Animal Welfare Institute

Brudzynski, S. M. 2019. Emission of 22 kHz vocalizations in rats as an evolutionary equivalent of human crying: Relationship to depression. Behavioural Brain Research 363, 1-12.

There is no clear relationship between crying and depression based on human neuropsychiatric observations. This situation originates from lack of suitable animal models of human crying. In the present ...
Animal Welfare Institute

Hwang, S.-K., Tyszkiewicz, C., Dragon, M. et al. 2022. Introduction of gloved hand to cage induces 22-kHz ultrasonic vocalizations in male albino rats. PLOS ONE 17(11), e0278034.

Rodents emit ultrasonic vocalizations (USVs) above the human hearing threshold of ~ 20 kHz to communicate emotional states and to coordinate their social interactive behavior. Twenty-two kHz USVs ...
EDN

Reception of Radio Waves Below 22 kHz

In these low-frequency bands, the signals are not heard in loudspeakers or headphones, or rather, the emission of sounds could occur but it is not the main activity, as is normally the case on other ...
EDN

DiSEqC Tester with 22 KHz Tone Support

An AVR project that tests the DiSEqC swtiches which use 1.0 or 1.1 protocols. Additionally the tester supports 22 kHz tone mode. An AVR project that tests the DiSEqC swtiches which use 1.0 or 1.1 ...