Questions tagged [noise-cancellation]

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Is it possible to design a wearable device with a noise reduction ratio (NRR) larger than 36 dB?

Wearing both ear muffs (whether passive or active) and earplugs simultaneously can't yield more than 36 dB noise reduction ratio (NRR), because: it does not prevent the sound to reach your inner ear ...
Franck Dernoncourt's user avatar
5 votes
1 answer
108 views

Removing a noise pulse from a signal

I have a sampled audio signal that is corrupted with a noise pulse that occurs at regular intervals. The pulse is in the form of several periods of a sine wave, and I believe the frequency of that ...
gschro's user avatar
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2 answers
47 views

Estimating acoustic sound signal energy radiated

Im recording sound generated by a drilling machine against an object. I have the recording of following : Ambient noise with drilling machine switched off. Drilling machine on+ambient noise Drilling ...
V.M Sypher's user avatar
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0 answers
35 views

Tracking period of quasi-periodic transient type signal in strong non-stationary interference

Consider a desired (pink) signal as well as its observation in heavy, non-stationary interference (green, this is the desired signal plus interference). As seen in the plot, the interference can also ...
rhz's user avatar
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0 answers
44 views

Audio Classification

Most of the paper about audio classification has worked like this they have specific sounds class wise and the did classification. What if the audio files i have collected have two different sounds at ...
Mudassir Ahmad's user avatar
4 votes
1 answer
153 views

Fractionally spaced equalizer using LMS algorithm

I am doing a project about the fractionally spaced equalizers on matlab. The goal is to mitigate ISI on the signal using the LMS algorithm to update the tap weights of the FSE. Below i have uploaded ...
Obsidian's user avatar
0 votes
1 answer
57 views

What is limited this FXLMS performance

This is simulation data flow: ...
mohammadsdtmnd's user avatar
1 vote
0 answers
43 views

Filter choice for the signal with the possible time jitter in sampling and frequency aliasing

I'm trying to filter data from the force sensor mounted on the end effector of the industrial robot arm. Mechanical vibration caused by the robot's motion (possibly by actuators, reductors, etc.) ...
Viktor Sokolov's user avatar
3 votes
2 answers
644 views

How do noise-canceling headphones cancel out white noise, which is unpredictable in nature?

From what I know noise-canceling headphones generate sound waves that are 180° out of phase with the ambient noise. I understand that they are not effective at canceling out sudden and unpredictable ...
mdatsev's user avatar
  • 131
1 vote
1 answer
2k views

Detecting and Removing Noise from Signal using Python

Through this platform, I want to ask that how can I remove unwanted noise from the signal when you do not have much information regarding the frequency at which they appear? Data is collected from an ...
Aisha Nasir's user avatar
0 votes
0 answers
96 views

Remove additive-zero-mean-Gaussian noise

I have 5 values, and each value is corrupted by Additive-Zero-Mean-Gaussian Noise with variance = 0.05. Each value is in the range from 0 to 1. Is there anyway for me to remove the noise?
wrek's user avatar
  • 101
5 votes
2 answers
1k views

Remove single echo from audio signal

I have an audio recording where something went wrong and a copy of the audio was added with a few milliseconds delay. What technique can I use to remove that echo? Here's a short snippet to explain: ...
Andreas Jansson's user avatar
0 votes
4 answers
89 views

How long can information be preserved with modern technology?

This might not be quite the right forum, but with access to "consumer grade" memory storage and modern error correction algorithms, how long (order of magnitude) can data be preserved before ...
user2647513's user avatar
2 votes
1 answer
293 views

Noise Reduction - noisy lines

I'm trying to reduce the noise in this photo. What type of filters/techniques should I use to cancel out the noise? I've tried using box filter and Gaussian filter to blur out some of the noise, but i ...
adimath's user avatar
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3 votes
0 answers
123 views

Pop and buzz noises caused by the signal process

There is a measurement called waterfall effect in audio systems. When you apply a sweep signal starting from 50Hz to 20KHz, it shows how long the resonance of the speaker goes. For example in the ...
Alper91's user avatar
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0 votes
1 answer
223 views

Allan variance and the bias

I was reading about the Allan-variance method and I have a question and I need some help to understand it. Since the Allan is about analyzing the frequency stability and it can characterize the IMU ...
jon's user avatar
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1 vote
0 answers
97 views

How to optimize noise reduction to perform burst detection and detect oscillations?

Let be $\mu_k$ some univariate signals of time $t$. I am performing burst detection to detect oscillations in any signal $\mu_k$. I tested the following methods : Perform noise reduction on $\mu_k$ ...
Mistapopo's user avatar
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1 vote
0 answers
895 views

Getting envelope of noisy signal

I am analyzing some interferometry data and have a time signal that looks like this: Our temporal resolution is unfortunately not enough to resolve the fringes. I need to get the upper envelope of ...
Regulus's user avatar
  • 11
0 votes
1 answer
45 views

What is the way in which an audio signal is "cleaned"?

