G - Physics – 01 – V
Patent
G - Physics
01
V
349/24
G01V 13/00 (2006.01) G01H 3/00 (2006.01) H04R 29/00 (2006.01)
Patent
CA 1198805
TITLE: DETERMINATION OF SYSTEM RESPONSE ABSTRACT OF THE DISCLOSURE Determination of the impulse response of a system such as a hydrophone is determined by generating a broad band reproducible test signal which after propagation is received and a replica of the broad band test signal is produced; either the received signal is compensated for fluctuations in propagation time of the test signal through the system and cross correlation of the compensated signal with the non-compensated signal is effected to derive the system response. A secondary signal may be used with the broad band test signal whereby the Doppler shift of the secondary signal can be utilised to determine the required compensation. Feed-back shift registers are disclosed for generating pseudo random noise for the test signal and the replica thereof. The invention permits calibration of a hydrophone in circumstances in which noise is present and variation in path length of the propagated test signal occurs.
409830
Commonwealth Of Australia (the)
Marks & Clerk
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