Quickfilter Technologies. Inc. has released QuckfilterPro-4A Software, version 4.0. The software is used to design filters that will be implemented in Quickfilter's QF4A512 programmable signal converter IC. Version 4.0 provides users with an enhanced user interface, several new filter types, a free-form filter drawing tool and the ability to create inverse transfer functions with the click of one button. The user interface has been redesigned to have the same “look and feel” as the Quickfilter development tool for the QF1D512 simple and versatile FIR engine (SavFIRe™) chip, providing the user with a familiar format when designing for either device. This software tool provides system designers the ability to quickly and easily design complex filters without writing software, thus improving productivity and reducing time to market.