CN114608705A - Spectral signal data sampling and peak value detection method - Google Patents

Abstract

The invention provides a spectral signal data sampling and peak value detection method, which comprises the following steps: acquiring an optical signal, generating an electrical signal by the optical signal through a detector, and acquiring a first voltage signal by the electrical signal through a pre-amplification circuit; the first voltage signal passes through an amplifying and filtering conditioning circuit to obtain a second voltage signal; performing analog-to-digital conversion on the second voltage signal through a sigma delta ADC analog-to-digital conversion module to obtain a first serial digital signal; electrically isolating the first serial digital signal to obtain a second serial digital signal; passing the second serial digital signal through the first Sinc^xFiltering by a filter to obtain first-level sampling data; calibrating zero offset error and linear error of the primary sampling data through a data calibration register to obtain secondary sampling data, monitoring an extreme value of the secondary sampling data through an extreme value register, and determining a maximum value and a minimum value corresponding to the secondary sampling data; outputting the second-level sampled data to storageThe unit performs data saving.

Description

A Spectral Signal Data Sampling and Peak Detection Method

technical field

The invention relates to the technical field of signal sampling and signal processing, in particular to a spectral signal data sampling and peak detection method.

Background technique

At present, with the development of optoelectronic technology, spectral detection technology has been greatly improved. However, there are mainly two ways of spectral detection instruments and equipment on the market: the first one, such as the invention patent CN201910704105-the fluorescence spectrum detection system based on negative feedback adjustment adopts the structure of upper computer + lower computer, the lower computer samples data, and passes the communication interface. The sampling data is sent to the upper computer, and the signal processing and data analysis are performed on the upper computer. The system circuit is complex and the cost is high. Another, as shown in the invention patent CN201810535990-a spectral detection system for gastric cancer diagnosis gastroscope, sampling through AD conversion The data is sent to the MCU, and the peak value of the signal is calculated by the MCU software filtering and software peak-finding processing. Due to the limitation of the MCU's calculation speed, after sampling a certain data, the sampling must be stopped for filtering calculation and peak-finding calculation. Real-time sampling cannot be performed, which reduces the data pass rate. .

SUMMARY OF THE INVENTION

The present invention provides a spectral signal data sampling and peak detection method to solve the problem.

A spectral signal data sampling and peak detection method, comprising:

obtaining an optical signal, passing the optical signal through a detector to generate an electrical signal Vi, and passing the electrical signal through a preamplifier circuit to obtain a first voltage signal Va;

Amplify and filter the first voltage signal Va through an amplifying, filtering and conditioning circuit to obtain a second voltage signal Vb;

Perform analog-to-digital conversion on the second voltage signal Vb through the ΣΔ ADC analog-to-digital conversion module, and obtain the converted first serial digital signal D1 on the analog side;

electrically isolating the first serial digital signal D1 through an electrical isolation circuit to obtain a second serial digital signal D2 on the digital circuit side;

Filtering the second serial digital signal D2 through the first Sinc ^x filter to obtain first-level sampling data D3;

Perform zero offset error and linear error calibration on the first-level sampling data D3 through the data calibration register, obtain the second-level sampling data D5, and perform extreme value monitoring on the second-level sampling data D5 through the extreme value register to determine the second-level sampling data. The maximum and minimum values corresponding to data D5;

The second-level sampling data D5 is output to the storage unit through the DMA controller for data storage.

As an embodiment of the present invention, the filtering of the second serial digital signal D2 through the first Sinc ^x filter to obtain the first-level sampling data D3 further includes:

Filtering the second serial digital signal D2 through the second Sinc ^x filter in the analog watchdog to obtain three-level sampling data D4;

The upper threshold and the lower threshold are set according to the third-level sampling data D4; wherein, the lower threshold corresponds to the minimum scale value of the third-level sampling data D4, and the upper threshold is set as the sampling data at the valid rising edge of the spectral signal value, monitor the third-level sampling data D4 of the spectral signal through the upper threshold;

When the three-level sampling data D4 is greater than the upper limit threshold, it is determined that a rising edge of the spectrum signal is monitored, and the analog watchdog generates a first interrupt signal.

