A recording surfaces in a legal dispute. An ex-employee produces a phone call as evidence. An insurance claimant submits audio that doesn’t quite add up. A client insists a recording has been altered, but you need proof.
Audio recordings are easy to manipulate — and increasingly easy to fake. Cuts can be hidden. Words can be rearranged. Silences can be inserted. AI-generated voices can now impersonate real people with disturbing accuracy.
Knowing whether a recording is authentic — or knowing exactly where it’s been altered — can change the outcome of a case.
Media Medic’s audio authentication service provides forensic-grade analysis of audio recordings to determine their integrity, detect signs of tampering, and deliver findings you can act on.
What Audio Authentication Actually Determines
Authentication isn’t a single test — it’s a layered forensic examination. Our specialists analyze a recording across multiple dimensions to reach a defensible conclusion about its integrity.
Is the recording complete and unaltered? We examine the file’s internal structure, waveform continuity, and encoding history to determine whether the recording is an uninterrupted original or has been subjected to editing, splicing, or post-processing.
Has the file been edited or manipulated? Cuts, insertions, deletions, and level adjustments leave traces in the audio signal and file metadata. We identify discontinuities, anomalies in background noise, abrupt changes in recording conditions, and spectral inconsistencies that indicate tampering.
Is the recording consistent with its claimed origin? A recording claimed to be from a specific device, location, or date may carry internal signals that confirm or contradict that claim. Electrical Network Frequency (ENF) analysis can tie a recording to a specific time and place based on the power grid frequency captured in the background.
Could the voice be synthetic or AI-generated? AI voice cloning is now accessible to anyone. We examine recordings for artifacts consistent with synthetic speech generation, including unnatural formant patterns, cloning artifacts, and the absence of expected human physiological signals.
Forensic Authentication Methods We Use
These are the same techniques used by professional forensic examiners in legal proceedings.
Metadata and File Analysis Every audio file contains embedded metadata — creation date, modification history, encoding parameters, device identifiers. We extract and analyze this data to establish what the file’s history tells us about when and how it was created, and whether it’s been processed since.
Waveform and Signal Continuity Analysis An authentic, unedited recording has consistent signal characteristics throughout. We examine the waveform for discontinuities — sudden level jumps, unusual noise floor shifts, or breaks in background ambience — that indicate a cut or splice point.
Spectrographic Analysis A spectrogram visualizes the frequency content of a recording over time. Edits, insertions, and processing operations leave distinctive visual signatures. We examine spectrograms for anomalies that are invisible to the ear but forensically significant.
Electrical Network Frequency (ENF) Analysis Power grids operate at a nominal frequency (60Hz in the US) that fluctuates slightly over time in a pattern that is logged and unique to a specific time period. Recordings made near powered devices capture this signal. ENF analysis can verify — or disprove — the claimed recording date and time.
Compression and Encoding History Analysis Audio files that have been re-encoded or processed after original recording carry telltale signatures in their encoding parameters. We identify re-compression artifacts and inconsistencies in bitrate or codec history that suggest post-recording manipulation.
Critical Listening and Perceptual Analysis Beyond the technical signals, trained ears pick up what instruments miss — unnatural transitions, inconsistent room acoustics, background noise that doesn’t match claimed recording conditions, and subtle artifacts from copy-and-paste editing.
Who Needs Audio Authentication?
Attorneys and Legal Teams Before introducing a recording as evidence — or challenging one submitted by opposing counsel — you need to know if it’s authentic. Authentication analysis supports evidentiary admissibility under Federal Rule of Evidence 901 and its state equivalents.
Law Enforcement and Investigators Voicemails, surveillance recordings, undercover recordings, and witness-submitted audio all require authentication before they can be relied upon in an investigation or prosecution.
Employers and HR Departments Recorded conversations submitted in workplace disputes, harassment claims, or termination proceedings are increasingly common — and increasingly manipulated. Know what you’re dealing with before it reaches a hearing.
Insurance Companies and Adjusters Claimant-submitted recordings and recorded statements can be altered to support fraudulent claims. Authentication analysis protects against evidence manipulation in the claims process.
Individuals in Civil or Family Court Recordings submitted in divorce proceedings, custody disputes, and civil litigation are frequently contested. If a recording is being used against you — or you need to prove one you have is real — authentication is the answer.
How It Works
Step 1 — Submit Your File Upload your audio file securely through our project form. Tell us what you need to know: are you trying to prove authenticity, detect tampering, or challenge a recording’s claimed origin?
Step 2 — Free Specialist Review One of our forensic specialists reviews your file at no charge and outlines what analysis is appropriate and what conclusions we can reasonably reach.
Step 3 — Forensic Analysis We conduct a thorough examination using the applicable methods — metadata analysis, spectrographic examination, ENF analysis, waveform review, and more — depending on what the file and the circumstances require.
Step 4 — Findings Report You receive a clear written report of our findings. What we found, what it means, and what conclusions the evidence supports. Turnaround is typically 5 days or less for standard files.
What Makes a Recording Legally Admissible?
Under Federal Rule of Evidence 901, audio recordings must be authenticated — meaning the party offering the recording must provide evidence sufficient to support a finding that the recording is what it’s claimed to be. This typically requires:
- Establishing the recording device and conditions
- Demonstrating chain of custody
- Showing the recording has not been altered
- Identifying the voices captured
When any of these elements are in dispute, forensic authentication analysis provides the evidentiary foundation needed — or identifies the weaknesses in a recording being used against your client.
Flat Fee. No Surprises.
Audio authentication at other firms can run into thousands of dollars in hourly fees — and the bill grows with the complexity of the file.
Media Medic charges a flat fee per file. You know the cost before we start. Rush processing is available for cases with court deadlines.
Frequently Asked Questions
Can you tell if a recording has been cut or edited? In most cases, yes. Edits leave traces in the waveform, the spectral content, and the file’s encoding history. The clarity of those traces depends on how the edit was made and the quality of the original recording — but our examiners know what to look for.
Can you determine if a voice is AI-generated or cloned? Yes. AI-generated and cloned voices carry artifacts that differ from authentic human speech. We analyze recordings for synthetic speech signatures as part of our authentication process when relevant.
What is ENF analysis and how does it work? Electrical Network Frequency (ENF) analysis examines the power grid frequency captured as background signal in a recording. Because grid frequency fluctuates in a logged, time-specific pattern, ENF analysis can verify or disprove a recording’s claimed date and time of creation.
Can authentication findings be used in court? Our findings and reports are prepared for professional use and can support legal proceedings. If you need expert witness testimony in addition to a written report, contact us to discuss your case requirements.
What if the recording is very short or poor quality? Short recordings and poor-quality files can still be authenticated — the analysis simply focuses on what signals are available. We always review the file first and tell you what conclusions are realistic before any work begins.
How is this different from just cleaning up audio? Enhancement and authentication are different services with different purposes. Enhancement improves what you can hear. Authentication determines whether what you’re hearing is genuine. We offer both — and many clients need both on the same file.
What formats do you accept? All common audio and video formats: MP3, WAV, MP4, MOV, M4A, AAC, WMA, AVI, and more.
Submit Your Recording
If you need to know whether an audio recording is authentic — or whether one being used against you has been tampered with — we can help.
Free specialist review. Flat fee. Results in 5 days or less.
Related services: Forensic Audio Enhancement | Dialogue Cleanup Service | Video Cleanup Service
