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Frequency conversion sampling method

A frequency conversion sampling and point sampling technology, applied in the direction of analog-to-digital converters, etc., can solve the problems of unstable A/D conversion, sampling data errors, and impossible data recovery.

Inactive Publication Date: 2012-06-20
ZHONGBEI UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The above-mentioned frequency conversion sampling method that changes the sampling frequency according to the signal characteristics has its limitations. ①It uses variable interval time to sample the analog signal, essentially sampling the signal at the source of the signal, so that it is impossible to completely restore the data of
②When the trigger signal for changing the sampling frequency is valid, that is, when the sampling frequency is changed, the A / D conversion needs to set up time. The A / D conversion at this moment is unstable, and even the sampling data may be wrong.

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Examples

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Embodiment 1

[0024] Embodiment 1. Frequency conversion sampling method

[0025] The specific situation of the frequency conversion sampling method in this example is given by Figure 1 to Figure 5 As shown jointly, the technical feature of this frequency conversion sampling method is that the frequency conversion sampling method selects and changes the memory push address frequency according to the characteristic change of the sampled signal to realize the method of frequency conversion sampling, that is, the frequency conversion sampling method is in a test process Among them, the analog signal is sampled at equal intervals, and the digital signal obtained through A / D conversion is read, written and stored in the first memory or the register memory. When reading, writing and storing, it is divided into several sub-processes according to the characteristic changes of the sampled signal and According to each sub-process, the frequency of changing the memory advance address is adopted, and t...

Embodiment 2

[0026] Embodiment 2. Frequency conversion sampling method

[0027] The frequency conversion sampling method of this example can be used in specific circumstances Figure 1 to Figure 5 etc. jointly show that the frequency conversion sampling method of this example is different from the frequency conversion sampling method of embodiment one: 1. This example is a digital signal processor DSP such as the control module 8 of a set of electronic circuit devices that this example adopts for realizing the frequency conversion sampling method. 2. A complex change process of the sampled signal in this example is divided into n sub-processes and adopts corresponding different memory advance address frequency sampling according to each sub-process, and the corresponding different sampling frequencies may be i, and n=i in this example illustrates The sampling frequency of each sub-process is different. The rest of the variable frequency sampling method in this example is the same as that ...

Embodiment 3

[0028] Embodiment 3. Frequency conversion sampling method

[0029] The frequency conversion sampling method of this example can be used in specific circumstances Figure 1 to Figure 5 etc. jointly show that the frequency conversion sampling method of this example is different from the frequency conversion sampling method of embodiment one and embodiment two: 1. this example is to realize that the control module 8 of a set of electronic circuit devices that the frequency conversion sampling method adopts is programmable logic devices, etc. 2. In this example, a complex change process of the sampled signal is divided into n sub-processes, and different memory advance address frequency sampling is used for each sub-process. There may be i different corresponding sampling frequencies. If n>i, there are The sampling frequency of the sub-processes is the same. The rest of the frequency conversion sampling method in this example is the same as that described in Embodiment 1 and Emb...

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Abstract

The invention discloses a frequency conversion sampling method and belongs to the technical field of electronic test and signal acquisition. The method comprises the following steps of: in a test process, performing point extraction sampling on an analog signal at equal intervals by using a selected frequency f0; performing analog / digital (A / D) conversion to obtain a digital signal, and reading, writing and storing the digital into a first memory; and during reading, writing and storing of the digital signal, dividing the test process into 1, 2, ..., and n sub-processes according to the frequency characteristic change of the sampled signal, performing point extraction sampling on data which are read, written and stored in the first memory by using changed frequencies f1, f2, ..., and fi of the promotion address of the memory according to each sub-process, and storing the data into a second memory to obtain frequency conversion sampling data between the n sub-processes of the test process to realize frequency conversion sampling, wherein n is not less than i. The frequency conversion sampling method has the advantages that: the defects of the conventional frequency conversion sampling method are overcome; the frequency conversion sampling data can be completely recovered; a whole set of electronic circuit device is designed and researched; by adoption of the device, the frequency conversion sampling method can be implemented; and the frequency conversion sampling method can be applied and popularized.

Description

1. Technical field [0001] The frequency conversion sampling method disclosed by the invention belongs to the technical field of electronic testing and signal acquisition, and specifically relates to a method for changing the push address frequency to realize frequency conversion sampling according to the characteristic change of the measured signal. 2. Background technology [0002] The sampling frequency determines the quality and quantity of the sampled signal. If the sampling frequency is too high, the number of acquired signals will increase sharply, occupying a large number of storage units; if the sampling frequency is too low, some information of the analog signal will be lost, so if the sampled signal is restored to the original signal, the Distortion occurs. Therefore, in order to achieve the best results, an appropriate sampling frequency must be selected according to the characteristics of the signal. [0003] According to the Nyquist sampling theorem, for the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
Inventor 靳鸿王燕祖静马铁华陈昌鑫付永乐裴东兴沈大伟张红艳
Owner ZHONGBEI UNIV