Signal Processing Stack Exchange
Signal Processing Stack Exchange

Questions tagged [java]

is a multiplatform computer programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few implementation dependencies as possible.

60 questions
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How to analyze audio input/spectrum correctly

I am quite new to Java and Signal Processing, but I was assigned a project dealing in audio processing. My topic given to me is a game that has a component of analyzing a song (any given song) and outputs data depending on the frequency currently…
user3241507
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Improving an auto-correlation based guitar pitch detector

I've seen many questions on this forum regarding pitch detection for musical instruments (commonly guitar), and spent a while reading through the answers to create a basic implementation of auto-correlation to make an Android guitar tuner. This is…
Sevag
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Detecting a single frequency in noisy data

I am not very experienced in signal processing, and it seems like this should be a simple problem. I have two computers, one plays a tone a 19 kHz at a sampling rate of 44.1 kHz, and the other listens with a sampling rate of 44.1 kHz and tries to…
Batman
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Advice on autocorrelation via FFT

I have been creating an application in Java that transforms an audio signal and writes it to a midi file. At first I tried using autocorrelation to find the fundamental frequency. However, I have been having difficulties implementing it. I resorted…
user1266174
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How to Measure the Intensity / Saturation of a Color in an Image?

I have a task of developing an application to measure the intensity of a color in an image. I am researching about how to go about it. Intensity refers to the purity of a hue. Intensity is also known as Chroma or Saturation. The highest intensity…
Solace
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Upsampling PCM audio: from 6 kHz to 8kHz

What would a straight-forward way to convert an audio payload (PCM 16bit) from 6 kHz to 8kHz? I understand that this is an interpolation problem. I fear that a linear interpolation would introduce too much noise. If so, what would be a better…
gawi
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Correlation Using FFT / IFFT (Convolution in Frequency Domain) in Java

I try to find about the delay between two audio files using Cross Correlation in Java. I've already done this algorithm so far that i get a idea about how many samples is the delay. FFT x1 -> Zero Padding to length: x1.length() + x2.length() FFT…
christopo
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is root mean square possible to calculate similarity of FFT result?

I need to compare FFT result from audio files, I have 2 FFT result from 2 audio files.. FFT 1 (sample) -0.16314493488504767 - 0.103707391105263i 0.07863935536550609 - 0.30111206509352917i 0.06753127619272284 + 0.02837438103569126i FFT 2…
raisa_
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What do I measure in a Sound Sample Buffer to remove noise from an audio file using the Kalman Filter?

I am developing a computer program that removes or reduces the background noise from an audio file using the Simple Kalman Filter. I have implemented the Kalman Filter and a way of obtaining the "sample buffer" for the audio file. I understand how…
Marvin
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Performing DFT of streaming audio problem. Is there a limit?

I am trying to write software that will perform the discrete fourier transform of real time data coming from the microphone into the sound card on a computer. I am using Java with the javax.sound APIs. I am capturing 250 ms of data each time. That…
Engineer999
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How to set sampling frequency of an acceleration data set

I have a set of accelerometer readings in $X, Y, Z$ axes obtained from an android based smart-phone. The data in $(X, Y, Z)$ was recorded at different time stamps and there is no uniform time period for recording the data. My data set looks as …
user26161
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How to implement anisotropic diffusion using java?

I am working on an image processing project in java where we use anisotropic diffusion for scale space generation. In the below equation, after finding the diffusion value.using the second equation, I do not know how to find the divergence of…
Anju Davis
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Fixing my FFT Plot

I'm trying to plot my FFT of File. This i my result. I made my FFT application: I want to obtain something very similar to plot of WaveSpectra, please tell me my mistakes.. My FFT The result from WaveSpectra Other result from WaveSpectra Here my…
joseluisbz
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Hilbert-Huang Transform Implementation

I am looking for a implementation of Hilbert-Huang Transformation. Ideally, in Java, but any language with similar syntax would prove useful. Could someone point me to a specific implementation, preferably in Java?
Skylion
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Matching 2 audio files

I'm doing research on how we can do matching between 2 audio files using Android to see if they have the same content or not. After doing lots of research, I have concluded that I must do 2 main things: FFT Correlation Am I on the right track?
nada
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