Relaciones entre ansiedad social y rasgos, estilos y trastornos de la ... by Caballo, Vicente E.; Salazar, Isabel C.; Irurtia, Maria Jesus; Benito Arias; Guillen, Jose Luis / Behavioral Psychology/Psicologia Conductual.
Dictaphone was prominent in the provision of multi-channel recorders, used extensively in the emergency services to record emergency telephone calls (to numbers such as 911, 999, 112) and subsequent conversations.
Headphones (or head-phones in the early days of telephony and radio) are a pair of small electronic or electric listening devices that are designed to be worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound in the user's ear.