CN103344829B - A kind of simulating signal spectrum analyzer system - Google Patents
A kind of simulating signal spectrum analyzer system Download PDFInfo
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- CN103344829B CN103344829B CN201310239184.2A CN201310239184A CN103344829B CN 103344829 B CN103344829 B CN 103344829B CN 201310239184 A CN201310239184 A CN 201310239184A CN 103344829 B CN103344829 B CN 103344829B
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Abstract
The present invention relates to a kind of simulating signal spectrum analyzer system, simulating signal load module is for exporting the original analog input signal treating spectrum analysis; Bandpass filtering modules block, in described passband adjusting module passband setting range, realizes the arrowband bandpass filtering treatment to original analog input signal; Passband adjusting module, under control and frequency spectrum statistical module control, realizes the wide region continuous setup of bandpass filtering modules block bandpass center frequency; Bandlimited signal energy statistics module is synchronously added up for outputing signal energy to bandpass filtering modules block in the logical adjusting module adjustment process of band; Control the control passed through with frequency spectrum statistical module passband adjusting module, realize the bandpass filtering treatment of the continuous bandpass center frequency to original analog input signal, by the synchronous statistical function of bandlimited signal energy statistics module, complete simulating signal spectrum analysis.The present invention is applicable to the micromessage system application scenarios of low-power consumption, low cost, small size.
Description
Technical field
The present invention relates to analog signal processing technology field, particularly relate to a kind of simulating signal spectrum analyzer system.
Background technology
Spectrum analysis, also referred to as power Spectral Estimation, as the basic analyzing method of signal transacting, is widely used in the fields such as radar, sonar, communication, geology detecting, astronomy, biomedical engineering.The method of digital signal processing method many employings Fourier transform realizes, and digitized signal, by fourier decomposition, launches by frequency order, becomes the function of frequency, and then study signal in frequency field and process.The many rapid computations devices based on the contour power consumption of FPGA, DSP, cost intensive of realization of digitized spectra analytical approach realize.The factor restriction frequency spectrum analysis methods such as system power dissipation, cost and volume use in the micromessage system of low-power consumption, low cost, small size.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of simulating signal spectrum analyzer system, is applicable to the micromessage system application scenarios of low-power consumption, small size, low cost.
The technical solution adopted for the present invention to solve the technical problems is: provide a kind of simulating signal spectrum analyzer system, comprise simulating signal load module, bandpass filtering modules block, passband adjusting module, bandlimited signal energy statistics module, control and frequency spectrum statistical module, described simulating signal load module is for exporting the original analog input signal treating spectrum analysis; Described bandpass filtering modules block, in described passband adjusting module passband setting range, realizes the arrowband bandpass filtering treatment to original analog input signal; Described passband adjusting module, under described control and frequency spectrum statistical module control, realizes the wide region continuous setup of bandpass filtering modules block bandpass center frequency; Described bandlimited signal energy statistics module is synchronously added up for outputing signal energy to bandpass filtering modules block in the logical adjusting module adjustment process of band; Described control and frequency spectrum statistical module are by the control to passband adjusting module, realize the bandpass filtering treatment to the continuous bandpass center frequency of original analog input signal, by the synchronous statistical function of described bandlimited signal energy statistics module, complete simulating signal spectrum analysis.
Also be provided with impedance adjusting module between described simulating signal load module and bandpass filtering modules block, described impedance adjusting module is for realizing the impedance matching between simulating signal load module and bandpass filtering modules block.
The passband setting range covering system spectrum analysis working frequency points scope of described bandpass filtering modules block, and continuously adjustabe.
The passband Adjustment precision of described bandpass filtering modules block should higher than the requirement of system spectrum analysis precision.
Described bandlimited signal energy statistics module adopts Method for Accurate Calculation or guestimate method in the logical adjusting module adjustment process of band for synchronously adding up bandpass filtering modules block output signal energy.
Described bandlimited signal energy statistics module, in the adjustment of passband adjusting module to bandpass filtering modules block, is added up after bandpass filtering modules block stable output.
Described simulating signal load module adopts MEMS audio frequency input chip ADMP504 to realize; Described impedance adjusting module is the operational amplification circuit adopting amplifier MAX417 to form; Described bandpass filtering modules block is the bandwidth-limited circuit adopting LTC1068 to form.
Described passband adjusting module, bandlimited signal energy statistics module and control and frequency spectrum statistical module adopt MSP430F1611 microcontroller, the PWM module of MSP430F1611 microcontroller is used to realize passband adjusting module, use the ADC module of MSP430F1611 microcontroller and CPU arithmetic logic to realize bandlimited signal energy statistics module, use the CPU arithmetic logic of MSP430F1611 microcontroller and memory module to realize controlling and frequency spectrum statistical module.
Beneficial effect
Owing to have employed above-mentioned technical scheme, the present invention compared with prior art, there is following advantage and good effect: the present invention adopts the method for the analog filter Binding protein limited signal energy statistics of tunable center frequency to realize the spectrum analysis of simulating signal, evade the use of high-speed digital video camera element of high power consumption in current scheme, high cost, complicated circuit design.The present invention is applicable to the micromessage system application scenarios of low-power consumption, low cost, small size.
