Example spectrograms showing the electric moped sounds and the imitations produced by Chinese Blackbirds. (A)–(B) Three examples of locking sound, unlocking sound, and alarms from three brands of ...

An example of a spectrogram, which scientists use to highlight sound sources based on their visual signatures. Credit must be given to the creator. Only noncommercial uses of the work are permitted.

Here’s an interesting use for an old organ. Let it get in on your Ham radio action. [Forrest Cook] is showing off his project which uses a Hammond Organ to encode messages which can be displayed by a ...