Questions tagged [noise-cancellation]

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How does noise reduction for speech recognition differ from noise reduction that is supposed to make speech more "intelligible" for humans?

this is a question that has interested me for some time now, mainly because I'm working on noise reduction for an existing speech recognition system myself. Most papers on noise reduction techniques ...
marlonfl's user avatar
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6 votes
2 answers
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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
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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
5 votes
1 answer
91 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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5 votes
3 answers
924 views

Proof-of-concept for active noise cancellation to block consistent low-frequency HVAC noise transmission

Background We live in a multi-unit building where each unit's HVAC system/closet is located directly across a party-wall from the neighboring unit's bedroom, and adjacent to a shared external curtain ...
rjacobs's user avatar
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5 votes
2 answers
253 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
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4 votes
4 answers
2k views

Noise reduction using multiple recordings of the same signal

I have two (audio) recordings of one analog signal, I used two separate devices (smart-phones) recording from two different locations. Each recording device is pretty crappy, lot's of electrical hum ...
Reuben Crimp's user avatar
4 votes
2 answers
470 views

How to filter very low amplitude staircase signal from a background noise

I have a staircase signal of a specific pattern that is drowned in a background noise. The ratio of signal to noise amplitude is nearly $10^{-4}$. I have attached the image of both with this post. I ...
Bahauddin Omar's user avatar
4 votes
2 answers
330 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
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4 votes
1 answer
2k views

Are there any open source libraries for Adaptive noise cancellation?

I'm creating a chat application where people can input text via speech and I need to implement noise cancellation using Adaptive noise cancellation technique. I'm using dual microphones for this ...
Suhas Rangaswamy's user avatar
4 votes
1 answer
365 views

Noise Characterization

I am working on characterization of noise in an experimental signal from an accelerometer, mounted on a beam. Normally, white gaussian noise is considered by several researchers to add noise in the ...
ayisha nayyar's user avatar
3 votes
2 answers
527 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
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3 votes
1 answer
597 views

Hardware requirements for ambient active noise cancallation system using adaptive LMS

Background I'm working on a hobby project to reduce ambient low-frequency noise generated from HVAC equipment within a small area of a room. The noise is predictable and concentrated between 55Hz and ...
rjacobs's user avatar
  • 211
3 votes
1 answer
621 views

Remove Noise from Physiological Signals [duplicate]

I have collected a set of physiological signals through emg sensors. I will link at the end of the post an example (10 sec.) of a signal collected on zygomatic muscle. When I analyzed these data, I ...
youngz's user avatar
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3 votes
1 answer
127 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
3 votes
0 answers
118 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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2 votes
1 answer
648 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
2 votes
1 answer
176 views

Can I have some feedback on this research paper?

I have submitted this paper "Effect of Transducer Positioning in Active Noise Control" to arXiv. I would like to get some feedback on the methodology of the same. Inputs of any sort are welcome. Can ...
Sajil C K's user avatar
  • 149
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
2 votes
1 answer
260 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
  • 39
2 votes
2 answers
312 views

Magnetometer coil equalization

I have a search coil magnetometer with two coils, one at each end of a ferromagnetic core of high magnetic permeability: Figure 1. Double search coil magnetometer. (Modified from a drawing CC BY-SA 3....
Olli Niemitalo's user avatar
2 votes
1 answer
750 views

Reduce noise of sensor by combining two

I've had the basics of signal in university but little real-life practice. I've got an acceleration sensor with a digital output signal (signed 16 bit value). This signal is a little noisy. The ...
GNA's user avatar
  • 123
2 votes
1 answer
3k views

Real time background noise reduction or removal

I am trying to build a real time simple audio recognition that can recognize few keywords. Following this tensor flow tutorial i was able to train a simple neural network. Currently the signal flow ...
BhanuKiran's user avatar
2 votes
2 answers
842 views

efficient Noise cancellation & suppression algorith to use in VoIP for low latency

I am working on Noise suppression and cancellation in VoIP media engine. I am looking for noise cancellation & suppression algorithms and its implementation available with real-time low latency ...
Nishant Bijani A's user avatar
2 votes
1 answer
785 views

Noise removal using adaptive noise cancellation algorithms in real time systems

I am newbie in signal processing. I want to remove noise from real time audio signal using adaptive noise cancellation(LMS&RLS) algorithms. I don't know how to choose reference signal(noise signal)...
Nandana's user avatar
  • 31
2 votes
1 answer
137 views

What techniques/algorithms can I use to reduce noise when recording audio?

