Abstract: Multiple speakers and isobaric chambers are used to enhance sound quality in an earbud. The earbud has a housing with a sound outlet, a first and second isobaric chambers that are in communication with the outlet. Two sound drivers in the housing are positioned to emit sound waves into the isobaric chambers separately. A divider is used to guide sound waves by creating an elongated channel in the second isobaric chamber. An ear hook has a third isobaric chamber and a third sound driver positioned to emit sound wave into the third isobaric chamber. The third isobaric chamber is in communication with the outlet through the second isobaric chamber.

Abstract: A speaker system uses multiple sound chambers having phi ratios to create a dampening effect to filter out incoherent sounds, thus creating an enhanced listening experience that feels very natural to the listener. The speaker system has at least a sound driver, a first sound chamber having a first volume, and a second sound chamber having a second volume that is approximately 1.6 times the first volume. The speaker system can also have a second sound driver, and a third sound chamber having a third volume that is that is approximately 1.6 times the second volume.

Abstract: An automated passenger identification, passenger onboard counter and passenger inventory monitoring systems for maintaining a roster of passengers onboard a conveyance such as a school bus, train, or ship. The system comprises one or more transponders, each transponder embedded within identification means and each identification means assigned to and carried by one passenger. Each transponder has a unique identity code such that when a passenger is assigned an identity means there is created one to one relationship between the unique identity codes and passenger. The transponder in the identification means has an antenna embedded in the card for reception of an identity request via a transmitted radio frequency signal. In response to the identity query signal, the transponder transmits a response radio signal containing the unique identity code of the transponder thereby identifying the passenger.