Accompanying drawing explanation
Fig. 1 is functional-block diagram of the present invention;
Fig. 2 is the block scheme of the specific embodiment of the invention.
Embodiment
Below in conjunction with specific embodiment, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
Embodiments of the present invention relate to a kind of simulating signal spectrum analyzer system, as shown in Figure 1, comprise simulating signal load module, bandpass filtering modules block, passband adjusting module, bandlimited signal energy statistics module, control and frequency spectrum statistical module, described simulating signal load module is for exporting the original analog input signal treating spectrum analysis; Described bandpass filtering modules block, in described passband adjusting module passband setting range, realizes the arrowband bandpass filtering treatment to original analog input signal; Described passband adjusting module, under described control and frequency spectrum statistical module control, realizes the wide region continuous setup of bandpass filtering modules block bandpass center frequency; Described bandlimited signal energy statistics module is synchronously added up for outputing signal energy to bandpass filtering modules block in the logical adjusting module adjustment process of band; Described control and frequency spectrum statistical module are by the control to passband adjusting module, realize the bandpass filtering treatment to the continuous bandpass center frequency of original analog input signal, by the synchronous statistical function of described bandlimited signal energy statistics module, complete simulating signal spectrum analysis.Also be provided with impedance adjusting module between described simulating signal load module and bandpass filtering modules block, described impedance adjusting module is for realizing the impedance matching between simulating signal load module and bandpass filtering modules block.The passband setting range covering system spectrum analysis working frequency points scope of described bandpass filtering modules block, and continuously adjustabe.The passband Adjustment precision of described bandpass filtering modules block should higher than the requirement of system spectrum analysis precision.Described bandlimited signal energy statistics module adopts Method for Accurate Calculation or guestimate method in the logical adjusting module adjustment process of band for synchronously adding up bandpass filtering modules block output signal energy.Described bandlimited signal energy statistics module, in the adjustment of passband adjusting module to bandpass filtering modules block, is added up after bandpass filtering modules block stable output.
With a specific embodiment, the present invention is further detailed below.
As shown in Figure 2, described simulating signal load module selects MEMS audio frequency to input chip ADMP504, the operational amplification circuit that described impedance adjusting module selects amplifier MAX417 to form, the bandwidth-limited circuit that described bandpass filtering modules block selects LTC1068 to form, described passband adjusting module, bandlimited signal energy statistics module and control select MSP430F1611 microcontroller with frequency spectrum statistical module, the PWM module of MSP430F1611 microcontroller is used to realize passband adjusting module function, the ADC module of MSP430F1611 microcontroller and CPU arithmetic logic is used to realize bandlimited signal energy statistics module, the CPU arithmetic logic of MSP430F1611 microcontroller and memory module is used to realize controlling and frequency spectrum statistical module.
The noise signal that the running of audio frequency input chip ADMP504 collecting device produces, output signal frequency scope is between 100Hz ~ 5kHz, and amplitude is usually between 1mV ~ 20mV, and output impedance about 200 ohm, output signal energy is less than 10uW.
The reverse amplification that amplifier MAX417 is formed and low-pass filter circuit, gain design is 50 times, and low pass is 6kHz by Frequency Design, and input impedance is designed to 20k ohm, and output impedance is designed to 10 ohm.
The band pass filter circuit that LTC1068 is formed, gain design is 2 times, center frequency point F
cadjustable extent is 100Hz ~ 5kHz, and passband width is (0.88 ~ 1.12) F
c, design clock-center frequency ratio is 200, and filter construction is the oval bandpass filter in eight rank.
The PWM module of MSP430F1611 microcontroller, exports adjustable extent and is designed to 10kHz ~ 1MHz.
The ADC module of MSP430F1611 microcontroller, applied signal voltage range set is 0 ~ 3.3V, and sampling rate is set as 20kSPS, and sampling precision is set as 12.
MSP430F1611 microcontroller energy computation module is designed to the approximate calculation method asking quadratic sum after sampling number certificate goes average, is not normalized, simplifies computation process to result of calculation.
The logical design of MSP430F1611 microprocessor controls is:
1) each module of initial configuration enters predetermined work state;
2) according to frequency sweep demand, swept frequency interval F is determined
gap=20Hz;
3) determine that spectrum scan frequency sequence is F
scan=[100,20,5000] Hz;
4) control PWM module, according to spectrum scan frequency sequence order, export corresponding clock frequency F successively
osc=200 × F
scan;
5) control ADC module, according to PWM module output clock frequency rhythm, gathers bandpass filter output signal;
6) microcontroller calculates bandlimited signal energy;
7) microcontroller records each frequency sweep point energy datum successively, forms spectrum analysis data;
In the present embodiment, adopt the LTC1068 of tunable center frequency to form analog filter, MSP430F1611 is system unique number control device, and system power dissipation is about 15mA, and operating voltage is 3.3V.The high-speed digital video camera element that the contour power consumption of FPGA, DSP, high cost, complicated circuit design is not used in system, realize practical spectrum analysis function with lower systematic cost, be applicable to the micromessage system application scenarios of low-power consumption, low cost, small size.
