Patent Review: A Different Concept Loudspeaker

In this article, James Croft reviews a generic “Loudspeaker” concept patent, granted to Teppei Yamada, of Tokyo, Japan, on behalf of Zorzo Co., Ltd. and which describes a somewhat surprising concept of a loudspeaker that includes a hermetically sealed enclosure, with a driver outside of an enclosure and a second driver inside, with a pipe communicating between the two drivers. The second driver is configured to output a signal of opposite phase to that of the first driver. This article was originally published in Voice Coil, October 2016.

In this article, James Croft looks at a patent awarded to David Russell (Toronto, CA); and John French (Caledon, East, CA) on behalf of Audera Acoustics, Inc., Schomberg CA. The patent describes a generic acoustic high displacement transducer system, containing a diaphragm position sensing module, a controller with a transmitter, so that the voice coil moves at least partially in response to the control signal.

Another edition of great interest to the loudspeaker engineering community, the October 2016 issue of Voice Coil highlights forthcoming speaker industry events and features an update on Integrated Amplifier/Signal Processing Speaker Vendors, including an indispensable Directory update. In this month’s Acoustic Patents, we look at two recent and promising - or simply intriguing - inventions, while Vance Dickason returns to Wavecor’s subwoofer range in this month’s Test Bench, which positively impressed him in past reviews. Now available.

audioXpress October 2016 is now available online and features two exciting reviews—one on the Bricasti Design M1 Dual Mono DAC - Deluxe Limited Edition and the other on the XiVero MusicScope file analysis software. We also report on this year’s 2016 Midwest Audiofest Speaker Design competition; Christopher Paul shares his Regulated Filament Supply project; and we talk about microphones with Matthew McGlynn, owner of Microphone-Parts. This and much more to read. Download your edition now.