency filter bandwidth
Can set, its Low Medium Frequency IF-FRE can be arranged in 2-10MHz, it is desirable to received chip LGS9701 and realized that the arrowband of 4MHz connects
Receive, specifically include following steps：
Step SB1：B1=4MHz, B2=8MHz, former reference frequency are 30.4MHz, therefore fclkf=15.2MHz.
Step SB2：Should the Low Medium Frequency IF-FRE alterable of silicon tuner that adopts of use-case, and tuner intermediate frequency
Filter bandwidht can set, due to fclkf=15.2MHz, a width of 4MHz of band of reception narrow band signal, therefore silicon tuner
Low Medium Frequency IF-FRE can be set between 2MHz-5.6MHz, should use-case orientate 4.5MHz as, and set the filter of tuner intermediate frequency
The a width of 4MHz of ripple device band (is more than 4MHz).
Step SB3：This special sampling theorem of Gui according to how, the frequency of useful intermediate-freuqncy signal are not to be exceeded fclkf/ 2=
7.6MHz；As the present embodiment is the narrow-band reception of 4MHz, therefore the mid frequency of the Low Medium Frequency of output is needed less than fclkf/2-B1/
2=5.6MHz.As former intermediate-frequency filter and reality output intermediate frequency can be changed, therefore for actual 4MHz bandwidth radio-frequencies FRFCome
Say, the receives frequency of tuner is set to be still FRF。
Step SB4：The side of the mid frequency of receiver receiving intermediate frequency signal, in the register declaration of LGS9701, is set
Method is IFlow*2^32/30.4；Due to reference clock it is varied for fclkf=15.2MHz, therefore its corresponding computational methods
It is changed to：IFlow*2^32/15.2；Corresponding depositor is arranged according to the result for calculating, should use-case employ original 8MHz's
Arrange, which is LGS9701 default settings, therefore need not be changed.
Based on many bandwidth applications methods of above-mentioned DTMB receivers, the present embodiment improves existing DTMB receivers, such as Fig. 3
It is shown, on the basis of existing tuner 1 and DTMB receive chip 2, also include with lower module：
Reference clock computing module 4, for calculating the reference clock f of desire bandwidthclkf, calculating process is：If required band
A width of B1, it is B that DTMB receives the former reception bandwidth of chip2, it is f that DTMB receives the former reference clock of chipclki, then fclkf=
fclki*B1/B2；
Intermediate-frequency filter bandwidth setup module 5, which is used for the intermediate-frequency filter bandwidth changed in tuner so as to more than or
Equal to desire bandwidth B1；
First frequency setup module 6, which is used for this special sampling theorem of Gui according to how, and setting DTMB is received during chip receives
The mid frequency IF of frequency signallowIt is less than fclkf/2-B1/ 2 and be more than B1/ 2 value；
Second frequency setup module 7, which is used for the mid frequency IF that the intermediate-freuqncy signal that chip is received is received according to DTMBlow,
The mid frequency arranged required for DTMB reception chips is IFlow*2^32/fclkf。
Wherein, the first frequency setup module 6 includes again：
Computing module, which is used to calculate fclkf/2-B1/ 2 value, and select the center frequency of the intermediate-freuqncy signal of tuner output
The actual value of rate, calculates the actual value of the mid frequency and difference IF of its eigenvalue1；
Bandwidth radio-frequency setup module, which is used to change the bandwidth radio-frequency that tuner receives radiofrequency signal, if tuner is received
The former bandwidth radio-frequency of radiofrequency signal is FRF, then the bandwidth radio-frequency for changing tuner reception radiofrequency signal is FRF+IF1, make tuner
The mid frequency of the intermediate-freuqncy signal of output is equal to the actual value of mid frequency；
IF signal frequency setup module, which is used for this special sampling theorem of Gui according to how, makes DTMB receive chip and adopts
fclkfMultiple harmonic sampling, and the actual value of mid frequency is deducted with the multiple harmonic sampled value, is obtained less than fclkf/2-B1/
2 DTMB receives the mid frequency of the intermediate-freuqncy signal that chip is received.
The improved DTMB receivers, its specific operation principle and implementation process and above-mentioned many bandwidth applications methods and
Two application examples are identical, no longer to state more.
The foregoing is only presently preferred embodiments of the present invention, not to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (10)
1. a kind of many bandwidth applications methods of DTMB receivers, the DTMB receivers include tuner and the DTMB being connected with each other
Chip is received, tuner receives radiofrequency signal, and radiofrequency signal is converted to into intermediate-freuqncy signal and be transferred to DTMB reception chips, DTMB
Chip receiving intermediate frequency signal is received, and is converted into the output of TS code streams, it is characterised in that many bandwidth applications methods include
Following steps：
Step S1, if desire bandwidth is B1, it is B that DTMB receives the former reception bandwidth of chip2, when the Radix Scrophulariae of DTMB reception chips is examined
Clock is fclki, then calculate the reference clock f of desire bandwidthclkf=fclki*B1/B2；
Step S2, the intermediate-frequency filter bandwidth changed in tuner so as to more than or equal to desire bandwidth B1；
Step S3, this special sampling theorem of Gui according to how make DTMB receive the mid frequency IF of the intermediate-freuqncy signal that chip is receivedlowFor
Less than fclkf/2-B1/ 2 and be more than B1/ 2 value；
Step S4, receives the mid frequency IF of the intermediate-freuqncy signal that chip is received according to DTMBlow, DTMB is set and is received needed for chip
The mid frequency wanted is IFlow*2^32/fclkf。
2. many bandwidth applications methods according to claim 1, it is characterised in that DTMB receives chip in step S1
Former reception bandwidth B2Value be 6MHz, 7MHz or 8MHz, and receive the register declaration of chip determining original by changing DTMB
Reception bandwidth B2Value.
