04933915 is referenced by 23 patents and cites 3 patents.

In a method of indicating the time of an acoustic pulse at the transmission or reception of the same, the acoustic pulse is a wave package, the amplitude envelope of which having an ascending and a descending flank. The method is characterized in that the beginning of the descending flank of the amplitude is detected for determining of a reference time in the wave package, that a predetermined zero crossing in the wave package is identified from the reference time and that the time of the identified zero crossing is determined. A device for carrying out the method and for use in an acoustic system (1) comprising means (3) for generating of an electric signal (E1, E2) corresponding the acoustic pulse (P1, P2) is characterized by first means (9) arranged to detect the beginning of the descending flank of the electric signal for determining of the reference time of the wave package and to generate a trigger signal (C) corresponding to the reference time, and second means (10) arranged to respond to the trigger signal (C) for identifying the predetermined zero crossing in the wave package and to generate a time signal (D) corresponding to the identified zero crossing (D).

Title
Method of indicating the time of an acoustic pulse and a device for carrying out the method
Application Number
7/335540
Publication Number
4933915
Application Date
March 15, 1989
Publication Date
June 12, 1990
Inventor
Jan I Bostrom
Nordhemsgatan 49, S-413 06 Goteborg
SE
Agent
Merchant Gould Smith Edell Welter & Schmidt
IPC
G01S 15/00
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