Electronics & Semiconductors

New compact chips can convert light into microwaves

The National Institute of Standards and Technology (NIST) and its collaborators have delivered a small but mighty advancement in timing technology: compact chips that seamlessly convert light into microwaves. This chip could ...

Electronics & Semiconductors

Research team develops insect-mimicking sensor to detect motion

The recent development of an intelligent sensor that mimics the optic nerve of insects while operating at ultra-high speeds and low power offers extensive expandability into various innovative technologies. This technology ...

Internet

Scientists develop a high-precision router

Your next router will know where you're sitting. A team of researchers from two Madrid universities—Polytechnic (UPM) and Carlos III (UC3M)—has developed a prototype router with high positioning accuracy that allows them ...

Energy & Green Tech

Tiny power converters that run on vibrational energy

University of California San Diego and CEA-Leti scientists have developed a ground-breaking piezoelectric-based DC-DC converter that unifies all power switches onto a single chip to increase power density. This new power ...

Security

Research describes new protocol for stopping network interlopers

Dr. Santosh Ganji, a recent computer engineering doctoral graduate, and Dr. P.R. Kumar, a professor in the Department of Electrical and Computer Engineering at Texas A&M University College of Engineering, work on the security ...

page 3 from 40

Telephone

The telephone (from the Greek: τῆλε, tēle, "far" and φωνή, phōnē, "voice") is a telecommunications device that transmits and receives sound, most commonly the human voice. It is one of the most common household appliances in the developed world, and has long been considered indispensable to business, industry and government. The word "telephone" has been adapted to many languages and is widely recognized around the world.

The device operates principally by converting sound waves into electrical signals, and electrical signals into sound waves. Such signals when conveyed through telephone networks — and often converted to electronic and/or optical signals — enable nearly every telephone user to communicate with nearly every other worldwide. Graphic symbols used to designate telephone service or phone-related information in print, signage, and other media include ℡, ☎, ☏, and ✆.

This text uses material from Wikipedia, licensed under CC BY-SA