Acoustic Channel

Acoustic Channel

 

a combination of equipment and physical media for the transmission of signals by means of audio and ultrasonic phenomena. In an acoustic channel for control or inspection purposes the signals employed are either the passive type—acoustic phenomena produced by the process (usually technological) under inspection—or the active type, which are specially generated. Passive signal acoustic channels are used in industry to check the noise characteristics of manufactured products (for instance, to inspect the quality of assemblies containing gearing); in medicine they are used to study sound from an organism. Active signals in the audio or ultrasonic range are used to transmit information, make remote measurements, determine the parameters of a medium, and detect certain undesirable impurities.

References in periodicals archive ?
The novice underwater acoustic channel model was illustrated in [8].
Furthermore, GEDAR is opportunistic routing aiming to mitigate the effects of the acoustic channel.
GEDAR uses opportunistic routing to deal with underwater acoustic channel characteristics.
The erroneous acoustic channel faces the problem of temporary path losses, high bit error rate, small bandwidth and large propagation delays.
The sensor nodes on each of the layers would communicate by way of an acoustic channel.
The acoustic channel is sporadic, in regards to connectivity, and only small bandwidths are available; therefore, sensor nodes are better off if they cache their sensed data.
argue that emotional facial expressions are during the actual production of emotional song, and in the perception, planning, and post-production of emotional song: facial expressions of emotion supplement the acoustic channel of music, and can linger beyond the acoustic dimension of music.
The anti-noise signal y(n) can be modified by the secondary-path function H(z) in the acoustic channel from y(n) to e(n), in this same way as the primary noise signal x(n) is modified by the primary path P(z) from the noise source to the error signal sensor.
For one-to-one acoustic data telemetry, focus is on achieving the highest data rate using phase-coherent acoustic communication techniques over a given bandwidth and a given set of acoustic channel conditions.
Teachers of people who are hearing impaired are trained to use the acoustic channel and view signing as an obstacle to the integration of deaf people into mainstream Hungarian society.
Sampling rates up to approximately 4 GHz may be achieved by dividing the acoustic channel into as many as 10 subchannels, each with a slightly different sample time.
After a chapter on fixed-to-mobile cellular radio channel modeling, the book then covers typical mobile-to-mobile communication scenarios:vehicle-to-vehicle, air-to-ground, and underwater vehicle-to-underwater vehicle acoustic channels.