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
When multiple EVP recordings from the same location contain voices using consistent vocabulary or recurring phrases across different sessions, investigators refer to this pattern as what?
Answer: Cross-session corroboration or communicative consistency
Recurring, consistent communication across multiple independent sessions is considered stronger evidence of intelligent interaction and is called cross-session corroboration.
A high-pass filter applied during EVP analysis is primarily used to eliminate which type of noise?
Answer: Low-frequency rumble from HVAC systems, footsteps, and traffic
A high-pass filter allows high frequencies to pass while cutting low frequencies, removing rumble and vibration noise that can mask or mimic voice recordings.
According to Konstantin Raudive's classification system, what distinguishes a Type 2 EVP voice from a Type 1 voice?
Answer: Type 2 is inaudible without headphones; Type 1 is audible through speakers
Raudive's classification distinguishes voices by audibility level, with Type 2 requiring headphones for perception while Type 1 is audible on standard playback.
Which environmental condition is considered one of the most significant natural causes of false EVP due to its ability to create infrasound that causes psychological effects and audio artifacts?
Answer: Infrasound-generating HVAC systems or structural resonance
Infrasound from HVAC systems or structural resonance can cause feelings of unease and create low-frequency audio artifacts frequently mistaken for paranormal voices.
What is the purpose of conducting an EVP pre-investigation sweep before investigators enter a location?
Answer: To capture baseline ambient audio that documents normal environmental sounds before investigator contamination
A pre-investigation sweep records the location's natural acoustic environment before investigators arrive, creating a baseline to compare against session recordings.
When submitting EVP evidence to a peer review organization, which file and documentation requirement is most commonly required for chain-of-custody purposes?
Answer: Unaltered original file with documented metadata including date, time, location, and recorder model
Chain-of-custody standards require the original unaltered recording with documented metadata to verify authenticity and allow independent verification.
An investigator notices an EVP appears only in the left channel of a stereo recording. What is the most likely mundane explanation for this single-channel anomaly?
Answer: A localized source such as a nearby investigator whispering close to one microphone capsule
A single-channel anomaly most likely indicates a sound source physically closer to one microphone capsule, such as a nearby investigator, rather than a paranormal event.