Bad news for anyone who likes a quiet life. Nokia of Finland has filed a patent on a way to make cellphones ring even louder, or play digital music tracks without the user needing headphones (WO 2004/34733).
In addition to the usual small speaker, the phone body houses three cavities designed to resonate like organ pipes, amplifying the sound. At the front of the speaker is a small cavity that resonates at shorter wavelengths, while at the back of the speaker is a bigger cavity that resonates at longer wavelengths. Both these cavities are connected by tubes to a…
