Topic: Audio Frequency

3 chapters across the catalog

Checkpoint Nation
Episode 225 13:01 - 14:45

225: Checkpoint Nation

Stealth Tones and Age-Related Hearing Tests

A brief experiment is conducted using "Stealth Tones," which are high-frequency sounds supposedly only audible to younger people. The test fails to produce results over the stream, leading to a discussion on how low-bitrate audio compression strips out the necessary frequencies for such tests.

One Big Ponzi Scheme
Episode 61 41:13 - 45:33

61: One Big Ponzi Scheme

Lavalier Microphones, Heil PR40, Audio Notch Filters

Adam Curry describes a "cockamamie" microphone setup involving a Lectrosonics lavalier clipped to a windscreen in front of a Heil PR40. The hosts discuss the use of notch filters to remove "mud" or unwanted frequencies between 200 and 400 Hertz to improve vocal clarity in recordings.