Claims (8)
1. a simulating signal spectrum analyzer system, comprise simulating signal load module, bandpass filtering modules block, passband adjusting module, bandlimited signal energy statistics module, control and frequency spectrum statistical module, it is characterized in that, described simulating signal load module is for exporting the original analog input signal treating spectrum analysis; Described bandpass filtering modules block, in described passband adjusting module passband setting range, realizes the arrowband bandpass filtering treatment to original analog input signal; Described passband adjusting module, under described control and frequency spectrum statistical module control, realizes the wide region continuous setup of bandpass filtering modules block bandpass center frequency; Described bandlimited signal energy statistics module is synchronously added up for outputing signal energy to bandpass filtering modules block in passband adjusting module adjustment process; Described control and frequency spectrum statistical module are by the control to passband adjusting module, realize the bandpass filtering treatment to the continuous bandpass center frequency of original analog input signal, by the synchronous statistical function of described bandlimited signal energy statistics module, complete simulating signal spectrum analysis.
2. simulating signal spectrum analyzer system according to claim 1, it is characterized in that, also be provided with impedance adjusting module between described simulating signal load module and bandpass filtering modules block, described impedance adjusting module is for realizing the impedance matching between simulating signal load module and bandpass filtering modules block.
3. simulating signal spectrum analyzer system according to claim 1, is characterized in that, the passband setting range covering system spectrum analysis working frequency points scope of described bandpass filtering modules block, and continuously adjustabe.
4. simulating signal spectrum analyzer system according to claim 1, is characterized in that, the passband Adjustment precision of described bandpass filtering modules block should higher than the requirement of system spectrum analysis precision.
5. simulating signal spectrum analyzer system according to claim 1, it is characterized in that, described bandlimited signal energy statistics module adopts Method for Accurate Calculation or guestimate method in passband adjusting module adjustment process for synchronously adding up bandpass filtering modules block output signal energy.
6. simulating signal spectrum analyzer system according to claim 1, is characterized in that, described bandlimited signal energy statistics module, in the adjustment of passband adjusting module to bandpass filtering modules block, is added up after bandpass filtering modules block stable output.
7. simulating signal spectrum analyzer system according to claim 2, is characterized in that, described simulating signal load module adopts MEMS audio frequency input chip ADMP504 to realize; Described impedance adjusting module is the operational amplification circuit adopting amplifier MAX417 to form; Described bandpass filtering modules block is the bandwidth-limited circuit adopting LTC1068 to form.
8. simulating signal spectrum analyzer system according to claim 1, it is characterized in that, described passband adjusting module, bandlimited signal energy statistics module and control and frequency spectrum statistical module adopt MSP430F1611 microcontroller, the PWM module of MSP430F1611 microcontroller is used to realize passband adjusting module, use the ADC module of MSP430F1611 microcontroller and CPU arithmetic logic to realize bandlimited signal energy statistics module, use the CPU arithmetic logic of MSP430F1611 microcontroller and memory module to realize controlling and frequency spectrum statistical module.
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| SU1246018A1 (en) * | 1981-10-02 | 1986-07-23 | Предприятие П/Я В-8117 | Frequency spectrum analyzer |
| CN1545786A (en) * | 2001-08-22 | 2004-11-10 | ADC���ͨ��ϵͳ��˾ | Monitoring upstream frequency band |
| CN1949688A (en) * | 2006-10-23 | 2007-04-18 | 华为技术有限公司 | Marker detector and detecting method |
| CN101300498A (en) * | 2005-11-04 | 2008-11-05 | 特克特朗尼克公司 | Wide-bandwidth spectrum analysis of transient signals using a real-time spectrum analyzer |
| CN102759658A (en) * | 2011-04-29 | 2012-10-31 | 特克特朗尼克公司 | Method for automatically setting frequency span in a spectrum analyzer |
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2013
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3935437A (en) * | 1974-02-25 | 1976-01-27 | Sanders Associates, Inc. | Signal processor |
| SU1246018A1 (en) * | 1981-10-02 | 1986-07-23 | Предприятие П/Я В-8117 | Frequency spectrum analyzer |
| CN1545786A (en) * | 2001-08-22 | 2004-11-10 | ADC���ͨ��ϵͳ��˾ | Monitoring upstream frequency band |
| CN101300498A (en) * | 2005-11-04 | 2008-11-05 | 特克特朗尼克公司 | Wide-bandwidth spectrum analysis of transient signals using a real-time spectrum analyzer |
| CN1949688A (en) * | 2006-10-23 | 2007-04-18 | 华为技术有限公司 | Marker detector and detecting method |
| CN102759658A (en) * | 2011-04-29 | 2012-10-31 | 特克特朗尼克公司 | Method for automatically setting frequency span in a spectrum analyzer |
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