As an embodiment of the present invention: when the three-level sampling data D4 is greater than the upper limit threshold, it is determined that the rising edge of the spectral signal is monitored, and the analog watchdog generates a first interrupt signal, further comprising:

When the analog watchdog generates the first interrupt signal, obtain the maximum value and the minimum value in the extreme value register, and clear the maximum value and the minimum value to zero;

Perform secondary extreme value monitoring on the secondary sampling data D5 through the extreme value register to determine the maximum and minimum values of the secondary extreme value monitoring;

The maximum and minimum values of the secondary monitoring are updated to the maximum and minimum values, the maximum value is set to the maximum scale value corresponding to the third-level sampling data D4, and the minimum value is set to the falling edge of the spectral signal. The sampled data value of ;

Based on the minimum value, the tertiary sampling data D4 of the spectral signal is monitored by the analog watchdog, and when it is detected that the tertiary sampling data D4 of the spectral signal is less than the lower threshold, it means that the drop of the spectral signal is monitored. edge, the analog watchdog generates a second interrupt signal.

As an embodiment of the present invention: the third-level sampling data D4 of the spectral signal is monitored by the analog watchdog based on the minimum value, and when it is detected that the third-level sampling data D4 of the spectral signal is less than the When the lower limit threshold is set, it indicates that the falling edge of the spectral signal is monitored, and the analog watchdog generates a second interrupt signal, which further includes:

When based on the second interrupt signal, read the maximum value and the minimum value of the extreme value register, and determine the peak value of the spectral signal according to the maximum value;

The lower threshold is set to the minimum scale value corresponding to the third-level sampling data D4, the upper threshold is set to the sampling data value at the rising edge of the spectral signal, and the third-level sampling data D4 of the pulse signal is monitored by the upper threshold , to determine the maximum peak value of the pulse.

Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.

The technical solutions of the present invention will be further described in detail below through the accompanying drawings and embodiments.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and are used to explain the present invention together with the embodiments of the present invention, and do not constitute a limitation to the present invention. In the attached image:

1 is a schematic diagram of a circuit structure of a spectral signal data sampling and peak detection method in an embodiment of the present invention;

2 is a schematic flowchart of a method for spectral signal data sampling and peak detection in an embodiment of the present invention;

In Figure 1, detector-1000; preamplifier circuit-2000; amplification, filter conditioning circuit-3000; ΣΔ ADC analog-to-digital conversion module-4000; electrical isolation circuit-5000; MCU-6000; DFSDM module-6100; first Sinc ^x Filter - 6110; Data Calibration Register - 6140; Extreme Value Register - 6130; Max - 6131; Min - ⁶¹³² ; DMA Controller - 6200; Filter-6121; Lower Threshold-6122; Upper Threshold 6123.

Detailed ways

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. In the absence of any such actual relationship or order, "plurality" means two or more, unless expressly specifically limited otherwise. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Example 1:

The embodiment of the present invention provides a spectral signal data sampling and peak detection method, including:

acquiring an optical signal, passing the optical signal through the detector 1000 to generate an electrical signal Vi, and passing the electrical signal through the preamplifier circuit 2000 to obtain a first voltage signal Va;

Amplify and filter the first voltage signal Va through the amplification, filtering and conditioning circuit 3000 to obtain a second voltage signal Vb;

Perform analog-to-digital conversion on the second voltage signal Vb through the ΣΔ ADC analog-to-digital conversion module 4000 to obtain the converted first serial digital signal D1 on the analog side;

The first serial digital signal D1 is electrically isolated by the electrical isolation circuit 5000 to obtain the second serial digital signal D2 on the digital circuit side;

Filtering the second serial digital signal D2 through the first Sinc ^x filter 6110 to obtain first-level sampling data D3;

The first-level sampling data D3 is calibrated for zero offset error and linearity error through the data calibration register 6140, and the second-level sampling data D5 is obtained, and the second-level sampling data D5 is subjected to extreme value monitoring through the extreme value register 6130 to determine the second level. The maximum value 6131 and the minimum value 6132 corresponding to the level sampling data D5;

The secondary sampling data D5 is output to the storage unit 6300 through the DMA controller 6200 for data preservation;

