Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [noise-cancellation]

The tag has no usage guidance.

0
votes
1answer
27 views

how does the Frequency spectrum of a signal change in the logarithmic space?

I am trying to implement basic homomorphic filtering but I can't seem to understand what happens in the frequency domain when you take the natural logarithm of the function. In Matlab I'm getting not ...
1
vote
1answer
42 views

Intelligent Noise Removal in Data

This question is linked to this question: I have this data: ...
0
votes
0answers
64 views

Remove background noise from audio signal

I am looking for a python or matlab code to take an input audio signal, process it and remove any background noise other than the infant cry such as vehicle noise or a human talking noise and get the ...
1
vote
0answers
58 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) ...
0
votes
0answers
30 views

How can I quantify the distortion in a speech signal?

I am working with certain speech enhancement algorithms, for instance to remove stationary noise or impulse noise from a speech signal. Filters such as those can enhance the speech signal, but they ...
0
votes
1answer
63 views

How do I know what is causing the noise in my signal

I have a noisy audio file, available here (It is safe to download if you wish to) https://ufile.io/pstrt Now, I inspect it in matlab: And then i plot it on normalised frequency: Now I need to ...
0
votes
1answer
27 views

Cancelling out known signal with sampling offset

I would like to cancel out a known audio signal at my receiver. Specifically at my transmitter I am playing a song, and at my receiver I am recording it. Both transmit and receive sampling rate is 44....
1
vote
0answers
71 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 ...
1
vote
1answer
509 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 ...
1
vote
0answers
23 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: ...
-1
votes
1answer
135 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 ...
0
votes
1answer
38 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 ...
2
votes
0answers
64 views

Common mode signal cancellation on multi-channel system

I have a system consisting of 32 horizontal plus 32 vertical charge sensitive wires. They are part of a particle detector and each one is coupled to a charge amplifier consisting of preamp stage ...
1
vote
1answer
144 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 ...
0
votes
0answers
22 views

ways of interference cancellation in WiB signals

I m working in broadcast company so , this company using DTT ( digital TV terrestrial) . The new research studying about technology using a single wide-band signal instead of narrow signal (8 MHz) ,...
3
votes
1answer
172 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 ...
0
votes
0answers
45 views

Construct a signal that is multiplied by a white noise?

Can we reconstructs a signal after it is being multiplied (not added) by a random noise (not with the normal distribution)? Lets say I have S=10*sin(2*pi*5*t) for t=[0:.001:1] and I have a random ...
0
votes
0answers
47 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 ...
1
vote
2answers
170 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 ...
0
votes
1answer
217 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)...
-1
votes
2answers
1k views

ImageJ: How to remove image artifacts due to dirty camera lenses? [closed]

I have an image of interest and would like to remove the artifacts from it (black dots, which are probably dust on camera lenses). How can I do it using the ImageJ (FIJI)?
4
votes
1answer
956 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 ...
0
votes
1answer
2k views

Removing high pitch noise embedded in audio spectrum

I have an audio clip. Here is the clip in wave format https://www.dropbox.com/s/542jgpfk7bfkt01/sample.wav?dl=0 I chose the following area of time domain signal The spectrum of this signal shows ...
1
vote
1answer
127 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 ...
1
vote
2answers
539 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 ...
2
votes
1answer
298 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 ...
0
votes
1answer
65 views

Extract same in phase signal from 3 different sources with shared delayed noise?

If I have 3 signals coming from 3 microphones with noise $n$ delayed like this: $S_1(t) = x(t) + n(t+\phi_1)$ $S_2(t) = x(t) + n(t+\phi_2)$ $S_3(t) = x(t) + n(t+\phi_3)$ Their shared feature $x(t)$...
1
vote
1answer
33 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 ...
2
votes
1answer
77 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 ...
1
vote
0answers
60 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 ...
1
vote
0answers
544 views

Noise cancellation using RLS filter

I am trying to create an adaptive noise canceller using the RLS algorithm. The dsp toolbox from matlab offers the RLS adaptive filter already implemented, so this saved me some trouble. My goal is to ...
9
votes
1answer
1k views

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 ...
0
votes
2answers
346 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_{uy}}...
1
vote
0answers
144 views

Fixed point Error Spectrum Shaping (noise shaping) for biquads

Based on that article and all the resources on the internet that advise the use of noise shaping for fixed-point filter implementations, I tried to make a few simulations on Matlab for the biquad I'm ...
2
votes
2answers
257 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....