APPARATUS AND METHOD WITH VOICE INTERFACE FOR DETERMINING DIRECTION OF SOURCE OF TONAL AUDIO SIGNAL BY DIVER Russian patent published in 2013 - IPC G01S3/80 

FIELD: physics.

SUBSTANCE: signal of a source is received at two nondirectional antennae, distance between which is equal to λ/4. The signal from the first antenna is transmitted to the input of an adder and the signal from the second antenna is successively delayed by a time from T/4 to 3T/4 and then transmitted to the second input of the adder. As a result of the summation of the signals at different positions of the switch, a set of root-mean-square values of the resultant signal is obtained. Inverse values are then calculated and the maximum of said values is selected. The number of the position of the switch corresponding to the maximum value of the inverse signal is determined, and the introduced delay is determined based on the obtained number. The introduced delay is then used to calculate the angle between the direction of arrival of the signal and the line which connects the centres of the antennae. The obtained angle is converted to voice form and signalled to the diver through headphones. The diver searches the direction where the value of the deviation angle becomes minimum in any plane, and then starts working in the plane which is orthogonal to the one selected before receiving the voice message "deviation is 0 degrees".

EFFECT: finding the direction of a signal in any direction, reducing the effect of interference on accuracy of direction finding, providing the diver with information in form of human speech, particularly information on the numerical value of the deviation angle.

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