Webtagr - Technology News Summarizer

Popular：

Virtualization DNS security formal verification reachability analysis compiler errors macro conflict web extension development framework Bitmap Graphics API inconsistencies All Tags

Listening to the Baltic States' Grid Switch with an Audio Cable

2025-07-12

Over the weekend of February 8th, 2025, the Baltic states' electricity grid switched from the Russian grid to the continental European grid. The author, inspired by a curious idea, used a PC's audio input and a simple audio cable as a makeshift sensor. By employing an FFT algorithm to analyze the 50Hz frequency component in the audio signal, they successfully monitored the grid synchronization process. Despite the unconventional approach, the results were surprisingly accurate, closely matching professional monitoring data, demonstrating a creative solution to a unique problem.

Secret Ultrasound Communication: Sending Data with Your Phone's Mic and Speaker

2025-06-28

This article details a fun method for transmitting data using ultrasound. The author cleverly encodes data into an ultrasonic signal, enabling short-range communication between devices using a phone's microphone and speaker. While the method has limitations like poor interference resistance and slow speed, it demonstrates the possibility of unconventional communication using everyday devices and sparks thought about its potential in practical applications, such as assisting meeting software in identifying nearby devices.