contribution of information to any media and most especially to digital media for an end-user / audience in specific contexts
a device used for mixing together different sound or picture signals in order to produce a single sound or picture
a piece of equipment that changes electrical signals into sound, used in public places for announcing things, playing music, etc.
a device that is used for recording sounds or for making your voice louder when you are speaking or singing to an audience
an electrical device or piece of equipment that makes sounds or radio signals louder