The principle of the implementation of this technical solution: In this technical solution, in the photovoltaic mode, the electrical signal generated by the detector, which has a linear relationship with the power of the optical signal, is pre-amplified, converted into a voltage signal, amplified, filtered and conditioned, and then enters the ΣΔ ADC for processing. Analog-to-digital conversion module, the converted data is sent to the DFSDM module inside the MCU through electrical isolation; the DFSDM module has functions such as hardware Sinc ^x filter, hardware analog watchdog monitoring and extreme value monitoring, and the sampled data is filtered and simulated in the DFSDM module. Watchdog monitoring, extreme value monitoring and other signals and interrupt processing, obtain the peak data of the spectral signal, monitor the rising and falling edges of the sampled data through the analog watchdog, generate interrupts on the rising and falling edges, and interrupt on the rising edge When the peak value of the signal is monitored, the peak value of the spectral signal is read when the falling edge is interrupted. During the data sampling and peak detection process, except for the analog watchdog interrupt, the interrupt service routine will occupy the MCU running time, other data filtering, extreme value detection and Data storage is realized by internal hardware of MCU;

The beneficial effects of the above technical solution are: in the interrupt service routine in this technical solution, there are only simple operations such as setting the upper and lower limit threshold registers of the watchdog, reading the extreme value registers, and processing the peak value, and the MCU occupies a very short time. Some DFSDM modules provide serial connection of external ΣΔ ADC analog-to-digital conversion modules, support SPI, Manchester protocol, support 20MHz serial data input, fast speed and convenient electrical isolation of digital and analog circuits, and Sinc ^x filter technology, There are FastSinc, Sinc ¹ , Sinc ² , Sinc ³ , Sinc ⁴ and Sinc ⁵ six filtering algorithms and 1-1024 kinds of oversampling rate, which can be different through software settings according to the type of spectral signal to be detected, signal frequency and signal bandwidth The filtering processing of the optical spectrum signal detection circuit increases the general type of the hardware of the spectral signal detection circuit, and adopts the MCU internal hardware Sinc ^x filter technology, which does not require the participation of the MCU, which is conducive to speeding up the signal processing speed, and calibrates the zero offset error and linearity in the register through the data. The error value performs real-time hardware automatic calibration on the sampled data of the pulse signal to make the sampled data more accurate.

Example 2:

In one embodiment, the filtering of the second serial digital signal D2 through the first Sinc ^x filter 6110 to obtain the first-level sampling data D3 further includes:

Filter the second serial digital signal D2 through the second Sinc ^x filter 6121 in the analog watchdog 6120 to obtain three-level sampling data D4;

The upper threshold 6123 and the lower threshold 6122 are set according to the third-level sampling data D4; wherein, the lower threshold corresponds to the minimum scale value of the third-level sampling data D4, and the upper threshold is set to the effective rising edge of the spectral signal. Sampling data values, monitoring the third-level sampling data D4 of the spectral signal through the upper threshold 6123;

When the three-level sampling data D4 is greater than the upper limit threshold 6123, it is determined that the rising edge of the spectral signal is monitored, and the analog watchdog 6120 generates a first interrupt signal;

The principle of the implementation of this technical solution: the serial digital signal is divided into two channels, one of which is filtered and calibrated respectively through the first Sinc ^x filter and the data calibration register, and the other channel enters the second Sinc ^x filter of the analog watchdog for Filtering, wherein the first Sinc ^x filter and the second Sinc ^x filter use the same type and mode, and the serial data is serial-parallel converted through the second Sinc ^x filter to generate parallel sampled data D4, using the DFSDM module. When the analog watchdog is larger than the upper threshold or smaller than the lower threshold, an interrupt is generated. Monitor the sampling data D4, set the lower threshold as the minimum scale value of the sampling data D4, and set the upper threshold as the sampling data value at the valid rising edge of the spectrum signal , the sampling data D4 of the spectral signal is monitored through the upper threshold, and the upper and lower thresholds of the analog watchdog can be calibrated during program setting through the data in the data calibration register. At this time, the upper and lower thresholds can be used for the secondary sampling data. D5 to monitor;

The beneficial effects of the above technical solution are: in the technical solution, when the serial digital signal is transmitted, two kinds of Sinc ^x filters are used for filtering, and the second Sinc ^x filter inside the analog watchdog can quickly monitor data and generate interruptions. , and Sinc ^x filter technology, there are FastSinc, Sinc ¹ , Sinc ² , Sinc ³ , Sinc ⁴ and Sinc ⁵ six filtering algorithms and 1-1024 oversampling rates, which can be detected according to the type of spectral signal to be detected, signal frequency and Signal bandwidth, different filtering processing is performed through software settings, which increases the versatility of the spectral signal detection circuit hardware and can reduce noise interference. By setting the upper and lower thresholds to monitor the secondary sampling data D4, it is beneficial to obtain the spectral signal from the rising The maximum value of the three-level sampling data D5 between the edge and the falling edge is used to determine the peak value of the spectral signal.

