tomsharpAug 9, 2024
In 1901, Reginald Fessenden invented heterodyning for combining frequencies, the basis of AM radio transmission. #Poetry #Science #History #Electromagnetism #Heterodyne #Fessenden (https://sharpgiving.com/thebookofscience/items/p1901b.html)
1901: Heterodyne - The book of science

In 1901, Reginald Fessenden invented heterodyning for combining frequencies, the basis of AM radio transmission.

amiloradovskyApr 24, 2024
Optical #Heterodyne Detection

https://www.rp-photonics.com/optical_heterodyne_detection.html
Stereophonic

GeekProjects NewsJul 14, 2023
Listening to Bats As They Search For Food https://hackaday.com/2023/07/14/listening-to-bats-as-they-search-for-food/ #timeexpansion #RaspberryPi #batdetector #raspberrypi #heterodyne #ultrasonic #op-amp #sound #pico #bat
Listening To Bats As They Search For Food

The range of human hearing goes up to about 20 kilohertz, which is fine for our purposes, but is pretty poor compared to plenty of other animal species. Dogs famously can hear up to about 60 kHz, a…

Hackaday