CN108174194A - A kind of broadcast transmitter amplitude-frequency response index measurement method and device - Google Patents
A kind of broadcast transmitter amplitude-frequency response index measurement method and device Download PDFInfo
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- CN108174194A CN108174194A CN201810010014.XA CN201810010014A CN108174194A CN 108174194 A CN108174194 A CN 108174194A CN 201810010014 A CN201810010014 A CN 201810010014A CN 108174194 A CN108174194 A CN 108174194A
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- transmitter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems
Abstract
The invention discloses a kind of broadcast transmitter amplitude-frequency response index real-time online measuring method, including step in detail below：The input data x (t) of acquisition transmitter and corresponding output data y (t) in real time；According to the input data x (t) and corresponding output data y (t), system delay τ of the signal by the transmitter is determined；With reference to the system delay τ, the amplitude-frequency response of the transmitter is calculated；Show and store the amplitude-frequency response.Measurand transmitter amplitude-frequency response method proposed by the present invention ensure that the accuracy and timeliness of transmitter operation data, and be capable of the working condition of real time on-line monitoring transmitter, and alarm can be provided in time when transmitter breaks down.
Description
Technical field
The present invention relates to TV and radio emission machine automatic test field, more particularly to a kind of broadcast transmitter amplitude-frequency response
Index measurement method and device.
Background technology
AM broadcast transmitters are the important components in radio data system, to ensure transmitter broadcast quality, it is necessary to
Adhere to periodically testing indicator transmitter, to be directed to the problem of occurred, be adjusted in time.Traditional manual measurement
The method of harmonics of tranmitter distortion is, according to People's Republic of China (PRC) radio, film and television industry standard GY/T 225-2007's
It is required that in the non-broadcast slot of transmitter, the output power of transmitter is adjusted to rated output power, with 1000Hz sinusoidal signals pair
Transmitter is modulated, and the modulation of short-wave transmitter is 75%, amplitude modulation factors of medium wave transmitters 95%, will audio analysis at this time
The level that instrument is measured is as reference level 0dB.According to measurement frequency as defined in standard, the level for keeping input signal is constant, by
Audio analyzer measures the frequency response of each frequency.Since the degree that tester grasps measuring method is different, to instrument
The qualification of operation is different, causes the uncertainty of time of measuring and measurement result, has that efficiency is low, data storage is inconvenient
With it is more demanding to tester the shortcomings of.
Invention content
The purpose of the present invention is to provide a kind of broadcast transmitter amplitude-frequency response index measurement method, to solve above-mentioned background
The problem of being proposed in technology.
To achieve the above object, the present invention provides following technical solution：A kind of broadcast transmitter amplitude-frequency response index measurement
Method, including：
Step 1, the input data x (t) of transmitter and corresponding output data y (t) are acquired in real time；
Step 2, according to the input data x (t) and corresponding output data y (t), determine that signal passes through the transmitter
System delay τ；
Step 3, with reference to the system delay τ, the amplitude-frequency response of the transmitter is calculated；
Step 4, show and store the amplitude-frequency response.
In an illustrative embodiments, the transmitter is none distortion linear system, output signal and input signal
Between amplitude into certain multiple, and pass through system generate delay be fixed value.
In an illustrative embodiments, the step 1-4 is performed according to the setting period.
In an illustrative embodiments, step 2 includes：
Discrete series x (n) is obtained after sampled to the x (t)；
Discrete series y (n) is obtained after the y (t) is sampled；
Determine the x (n), y (n) cross-correlation function Rxy(D)；
Determine the Rxy(D) corresponding D, the system delay τ that as signal passes through the transmitter when maximum.
