CN102271232B - Method and device for receiving and decoding analog television signals - Google Patents
Method and device for receiving and decoding analog television signals Download PDFInfo
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- CN102271232B CN102271232B CN201010195756.8A CN201010195756A CN102271232B CN 102271232 B CN102271232 B CN 102271232B CN 201010195756 A CN201010195756 A CN 201010195756A CN 102271232 B CN102271232 B CN 102271232B
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Abstract
The invention provides a method for receiving and decoding analog television signals. The method comprises the following steps: after analog television signals received by an antenna are processed successively by a filter, a low noise amplifier and a zero intermediate frequency converter, the analog television signals are subjected to analog-to-digital converting and demodulating successively by adopting the local clock signal of the receiving terminal, and the demodulated CVBS (composite video broadcast signal) is obtained; and the CVBS sampling rate is converted so as to be matched with a recovering launch pad clock, then by adopting the signal of the recovering launch pad clock, the CVBS is decoded and an image is obtained and output. The invention also provides a device for receiving and decoding the analog television signals. By adopting the invention, the effect of degraded image decoding caused by moving can be lessened so that the accuracy of receiving and decoding the analog television signals is improved.
Description
Technical field
The present invention relates to anolog TV signals technical field, particularly a kind of receive decoding method of anolog TV signals and device.
Background technology
Having there is considerable time as a ripe technical standard in analogue television standards, and is widely used.Simulated television receiving equipment needs to receive and process the TV signal spreading out of from each TV station's analog signal transmitter in real time, realizes the synchronous broadcasting of analog television program.Traditional simulated television receiving equipment lacks single process chip, needs tuner, demodulator, and a plurality of simulation process modules such as decoder, volume is large, and power consumption is large, thereby is mainly used in household consumption electrical equipment, namely common family expenses colour TV.
Develop rapidly along with CMOS technology; the solution that makes simulated television receive one chip becomes possibility; solution is the solution that simulation or digital-to-analogue are mixed by original single analog circuit derivation; reduced volume; reduce power consumption, thereby made simulated television be applied to the Mobile portable equipments such as mobile phone.
In prior art, the device of common digital-to-analogue hybrid mode reception anolog TV signals can be with reference to shown in figure 1.Filter 102, low noise amplifier 103, zero intermediate frequency transducer 104 are simulation process device, and they receive the analog signal of TV station's transmitting this locality by antenna 101 and convert baseband signal to and process for subsequent module.Analog to digital converter 105 converts analog signal to digital signal, and demodulator 106 subsequently, voice decoder 109, image decoder 110 and clock recovery device 108 are digital processing device.Wherein clock recovery device 108 extracts the clock frequency of the transmitting station of anolog TV signals from composite video broadcast singal (CVBS) signal of demodulator 106 outputs, the transmitting station clock being restored.The transmitting station clock signal recovering exports respectively analog to digital converter 105, demodulator 106, voice decoder 109 and image decoder 110 to, make above-mentioned digital processing device can adopt the clock synchronous with transmitting station, thereby make image energy normal decoder and show.
This structure is relatively applicable to non-mobile device.For mobile device, in moving process, because the complex environments such as building can cause multipath effect, due to fast moving, can cause the effects such as Doppler (doppler), add altering a great deal of signal to noise ratio (snr), the clock frequency extracting has larger shake, and the shake meeting of clock frequency and then affect the precision of analog to digital converter 105 reduces the sensitivity of simulated television receiving equipment.In addition, clock recovery device 108 extracts after the clock signal of synchronizeing with TV station, need to produce for image decoder 110 and the required clock of voice decoder 109 simultaneously, the required clock frequency of image decoder 110 and voice decoder 109 is not identical, this needs phase-locked loop (PLL) circuit to adjust accordingly clock frequency, has increased and has realized area and cost.
Summary of the invention
The invention provides a kind of receive decoding method and device of anolog TV signals, can reduce the deteriorated impact of image decoding causing due to moving process, improve the precision of receipt decoding.
