Hardware

Acoustic touch: Vision via sound for the blind

Australian researchers have developed cutting-edge technology known as "acoustic touch" that helps people "see" using sound. The technology has the potential to transform the lives of those who are blind or have low vision.

Business

Apple CEO Tim Cook makes surprise visit to China

Apple chief Tim Cook made a surprise visit to China this week, greeting gamers in the southwestern city of Chengdu as his company faces slumping phone sales in its biggest market.

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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