In an illustrative embodiments, step 3 includes：
M points are intercepted by rectangular window to discrete signal x (n) and y (n), wherein M is real number, obtain a length be M from
Sequence x [n] and y [n], 0≤n≤M-1 are dissipated,
N points DFT, N are to x [n]>M, N are real number, obtain the discrete spectrum X [k] of x [n] and y [n] and Y [k]；
Y [n] since τ is intercepted into N- τ points, obtains yN-τ[n], to yN-τ[n] is N points DFT and obtains Y (k) ', by X (k)
X (e are obtained with Y (k) 'jω) and Y (ejω), obtain the amplitude-frequency response of system
The embodiment of the present invention also provides a kind of broadcast transmitter amplitude-frequency response instrument for measuring index, including：
Collecting unit, for acquiring the input data x (t) of transmitter and corresponding output data y (t) in real time；
Determination unit, for according to the input data x (t) and corresponding output data y (t), determining that signal passes through institute
State the system delay τ of transmitter；
Computing unit, for reference to the system delay τ, calculating the amplitude-frequency response of the transmitter；
Display unit, for showing and storing the amplitude-frequency response.
In an illustrative embodiments, the transmitter is none distortion linear system, output signal and input signal
Between amplitude into certain multiple, and pass through system generate delay be fixed value.
In an illustrative embodiments, the collecting unit performs acquisition according to the setting period.
In an illustrative embodiments, determination unit is used for：
Discrete series x (n) is obtained after sampled to the x (t)；
Discrete series y (n) is obtained after the y (t) is sampled；
Determine the x (n), y (n) cross-correlation function Rxy(D)；
Determine the Rxy(D) corresponding D, the system delay τ that as signal passes through the transmitter when maximum.
In an illustrative embodiments, computing unit is used for：
M points are intercepted by rectangular window to discrete signal x (n) and y (n), wherein M is real number, obtain a length be M from
Sequence x [n] and y [n], 0≤n≤M-1 are dissipated,
N points DFT, N are to x [n]>M, N are real number, obtain the discrete spectrum X [k] of x [n] and y [n] and Y [k]；
Y [n] since τ is intercepted into N- τ points, obtains yN-τ[n], to yN-τ[n] is N points DFT and obtains Y (k) ', by X (k)
X (e are obtained with Y (k) 'jω) and Y (ejω), obtain the amplitude-frequency response of system
The technique effect and advantage of the present invention：
1st, measurand transmitter amplitude-frequency response method proposed by the present invention is the acquisition hair in the case where transmitter works normally
Machine inputoutput data is penetrated, harmonics of tranmitter distortion measurement algorithm according to the present invention carries out calculation process to data, will test
As a result it is shown and is stored；
2nd, measuring method of the invention does not influence the normal work of transmitter, and interface is had by oneself with equipment, directly acquisition hair
The input/output signal of machine is penetrated, ensure that the accuracy and timeliness of transmitter operation data, and being capable of real time on-line monitoring
The working condition of transmitter can provide alarm in time when transmitter breaks down；
3rd, with the popularization of digital broadcasting, traditional apparatus testing method cannot meet the test of digital broadcast equipment
Demand, so the measurand transmitter amplitude-frequency response method of the present invention has certain practical significance.
Description of the drawings
Fig. 1 is a kind of transmitter amplitude-frequency response measuring method flow chart provided in an embodiment of the present invention.
Fig. 2 is another transmitter amplitude-frequency response measuring method flow chart provided in an embodiment of the present invention.
Fig. 3 is a kind of transmitter amplitude-frequency response measuring device structure diagram provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the present invention provides a kind of broadcast transmitter amplitude-frequency response index measurement method, including：
S101 acquires the input data x (t) of transmitter and corresponding output data y (t) in real time；
S102 according to the input data x (t) and corresponding output data y (t), determines that signal passes through the transmitter
System delay τ；
S103 with reference to the system delay τ, calculates the amplitude-frequency response of the transmitter；
S104 shows and stores the amplitude-frequency response.
In an illustrative embodiments, the transmitter is none distortion linear system, output signal and input signal
Between amplitude into certain multiple, and pass through system generate delay be fixed value.
