A LabVIEW (National Instruments, Texas, USA) program controls the movement of stages, dictates the frequencies sent to the piezoelectric actuator and performs analysis of the signals acquired by the PSD.
This asymmetric oscillation produces a returning signal containing harmonics [ 3], which are US signals with frequency peaks at multiple of the original insonation frequencies sent by the machine probe [ 1].
The water-resistant wireless speaker tunes itself automatically with phase-loop circuitry that transmits on a 900MHz frequency sending a signal up to 150 feet.
The device consists of two main parts built with low cost commercial electronic components (hardware costs can be less than €100): (a) a RF radio transmitter fixed on an implement that, on the 868 MHz frequency, sends a univocal numeric code at predefined time intervals for every machine monitored; and (b) a receiver (integrated into the FDL), positioned on the tractor.
Hollywood in general has come calling with increasing frequency, sending its best seasonal product - and, often, the filmmakers and stars - to be showcased at DIFF.
Each chip can be activated by a hand-held scanner, but competing companies use different frequencies to send signals.
The Mesh works a lot like the original goTenna, which pairs to your phone using Bluetooth, then uses walkie-talkie radio frequencies to send text communications (no cell network necessary) to another device paired to someone else's phone — perhaps a mile or two away.
Since the Remote Wonder uses radio frequency to send its signal, the controller is not bound by the line-of-sight rule that limits regular infrared remotes.
A key component of email marketing is finding the right frequency to send your newsletter.
In 1931, a major improvement in playback fidelity was introduced: three-way speaker systems in which sound was separated into low, medium, and high frequencies and sent respectively to a large bass "woofer", a midrange driver, and a treble "tweeter".