The embodiment of the present invention proposes a kind of receive decoding method of anolog TV signals, and the anolog TV signals of antenna reception after filter, low noise amplifier and zero intermediate frequency transducer are processed, are handled as follows successively:
Adopt receiving terminal local clock signal to carry out successively analog-to-digital conversion to described anolog TV signals, obtain having the digitized anolog TV signals of the first sample rate;
The described digitized anolog TV signals with the first sample rate are carried out to demodulation, obtain having composite video broadcast singal CVBS and the audio signal of the first sample rate;
Adopt receiving terminal local clock signal to carry out voice codec to described audio signal, obtain sound output; And
According to local clock signal and described in there is the first sample rate CVBS recover transmitting station clock signal, by the described sample rate conversion with the CVBS of the first sample rate, be the CVBS with the second sample rate, described the second sample rate with described in the transmitting station clock signal that recovers mate; Then adopt the transmitting station clock signal recovering to carry out image decoding to the described CVBS with the second sample rate, obtain image output.
Preferably, described is that the CVBS with the second sample rate is by the described sample rate conversion with the CVBS of the first sample rate:
Farrow filter has the CVBS of the first sample rate described in receiving, and according to the transmitting station clock signal recovering, the received CVBS with the first sample rate is converted to the CVBS with the second sample rate.
The embodiment of the present invention also proposes a kind of receipt decoding device of anolog TV signals, comprise antenna (201), filter (202), low noise amplifier (203), zero intermediate frequency transducer (204), analog to digital converter (205), demodulator (206), local clock generator (207), clock recovery device (208), voice decoder (209) and image decoder (210), described device also comprises Farrow filter (211)
The anolog TV signals that antenna (201) receives export analog to digital converter (205) to successively after filter (202), low noise amplifier (203) and zero intermediate frequency transducer (204) are processed; Analog to digital converter (205) receives the local clock signal from local clock generator (207), according to described local clock signal, received anolog TV signals is carried out to the digitized anolog TV signals that analog-to-digital conversion obtains having the first sample rate;
Demodulator (206), for the described digitized anolog TV signals with the first sample rate being carried out to demodulation according to the local clock signal from local clock generator (207), obtain having composite video broadcast singal CVBS and the audio signal of the first sample rate; The described CVBS with the first sample rate exports Farrow filter (211) and clock recovery device (208) to, and described audio signal exports voice decoder (209) to;
Clock recovery device (208), for according to from the local clock signal of local clock generator (207) and described in there is the first sample rate CVBS recover transmitting station clock signal, and export respectively the described transmitting station clock signal recovering to Farrow filter (211) and image decoder (210);
Voice decoder (209) carries out voice codec according to the local clock signal from local clock generator (207) to received audio signal, obtains and output sound;
Farrow filter (211) is according to the transmitting station clock signal recovering from clock recovery device (208), the received CVBS with the first sample rate is converted to the CVBS with the second sample rate, and exports the described CVBS with the second sample rate to image decoder (210); Described the second sample rate with described in the transmitting station clock signal that recovers mate;
Image decoder (210), according to the transmitting station clock signal recovering from clock recovery device (208), carries out image decoding to the received CVBS with the second sample rate, obtains and output image.
Preferably, described clock recovery device (207) comprises the phase-locked loop consisting of phase difference extractor (304), loop filter (305) and numerical frequency oscillator (306); Wherein,
Phase difference extractor (304), spacing for detection of the line synchronizing signal in the CVBS with the first sample rate receiving, and calculate the poor of spacing between described line synchronizing signal and the analogue television standards definition value setting in advance, described difference is exported as phase signal;
Loop filter (305), for receiving described phase difference, according to the historical phase difference of the phase difference receiving and self storage, draws the difference on the frequency of local clock signal and transmitting station clock signal;
Numerical frequency oscillator (306), for difference on the frequency and the local clock signal of exporting according to loop filter 305, recover transmitting station clock signal, and the described transmitting station clock signal recovering is sent to Farrow filter (211), and feed back to phase difference extractor (304).