In an illustrative embodiments, the step 1-4 is performed according to the setting period, i.e., periodically carries out broadcast hair
Penetrate machine amplitude-frequency response index measurement.
In an illustrative embodiments, S102 includes：
Discrete series x (n) is obtained after sampled to the x (t)；
Discrete series y (n) is obtained after the y (t) is sampled；
Determine the x (n), y (n) cross-correlation function Rxy(D)；
Determine the Rxy(D) corresponding D, the system delay τ that as signal passes through the transmitter when maximum.
In an illustrative embodiments, S103 includes：
M points are intercepted by rectangular window to discrete signal x (n) and y (n), wherein M is real number, obtain a length be M from
Sequence x [n] and y [n], 0≤n≤M-1 are dissipated,
N points DFT, N are to x [n]>M, N are real number, obtain the discrete spectrum X [k] of x [n] and y [n] and Y [k]；
Y [n] since τ is intercepted into N- τ points, obtains yN-τ[n], to yN-τ[n] is N points DFT and obtains Y (k) ', by X (k)
X (e are obtained with Y (k) 'jω) and Y (ejω), obtain the amplitude-frequency response of system
As shown in Fig. 2, in another embodiment of the present invention, a kind of broadcast transmitter amplitude-frequency response index measurement side
Method, transmitter input terminal are equipped with audio stream, and transmitter will meet a none distortion linear system, then output signal and input signal
Between amplitude into certain multiple, and pass through system generate delay be fixed value.The audio stream input signal is x (t),
The x (t) is through fsDiscrete series x (n) is obtained after sampling, output signal is y (t) after the emitted machine of x (t), and the y (t) is through fs
Discrete series y (n), the x (n) and y (n) are obtained after sampling with broadcast transmitter amplitude-frequency response index real-time online measuring method
Harmonics of tranmitter distortion is calculated, and result is shown and stored, also there are systems in the transmission for the harmonics of tranmitter distortion
Time delay, system additivity noise and system gain, the Time Delay of Systems are set as τ, and system additivity noise is set as n (t), and system increases
Benefit is set as α.
Y (t)=α x (t- τ)+n (t) formulas 1
System shock response is h (t), then：
Y (t)=x (t- τ) * h (t)=x (t) * h (t- τ) formula 2
If x (t), y (t) meets absolute integrable condition, F [x (t)]=x (j ω), F [h (t)]=H (j ω), F [y (t)]=
Y (j ω), wherein F [*] represent Fourier transformation, and carrying out Fourier transformation to 2 both sides of formula can obtain：
Y (j ω)=x (j ω) e-jωτH(jω)e-jωτFormula 3
Another G (j ω)=X (j ω) e-jωτ, then formula (2-12) can be expressed as
The amplitude-frequency response of system is usually complex function, be represented by H (j ω)=| H (j ω) | ejφ(ω), amplitude function | H (j
ω) | corresponding curve is known as the amplitude-versus-frequency curve of system, and the corresponding curves of φ (ω) are known as the phase frequency of system in phase function
Characteristic curve；
By formula 4 it is found that
By formula 3 and formula 5 it is found that seeking system amplitude-frequency response | H (j ω) |, need that system input signal is first obtained and output believed
Number delay, τ；
Input signal x (n) and output signal y (n) after must being sampled by formula 2 can be expressed as,
Y (n)=α x (n- τ)+n (n) formulas 6
The cross-correlation function R of X (n) and y (n)xy(D) it is represented by
Rxy(D)=E [x (n) y (n-D)] formula 7
It brings formula 6 into formula 7, obtains
Rxy(D)=α E [x (n) x (n-D- τ)]+E [x (n) y (n-D)] formula 8
Because of x (n), n (n) is uncorrelated each other, therefore formula 8 can turn to
Rxy(D)=α E [x (n) x (n-D- τ)]=α Rs(D- τ) formula 9
It is obtained by the property of correlation function, the R as D=τxy(D) it is maximized.Therefore, R is acquiredxy(D) maximum value pair
