The October JASA Express Letters cover features a photo of a big brown bat provided by the authors of “Representation of frequency-modulated sweeps in the cochlear nucleus of the big brown bat,” by Andrea Megela Simmons, Michaela Warnecke, and James A. Simmons.

This month’s issue also included a few Editor’s Picks you don’t want to miss:

• “Higher-order mode filtering by a resistive layer,” by Svetlana Kuznetsova, Yves Aurégan, and Vincent Pagneux
• “Computation of spherical sector harmonics norm with application to blind source separation,” by Deepika Kumari and Lalan Kumar

Browse the rest of the issue at pubs.aip.org/asa/jel/issue/3/10.