Preferably, described clock recovery device (207), also for exporting described difference on the frequency signal to Farrow filter (211);
Described Farrow filter (211) comprising: asynchronous first-in first-out FIFO buffer memory (301), resampling factor computing module 302 and Farrow filtration module (303);
Described asynchronous FIFO buffer memory (301), for receiving and buffer memory has the CVBS of the first sample rate, and export CVBS to the Farrow filtration module (303) of buffer memory, and the bias of storing data by the data depth of self storage and while self starting to export data is sent to resampling factor computing module (302);
Described resampling factor computing module (302), the difference on the frequency calculated signals resampling factor for basis from clock recovery device (207), and export the calculated resampling factor to Farrow filtration module (303);
Farrow filtration module (303), the transmitting station clock signal recovering for basis from clock recovery device (207), read the CVBS with the first sample rate of buffer memory in asynchronous FIFO buffer memory (301), and resample according to the CVBS described in the resampling factor pair from resampling factor computing module (302) with the first sample rate, obtain having the CVBS of the second sample rate.
Preferably, resampling factor computing module (302) calculates the resampling factor according to following formula:
The resampling factor=1-(K
p* P
e)/T1
Wherein, T1 is the reference frequency cycle of local clock signal.
Preferably, resampling factor computing module (302) calculates the resampling factor according to following formula:
The resampling factor=1-K
p* P
e/ T1+K
d* δ D
f, P
eit is described difference on the frequency; K
pfor configurable coefficient.
Wherein, K
d* δ D
fcorrection term for asynchronous FIFO degree of depth counterweight decimation factor; Concrete, K
dfor configurable coefficient, can rule of thumb be configured; δ D
ffor the data depth of asynchronous FIFO 301 storage departs from the data volume of storing when asynchronous FIFO 301 starts to export data, the data volume of storing when the data volume-asynchronous FIFO 301 that equals asynchronous FIFO 301 current storages starts to export data.
As can be seen from the above technical solutions, adopt local clock signal as the clock signal of the devices such as analog to digital converter, demodulator and voice decoder, can avoid because transmitting station clock is estimated the inaccurate impact that these devices are caused; Farrow filter was set before image decoder, the CVBS with first sample rate of mating with local clock that demodulator can be obtained is converted to the CVBS of the second sample rate that the transmitting station clock that has and recover mates, image decoder is decoded to having the CVBS of the second sample rate according to the transmitting station clock recovering again, can obtain correct image.
In addition,, due to the clock that voice decoder directly adopts local clock generator to produce, can also save a part of PLL circuit in clock recovery device.
Accompanying drawing explanation
Fig. 1 is the device schematic diagram that digital-to-analogue hybrid mode of the prior art receives anolog TV signals;
Fig. 2 is the device schematic diagram that the digital-to-analogue hybrid mode of the embodiment of the present invention receives anolog TV signals;
Fig. 3 is clock recovery device 207 in Fig. 2 shown device and the internal module schematic diagram of Farrow filter 211.
Embodiment
The device of the digital-to-analogue hybrid mode reception anolog TV signals that the embodiment of the present invention proposes as shown in Figure 2, different from the apparatus structure described in Fig. 1, analog to digital converter 205 in Fig. 2, demodulator 206 and voice decoder 209 all adopt the local clock signal of local clock generator 207 outputs, to improve front-end processing precision; The anolog TV signals transmitting station clock signal of only having image decoder 210 to adopt clock recovery device 208 to recover is normal to guarantee image decoding stable output.
The anolog TV signals that antenna 201 receives after filter 202, low noise amplifier 203 and zero intermediate frequency transducer 204 are processed, are handled as follows successively:
Adopt receiving terminal local clock signal to carry out successively analog-to-digital conversion to described anolog TV signals, obtain having the digitized anolog TV signals of the first sample rate;
The described digitized anolog TV signals with the first sample rate are carried out to demodulation, obtain having composite video broadcast singal CVBS and the audio signal of the first sample rate;
Adopt receiving terminal local clock signal to carry out voice codec to described audio signal, obtain sound output; And
By the described sample rate conversion with the CVBS of the first sample rate, be the CVBS with the second sample rate, described the second sample rate with described in the transmitting station clock signal that recovers mate; Then adopt the transmitting station clock signal recovering to carry out image decoding to the described CVBS with the second sample rate, obtain image output.
Analog to digital converter 205 carries out analog-to-digital conversion according to local clock signal, and its sample rate is M1.Because CVBS generates according to transmitting station clock at transmitting station lateral root, only have according to transmitting station clock and could decode and the correct image that shows.Therefore, image decoder 210 is decoded according to the transmitting station clock recovering, and its sample rate is M2.Because M1 is not equal to M2, need to carry out the conversion of sample rate, in the embodiment of the present invention, by increased the conversion that Farrow filter 211 is realized sample rate before image decoder 210.Farrow filter be a kind of realize any fractional delay efficiently, the filter of sample rate conversion flexibly.
In embodiments of the present invention, local clock and the transmitting station clock that recovers will determine the value of the resampling factor of Farrow filter.Below provide a kind of modular structure of concrete clock recovery device, and provide and realize accordingly principle.
As shown in Figure 3, clock recovery device 208 comprises the phase-locked loop consisting of phase difference extractor 304, loop filter 305 and numerical frequency oscillator 306.In CVBS signal, every fixing a period of time, have line synchronizing signal, line synchronizing signal has width and height (level) fixing feature so that receiver identification.Spacing between line synchronizing signal is fixed, if the clock recovering is synchronizeed with TV station transmit clock, the clock recovering with this so goes the spacing between several line synchronizing signals, and result should be consistent with the standard value of the line synchronizing signal spacing of received anolog TV signals; Otherwise if asynchronous, result is inconsistent with standard so.
Wherein, the spacing of the line synchronizing signal in the described CVBS of described detection is specially: according to the transmitting station clock recovering from numerical frequency oscillator 306, the spacing of the line synchronizing signal in CVBS is counted.
Described difference exports loop filter 305 to as phase signal.
The clock that Farrow filter 211 input data are used with output data acquisition is different, causes the speed of Farrow filter 211 input data and the speed of output data inconsistent, therefore needs 301 pairs of data of asynchronous first-in first-out (FIFO) buffer memory to cushion.
For numerical frequency oscillator 306, suppose that the reference frequency cycle of the local clock signal that local clock generator 207 produces is T1, from the difference on the frequency of loop filter 305, are P
e, P
esigned number, that is to say that difference on the frequency may be plus or minus, and the clock cycle of the transmitting station recovering is so (T1+K
p* P
e), K wherein
pfor configurable coefficient, can rule of thumb be configured.K
p* P
eit is difference on the frequency correction term.Difference on the frequency correction term, along with the operation of numerical frequency oscillator 306 is constantly accumulated, is often accumulated to a reference period (T1), is equivalent to the resampling factor and adjusts an integral point.
For making the decoding of image energy accurate synchronization, need to guarantee that numerical frequency oscillator 306 and Farrow filtration module 303 adjustment steps are consistent, so phase difference is converted the formula of the resampling factor of Farrow filtration module 303, be:
The resampling factor=1-(K
p* P
e)/T1.
Ideally, if the resampling factor is calculated accurately, the input data rate of Farrow filtration module 303 is consistent with output data rate, the half that the data of inputting so reach the asynchronous FIFO degree of depth starts output, and the data depth of asynchronous FIFO 301 storages can remain near centre position; But the restriction due to numerical frequency oscillator 306 and Farrow filtration module 303 precision, can not guarantee input data rate and the output data rate Complete Synchronization of Farrow filtration module, the data depth of asynchronous FIFO 301 storages can continue to become large or diminish so, until data volume is overflowed or the data volume of storing is 0, and then may cause image decoding distortion, therefore the size that the data depth that asynchronous FIFO 301 will be stored because of the period of the day from 11 p.m. to 1 a.m in calculating resampling depart from asynchronous FIFO 301 centre positions takes into account, to improve computational accuracy.
The half that the data of above-mentioned input reach the asynchronous FIFO degree of depth starts to export data, is only execution mode preferably, and not in order to limit the present invention, the optional position that can reach in the data of input the asynchronous FIFO degree of depth starts to export data.
