background: there is no information about the pattern of use of earphones and music players in iranian adolescents. the aim of this study was to assess the prevalence and pattern of the use of earphone and music player devices as a main risk factor for hearing loss in adolescents of tabriz city, northwest of iran. methods: in this cross‑sectional study in november 2011, 2,359 high school studen...

We have introduced a new gesture-detection technique that utilizes the interference of earphones on a magnetic pickup. This technique is advantageous because it can be easily applied to almost any type of electric guitar without cracking it, and it can be used as a gesture-based effect control system. This system utilizes a theoretically audible, but practically inaudible range (TAPIR) acoustic...

A prototype of a very high dynamic range 32bits Digital to Analog Converter (DAC) was designed and built for the purpose of direct auditory stimulus generation. It provides signals from less than 100 nV up to 50 Watts peak power output, driving a 32-Ohms earphone or speaker. The use of ternary cells makes possible a 170 dB dynamic range that is basically limited by thermal noise only.

1. Dried cicada bodies of the species Cyclochila australasiae and model cicadas made from a miniature earphone driving a plastic cavity were used to study the acoustics of sound production in male cicadas. 2. A model cicada with shape and dimensions similar to those of the abdomen of a male C. australasiae resonates at the natural song frequency of the species (4.3 kHz). The abdominal air sac o...