Example 3:

In one embodiment, when the three-level sampling data D4 is greater than the upper limit threshold 6123, it is determined that a rising edge of the spectrum signal is detected, and the analog watchdog 6120 generates a first interrupt signal, further comprising:

When the analog watchdog 6120 generates the first interrupt signal, obtains the maximum value 6131 and the minimum value 6132 in the extreme value register 6130, and clears the maximum value and the minimum value;

Perform secondary extreme value monitoring on the secondary sampling data D5 through the extreme value register 6130 to determine the maximum and minimum values of the secondary extreme value monitoring;

Update the maximum value and minimum value of the secondary monitoring to the maximum value 6131 and the minimum value 6132, set the maximum value to the maximum scale value corresponding to the third-level sampling data D4, and set the minimum value to the spectral signal drop the sampled data value at the edge;

Based on the minimum value, the third-level sampling data D4 of the spectral signal is monitored by the analog watchdog 6120. When the monitored third-level sampling data D4 of the spectral signal is less than the lower threshold 6122, it means that the spectral signal is monitored. , the analog watchdog 6120 generates a second interrupt signal;

The principle of the implementation of this technical solution: In this technical solution, the rising edge and falling edge of the sampled data are monitored by an analog watchdog, an interrupt is generated at the rising edge and the falling edge, and the peak value of the signal is monitored when the rising edge is interrupted, and the falling edge is interrupted. When reading the peak value of the spectral signal, in the data sampling and peak detection process, except for the analog watchdog interrupt, the interrupt service routine will occupy the MCU running time. Other data filtering, extreme value detection and data storage are implemented by the internal hardware of the MCU;

The beneficial effects of the above technical solution are: in the technical solution, the resolution of sampling can be improved by adopting the hardware oversampling technology, and the internal analog watchdog of the DFSDM module is used to replace the external comparison trigger circuit, which is conducive to saving costs and improving circuit operation efficiency. The maximum and minimum values of the sampled data are monitored in real time through the internal extreme value register, without the need for MCU software intervention, and the hardware realizes the peak-finding calculation, which improves the peak detection capability of the pulse signal.

Example 4:

In one embodiment, based on the minimum value, the analog watchdog 6120 monitors the third-level sampling data D4 of the spectral signal, and when it is detected that the third-level sampling data D4 of the spectral signal is less than the lower threshold At 6122, it indicates that the falling edge of the spectrum signal is monitored, and the analog watchdog 6120 generates a second interrupt signal, which further includes:

When based on the second interrupt signal, read the maximum value and the minimum value of the extreme value register 6130, and determine the peak value of the spectral signal according to the maximum value;

The lower threshold 6122 is set to the minimum scale value corresponding to the three-level sampling data D4, the upper threshold 6123 is set to the sampling data value at the rising edge of the spectral signal, and the three-level pulse signal is monitored by the upper threshold 6123 Sampling data D4 to determine the maximum peak value of the pulse;

The principle of the implementation of this technical solution: In this technical solution, the interrupt signal received by the interrupt service program is used to read the maximum and minimum values of the extreme value register. The maximum value is the time between the rising edge and the falling edge of the spectral signal. The maximum value of the sampled data, that is, the peak value of the detected spectral signal, the interrupt service routine sets the lower threshold as the minimum scale value of the third-level sampling data D4, and the upper threshold is used to monitor the third-level sampling data D4 of the pulse signal, and Repeat the above steps to realize sampling processing of each pulse signal, and realize real-time detection of the maximum peak value of the pulse;

The beneficial effects of the above technical solution are as follows: in this technical solution, the maximum and minimum values of the sampled data are monitored in real time by using the extreme value register inside the DFSDM module, no MCU software intervention is required, and the hardware realizes the peak-finding calculation, which improves the peak detection capability of the pulse signal. And speed up the signal processing speed, and replace the external comparison trigger circuit by the analog watchdog, which is beneficial to save the cost and improve the operation efficiency of the circuit.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media having computer-usable program code embodied therein, including but not limited to disk storage, optical storage, and the like.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block in the flowcharts and/or block diagrams, and combinations of flows and/or blocks in the flowcharts and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in one or more of the flowcharts and/or one or more blocks of the block diagrams.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions An apparatus implements the functions specified in a flow or flows of the flowcharts and/or a block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in one or more of the flowcharts and/or one or more blocks of the block diagrams.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (4)