I'm making a handmade guitar chords dataset by recording 20480 samples of a 44.1kHz microphone to later on make a chord classification using CNN. But there's a problem... I'm making this dataset on my ...
denisb411's user avatar
  • 123
2 votes
0 answers
444 views

Feedback Filtered-x LMS algorithm: question about theory

I was reading some of papers about the Active Noise Cancellation; in particular about the Filtered-x LMS algorithm, also known as FxLMS. It seems that classic FxLMS (also called Feedforward FxLMS) ...
rainbow's user avatar
  • 197
1 vote
2 answers
52 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
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1 vote
3 answers
816 views

Why use cross-spectral density to calculate frequency response?

I am taking a class about system identification and currently learning about cross-spectral density. My textbook says that the frequency response, G, of a system can be determined as $$G=\frac{S_{yu}}{...
SirCumference's user avatar
1 vote
1 answer
99 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
177 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
1 vote
1 answer
292 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
2 answers
187 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
1 vote
1 answer
107 views

Intelligent Noise Removal in Data

This question is linked to this question: I have this data: ...
henry's user avatar
  • 111
1 vote
1 answer
1k views

Background Noise Reduction in Audio signal

I using high pass filter for reduction or removal of noise of audio signal but still some noise is there in signal.i have MIC,Head Set,Bluetooth and phone are connected to controller,while talking on ...
mani's user avatar
  • 23
1 vote
0 answers
38 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
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
1 vote
0 answers
91 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
  • 135
1 vote
0 answers
830 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
1 vote
0 answers
128 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
0 answers
457 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
1 vote
1 answer
193 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
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
  • 2,602
1 vote
0 answers
168 views

Effect of filtering on Energy of a Digital Signal

I am trying to detect (not remove) noise from the digital signal to get meaningful information out of it. The signal I need is in the frequency range of 0.1 Hz to 10 Hz. Anything beyond this is just ...
Aashit's user avatar
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1 vote
0 answers
296 views

How to estimate noise by eigendecomposition of the variance covariance matrix?

I'm new here so I will try to be as clear as possible. I am trying to apply some techniques from signal processing framework to denoise financial time series. I would like to know if what I am ...
Chaos's user avatar
  • 143
1 vote
0 answers
38 views

NLMS Echo Cancellation: How do we estimate when the time-step at which the Far-End Echo will be generated?

I'm new to this domain. From my understanding, we do the following in our algo: ...
spade123's user avatar
1 vote
0 answers
90 views

Adaptive algorithm for active noise control

I'm looking at building a cost-effective active noise control system. Basically, the system comprises two microphones - one reference and one error. A DSP unit samples and phase flips the reference ...
Thomas Shemeld's user avatar
1 vote
2 answers
1k views

Removing noise from PCM file [closed]

I want to implement basic noise reduction. I'm recording audio using a microphone mounted on a drone. I would like to filter the audio file from drone noise. What's the best way to do it ? My first ...
dawzaw's user avatar
  • 113
1 vote
1 answer
44 views

Overview of regression methods between the data

I am trying to find different approaches (classic and modern) in order to find a regression function between data (in time domain) with high-frequency noise. Consider the result of this code (in ...
youngz's user avatar
  • 53
1 vote
0 answers
109 views

Signal chain for voice calls including adaptive noise cancellation, adaptive echo cancellation, and automatic gain control and their algorithms

I am trying to understand the entire signal chain and all the algorithms associated with adaptive filtering as mentioned in the case above. From my understanding: Adaptive noise filtering (ANF)- can ...
Akhilesh Rao's user avatar