Sunday, October 2, 10:45 am — 12:15 pm (Rm 402AB)
This tutorial reports on the progress made in the development of a new IEC standard dedicated to electrical and mechanical measurements (part B) complementing the acoustical measurements (part A) presented at previous AES conventions. Both standards are applicable to all kinds of transducers, active and passive loudspeakers, and other sound reproduction systems. Voltage and current measured at the electrical terminals provide not only the electrical input impedance but also meaningful parameters of linear, nonlinear, and thermal models describing the behavior of the transducer in the small and large signal domain. This standard addresses long-term testing to assess power handling, heating process, product reliability, and climate impact. New mechanical characteristics are derived from laser scanning techniques that are the basis for modal analysis of cone vibration and predicting the acoustical output. The electrical and mechanical data are required for transducer and system design based on numerical simulations (FEA, BEA) and digital signal processing protecting the transducer and correcting the transfer behavior actively.