3. many bandwidth applications methods according to claim 1, it is characterised in that change in tuner in step S2
Intermediate-frequency filter bandwidth is specifically included：If the bandwidth of intermediate-frequency filter can set, the intermediate frequency filtering directly changed in tuner
Device bandwidth, otherwise changes intermediate-frequency filter.
4. many bandwidth applications methods according to claim 1, it is characterised in that if in the intermediate-freuqncy signal of tuner output
The actual value of frequency of heart can not be modified, then step S3 is specifically included：
Step S31, calculates fclkf/2-B1/ 2 value, and the actual value of the mid frequency of the intermediate-freuqncy signal of tuner output is selected,
Calculate the actual value of the mid frequency and difference IF of its eigenvalue1；
Step S32, if it is F that tuner receives the former bandwidth radio-frequency of radiofrequency signalRF, the bandwidth that tuner receives radiofrequency signal is penetrated
Frequency is revised as FRF+IF1Value, make tuner output intermediate-freuqncy signal mid frequency be equal to step S31 described in mid frequency
Actual value；
Step S33, this special sampling theorem of Gui according to how, DTMB receive chip and adopt fclkfMultiple harmonic sampling, it is repeatedly humorous with this
Ripple sampled value deducts the actual value of mid frequency described in step S31, obtains DTMB and receives in the intermediate-freuqncy signal that chip is received
Frequency of heart, the value of the mid frequency are less than fclkf/2-B1/ 2 and be more than B1/2。
5. many bandwidth applications methods described in claim 4, it is characterised in that in step S33, DTMB receive chip and adopt
fclkfFour-time harmonic sampling.
6. many bandwidth applications methods according to claim 4, it is characterised in that in step S33, if DTMB receives core
Piece adopts fclkfOdd harmonics sampling, then the polarity of the frequency spectrum of the intermediate-freuqncy signal for receiving changes, if DTMB receives core
Piece adopts fclkfEven harmonics sampling, then the polarity of the frequency spectrum of the intermediate-freuqncy signal for receiving do not change.
7. many bandwidth applications methods according to claim 1, it is characterised in that if in the intermediate-freuqncy signal of tuner output
The actual value of frequency of heart can be modified, then do not change the former bandwidth radio-frequency that tuner receives radiofrequency signal in step S3, directly
The actual value of the mid frequency of the intermediate-freuqncy signal of setting tuner output so as to be less than fclkf/2-B1/ 2 value.
8. a kind of DTMB receivers, receive chip including the tuner and DTMB being connected with each other, and tuner receives radiofrequency signal, and
Radiofrequency signal is converted to into intermediate-freuqncy signal it is transferred to DTMB and receive chip, DTMB receives chip receiving intermediate frequency signal, and by its turn
It is changed to the output of TS code streams, it is characterised in that also include with lower module：
Reference clock computing module, for calculating the reference clock f of desire bandwidthclkf, calculating process is：If desire bandwidth is B1,
It is B that DTMB receives the former reception bandwidth of chip2, it is f that DTMB receives the former reference clock of chipclki, then fclkf=fclki*B1/B2；
Intermediate-frequency filter bandwidth setup module, which is used for the intermediate-frequency filter bandwidth changed in tuner so as to be more than or equal to
Desire bandwidth B1；
First frequency setup module, which is used for this special sampling theorem of Gui according to how, sets DTMB and receives the intermediate frequency letter that chip is received
Number mid frequency IFlowIt is less than fclkf/2-B1/ 2 value；
Second frequency setup module, which is used for the mid frequency IF that the intermediate-freuqncy signal that chip is received is received according to DTMBlow, arrange
It is IF that DTMB receives the mid frequency required for chiplow*2^32/fclkf。
9. DTMB receivers according to claim 8, it is characterised in that the first frequency setup module includes：
Computing module, which is used to calculate fclkf/2-B1/ 2 value, and select the mid frequency of the intermediate-freuqncy signal of tuner output
Actual value, calculates the actual value of the mid frequency and difference IF of its eigenvalue1；
Bandwidth radio-frequency setup module, which is used to change the bandwidth radio-frequency that tuner receives radiofrequency signal, if tuner receives radio frequency
The former bandwidth radio-frequency of signal is FRF, then the bandwidth radio-frequency for changing tuner reception radiofrequency signal is FRF+IF1, export tuner
Intermediate-freuqncy signal mid frequency be equal to mid frequency actual value；
IF signal frequency setup module, which is used for this special sampling theorem of Gui according to how, makes DTMB receive chip and adopts fclkfIt is many
