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A method of converting analog signals into digital information

A technology of digital information and analog signals, which is applied in the field of signal processing, can solve the problems of large sampling data, high sampling rate, and large redundancy of sampling results, and achieve good cohesion and synchronization, convenient maintenance and upgrading, and improved The effect of experiment automation degree and experiment efficiency

Active Publication Date: 2016-06-15
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a method for converting analog signals into digital information in order to solve the problems of high sampling rate, large amount of sampled data, and large redundancy of sampling results in existing signal sampling methods. The method is based on LabVIEW and PXIe The analog / information conversion system is realized by

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  • A method of converting analog signals into digital information
  • A method of converting analog signals into digital information
  • A method of converting analog signals into digital information

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specific Embodiment approach 1

[0037] Specific implementation mode one: combine figure 1 , figure 2 , image 3 Describe this embodiment, the specific implementation steps of the analog / information conversion method described in this embodiment are as follows:

[0038] Step 1: configure the software and hardware parameters of the analog / information conversion system, and save the system parameters.

[0039] Step 2: Issue a start command, and the signal module under test generates a measured analog signal including multiple frequency points; the signal module under test is realized by a PXIe-5442 arbitrary waveform generator board. The amplitude of the generated measured signal is 1V, the number of frequency components contained is K=1~20, and the largest frequency component f max <5kHz.

[0040] Step 3: The measured signal is divided into multiple channels of measured signals after passing through the power divider. The first measured signal is input to the signal conditioning module, and the rest are ...

specific Embodiment approach 2

[0046] Specific embodiment two: In step five of this embodiment, the pseudo-random sequence is generated by digital-to-analog conversion; the value of each moment of the pseudo-random sequence has been calculated in advance and stored in the host computer. During the experiment, the host computer Directly output to the DAC device to generate the required pseudo-random sequence. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0047] Specific embodiment three: In step four of this embodiment, the rectangular pulse trigger signal is a rectangular pulse trigger signal with an adjustable high-level duration, which is used to eliminate the adverse effects of poor stability in the initial stage of the system, and the rise of the trigger signal The edge is used to trigger the pseudo-random sequence module to generate a pseudo-random sequence, and the falling edge of the trigger signal is used to trigger the sampling module to start sampling. Other steps are the same as in the first embodiment.

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Abstract

A method for converting analog signals into digital information belongs to the field of signal processing. The invention aims to solve the problems of high sampling rate, large amount of sampling data and large redundancy of sampling results in the existing signal sampling method. The method includes the following steps: configure and save system parameters; issue a start command, and the measured signal module generates a measured analog signal including multiple frequency points; the measured signal is divided into multiple channels of measured signals after passing through a power divider; triggering The module generates a rectangular pulse trigger signal; generates multiple different pseudo-random sequences; the signal conditioning module randomly modulates the input measured signal and pseudo-random sequence, and then inputs the randomly modulated signal to the sampling module; the sampling module captures The falling edge of the trigger signal uniformly samples the pseudo-random sequence described in step 5 and the randomly modulated signal described in step 6; and obtains spectrum information in the signal. The method of the invention is used to realize the conversion of analog signal to information.

Description

technical field [0001] The invention relates to a method for converting analog signals into digital information, which belongs to the field of signal processing. Background technique [0002] A common way to convert analog signals into digital information is to use an A / D converter. However, since the A / D device must follow the Nyquist sampling law when sampling, when the frequency of the signal is getting higher and higher, the sampling rate of the A / D device must also increase accordingly, resulting in a sharp increase in the amount of data, and at the same time The pressure on back-end data storage, transmission, and processing will also increase. In addition, the data obtained by such high-speed sampling often has large redundancy, that is, a large amount of useless data is collected. The compressed sensing theory that emerged in recent years provides a new idea for signal acquisition. The theory proves mathematically that useful information in the signal can be obtai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/12
Inventor 付宁邓立宝宋平凡乔立岩姚婷婷
Owner HARBIN INST OF TECH
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