a signaling device that makes a buzzing sound
a machine for collecting low volume sounds and amplifying them, called parabolic reflector
an instrument used to visualize a sound wave, called phonoscope
an change the sound by electrical transaction in music electronic equipment which allows one to after the sound by elect
equipment used for adjusting the sound or picture of an electronic device, called a mixer
a device for amplifying or transmitting sound
a system that links audio and video equipment
an instrument for reproducing the musical sounds recorded on a phonograph record
a device that converts sound waves to an electrical signal
an instrument that synchronizes the screen and sound of a movie or television film