Discontinuity
Definition
Any point in an audio recording where a physical property of the signal changes abruptly in a way inconsistent with natural acoustic events. In forensic audio, the term refers specifically to edit-point signatures: phase breaks, noise-floor shifts, energy transients, or missing reverberation tails.
- Signal type
- Abrupt, physically inconsistent signal change
- Examples
- Phase breaks, noise-floor shifts, missing reverberation
- Significance
- Signature of a possible edit point
- Field
- Forensic audio authentication
Common questions
Can a discontinuity occur naturally without indicating tampering?+
Yes, a genuine change in recording environment, a device pause, or an automatic gain adjustment can produce a similar signal break, so an examiner corroborates a suspected discontinuity with multiple markers before concluding an edit occurred.
What tools detect discontinuities in a recording?+
Spectrographic analysis, electrical network frequency continuity checks, and waveform-level examination of phase and noise floor are used together, since no single acoustic marker is conclusive on its own.
Related terms
- Background Noise Profiling
- Statistical characterisation of the ambient noise floor in quiet segments of a recording, including its average level, spectral shape, and stationarity. Changes...
- ENF (Electric Network Frequency) Analysis
- A method that tracks the recorded mains-frequency component (nominally 50 Hz or 60 Hz) through an audio file and compares its fluctuation...
- Phase Discontinuity
- An abrupt change in the phase of a periodic component of the audio signal. In a continuous recording, the phase of background...
- Room-Tone Tail
- The natural reverberation that follows a sound event in an enclosed space. Each room has a characteristic decay time and spectral shape....
- Spectrogram
- A time-frequency plot in which the horizontal axis is time, the vertical axis is frequency, and colour or brightness encodes signal energy....