Subharmonic is sampled, and the actual value of mid frequency is deducted with the multiple harmonic sampled value, obtains DTMB and receives in chip reception
The mid frequency of frequency signal, the value of the mid frequency are less than fclkf/2-B1/ 2 and be more than B1/2。
10. DTMB receivers according to claim 9, it is characterised in that if DTMB receives chip and adopts fclkfOdd-times
Harmonic wave is sampled, then the polarity of the frequency spectrum of the intermediate-freuqncy signal for receiving changes, if DTMB receives chip and adopts fclkfEven-times
Harmonic wave is sampled, then the polarity of the frequency spectrum of the intermediate-freuqncy signal for receiving does not change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410230582.2A CN104023188B (en) | 2014-05-28 | 2014-05-28 | A kind of many bandwidth applications methods and corresponding DTMB receivers of DTMB receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410230582.2A CN104023188B (en) | 2014-05-28 | 2014-05-28 | A kind of many bandwidth applications methods and corresponding DTMB receivers of DTMB receivers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104023188A CN104023188A (en) | 2014-09-03 |
| CN104023188B true CN104023188B (en) | 2017-03-29 |
Family
ID=51439734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410230582.2A Active CN104023188B (en) | 2014-05-28 | 2014-05-28 | A kind of many bandwidth applications methods and corresponding DTMB receivers of DTMB receivers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104023188B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113765837B (en) * | 2021-11-09 | 2022-02-11 | 湖南省时空基准科技有限公司 | Modulation method, system, equipment and storage medium for narrow-band data broadcast |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1261713A (en) * | 1998-12-11 | 2000-08-02 | 索尼公司 | Reseiving device and method, communication device and method |
| WO2007021127A1 (en) * | 2005-08-18 | 2007-02-22 | Lg Innotek Co., Ltd | Apparatus for receiving satellite broadcasting and method thereof |
| CN201976197U (en) * | 2010-12-24 | 2011-09-14 | 北京北广科技股份有限公司 | Variable bandwidth digital television exciter |
| CN102739580A (en) * | 2011-03-31 | 2012-10-17 | 索尼公司 | Receiver, reception method, program and reception system |
-
2014
- 2014-05-28 CN CN201410230582.2A patent/CN104023188B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1261713A (en) * | 1998-12-11 | 2000-08-02 | 索尼公司 | Reseiving device and method, communication device and method |
| WO2007021127A1 (en) * | 2005-08-18 | 2007-02-22 | Lg Innotek Co., Ltd | Apparatus for receiving satellite broadcasting and method thereof |
| CN201976197U (en) * | 2010-12-24 | 2011-09-14 | 北京北广科技股份有限公司 | Variable bandwidth digital television exciter |
| CN102739580A (en) * | 2011-03-31 | 2012-10-17 | 索尼公司 | Receiver, reception method, program and reception system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104023188A (en) | 2014-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104023188B (en) | A kind of many bandwidth applications methods and corresponding DTMB receivers of DTMB receivers | |
| US20140368743A1 (en) | Multiple wi-fi atsc tv antenna receiver | |
| CN101841644B (en) | Adjacent channel interference elimination device and method | |
| CN101569187A (en) | Digital video broadcasting apparatus and digital video broadcasting method | |
| US8385471B2 (en) | Multi-channel receiver | |
| CN204206374U (en) | A kind of simple two-way signal receives descrambling kilocalorie receiver | |
| WO2017128622A1 (en) | Digital television and signal processing apparatus thereof | |
| CN204334857U (en) | The digital TV set-top box of a kind of compatible with DVB-C, DTMB-TH transmission medium | |
| CN203661184U (en) | Multi-standard tuner having broadband radio frequency input loop addition output function | |
| CN101494758B (en) | Single frequency net front end center transmitting station for multi-channel of digital television ground broadcast | |
| CN204681523U (en) | A kind of DVB module based on intelligent operating system Set Top Box | |
| CN201541330U (en) | 3D stereoscopic digital television | |
| CN204258994U (en) | A kind of four frequency Signal reception descrambling kilocalorie receivers | |
| CN104104634B (en) | DTMB modulator multi-bandwidth application method and corresponding DTMB modulator | |
| CN202979203U (en) | Digital TV system | |
| CN207070198U (en) | A kind of channel based on DVB C and DTMB receives switching control | |
| CN203057372U (en) | Digital television receiving terminal | |
| US11477518B2 (en) | Signal processing device and signal processing method | |
| CN202127420U (en) | Double demodulation circuit and set-top box with same | |
| CN205610847U (en) | Wireless video receiving system | |
| CN205029804U (en) | G. hn intelligence TV gateway | |
| CN211959414U (en) | High-definition set top box | |
| CN107317981A (en) | A kind of channel based on DVB C and DTMB receives switching control and method | |
| US20170223404A1 (en) | Digital television and signal processing apparatus thereof | |
| CN204887306U (en) | Television decoder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |