CN101867740A - Sampling rate converter and conservation method for digital television baseband signals - Google Patents
Sampling rate converter and conservation method for digital television baseband signals Download PDFInfo
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Abstract
The invention discloses a sampling rate converter and a sampling rate conversion method for digital television baseband signals. The sampling rate converter comprises a data extraction module, a spectrum formation module, a ratio detection module, a ratio search module, an interpolation control module, an interpolation filter module and a regular locking detection module. In the invention, interpolation factors of the interpolation filter module are adjusted by adjusting the proportional value of a total bandwidth and a signal bandwidth, judgment is carried by the regular locking detection module, and finally, sampling frequencies are converted into symbolic frequencies. The conversion effect is good.
Description
Technical field
The present invention relates to a kind of Digital Signal Processing, particularly a kind of baseband signal sample rate converter and conversion method that is used for Digital Television reception field.
Background technology
Along with developing by leaps and bounds of information and digital technology, TV is just stepping into the total digitalization epoch.Digital Television has the efficiency of transmission height, signal quality is high and advantages such as antijamming capability is strong.QAM (QuadratureAmplitude Modulation, quadrature amplitude modulation) modulation system is generally adopted in the transmission of Digital Television.In the demodulating system of these systems, need to utilize the data that receive to realize sign synchronization.Sign synchronization is that a kind of clock of receiver and transmitter clock of making keeps synchronous method.
The high-frequency signal that data receiver receives becomes analog intermediate frequency signal through tuner, and analog intermediate frequency signal becomes digital little intermediate-freuqncy signal after changing through A/D, by carrier recovery block the little intermediate-freuqncy signal of numeral is become baseband signal again.Because the sampling clock of transmitting terminal and the sampling clock of receiving terminal are inconsistent, causing the sampling rate of baseband signal and character rate is not the integral multiple relation, so need be character rate with the sample rate conversion of baseband signal.
Summary of the invention
In view of this, being necessary to provide a kind of can be the sample rate converter and the sample rate conversion method of character rate with the sample rate conversion of digital television baseband signals.
The sample rate converter that is used for digital television baseband signals that the present invention proposes comprises:
Data extraction module is used under the control of extracting multiple the digital baseband signal of importing evenly being extracted;
Frequency spectrum forms module, is used for collecting N point from the digital baseband signal of described data extraction module output, each point is done discrete Fourier transform exports discrete spectrum, with data transaction to frequency domain, the bandwidth that on frequency domain, finds signal to occupy;
The ratio detection module, be used to detect the ratio value of frequency spectrum total bandwidth and signal bandwidth, and according to the corresponding relation of this ratio value and extracting multiple, reset the extracting multiple of described data extraction module, and data extraction module reset the ratio value that obtains after the extracting multiple as the initial proportion value;
The ratio search module, be used near the frequency spectrum ratio value that ratio detects, scanning traversal, and the method for search is " Z " font, promptly near the detected ratio value with about the rule that replaces outwards enlarge search gradually, till finding a correct ratio value;
The interpolation control module is used for the search percent information being added up output interpolation factor and data enable signal;
The interpolation filtering module is used for according to interpolation factor, data extraction module is established the data of exporting after the extracting multiple again carry out the conversion of sampling rate;
Timely lock detection module, whether effectively be used for according to the data of data enable signal decision interpolation filtering module output, and active data timely locked detection, when being judged to be non-locking, send the control signal that continues next ratio value of search to described ratio search module, when being judged to be locking, sample rate conversion is finished.
The present invention also proposes a kind of sample rate conversion method that is used for digital television baseband signals, comprises the following steps:
A receiving digital television baseband signal, the digital baseband signal to input under the control of extracting multiple evenly extracts;
B collects N point from the digital baseband signal of data extraction module output, each point is done discrete Fourier transform exports discrete spectrum, with data transaction to frequency domain, the bandwidth that on frequency domain, finds signal to occupy;
C detects the ratio value of frequency spectrum total bandwidth and signal bandwidth, and according to the corresponding relation of this ratio value and extracting multiple, reset the extracting multiple of described data extraction module, and data extraction module reset the ratio value that obtains after the extracting multiple as the initial proportion value;
D scans traversal near the frequency spectrum ratio value that ratio detects, and the method for search is " Z " font, promptly near the detected ratio value with about the rule that replaces outwards enlarge search gradually, till finding a correct ratio value;
E adds up to the search percent information, and output interpolation factor and data enable signal;
F establishes the data of exporting after the extracting multiple again with data extraction module and carries out the conversion of sampling rate according to interpolation factor;
Whether g is effective according to the data of data enable signal decision interpolation filtering module output, and active data timely locked detection, when being judged to be non-locking, send the control signal that continues next ratio value of search to described ratio search module, when being judged to be locking, sample rate conversion is finished.
Sample rate converter provided by the invention is adjusted the interpolation factor of interpolation filtering module by the ratio value of adjusting total bandwidth and signal bandwidth, utilize again and timely lock detection module and judge, finally finish sample frequency and convert symbol frequency to, conversion effect is good.
Description of drawings
The present invention is described in detail below in conjunction with embodiment and accompanying drawing, wherein:
Fig. 1 is the structured flowchart of the sample rate converter that proposes of the present invention;
Fig. 2 is that the ratio among the present invention detects schematic diagram;
Fig. 3 is that the extracting multiple among the present invention is selected flow chart;
Fig. 4 is the schematic diagram of the search ratio value obtain manner among the present invention;
Fig. 5 is the schematic diagram of the interpolation control module among the present invention;
Fig. 6 is the schematic diagram of the interpolation filtering construction module among the present invention;
Fig. 7 is the schematic diagram that timely locks detection module among the present invention.
Embodiment
See also Fig. 1, the sample rate converter 100 that the present invention proposes comprises that a data abstraction module 101, frequency spectrum form module 102, ratio detection module 103, ratio search module 104, interpolation control module 105, interpolation filtering module 106 and one and timely lock detection module 107.
Described data extraction module 101 is used to receive digital baseband signal, and its default initial value is 1 extracting multiple.When extracting multiple was initial value, described data extraction module 101 was exported to described frequency spectrum with data and is formed module 102; When extracting multiple was provided with once more, data are exported to described interpolation filtering module 106 to described data extraction module 101 simultaneously and described frequency spectrum forms module 102.Certainly, described data extraction module 101 also can all be exported to data described interpolation filtering module 106 before and after extracting multiple changes, but this moment, described interpolation filtering module 106 needed whether judgment data abstraction module 101 is to send digital baseband signal for the first time, sent digital baseband signal for the first time then will not receive if be judged as.The initial value of described data extraction module 101 is 1, and expression is not extracted digital baseband signal first.
Described frequency spectrum forms module 102 and is used for collecting a plurality of points from the digital baseband signal of described data extraction module 101 outputs, each point is done the discrete spectrum that discrete Fourier transform obtains data, and export to described ratio detection module 103.In the present embodiment, described frequency spectrum forms module 102 and collects 128 points.Certainly, described frequency spectrum forms module 102 and also can collect 256 or 512 points.
In the present embodiment, the total bandwidth of the discrete spectrum of described frequency spectrum formation module 102 outputs and the ratio value first time of signal bandwidth are made as and do not extract ratio value.See also Fig. 2, the total number of discrete spectrum point that forms the discrete spectrum of module 102 outputs with described frequency spectrum is 128, and it is example that signal discrete frequency spectrum point is 30.The shared bandwidth of A representation signal wherein, i.e. the bandwidth of the character rate of signal, B represents total bandwidth, i.e. the bandwidth of sampling rate.The unit of this bandwidth represents that with the number of discrete spectrum point the width of A has occupied 30 discrete spectrum points, and the bandwidth that then claims signal is 30; Owing to adopted 128 discrete Fourier transform, so total bandwidth is 128.The not extraction ratio value that described ratio detection module 103 calculates is 128/30.
See also Fig. 3, this is not extracted ratio value be defined as p.Default a plurality of piecewise intervals in the described ratio detection module 103.Because satisfy nyquist sampling theorem, so sampling rate is at least the twice of character rate, so the value of p necessarily greater than 2, and integral multiple that neither character rate in the present embodiment.In the present embodiment, the piecewise interval of described ratio detection module 103 comprises 2＜p＜4,4＜p＜6,6＜p＜9,9＜p＜12,12＜p＜15 etc.When 2＜p＜4, the extracting multiple that described ratio detection module 103 is provided with described data extraction module 101 is 1, and expression is not extracted data.When 4＜p＜6, the extracting multiple that described ratio detection module 103 is provided with described data extraction module 101 is 2, promptly gets a point as effectively exporting and being even output in per two points; When 6＜p＜9, the extracting multiple that described ratio detection module 103 is provided with described data extraction module 101 is 3; When 9＜p＜12, the extracting multiple that described ratio detection module 103 is provided with described data extraction module 101 is 4; When 12＜p＜15, the extracting multiple that described ratio detection module 103 is provided with described data extraction module 101 is 5, by that analogy.
In the present embodiment, after described ratio detection module 103 is provided with the extracting multiple of described data extraction module 101, make described data extraction module 101 carry out extraction operation.Data after described data extraction module 101 will extract are exported to described frequency spectrum and are formed module 102 and interpolation filtering module 106.Described frequency spectrum forms module 102 and described ratio detection module 103 is operated according to the data of described data extraction module 101 outputs again, obtains described initial proportion value.Increase to some extent because account for the proportion of total bandwidth through inromation bandwidth after extracting, so the initial proportion value that the data computation after process data extraction module 101 extracts goes out than the not extraction ratio value that calculates for the first time more accurately.Described ratio detection module 103 is exported to ratio search module 104 with the initial proportion value, as shown in Figure 1.
Described ratio search module 104, be used to increase a step value as the search ratio value, when increasing first, the initial proportion value is increased a step value, when increasing once more, the search ratio value of last time is increased by a step value, and this step value and the last step value sign opposite in sign that increases, the many step-lengths of the last step value that increases of size.See also Fig. 4, the residing position of initial proportion value is represented in the position of the described longitudinal axis, and label is that 1 point is represented the ratio value after the initial proportion value increases a step value, promptly searches for ratio value; Label is that 2 point is represented the ratio value after first search ratio value increases a step value, and label is that 3 point is represented the ratio value after second search ratio value increases a step value.In the present embodiment, this step value is followed successively by 1, and-2,3 ,-4,5 ,-6,7 ,-8.
Interpolation filtering module 106 is used for according to interpolation factor data extraction module 101 being established the data of exporting after the extracting multiple again and carries out the conversion of sampling rate.In the present embodiment, described interpolation filtering module 106 adopts the sectional parabola interpolater, and as shown in Figure 6, certainly, described interpolation filtering module 106 can also be triangle interpolater, cube interpolater etc.
Whether timely lock detection module 107 is used for according to the data of data enable signal decision interpolation filtering module 106 outputs effective, and active data timely locked detection, when being judged to be non-locking, send the control signal that increases the ratio value step-length to described ratio search module 104, when being judged to be locking, sample rate conversion is finished.In the present embodiment, the described structure that timely locks detection as shown in Figure 7.The described detection module 107 that timely locks is poor with remaking after first respectively square of former and later two data of the data after the interpolation, 2000 differences are added up try to achieve mean value and lock-in threshold relatively,, this value illustrates that the search ratio value is correct if being higher than lock-in threshold, with sampled data rate transition to 2 times character rate, sampling rate is locked for described interpolation filtering module 106.Search ratio value mistake if being lower than lock-in threshold, this value is described, sampling rate is not locked, the simultaneously described detection module 107 that timely locks sends the control signal that increases the ratio value step-length to described ratio search module 104, and described ratio search module 104 will generate new search ratio value after receiving control signal.
See also Fig. 8, be the flow chart of sample rate conversion method, concrete steps are as follows:
Step S110: receive digital baseband signal.In the present embodiment, utilize described data extraction module 101 to receive digital baseband signal.
Step S112: from the digital baseband signal that receives, collect N point, each point is done the discrete spectrum that discrete Fourier transform obtains data.In the present embodiment, described data extraction module 101 does not extract digital baseband signal for the first time, directly the digital baseband signal that receives is transferred to frequency spectrum and forms module 102.Described frequency spectrum forms 128 points that module 102 is collected in the digital baseband signal, and each point is done the discrete spectrum that discrete Fourier transform obtains data.Certainly, described frequency spectrum forms module 102 and also can collect 256 or 512 points.
Step S114: calculate the total bandwidth of discrete spectrum in the discrete spectrum and the ratio value of signal bandwidth, and obtain the corresponding extracting multiple of ratio value according to the preset proportional value and the corresponding relation of extracting multiple.In the present embodiment, utilize described ratio detection module 103 to calculate the ratio value of total bandwidth and signal bandwidth in the discrete spectrums, default piecewise interval in the described ratio detection module 103, described ratio detection module 103 is provided with the extracting multiple of described data extraction module 101 according to the position of ratio value in piecewise interval.
Step S116: digital baseband signal is extracted according to the extracting multiple of resetting.In the present embodiment, described abstraction module 101 extracts digital baseband signal according to the extracting multiple that described ratio detection module 103 is provided with.
Step S118: collect a plurality of points the digital baseband signal after extracting, each point is done the discrete spectrum that discrete Fourier transform obtains data.This step and step S112 are basic identical, and difference is to handle is digital baseband signal after extracting.
Step S120: the total bandwidth of the discrete spectrum of the digital baseband signal after calculating is extracted and the ratio value of signal bandwidth are as the initial proportion value.Described ratio detection module 103 obtains described initial proportion value according to the discrete spectrum of the digital baseband signal after extracting.
Step S122: described initial proportion value is increased by a step value as the search ratio value.In the present embodiment, described ratio search module 104 increases by a step value with the initial proportion value and obtains searching for ratio value, and will search for ratio value and export to described interpolation control module 105.
Step S124: obtain data enable signal and interpolation factor according to the search ratio value.In the present embodiment, the ratio value input interpolation control module 105 of described ratio search module 104 outputs multiplies each other with 0.5 earlier, multiplied result and 1 is subtracted each other, result after subtracting each other is added up, when reaching 1, accumulated value enables invalid signals to described detection module 107 dateouts that timely lock, the data of representing current described interpolation filtering module 106 interpolations output are invalid, and deduct a sampled point; Otherwise dateout enables useful signal.The result that accumulated value removes after the integer part is called interpolation factor, exports to interpolation filtering module 106.
Step S126:, the digital baseband signal that extracts is carried out the conversion of sampling rate according to interpolating method according to interpolation factor.In the present embodiment, utilize the sectional parabola interpolater digital baseband signal after extracting to be carried out the conversion of sampling rate according to interpolation factor.
Step S128: whether the judgment data enable signal is effective, and described what timely lock that detection module 107 judges described interpolation control module 105 outputs is data enable useful signal or data enable invalid signals.
Step S130: when data enable signal when enabling useful signal, utilize to timely lock detection method and judge that can the sampling rate of conversion locked.In the present embodiment, when described timely lock detection module 107 judge described interpolation control module 105 outputs be the data enable useful signal time, poor with remaking after first respectively square of former and later two data of data after described interpolation filtering module 106 interpolations, 2000 differences are added up try to achieve mean value and lock-in threshold relatively,, this value illustrates that the search ratio value is correct if being higher than lock-in threshold, with sampled data rate transition to 2 times character rate, sampling rate is locked for described interpolation filtering module 106; Otherwise search ratio value mistake, sampling rate is not locked.
Step S132: when sampling rate is judged as non-locking, described search ratio value is increased by a step value, forward to according to the search ratio value obtain in the step of data enable signal and interpolation factor.In the present embodiment, described ratio search module 104 will be searched for ratio value increases the step value that the sign direction is opposite, and the size of this step value forwards step 124 to than step-length of step value increase last time.
In step S128, when the data enable signal of judging when enabling invalid signals, return step S124 and obtain data enable signal again.In step S130, when utilization timely locks detection method when judging that the sampling rate of conversion can be locked, sample rate conversion is finished.
Sample rate converter provided by the invention is adjusted the interpolation factor of interpolation filtering module by the ratio value of adjusting total bandwidth and signal bandwidth, utilize again to timely lock detection module and judge, thus can be so that the interpolation filtering module can convert sample frequency to symbol frequency.
Be to be understood that, for the person of ordinary skill of the art, can make other various corresponding changes and distortion by technical conceive according to the present invention, and all these change the protection range that all should belong to claim of the present invention with distortion.
Claims (10)
1. sample rate converter that is used for digital television baseband signals is characterized in that comprising:
Data extraction module is used under the control of extracting multiple the digital baseband signal of importing evenly being extracted;
Frequency spectrum forms module, is used for collecting N point from the digital baseband signal of described data extraction module output, each point is done discrete Fourier transform exports discrete spectrum, with data transaction to frequency domain, the bandwidth that on frequency domain, finds signal to occupy;
The ratio detection module, be used to detect the ratio value of frequency spectrum total bandwidth and signal bandwidth, and according to the corresponding relation of this ratio value and extracting multiple, reset the extracting multiple of described data extraction module, and data extraction module reset the ratio value that obtains after the extracting multiple as the initial proportion value;
The ratio search module, be used near the frequency spectrum ratio value that ratio detects, scanning traversal, and the method for search is " Z " font, promptly near the detected ratio value with about the rule that replaces outwards enlarge search gradually, till finding a correct ratio value;
The interpolation control module is used for the search percent information being added up output interpolation factor and data enable signal;
The interpolation filtering module is used for according to interpolation factor, data extraction module is established the data of exporting after the extracting multiple again carry out the conversion of sampling rate;
Timely lock detection module, whether effectively be used for according to the data of data enable signal decision interpolation filtering module output, and active data timely locked detection, when being judged to be non-locking, send the control signal that continues next ratio value of search to described ratio search module, when being judged to be locking, sample rate conversion is finished.
2. sample rate converter as claimed in claim 1, it is characterized in that: when initial extracting multiple is set at 1, described data extraction module is directly exported to described frequency spectrum with data and is formed module, when extracting multiple was provided with once more, data are exported to described interpolation filtering module to described data extraction module simultaneously and described frequency spectrum forms module.
3. sample rate converter as claimed in claim 1, it is characterized in that: default piecewise interval in the described ratio detection module, described ratio detection module does not extract the extracting multiple that the position of ratio value in piecewise interval is provided with described data extraction module according to described.
4. sample rate converter as claimed in claim 1 is characterized in that: the unit of bandwidth represents with the number of discrete spectrum point in the described ratio detection module.
5. sample rate converter as claimed in claim 1 is characterized in that, described interpolation filtering module adopts the sectional parabola interpolater.
6. a sample rate conversion method that is used for digital television baseband signals is characterized in that comprising the following steps:
A receiving digital television baseband signal, the digital baseband signal to input under the control of extracting multiple evenly extracts;
B collects N point from the digital baseband signal of data extraction module output, each point is done discrete Fourier transform output discrete spectrum, and be converted to frequency domain, the bandwidth that finds signal to occupy on frequency domain;
C detects the ratio value of frequency spectrum total bandwidth and signal bandwidth, and according to the corresponding relation of this ratio value and extracting multiple, reset the extracting multiple of described data extraction module, and data extraction module reset the ratio value that obtains after the extracting multiple as the initial proportion value;
D scans traversal near the frequency spectrum ratio value that ratio detects, and the method for search is " Z " font, promptly near the detected ratio value with about the rule that replaces outwards enlarge search gradually, till finding a correct ratio value;
E adds up to the search percent information, and output interpolation factor and data enable signal;
F establishes the data of exporting after the extracting multiple again with data extraction module and carries out the conversion of sampling rate according to interpolation factor;
Whether g is effective according to the data of data enable signal decision interpolation filtering module output, and active data timely locked detection, when being judged to be non-locking, send the control signal that continues next ratio value of search to described ratio search module, when being judged to be locking, sample rate conversion is finished.
7. sample rate conversion method as claimed in claim 6 is characterized in that: among the step e, when data enable signal when enabling invalid signals, forward to according to the search ratio value and obtain in the step of data enable signal and interpolation factor.
8. sample rate conversion method as claimed in claim 6, it is characterized in that: when initial extracting multiple is set at 1, described data extraction module is directly exported to described frequency spectrum with data and is formed module, when extracting multiple was provided with once more, data are exported to described interpolation filtering module to described data extraction module simultaneously and described frequency spectrum forms module.
9. sample rate conversion method as claimed in claim 6 is characterized in that: the unit of described total bandwidth and signal bandwidth represents with the number of discrete spectrum point.
10. sample rate conversion method as claimed in claim 6 is characterized in that: among the step f, use the sectional parabola interpolater to carry out the conversion of sampling rate.
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Cited By (2)
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| CN108663555A (en) * | 2017-03-29 | 2018-10-16 | 苏州普源精电科技有限公司 | A kind of the waveform searching method and digital oscilloscope of digital oscilloscope |
| CN111817822A (en) * | 2020-09-08 | 2020-10-23 | 深圳市鼎阳科技股份有限公司 | Device and method for providing NR baseband signal |
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