Noise Cancellation Without reference signal

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Da Da
Da Da 2013-11-13
评论： Neil Taylor 2019-10-4
Anyone here have done the Noise Cancellation Without reference signal. Please share the Matlab code. Thank you
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Neil Taylor
Neil Taylor 2019-10-4
An old post but DD above is correct. Also look for Adaptive self-tuning filters, and self-tunning Kalman filters.

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回答（3 个）

Image Analyst
Image Analyst 2013-11-13
编辑：Image Analyst 2013-11-14
There are lots of ways to reduce noise without any reference signal. For example convolving with a box/rect filter.
smoothedSignal = conv(noisySignal, ones(1,11)/11, 'same');
Did you have some specific method in mind?
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Walter Roberson
Walter Roberson 2013-11-14
I checked Google Scholar, but I do not find any papers on the topic "Noise Cancellation Without Reference Signal" ?
Image Analyst
Image Analyst 2013-11-14
编辑：Image Analyst 2013-11-14
There is no reference signal in my code, just the noisy signal, a box filter (a rect function), and an output signal.

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Umair Nadeem
Umair Nadeem 2013-11-14
编辑：Umair Nadeem 2013-11-14
You can use a digital lowpass filter to reduce the high frequency noise peaks. Any filter would do the job but a Butterworth filter has a better response because of minimum ripples in the passband.
Sample code:
[num den] = butter(3, wn, 'low');
output = filter(num, den, input);
here take wn = signal_freq/sampling_freq, if you dont know the sampling frequency then take
wn = any value between 0.1 and 0.9 and check the response for the most suitable wn value.
Hope this helps. Your feedback will be appreciated. Thanks
jnaumann
jnaumann 2013-11-14
It sounds like you are after an Adaptive Linear Enhancer (ALE) - some info given here
http://www.mathworks.co.uk/help/dsp/examples/adaptive-line-enhancer-ale.html

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