Abstract: A transmitter for recording of an electric signal from an acoustic drum having a vibration-sensitive device for attachment to the drumhead and for acquisition of undulations which has one of the following profiles: sector shape, sector shape with a tip turned toward the center of the drumhead, sector shape with concave sides and with a tip turned toward the center of the drumhead, circular shape with wart-like projection turned toward the center, elliptical shape with wart-like projection, which is arranged at radius of curvature one side large and is directed towards the center of the drumhead, or rectangular shape with wart-like projection which is arranged on a lateral edge of the rectangle and is directed towards the center of the drumhead.

Abstract: The invention relates to a transmitter for recording of an electric signal from an acoustic drum, with a vibration-sensitive device for attachment to the drumhead of the acoustic drum and for acquisition of undulations the vibration-sensitive device exhibits one of the following profiles: sector shape sector shape with a tip turned toward the center of the drumhead; sector shape with concave sides and with a tip turned toward the center of the drumhead; circular shape with wart-like projection turned toward the center; elliptical shape with wart-like projection, which is arranged at radius of curvature one side large and is directed towards the center of the drumhead; rectangular shape with wart-like projection, which is arranged on a lateral edge of the rectangle and is directed towards the center of the drumhead.

Abstract: A pickup amplifier system for a public address system including an amplifier, an amplifier box and a speaker simulator microphone wired between amplifier and amplifier box.The amplifier system is characterized by the following features:the speaker simulator is arranged in the area of the amplifier box, close by or on its front face; and,an acoustic pickup is arranged directly before on the front face of the amplifier box.