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The OP

Published on 2021-4-16 17:51 Only look at the author

Interpretation of FFT data of IPC communication of TL5708 development board [Copy link]

# Interpretation of FFT data of IPC communication of TL5708 development board **Table of Contents** [TOC] ## 1. The actual set waveform parameters The signal input to the DSP core is as follows: Initialize the time domain data. Here, a superimposed sine waveform of 50Hz, 100Hz, 200Hz, and 500Hz is set. ```c float *dataIn = (float*)msg->dataIn; for(j = 0; j < PAYLOADSIZE; j++) { dataIn[j] = sin (2 * 3.1415 * 50 * j / (double) PAYLOADSIZE)+sin (2 * 3.1415 * 100 * j / (double) PAYLOADSIZE)+sin (2 * 3.1415 * 200 * j / (double) PAYLOADSIZE)+sin (2 * 3.1415 * 500 * j / (double) PAYLOADSIZE); } ``` So when converting from time domain to frequency domain, it should be valuable at 50Hz, 100Hz, 200Hz, and 500Hz. ## 2. FFT data acquisition and processing In DSP, the FFT operation algorithm is as follows: 
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<img style="cursor:pointer;" id="aimg_533626" aid="533626" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202104/16/172030cxyyytvpwhdycymx.jpg" file="//bbs.eeworld.com.cn/data/attachment/forum/202104/16/172030cxyyytvpwhdycymx.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" />

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<p><strong>1.jpg</strong> <em class="xg1">(126.83 KB, downloads: 0)</em></p>
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<p class="xg1 y">2021-4-16 17:20 上传</p>

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<img style="cursor:pointer;" id="aimg_533627" aid="533627" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202104/16/172039x6y5gtdd816tz78p.jpg" file="//bbs.eeworld.com.cn/data/attachment/forum/202104/16/172039x6y5gtdd816tz78p.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" />

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<p class="xg1 y">2021-4-16 17:20 上传</p>

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 The data obtained after the program is run is stored as a txt file: 
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<img src="/bbs/static/image/filetype/unknown.gif" border="0" class="vm" alt="" />
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<a href="javascript:;" class="loginf">FFTData_20210415</a>

<em class="xg1">(1.13 MB, downloads: 0)</em>
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<div class="y">2021-4-16 17:11 上传</div>
点击文件名下载附件

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 Next, open the MATLAB software and start data processing on the FFTData_20210415 text file. Explanation: I saved the text file on the desktop of the computer. Let's design a simple MATLAB program to read the data in the text document: ```c TXT = textread('C:\Users\bqgup\Desktop\FFTData_20210415');%%Read TXT Length = length(TXT);%%Calculate length m = 1:1:Length; %%Plot points plot(m,TXT) %%Draw a graph``` 
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<img style="cursor:pointer;" id="aimg_533632" aid="533632" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202104/16/173301pauwxh2g5ae258ex.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202104/16/173301pauwxh2g5ae258ex.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" />

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<p class="xg1 y">2021-4-16 17:33 上传</p>

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 The spectrum diagram is as follows: 
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<img style="cursor:pointer;" id="aimg_533633" aid="533633" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202104/16/173541sg4h9gaz0e04ck6e.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202104/16/173541sg4h9gaz0e04ck6e.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" />

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<p class="xg1 y">2021-4-16 17:35 上传</p>

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 It can be seen from the above figure that the generated spectrum diagram is not very clear. Let's zoom in on the local image: 
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<img style="cursor:pointer;" id="aimg_533637" aid="533637" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202104/16/175046dolv6rzz4d5rmo49.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202104/16/175046dolv6rzz4d5rmo49.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" />

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It seems that the FFT calculation algorithm of IPC communication is still worth studying. Details Published on 2021-4-17 08:55

693 Posts	7 Resources

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The OP| Published on 2021-4-30 20:35 Only look at the author

(ii) Interpretation of the time domain data of the IPC communication of the TL5708 development board: Today I rewrote a program to store the time domain data and do some simple processing on the time domain data.

The time domain file is as follows : TData_20210430 (1.19 MB, downloads: 0)

Using MATLAB to simulate the time domain file, we can get:

The frequency domain waveform is obtained by performing FFT operation on the time domain data through MATLAB:

Conclusion: The waveform drawn by FFT frequency domain data is the same!!!

This post is from Innovation Lab

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Published on 2021-4-17 08:55 Only look at the author

It seems that the FFT calculation algorithm of IPC communication is still worth studying.

This post is from Innovation Lab

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The DSP core comes with various complex algorithms such as FFT. You just need to pass in the correct data and open up the appropriate memory. Details Published on 2021-4-19 19:41

693 Posts	7 Resources

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The OP| Published on 2021-4-19 19:41 来自手机 Only look at the author

Jacktang published on 2021-4-17 08:55 It seems that the FFT calculation algorithm of IPC communication is still worth studying

The DSP core comes with various complex algorithms such as FFT. You just need to pass in the correct data and open up the appropriate memory.

This post is from Innovation Lab

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