I was studying how signals can be "decompose" with the Frequency domain analysis and Fourier transforms; I have also read that through these actions it is possible to clean the signals from ...
Omar Lugiai's user avatar
0 votes
1 answer
296 views

Removing very big peaks in a signal

I am analyzing a signal where I want to extract the peaks based on a threshold. My problem here is that there are some noise artifacts very high that are messing with my signal. I want to remove them ...
GGChe's user avatar
  • 153
2 votes
1 answer
109 views

Could alternative SNR definition be converted into dB unit?

There is alternative definition for SNR that mention in Signal-to-noise ratio It is: $$SNR = \frac{\mu}{\sigma}$$ i.e. mean per standard deviation, Is it possible to convert this SNR value into dB ...
Dziban N's user avatar
0 votes
0 answers
56 views

What is the best approach to cancel realtime noise from a participant audio for conference purpose?

I am new to audio signal processing and I wanna do real-time noise cancelation for a participant in a conference. I am capturing audio at 16bit, 16khz, little-endian config. I tried to use the webRTC ...
Nafiul Alam Fuji's user avatar
1 vote
0 answers
131 views

How to remove noise from the signal? [closed]

I'm new to DSP and currently working on time-series data. The mentioned time series (of Toe) is extracted from a video tracking various body parts of an athlete. Ideally, there shouldn't be any ...
Bhaskar Dhariyal's user avatar
1 vote
1 answer
108 views

Can you use Active Noise Cancellation to cancel the noise emitted by a device in a room?

Let's say we have a device placed in a 5m x 7m room. The device dimensions are 50cm x 50cm x 10cm. The device has an internal fan which is producing acoustic noise. The device also has an internal ...
james3849's user avatar
  • 329
1 vote
2 answers
528 views

What kind of noise features should I know before removing them programmatically?

This is my first question here in DSP StackExchange and honestly speaking I don't have any experience in this field, but one of the school project I'm currently working in is building an application ...
Bach Le Duy's user avatar
-1 votes
1 answer
120 views

Why do we use Multichannel AEC when tweaking the tap length of Simple AEC can cancellation multiple echoes?

We are working on Acoustic Echo Cancellation. For that we have performed different experiments and we got to the conclusion that if we are getting multiple echoes in the Near-end signal, we can cancel ...
Aneela Jaffer's user avatar
0 votes
1 answer
68 views

Classification of very noisy EMG signals

I'm an absolutely newbie to signal processing. I'm trying to classify EMG signals which are very noisy (decibel values are more than -70 dB in some cases). After applying EMD technique these values ...
Debbie's user avatar
  • 145
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0 answers
115 views

How to seperate two signals?

I am new to DSP. My current project entails using DSP to analyse some datasets derived from experimental data. This data can be split into three: Signal A, which measures response from input X. ...
user58033's user avatar
0 votes
1 answer
386 views

How does upsampling/interpolation/oversampling help with noise shaping?

That's all, Why does upsampling improve the resolution and signal-to-noise ratio? What makes it so good for noise-shaping
Nyquist-er's user avatar
1 vote
1 answer
298 views

Can simple FIR/IIR filtering recover/estimate a signal plagued with low SNR white noise?

I'm trying to design a filter to restore the original signal from strong noise (low SNR). I have tried low pass FIR and it could work well as the amplitude of original signal is much higher than the ...
marcus zhang's user avatar
1 vote
0 answers
490 views

Eliminating drift generated from double integration of acceleration signal using Envelope Method

I'm trying to remove the drift generated upon the double integration of a noisy acceleration signal. But this question discusses only removing the drift upon single integration to generate velocity ...
MajorMajorMajorMajor's user avatar
0 votes
0 answers
39 views

Click sounds stop spectral subtraction

I'm using a spectral subtractor to eliminate some continuous tones equi spaced in frequency through overlap-add method, some example code in Matlab: ...
Lanas's user avatar
  • 1
0 votes
1 answer
436 views

Removing white noise by taking the mean of many samples

I'm learning about signal processing, and I am attempting to remove white noise from an output of a blackbox system. As you can see from the above image (left is the input sin(t), right is the output)...
Thetafinity's user avatar
1 vote
1 answer
201 views

What is causing my ANC LMS update to diverge?