Consider that the resampling factor computing formula after the asynchronous FIFO degree of depth is:
The resampling factor=1-K
p* P
e/ T1+K
d* δ D
f,
Wherein, K
d* δ D
fcorrection term for asynchronous FIFO degree of depth counterweight decimation factor; Concrete, K
dfor configurable coefficient, can rule of thumb be configured; δ D
fwhile starting to export data for the data depth of asynchronous FIFO 301 storage and asynchronous FIFO 301, store the bias of data, the data volume of storing when the data volume-asynchronous FIFO 301 that equals asynchronous FIFO 301 current storages starts to export data, if the data of input reach a half of the asynchronous FIFO degree of depth, start output, the data volume of storing when described asynchronous FIFO 301 starts to export data is half of the asynchronous FIFO degree of depth.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (7)
1. a receive decoding method for anolog TV signals, is characterized in that, the anolog TV signals of antenna reception after filter, low noise amplifier and zero intermediate frequency transducer are processed, are handled as follows successively:
Adopt receiving terminal local clock signal to carry out successively analog-to-digital conversion to described anolog TV signals, obtain having the digitized anolog TV signals of the first sample rate;
The described digitized anolog TV signals with the first sample rate are carried out to demodulation, obtain having composite video broadcast singal CVBS and the audio signal of the first sample rate;
Adopt receiving terminal local clock signal to carry out voice codec to described audio signal, obtain sound output; And
According to local clock signal and described in there is the first sample rate CVBS recover transmitting station clock signal, by the described sample rate conversion with the CVBS of the first sample rate, be the CVBS with the second sample rate, described the second sample rate with described in the transmitting station clock signal that recovers mate; Then adopt the transmitting station clock signal recovering to carry out image decoding to the described CVBS with the second sample rate, obtain image output.
2. method according to claim 1, is characterized in that, described is that the CVBS with the second sample rate is by the described sample rate conversion with the CVBS of the first sample rate:
Farrow filter has the CVBS of the first sample rate described in receiving, and according to the transmitting station clock signal recovering, the received CVBS with the first sample rate is converted to the CVBS with the second sample rate.
3. the receipt decoding device of anolog TV signals, comprise antenna (201), filter (202), low noise amplifier (203), zero intermediate frequency transducer (204), analog to digital converter (205), demodulator (206), local clock generator (207), clock recovery device (208), voice decoder (209) and image decoder (210), it is characterized in that, described device also comprises Farrow filter (211)
The anolog TV signals that antenna (201) receives export analog to digital converter (205) to successively after filter (202), low noise amplifier (203) and zero intermediate frequency transducer (204) are processed; Analog to digital converter (205) receives the local clock signal from local clock generator (207), according to described local clock signal, received anolog TV signals is carried out to the digitized anolog TV signals that analog-to-digital conversion obtains having the first sample rate;
Demodulator (206), for the described digitized anolog TV signals with the first sample rate being carried out to demodulation according to the local clock signal from local clock generator (207), obtain having composite video broadcast singal CVBS and the audio signal of the first sample rate; The described CVBS with the first sample rate exports Farrow filter (211) and clock recovery device (208) to, and described audio signal exports voice decoder (209) to;
Clock recovery device (208), for according to from the local clock signal of local clock generator (207) and described in there is the first sample rate CVBS recover transmitting station clock signal, and export respectively the described transmitting station clock signal recovering to Farrow filter (211) and image decoder (210);
Voice decoder (209) carries out voice codec according to the local clock signal from local clock generator (207) to received audio signal, obtains and output sound;
Farrow filter (211) is according to the transmitting station clock signal recovering from clock recovery device (208), the received CVBS with the first sample rate is converted to the CVBS with the second sample rate, and exports the described CVBS with the second sample rate to image decoder (210); Described the second sample rate with described in the transmitting station clock signal that recovers mate;
Image decoder (210), according to the transmitting station clock signal recovering from clock recovery device (208), carries out image decoding to the received CVBS with the second sample rate, obtains and output image.
4. device according to claim 3, is characterized in that, described clock recovery device (207) comprises the phase-locked loop consisting of phase difference extractor (304), loop filter (305) and numerical frequency oscillator (306); Wherein,
Phase difference extractor (304), spacing for detection of the line synchronizing signal in the CVBS with the first sample rate receiving, and calculate the poor of spacing between described line synchronizing signal and the analogue television standards definition value setting in advance, described difference is exported as phase signal;
Loop filter (305), for receiving described phase difference, according to the historical phase difference of the phase difference receiving and self storage, draws the difference on the frequency of local clock signal and transmitting station clock signal;
Numerical frequency oscillator (306), for difference on the frequency and the local clock signal of exporting according to loop filter 305, recover transmitting station clock signal, and the described transmitting station clock signal recovering is sent to Farrow filter (211), and feed back to phase difference extractor (304).