The D answered is exactly the delay, τ of input signal x (n) and output signal y (n)；
Discrete signal x (n) and y (n) intercepts M points by rectangular window, obtains the discrete series x [n] and y that a length is M
[n], 0≤n≤M-1, if its DTFT is X (ejω) and Y (ejω), have
N point DFT are done to x [n] and y [n], the discrete spectrum X [k] of x [n] and y [n] and Y [k] are obtained, to overcome " fence "
Effect will take N>M, DFT just undistorted can recover DTFT；
Delay, τ is calculated according to formula 9, y [n] since τ is intercepted into N- τ points, obtains yN-τ[n], to yN-τ[n] is N
Point DFT obtains Y (k) ', and X (e are obtained by X (k) and Y (k) 'jω) and Y (ejω), obtain the amplitude-frequency response of system | H (ejω) |,
As shown in figure 3, the embodiment of the present invention also provides a kind of broadcast transmitter amplitude-frequency response instrument for measuring index, including：
Collecting unit 301, for acquiring the input data x (t) of transmitter and corresponding output data y (t) in real time；
Determination unit 302, for according to the input data x (t) and corresponding output data y (t), determining that signal passes through
The system delay τ of the transmitter；
Computing unit 303, for reference to the system delay τ, calculating the amplitude-frequency response of the transmitter；
Display unit 304, for showing and storing the amplitude-frequency response.
In an illustrative embodiments, the transmitter is none distortion linear system, output signal and input signal
Between amplitude into certain multiple, and pass through system generate delay be fixed value.
In an illustrative embodiments, the collecting unit 301 performs acquisition according to the setting period.
In an illustrative embodiments, determination unit 302 is used for：
Discrete series x (n) is obtained after sampled to the x (t)；
Discrete series y (n) is obtained after the y (t) is sampled；
Determine the x (n), y (n) cross-correlation function Rxy(D)；
Determine the Rxy(D) corresponding D, the system delay τ that as signal passes through the transmitter when maximum.
In an illustrative embodiments, computing unit 303 is used for：
M points are intercepted by rectangular window to discrete signal x (n) and y (n), wherein M is real number, obtain a length be M from
Sequence x [n] and y [n], 0≤n≤M-1 are dissipated,
N points DFT, N are to x [n]>M, N are real number, obtain the discrete spectrum X [k] of x [n] and y [n] and Y [k]；
Y [n] since τ is intercepted into N- τ points, obtains yN-τ[n], to yN-τ[n] is N points DFT and obtains Y (k) ', by X (k)
X (e are obtained with Y (k) 'jω) and Y (ejω), obtain the amplitude-frequency response of system
Finally it should be noted that：The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify to the technical solution recorded in foregoing embodiments or carry out equivalent replacement to which part technical characteristic,
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in the present invention's
Within protection domain.
Claims (10)
1. a kind of broadcast transmitter amplitude-frequency response index measurement method, which is characterized in that including：
Step 1, the input data x (t) of transmitter and corresponding output data y (t) are acquired in real time；
Step 2, according to the input data x (t) and corresponding output data y (t), determine that signal is by the transmitter
System delay τ；
Step 3, with reference to the system delay τ, the amplitude-frequency response of the transmitter is calculated；
Step 4, show and store the amplitude-frequency response.
2. according to the method described in claim 1, it is characterized in that, the transmitter be none distortion linear system, output signal
Amplitude between input signal is fixed value into certain multiple, and by the delay that system generates.
3. according to the method described in claim 1, it is characterized in that, the step 1-4 is performed according to the setting period.
