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Spectral Analysis

Tool to perform spectral analysis of audio files (WAV, MP3, etc.) and display any hidden data in sound frequencies and their visualization.

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Spectral Analysis -

Tag(s) : Steganography

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# Spectral Analysis

## Spectral analyzer of Signals

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## Answers to Questions (FAQ)

### What is spectral analysis? (Definition)

Spectral analysis is a signal processing technique used to study the frequency properties of a signal. It allows a signal to be broken down into its frequency components to better analyze its structure and characteristics.

It makes it possible to characterize the signals, identify the dominant frequencies, detect anomalies, filter noises, and facilitate data compression, etc.

### How does spectral analysis work?

Spectral analysis is based on the transformation of a time signal into a frequency spectrum using mathematical methods such as the Fourier transform.

### How to find a text in an audio file?

A devious practice consists of manipulating frequencies to insert data into an audio file. Sometimes a text (some letters) or an image (rather a silhouette) is hidden in the sound spectrum.

dCode allows playback of audio files (WAV, MP3, etc.) and analysis of sound frequencies to render it in different colors and positioned on a sound frequency axis (logarithmic scale).

A list of free tools to get a spectral analysis or audio spectrum:

Example: Audacity: here (Menu Analyze then Spectrum).

Example: AVS Audio Editor: here (Button Spectral in the toolbar).

The tools offer other options such as representation of the signal or sound frequencies.

### How to hide a text in an audio file?

dCode suggests these tools (free):

Example: Coagula Light: here (Draw with the brush in the left window (black) then click Sound> Render Image, then File> Save sound As).

## Source code

dCode retains ownership of the "Spectral Analysis" source code. Except explicit open source licence (indicated Creative Commons / free), the "Spectral Analysis" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or the "Spectral Analysis" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "Spectral Analysis" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app!
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Cite as source (bibliography):
Spectral Analysis on dCode.fr [online website], retrieved on 2024-06-14, https://www.dcode.fr/spectral-analysis

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## Questions / Comments

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