Solveyg

Audio Editor System

This audio file editor is designed to study the spectra of short duration fragments of audio files. Spectra can be viewed in a time window of up to 1 ms.

Key Points

Construct and study spectra of speech sounds for audio fragments of up to 1 ms

Select speech pauses in the audio file automatically

Calculate signal-to-noise ratio (SNR) automatically

Use “human ear” filter

About Solveyg

Description

Solveyg audio editor is a complementary tool to other Silentium software. It automates some of the routine tasks that forensic experts have to do regularly.

An automatic selection of speech pauses in the audio files is a useful tool for audio files analysis. For the entire phonogram and each pause, an automatic calculation of the signal-to-noise ratio is done with data output to the viewing window.

Another important feature is a “human ear” filter. This filter simulates the dependence of human hearing on the specific amplitude of the spectrum of the sounds.

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Technology

Solveyg audio editor relies on the methodology of spectral transformations for the construction and the following study of spectra for speech sound patterns. When constructing the spectra, a discrete non-orthogonal Morlet transform is used. This allows to obtain spectra with a frequency step of 1 Hz., even for shorter audio fragments with the duration less than 20 ms.

While using the orthogonal discrete Fourier transform, the number of discrete frequencies of the spectrum is determined by the audio fragment’s length. For the duration of 20 ms the Fourier spectrum has components with a multiplicity of 50 Hz while auditory analyzers of the human brain only have a frequency resolution of 1 Hz.

This is why “human ear” filter is one of the important features of the Solveyg editor. This filter simulates the dependence of the amplitude of the spectrum of the sounds of the human auditory apparatus as a function of the conversion frequency.

Source Audio Requirements:
  • The system works with audio files of most formats;
  • There is an integrated audio file converter for formats: .mp3, .ac3, .aac, .ogg, .wma, .aiff, .asf, .au, .flac, .mp2, .avi, .flv, .mp4, .m4a;
  • The file converted to .wav format appears automatically in the directory of the conversion file.
Hardware Requirements:
  • Processor: from 2 GHz
  • RAM: at least 4 GB (preferably 8 GB)
  • OS: Windows 10 (64 bit)