fft.js | The fastest JS Radix-4/Radix-2 FFT implementation | Video Utils library

 by   indutny JavaScript Version: Current License: No License

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kandi X-RAY | fft.js Summary

kandi X-RAY | fft.js Summary

fft.js is a JavaScript library typically used in Video, Video Utils applications. fft.js has no bugs, it has no vulnerabilities and it has low support. You can install using 'npm i fft.js' or download it from GitHub, npm.

Implementation of Radix-4 FFT.
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              fft.js has a low active ecosystem.
              It has 181 star(s) with 23 fork(s). There are 7 watchers for this library.
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              It had no major release in the last 6 months.
              There are 1 open issues and 7 have been closed. On average issues are closed in 7 days. There are 1 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of fft.js is current.

            kandi-Quality Quality

              fft.js has 0 bugs and 0 code smells.

            kandi-Security Security

              fft.js has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              fft.js code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              fft.js does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
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              Without a license, all rights are reserved, and you cannot use the library in your applications.

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              fft.js releases are not available. You will need to build from source code and install.
              Deployable package is available in npm.
              Installation instructions are not available. Examples and code snippets are available.

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            fft.js Examples and Code Snippets

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            Community Discussions

            Trending Discussions on fft.js

            FFT from libraries have lower levels than Web audio FFT

            QUESTION

            FFT from libraries have lower levels than Web audio FFT
            Asked 2018-Jun-15 at 15:59

            I am trying to graph FFT from microphone input in the web browser. I created an object that plots the FFT result into a canvas. I first used the frequency data of a web audio analyzer (https://developer.mozilla.org/en-US/docs/Web/API/AnalyserNode/getByteFrequencyData) and got the plot that appears in black. It detects considerable levels for most frequencies until nearly 0.5 per sample. First graph is the FFT and the second is the captured microphone noise.

            Later I did exactly the same, this time using fft.js (https://www.npmjs.com/package/fft.js). The resulting FFT looks barely populated, even though I have expanded the vertical axis (top left number is the maximum value in the graph)

            I feel that there is a concept that I am missing out, and I would like to know: why the two FFT's have such different results? Do I need to shape the input or the output from a scale to another?

            ...

            ANSWER

            Answered 2018-Jun-15 at 15:59

            You might be comparing apples and oranges here. According to the spec for getByteFrequencyData, the values you get are on a dB scale.

            The values from the FFT library are probably linear. If so, you'll need to convert that to dB before comparing results. (Or convert the byte frequency data to linear).

            Note also, that WebAudio applies a windowing function before computing the result. This will probably make it different from your FFT result unless you also apply the same windowing function.

            Source https://stackoverflow.com/questions/50877645

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install fft.js

            You can install using 'npm i fft.js' or download it from GitHub, npm.

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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