warning Data clipped during write to file

Question

Judyta 2012-12-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/55652-warning-data-clipped-during-write-to-file

评论： Mohamed 2024-9-10

Im trying to create .wav file

s3 = (s2-min(s2))./(max(s2)-min(s2)).*2-1;
wavwrite(s3, 1250, 16, 'signal.wav');

and I got those warnings:

Warning: Data clipped during write to file:2012-11-23_13-08-18p.wav 
> In wavwrite>PCM_Quantize at 285
  In wavwrite>write_wavedat at 301
  In wavwrite at 138

Does anybody knows how to solve it?

I fougth that clipped during write means that my data are not in the range of -1 and 1?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2012-12-4

3
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/55652-warning-data-clipped-during-write-to-file#answer_67502

-1 exactly is allowed in the data, but +1 exactly is not allowed.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

fatima zahra manzah 2021-4-7

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/55652-warning-data-clipped-during-write-to-file#answer_669242

在 MATLAB Online 中打开

I put this to save the 2 songs

f=44100
audiowrite("singingChurch.wav",singingChurch,f)
audiowrite("singingDungeon1.wav",singingDungeon,f)

i got this :

Warning: Data clipped when writing file.

How can i deal with this please

5 个评论
显示 3更早的评论隐藏 3更早的评论

Walter Roberson 2021-8-7

If you are using a newer version of MATLAB, see rescale(); otherwise see mat2gray() .

However, you should be careful about whether you map minimum your data has, to -1, and the maximum to +1, or if you should instead map fixed values to -1 and +1. If you map according to the minimum and maximum present in your data, then you cannot use the result for absolute comparisons.

For example suppose that you were implementing a simple echo. If you had a loud enough original data happening at the time that a loud portion of earlier data was being mixed in, then you could exceed 1.0, and you might consider rescaling according to what is present in the data. For example the input data range might be [-1/2 1/2] and the echo data range might be [-3/4 5/4] and mapping might then be multiplying by 4/5, giving [-3/4 5/4] * 4/5 --> [-3/5 1] as the new data range.

Now suppose you take the same input data range [-1/2 1/2] and apply no echo -- so the output of the echo stage should be exactly the same as the input. Does it make logical sense that the unaltered input needs to be mapped (in which case you would double it to get [-1 1] in this situation)? Or does it make logical sense that instead in such a situation the output should be the same as the input? Remembering that the input expresses relative volumes: does it make sense that a light flute that receives no echo (perhaps the echo was longer than the piece; perhaps the angle was wrong relative to the surroundings) should suddenly become a much louder flute?

Also, watch out: that case of [-3/4 5/4], rescale() and mat2gray() would by default end up processing by subtracting 1/4, getting [-4/4 4/4] rather than scaling by 4/5: you need to decide which approach is right for your purposes.

Shan Shaffi 2021-8-9

Sorry for the late reply. I just read your answer. Thank you for taking the time to answer in detail. This was very helpful. I will try with rescale()

Mohamed 2024-9-10

super hetrodyne reciever, fatima?

请先登录，再进行评论。

Answer 3

Jan 2012-12-5

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/55652-warning-data-clipped-during-write-to-file#answer_67564

在 MATLAB Online 中打开

The documentation explains: For 16 bit precision, the values are limited to –1.0 <= y < +1.0, when the signal is provided as floating point format. A workaround is to convert the data manually before calling wavwrite():

yInt = y * 32768;
yInt(yInt == 32768) = 32767;

5 个评论
显示 3更早的评论隐藏 3更早的评论

Rashika Raina 2021-6-17

how to normalize to [-1,1) ?

Walter Roberson 2021-6-18

编辑：Walter Roberson 2021-6-18

I woud recomment using audiowrite(), which does permit +1 exactly.

请先登录，再进行评论。

Answer 4

Judyta 2012-12-5

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/55652-warning-data-clipped-during-write-to-file#answer_67583

Thank You for your answers, i wanted to ask one more thing, When this warning about clipping occurs, what really happends with those samples equal to 1? are reduced or avoided?

and Jan Simon, thank You for Your answer but i don't understand what this code does. May I please ask you to explain me?

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Daniel Shub 2012-12-5

They are "reduced" by clipping them to the maximum/minimum allowed value. A difference between 1 and 1-2^15 is probably not anything to worry about.

请先登录，再进行评论。

warning Data clipped during write to file

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

回答（4 个）

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

5 个评论
显示 3更早的评论隐藏 3更早的评论

5 个评论
显示 3更早的评论隐藏 3更早的评论

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

另请参阅

类别

标签

Community Treasure Hunt

warning Data clipped during write to file

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

回答（4 个）

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

5 个评论 显示 3更早的评论隐藏 3更早的评论

5 个评论 显示 3更早的评论隐藏 3更早的评论

1 个评论 显示 -1更早的评论隐藏 -1更早的评论

另请参阅

类别

标签

Community Treasure Hunt

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

5 个评论
显示 3更早的评论隐藏 3更早的评论

5 个评论
显示 3更早的评论隐藏 3更早的评论

1 个评论
显示 -1更早的评论隐藏 -1更早的评论