The card, which is energized by a rechargeable built-in battery, carries out contact and contactless transactions, as well as emitting an
acoustic signature.
In effect, the companies say, the device is recording about one second of ambient sound, hunting for the
acoustic signature of their wake words, "Alexa" or "OK Google," and then constantly overwriting and discarding that fraction of sound.
In order to accurately record its
acoustic signature, Dayeh had to know where the lightning would strike.
A v-shaped
acoustic signature for a perfect soundstage.
Part of this is down to reducing a submarines
acoustic signature, which can be done by modifying the shape of the hull, the design of the propulsion system, and the design of the control surfaces.
Blinded to information from respiratory gas analysis, the
acoustic signature was analyzed based on the first derivative of change in breathing frequency and sound intensity.
For conventional wings, the sound from the hard trailing edge typically dominates the
acoustic signature.
In addition to the smartphone, the system consists of an external sensor module about the size of a deck of cards that contains the microphones and the processing capability required to detect the
acoustic signature of gunshots, log their time and send that information to the smartphone by a Bluetooth connection.
However, determining a fault's
acoustic signature, implementing devices to measure sound waves, and analyzing the potential threat could prove expensive.
The new software based enhancement module brings together four methods of leak detection -- negative pressure wave monitoring for rupture events;
acoustic signature recognition of high pressure leaks; fast Distributed Temperature Gradient Sensing (DTGS); and ground heave strain monitoring -- into a single platform, providing a comprehensive leak detection system.
Combining a streamlined fuselage, the latest avionic equipment, a spacious cabin and low
acoustic signature, the AW139 sets new standard in the market.
The
acoustic signature of the petrol engine has also been enhanced, aided by 'Sound System' technology.