5. device according to claim 4, is characterized in that, described clock recovery device (207), also for exporting described difference on the frequency signal to Farrow filter (211);
Described Farrow filter (211) comprising: asynchronous first-in first-out FIFO buffer memory (301), resampling factor computing module 302 and Farrow filtration module (303);
Described asynchronous FIFO buffer memory (301), for receiving and buffer memory has the CVBS of the first sample rate, and export CVBS to the Farrow filtration module (303) of buffer memory, and the bias of storing data by the data depth of self storage and while self starting to export data is sent to resampling factor computing module (302);
Described resampling factor computing module (302), the difference on the frequency calculated signals resampling factor for basis from clock recovery device (207), and export the calculated resampling factor to Farrow filtration module (303);
Farrow filtration module (303), the transmitting station clock signal recovering for basis from clock recovery device (207), read the CVBS with the first sample rate of buffer memory in asynchronous FIFO buffer memory (301), and resample according to the CVBS described in the resampling factor pair from resampling factor computing module (302) with the first sample rate, obtain having the CVBS of the second sample rate.
6. device according to claim 5, is characterized in that, resampling factor computing module (302) calculates the resampling factor according to following formula:
The resampling factor=1-(K
p* P
e)/T1
Wherein, T1 is the reference frequency cycle of local clock signal, P
eit is described difference on the frequency; K
pfor configurable coefficient.
7. device according to claim 5, is characterized in that, resampling factor computing module (302) calculates the resampling factor according to following formula:
The resampling factor=1-K
p* P
e/ T1+K
d* δ D
f, T1 is the reference frequency cycle of local clock signal, P
eit is described difference on the frequency; K
pfor configurable coefficient;
Wherein, K
d* δ D
fcorrection term for asynchronous FIFO buffer memory (301) degree of depth counterweight decimation factor; Concrete, K
dfor configurable coefficient, can rule of thumb be configured; δ D
ffor the data depth of asynchronous FIFO buffer memory (301) storage departs from the data volume of storing when asynchronous FIFO buffer memory (301) starts to export data, the data volume of storing when the data volume-asynchronous FIFO buffer memory (301) that equals the current storage of asynchronous FIFO buffer memory (301) starts to export data.
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| CN105516631B (en) * | 2014-10-20 | 2018-06-05 | 成都振芯科技股份有限公司 | A kind of Analog Component Video signal decoding circuit of anti-vibration |
| CN105846793B (en) * | 2016-04-14 | 2019-10-08 | 北京智联安科技有限公司 | A kind of dynamically changeable time constant filter and filtering method |
| CN106231215B (en) * | 2016-07-22 | 2018-07-10 | 中仪英斯泰克进出口公司 | Analog/digital TV transmitting station system |
| CN110753255B (en) * | 2018-07-24 | 2022-07-29 | 扬智科技股份有限公司 | Transmission stream receiving device and clock frequency setting method thereof |
| CN111585543A (en) * | 2020-03-02 | 2020-08-25 | 易兆微电子(杭州)股份有限公司 | Method for realizing audio sampling rate conversion by Farrow structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1731837A (en) * | 2004-08-07 | 2006-02-08 | 金信秀 | TV receiver for portable terminal |
| CN1801905A (en) * | 2005-01-07 | 2006-07-12 | 三星电子株式会社 | Digital receivers and methods with selecting channels and fast fourier transform windows |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09214569A (en) * | 1996-02-02 | 1997-08-15 | Hitachi Ltd | Fsk base band demodulation device and moving body communication system |
| US20090167943A1 (en) * | 2007-12-27 | 2009-07-02 | Vimicro Corporation | Apparatus and Method for Synchronizing Video and Audio Data |
-
2010
- 2010-06-01 CN CN201010195756.8A patent/CN102271232B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1731837A (en) * | 2004-08-07 | 2006-02-08 | 金信秀 | TV receiver for portable terminal |
| CN1801905A (en) * | 2005-01-07 | 2006-07-12 | 三星电子株式会社 | Digital receivers and methods with selecting channels and fast fourier transform windows |
Non-Patent Citations (2)
| Title |
|---|
| JP特开平9-214569A 1997.08.15 |
| 刘巍 等.T-DMB系统中的时间模组及时序同步.《中国科技论文在线，http://www.paper.edu.cn/index.php/default/releasepaper/content/200703-74》.2007,1-6页. * |
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