CPI Audio & Video Evidence Review 5

Question 1

What does a 'full spectrum' camera capture that a standard consumer video camera does not?

Accepted Answer

Near-UV and near-IR light outside the visible spectrum, which some investigators believe may reveal anomalies

Answer

Full spectrum cameras have had their IR-blocking filter removed, allowing them to record near-ultraviolet and near-infrared light that standard cameras block, which some paranormal investigators believe may capture phenomena invisible to the naked eye.

Question 2

An investigator notices a recurring audio anomaly at exactly 60 Hz. What is the most probable cause?

Accepted Answer

Electromagnetic interference from AC electrical wiring or equipment inducing a 60 Hz hum

Answer

60 Hz is the frequency of AC electrical current in the US; interference from wiring, power supplies, or unshielded cables commonly induces a 60 Hz hum into audio recordings.

Question 3

Why is it important to document the temperature and humidity conditions during video evidence collection?

Accepted Answer

Condensation mist, fog breath, or thermal anomalies can create visual effects that are mistaken for apparitions

Answer

Breath condensation in cold air, water vapor, and temperature-related visual effects can appear on camera as mist or moving shapes that mimic apparitions, so environmental data allows reviewers to rule out these causes.

Question 4

What is the recommended minimum sample rate for recording EVPs to ensure voice frequencies are accurately captured?

Accepted Answer

44,100 Hz (44.1 kHz)

Answer

44,100 Hz (CD quality) satisfies the Nyquist theorem for capturing all frequencies within the human hearing range (up to ~20 kHz) without aliasing distortion, and is the standard recommended minimum for EVP work.

Question 5

During evidence review, an investigator plays an EVP clip to ten colleagues; five hear a voice saying a word and five hear nothing. How should this EVP be classified?

Accepted Answer

Class C, because it lacks consensus and is barely discernible

Answer

A Class C EVP is very faint or unclear, with no consensus among listeners; a 50/50 split with some hearing nothing aligns with the Class C 'barely discernible and contested' description.

(CPI) Certified Paranormal Investigator Practice Test

(CPI) Certified Paranormal Investigator Practice Test

CPI Audio & Video Evidence Review 5