I'm trying to implement a simulation of an ANC system with python, using this model here. My simulation keeps diverging, and I honestly don't know why. I'm using a source for LMS adaptive filter from ...
Vincent Lu's user avatar
0 votes
1 answer
49 views

What is the input dimension for LMS update algorithm

I just realized this forum existed, posted my question on the wrong forum. Sorry about the formatting, please don't hesitate to ask if any part of this post is unclear. This is my first post. I'm ...
Vincent Lu's user avatar
4 votes
2 answers
346 views

Is it possible to remove the non-random noise in the signal by averaging?

Ex: We're measuring vibration Frequency response of a structure, and at the same time there is a constant source of vibration (noise) from a pump. The pump is exciting the structure by sinusoid ...
AJ3's user avatar
  • 41
6 votes
2 answers
1k views

What is the advantage of Wiener filter for noise reduction of a 1D signal?

I have a 1D signal, acquired by an accelerator sensor that measure the vibration of a structure. What is the advantage of using a Wiener filter for noise reduction compared to the other (more classic) ...
EmThorns's user avatar
  • 393
2 votes
1 answer
649 views

Why removing noise increases my audio file size?

I took some mp3 files of people talk with noise in the background and then removed the background noise using online voice seperator tools (such as https://vocalremover.org/). I was surprised to find ...
Amit Keinan's user avatar
0 votes
0 answers
90 views

Remove noise from distance calculated from accelerometer data

I got distance calculated from accelerometer raw datas using double integral accelerometer.I attached the image below.But it shows noise with it.Please help me to remove this noise.
Rahul Chandran's user avatar
0 votes
1 answer
894 views

Cochleagram vs STFT for CNN-based speech segregation

I’m working on a project (python-based) that would use ideal ratio masks (IRMs) as a basis for cleaning noisy speech in various environments. Specifically, this will be accomplished through the use of ...
Jennifer Jacobs's user avatar
1 vote
0 answers
37 views

Finding the noise only part in a signal [duplicate]

I have signal which contains some noise only regions (glitch with the recording it seems). The question is: I would like to identify the discrete time samples where this noise part starts and ends. ...
Dsp guy sam's user avatar
  • 2,610
1 vote
2 answers
54 views

ICA for Noise Reduction over a Dataset

Suppose my dataset consists of $N$ example vectors $\mathbf{x}_{1}, \ldots, \mathbf{x}_{N}$ where $\mathbf{x}_{n} \in \mathbb{R}^{p}$ $\forall n$. I assume that each vector $\mathbf{x}_{n}$ is ...
The Dude's user avatar
  • 632
1 vote
2 answers
191 views

How can I filter a noise with pattern type in audio?

I have a set of audio files rescued from a source of phonograph record like a gramophone. Very old family stuff records from my elders back in year 1946. A relative has digitalized these with a ...
Leandro Alsina's user avatar
0 votes
0 answers
215 views

How to cancel this noise to find numbers of DTMF tones?

Touch-tone telephones use a dual tone multi frequency (DTMF) scheme to encode key-presses as audio tones: I have a signal containing 10 number tones. I used frequency response to show what ...
An Vo Le's user avatar
1 vote
2 answers
178 views

Removing Noise from time across signal data

I am new to the field of signal processing. I have sensor data (Impedance across time), that output is like this. On the right side, I have a noisy signal portion in my data, marked by the red block....
Ati's user avatar
  • 13
0 votes
0 answers
38 views

Capture the ambient sound

I sit in a cafe and start recording my voice, reading a poem. Then I sit at my room, at complete isolation, and I read the same exact poem once again and record it. Now, Considering I have these two ...
William The conqueror's user avatar
0 votes
1 answer
278 views

Why is the error between the desired signal and estimated signal in the case of LMS filter remaining constant even after n number of iterations

I am giving white noise as input to an adaptive filter which is initialized to zero (value of filter coefficients of adaptive filter is 0). I am getting a desired response $d(n)$ by passing white ...
Deepa's user avatar
  • 315
0 votes
0 answers
507 views

removing noise using Scipy.signal.butter:

I am going to remove the noise from a brain recorded signal. It was a continuous recording and with sample rate=30kHz, it was digitized. So now it is a digital signal. I have written the code here ...
Zeinab Mo's user avatar
5 votes
2 answers
275 views

Minimum statistics noise estimate - how to calculate the underestimation factor?

I have implemented a basic noise estimator using the minimum statistics method. Noise power estimate is obtained as a minimum of the short time power estimate within a window of subband power samples. ...
Danijel's user avatar
  • 492
0 votes
2 answers
851 views

how a signal for which calculate RMS can be filtered and have a fast settling time?

i designed a sinusoidal pwm amplifier (3KHz to 20KHz) that regulates its output voltage reading the RMS value of output current. The RMS is obtained squaring the signal sampled by AD converter @...
franticSE's user avatar