4. according to the method described in claim 1, it is characterized in that, step 2 includes：
Discrete series x (n) is obtained after sampled to the x (t)；
Discrete series y (n) is obtained after the y (t) is sampled；
Determine the x (n), y (n) cross-correlation function Rxy(D)；
Determine the Rxy(D) corresponding D, the system delay τ that as signal passes through the transmitter when maximum.
5. according to the method described in claim 4, it is characterized in that, step 3 includes：
M points are intercepted by rectangular window to discrete signal x (n) and y (n), wherein M is real number, obtains the discrete sequence that a length is M
X [n] and y [n], 0≤n≤M-1 are arranged,
N points DFT, N are to x [n]>M, N are real number, obtain the discrete spectrum X [k] of x [n] and y [n] and Y [k]；
Y [n] since τ is intercepted into N- τ points, obtains yN-τ[n], to yN-τ[n] is N points DFT and obtains Y (k) ', by X (k) and Y
(k) ' obtain X (ejω) and Y (ejω), obtain the amplitude-frequency response of system
6. a kind of broadcast transmitter amplitude-frequency response instrument for measuring index, which is characterized in that including：
Collecting unit, for acquiring the input data x (t) of transmitter and corresponding output data y (t) in real time；
Determination unit, for according to the input data x (t) and corresponding output data y (t), determining that signal passes through the hair
Penetrate the system delay τ of machine；
Computing unit, for reference to the system delay τ, calculating the amplitude-frequency response of the transmitter；
Display unit, for showing and storing the amplitude-frequency response.
7. device according to claim 6, which is characterized in that the transmitter be none distortion linear system, output signal
Amplitude between input signal is fixed value into certain multiple, and by the delay that system generates.
8. device according to claim 6, which is characterized in that the collecting unit performs acquisition according to the setting period.
9. device according to claim 6, which is characterized in that determination unit is used for：
Discrete series x (n) is obtained after sampled to the x (t)；
Discrete series y (n) is obtained after the y (t) is sampled；
Determine the x (n), y (n) cross-correlation function Rxy(D)；
Determine the Rxy(D) corresponding D, the system delay τ that as signal passes through the transmitter when maximum.
10. device according to claim 9, which is characterized in that computing unit is used for：
M points are intercepted by rectangular window to discrete signal x (n) and y (n), wherein M is real number, obtains the discrete sequence that a length is M
X [n] and y [n], 0≤n≤M-1 are arranged,
N points DFT, N are to x [n]>M, N are real number, obtain the discrete spectrum X [k] of x [n] and y [n] and Y [k]；
Y [n] since τ is intercepted into N- τ points, obtains yN-τ[n], to yN-τ[n] is N points DFT and obtains Y (k) ', by X (k) and Y
(k) ' obtain X (ejω) and Y (ejω), obtain the amplitude-frequency response of system
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| CN103929143A (en) * | 2014-04-11 | 2014-07-16 | 深圳市东微智能科技有限公司 | Method for acquiring amplitude-frequency response characteristic of filter |
| CN105550396A (en) * | 2015-12-03 | 2016-05-04 | 北京航空航天大学 | Non-parameter system identification method based on step response correlation analysis |
| CN106331951A (en) * | 2016-08-18 | 2017-01-11 | 苏州上声电子有限公司 | Harmonic distortion measurement method and system based on continuous logarithmic swept response |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060251160A1 (en) * | 2005-01-26 | 2006-11-09 | Fazlollahi Amir H | FDR single ended line testing (SELT) system and method for DSL modems |
| CN103929143A (en) * | 2014-04-11 | 2014-07-16 | 深圳市东微智能科技有限公司 | Method for acquiring amplitude-frequency response characteristic of filter |
| CN105550396A (en) * | 2015-12-03 | 2016-05-04 | 北京航空航天大学 | Non-parameter system identification method based on step response correlation analysis |
| CN106331951A (en) * | 2016-08-18 | 2017-01-11 | 苏州上声电子有限公司 | Harmonic distortion measurement method and system based on continuous logarithmic swept response |
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