Clean Audio for TV broadcast: An Object-Based Approach for Hearing-Impaired Viewers - April 2015
Audibility of a CD-Standard A/DA/A Loop Inserted into High-Resolution Audio Playback - September 2007
Sound Board: Food for Thought, Aesthetics in Orchestra Recording - April 2015
Scanning the Magnetic Field of Electro-Dynamic Transducers
The magnetic flux density in the magnetic gap and the geometry of the moving coil determine the force factor Bl which is an important parameter of the electro-dynamical transducer. The magnitude of the. The paper presents a new measurement technique for scanning the flux density B(z, ö) on a cylindrical surface using a Hall sensor and robotics changing the position of the sensor versus vertical position z and angle ö. The results derived from the scanning process reveal the real B field in the gap considering the fringe field and irregularities in the magnetization which may initiate a rocking mode and rubbing of the voice coil at higher amplitudes. Using the geometry of the coil the static force factor Bl(x, i=0) can be calculated as a function of voice coil displacement x and compared with the dynamic force factor B(x,i) measured by using a voice coil current i. Discrepancies between dynamic and static force factor characteristics are discussed and conclusions for loudspeaker design and manufacturing are derived.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.