EVP Classification & Analysis Flashcards
7 cards from real CPI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 EVP Classification & Analysis flashcards as text
Which EVP class designation is assigned to voices that are clearly audible, require no amplification, and can be understood by most listeners without coaching?
Answer: Class A
Class A EVPs are the highest quality, clearly audible to most listeners without enhancement or prior suggestion.
An investigator records audio near an active electrical panel during an EVP session. The resulting anomalous sounds are most likely attributed to what?
Answer: EMF interference causing audio artifacts
Electromagnetic fields from electrical panels commonly induce false-positive audio artifacts in recording equipment.
During spectral analysis of a suspected EVP, investigators notice the voice appears only in a very narrow frequency band around 1 kHz. What does this suggest?
Answer: The recording may be contaminated by radio frequency interference
Natural human speech covers a broad frequency range; a very narrow band signal often indicates RFI or electronic interference rather than a genuine voice.
What is the term for the psychological phenomenon where listeners perceive meaningful words in random noise, commonly misidentified as EVP?
Answer: Auditory pareidolia
Auditory pareidolia causes the brain to find familiar patterns like voices within random audio noise, a leading cause of false EVP identification.
A Class B EVP requires what additional step before it can be evaluated by a review panel?
Answer: Amplification or noise reduction to be intelligible to multiple listeners
Class B EVPs are not immediately clear and typically require amplification or noise reduction before multiple listeners can assess the content.
Which recording format is generally preferred for EVP capture because it avoids lossy compression artifacts that can mimic voice-like sounds?
Answer: Uncompressed WAV or FLAC
Uncompressed WAV or lossless FLAC files eliminate compression artifacts that could be falsely interpreted as EVP.
When conducting a controlled EVP session, investigators should speak their own voices aloud for which primary reason?
Answer: To establish a clear audio baseline that distinguishes investigator voices from anomalies
Verbally logging all investigator activity creates a reference track that allows analysts to rule out known voices when reviewing recordings.