Voice Analysis

Audio/Video Forensic & Restoration Associates can utilize voice comparison (a test of audio samples against each other) to determine if the same person was recorded on two voice recordings.

We will enhance and transcribe an unknown voice recording. Then in conjunction with Audiomatrix Studio, A/VF&RA will record an exemplar (known) sample at our facility, either in person or over the phone.

Samples are compared in a computer based spectrum analysis. This process produces what is generally called an “FFT” or Fast Fourier Transform.

Voice Analysis

Audio/Video Forensic & Restoration Associates –

2 Step Voice comparison process:

Step 1:

The Computer Based Spectrum Analysis:

  • Using our Digital Audio Workstation (D.A.W.) we will enhance and transcribe the “unknown” voice recording.
  • An “exemplar” sample will be recorded at our facility (Using our sister company Audiomatrix Studios)
    • This can be done either by phone or in person
  • We match the words from both the “unknown” and “exemplar” samples.
  • These matched words are then compared using the Computer Based Spectrum Analysis.
    • The result is a graphic print displaying two lines for each pair of word samples.
  • The sets of graphs are examined and compared.
A specified frequency range of human voice is measured in Hertz

Step 2:

Qualified Aural Listening:

  • With repeated listening to the comparison samples, a subjective but informed impression is reached based on the following factors of Speech and voice qualities:
    • Timbre/Tone
    • Accents
    • Gender
    • Age
    • Emphasis of words and phrases
    • Inflection
    • Cadence (How words and phrases are grouped together by the individual)
  • Our Associates have many years of experience listening to audio recordings, transcribing voices and performing voice analysis. This allows us to determine with a reasonable degree of certainty if the voices are:
    • Likely matches
    • Not likely matches
    • Inconclusive
We finish with a written report including the FFT graphs