1. A method of spectral signal data sampling and peak detection, comprising:

acquiring an optical signal, enabling the optical signal to generate an electric signal Vi through a detector (1000), and enabling the electric signal to pass through a pre-amplification circuit (2000) to acquire a first voltage signal Va;

amplifying and filtering the first voltage signal Va through an amplifying and filtering conditioning circuit (3000) to obtain a second voltage signal Vb;

performing analog-to-digital conversion on the second voltage signal Vb through a sigma delta ADC analog-to-digital conversion module (4000) to obtain a first serial digital signal D1 at the analog side after conversion;

electrically isolating the first serial digital signal D1 through an electrical isolation circuit (5000) to obtain a second serial digital signal D2 on the digital circuit side;

passing the second serial digital signal D2 through a first Sinc^xFiltering by a filter (6110) to obtain first-stage sampling data D3;

calibrating zero offset error and linear error of the primary sampling data D3 through a data calibration register (6140) to obtain secondary sampling data D5, monitoring extremum of the secondary sampling data D5 through an extremum register (6130), and determining a maximum value (6131) and a minimum value (6132) corresponding to the secondary sampling data D5;

and outputting the two-level sampling data D5 to a storage unit (6300) through a DMA controller (6200) for data saving.

2. A method of spectral signal data sampling and peak detection as claimed in claim 1, wherein said passing said second serial digital signal D2 through a first Sinc^xThe filter (6110) performs filtering to obtain first-stage sample data D3, and further includes:

passing the second serial digital signal D2 through a second Sinc in an analog watchdog (6120)^xFiltering by a filter (6121) to obtain three-level sampling data D4;

setting an upper limit threshold (6123) and a lower limit threshold (6122) according to the three-level sampling data D4; wherein the lower threshold corresponds to the minimum scale value of the three-level sampling data D4, the upper threshold is set as the sampling data value at the effective rising edge of the spectrum signal, and the three-level sampling data D4 of the spectrum signal is monitored through the upper threshold (6123);

when the three-level sampling data D4 is greater than the upper limit threshold (6123), determining that the rising edge of the spectrum signal is monitored, and generating a first interrupt signal by the analog watchdog (6120).

3. A method for sampling and peak detection of spectral signal data according to claim 2, wherein said determining that a rising edge of a spectral signal is monitored when said tertiary sampled data D4 is greater than said upper threshold value (6123), said analog watchdog (6120) generating a first interrupt signal, further comprises:

when the simulation watchdog (6120) generates the first interrupt signal, acquiring a maximum value (6131) and a minimum value (6132) in an extremum register (6130), and performing zero clearing processing on the maximum value and the minimum value;

carrying out secondary extremum monitoring on the secondary sampling data D5 through an extremum register (6130) to determine the maximum value and the minimum value of the secondary extremum monitoring;

updating the maximum value and the minimum value of the secondary monitoring to a maximum value (6131) and a minimum value (6132), setting the maximum value to be a maximum scale value corresponding to the three-level sampling data D4, and setting the minimum value to be a sampling data value at the falling edge of the spectrum signal;

and monitoring the three-level sampling data D4 of the spectral signal through the simulated watchdog (6120) based on the minimum value, indicating that the falling edge of the monitored spectral signal is detected when the three-level sampling data D4 of the monitored spectral signal is smaller than the lower limit threshold (6122), and generating a second interrupt signal by the simulated watchdog (6120).

4. A method for sampling and peak detection of spectral signal data according to claim 3, wherein said monitoring the three-level sampled data D4 of the spectral signal by said simulated watchdog (6120) based on said minimum value, when the three-level sampled data D4 of the spectral signal is monitored to be less than said lower threshold (6122), indicating that the spectral signal is monitored to have a falling edge, said simulated watchdog (6120) generating a second interrupt signal, further comprising:

reading the maximum value and the minimum value of the extremum register (6130) based on the second interrupt signal, and determining the peak value of the spectrum signal according to the maximum value;

and setting the lower threshold (6122) as a minimum scale value corresponding to the three-level sampling data D4, setting the upper threshold (6123) as a sampling data value at the rising edge of the spectrum signal, monitoring the three-level sampling data D4 of the pulse signal through the upper threshold (6123), and determining the maximum peak value of the pulse.

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