The control system for QFA filter.
The response of tunable Helmholtz resonator to fast frequency sweep from 200 to for .
The response of tunable Helmholtz resonator to instant frequency hop from 200 to .
Draft drawing of the tuning mechanism of organ pipe sound projector, the linear actuator is not shown.
Resonant organ pipe equivalent circuit.
The sound pressure level of a tunable resonator tube for different positions of a movable sleeve; the difference between any two displacements is .
(a) The transient response for a frequency hop from 200 to at time moment . (b) The transient response of a tunable organ pipe for a frequency hop from 200 to at time moment , large time scale. (c) The tunable organ pipe frequency sweeping from 200 to for .
Low frequency deepwater sound source in the SCRIPPS testing pool.
The efficiency of sound source vs frequency in an isotropic approximation.
Spectrogram for 135, 10, and sweep over bandwidth.
(Color online) Correlation function for 135, 10, and , frequency sweep. Seneca Lake Sonar Test Facility, 3 May 2004.
Piezoelectric-driver and resonator-tube parameters.
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