The emergency locator transmitter is a mostly self-contained device engineered both to survive most aircraft accidents and, when triggered by deceleration forces, to begin transmitting a "whoop, whoop" audio signal
(homing beacon) on 121.5 (and formerly on 243.0 MHz) MHz.
It welcomes every audio signal
found in today's broadcast plant.
The amplifiers in these and similar units use the Class-D topology (Figure 2), which is often likened to a switching power supply driven by an audio signal
instead of a reference voltage.
Comparing to the human visual system (HVS), the human auditory system (HAS) is more sensitive and easy to perceive subtle changes in the audio signal
. This is also why audio signal
processing is more difficult than image and video signals.
In the first stage, the audio signal
is processed with transposition cipher.
The innovation behind the patent includes a method that separates an audio signal
from a combined AV signal, and converts the audio signal
to text data.
* Recommendation International Telecommunication Union BS.1187-1,  along with the moving picture experts group proposed the testing methodology for checking the audio quality of the perceived audio signal
by means of two versions namely basic and advanced version.
The three key elements behind the engineering of the Sennheiser HE1 are superior analogue audio signal
processing minimising loss of data in transmission of signal and negatingdistortion in the final output.
is one of the most important signals in telecommunications, transmitting a great amount of information daily.
It supplies award-winning audio signal
processing and audio-visual test and measurement products for the cinema and pro AV industries.
By processing an audio signal
with Philips' echo cancellation, noise suppression, and/or beam-forming processors before passing it to Sensory's speech recognition engine, much of the unwanted ambient noise in signals can be filtered out, leaving the critical speech portion of the signals largely untouched.
To date, ClearOne said it has been awarded 66 patents and has an additional 34 patents in application covering innovations in five strategic categories of Audio Signal
Processing, Video Conferencing, Multimedia Network Streaming, Wireless and Industrial Design.