Signal Processing Stack Exchange
Signal Processing Stack Exchange

Questions tagged [real-time]

real-time refers to processing done with a strict set of time constraints in a deterministic manner.

141 questions
37
votes
5 answers

Determining the mean and standard deviation in real time

What would be the ideal way to find the mean and standard deviation of a signal for a real time application. I'd like to be able to trigger a controller when a signal was more than 3 standard deviation off of the mean for a certain amount of time. …
jonsca
  • 1,914
  • 3
  • 21
  • 39
15
votes
4 answers

Most efficient way to extract frequency components of audio signal with near-human accuracy in real time

I'm trying to work out how (if possible) to extract the frequency components of an arbitrary audio sample (typically music) in an FFT-like manner, but in my research on the FFT algorithm, I'm learning that it suffers some severe restrictions for…
bryhoyt
  • 1,353
  • 3
  • 11
  • 14
12
votes
3 answers

How to detect "fast" changes in signal processing

I'm working on a project where we measure the solderability of components. The measured signal is noisy. We need to process the signal in real time so that we are able to recognize the change that begins at the time of 5000 milliseconds. My system…
Petr
  • 121
  • 1
  • 4
9
votes
1 answer

Detect human speech in realtime audio on mobile phones

I am looking to develop an Android app. As part of the functionality the app would require to randomly sample 3-5 seconds of audio and classify it as containing human speech or not. I understand that this concept is called Voice Activity…
Dony George
  • 113
  • 3
8
votes
4 answers

Is real-time signal processing possible under Windows?

This question is related to on How to decide what platform is best to implement real-time audio processing on?, but focusing on Windows. I'd like to be able to take input from a data acquisition board and process it (either through Matlab or a…
jonsca
  • 1,914
  • 3
  • 21
  • 39
8
votes
2 answers

Filtering a digital signal online in real-time using python

I am currently trying to apply a bandpass filter to a signal in real-time. There are samples coming in with a constant sampling rate and i would like to calculate the corresponding bandpass filtered signal. What would be the best way to do this? Do…
BStadlbauer
  • 197
  • 1
  • 1
  • 4
7
votes
1 answer

How do real-time convolution plugins process audio so quickly

Okay, so in Logic Pro I can load up a Space Designer plugin (convolution reverb) with an impulse that's 9.1 seconds long, turn my mic on, and get real-time convolution reverb as the mic records incoming audio. My question is: How could this be…
Aaron Dawson
  • 73
  • 1
  • 4
7
votes
1 answer

YIN Pitch detection Algortithm ( how do I improve my results )

I am using YIN algorithm in a school project of mine which uses pitch detection on guitar sound. I when I play a note I get random frequencies at the beginning until they stabilize. I am thinking those are probably from action of pick on the…
Ajit
  • 173
  • 1
  • 4
6
votes
3 answers

Conceptually, how does real time convolution reverb work?

I've got an impulse response of a hall, it's 10 seconds long. Now say I want to apply this reverb to a wav file of some singing. I would perform a convolution of the data in two wav files and that the result would be a third lot of data, this time…
user5695
4
votes
2 answers

Two real time signals convolving

This might be a stupid question but is it possible to convolve two real-time signals together? I know that generally for running convolution you have the IR and the block of the real time signal and then you convolve them both, making sure you have…
gabrielzalles
  • 51
  • 7
4
votes
5 answers

Computing the derivative from a set of real-time data?

So I have an array of say 25 samples and I would want to be able to note the trends of whether it's decreasing n or increasing from those 25 sample time interval(basically 25 samples array is my buffer that is being filled by every say 1 ms). Note…
as3rdaccount
  • 155
  • 1
  • 5
4
votes
2 answers

Can deep neural networks achieve real-time video analysis?

Recently, convolutional neural network based, deep architectures (DNN) such as AlexNet and VGGnet have been very successful in image classification challenges (e.g. ImageNet) and action recognition/video classification tasks. They surpassed…
chronosynclastic
  • 377
  • 1
  • 6
  • 13
4
votes
1 answer

How is a realtime BiQuad/IIR possible?

I was thinking, if a realtime system is one in which the processing time is shorter than the sampling period, how does a feedback filter such as a biquad perform the computation without waiting for, say, in the case of the biquad, two additional…
panthyon
  • 1,083
  • 11
  • 24
3
votes
1 answer

Detecting background noise from audio time-freq domain analysis

I have a requirement to detect/reduce sidetalk/background noise in real-time audio. I am stuck in how can I detect this from audio time-frequency domain analysis. I am already getting the time-freq data from stft (I am using java for an easier way…
Nafiul Alam Fuji
  • 161
  • 5
3
votes
2 answers

Real Time Partitioned Convolution Not Working

EDIT: Scroll down for actual working code. I'm working on implementing a real-time convolvution reverb JACK client on C and I've been trying to follow a number of sources (including Gardner and Wefers (pages 110-111) ) to no avail. I've tried to…
Juan F.
  • 53
  • 4
1
2 3
…
9 10