Patent Document ID: 9903842
Application ID: 14414263
Patent Flag: 1

Claim One:
1. A method for processing ultrasonic signals acquired by ultrasonic probing, comprising: controlling a plurality of emission transducers for L successive emissions of ultrasound waves to an area of interest; controlling N reception transducers to simultaneously receive and for a predetermined time, for each successive emission, N measurement signals, and measuring noisy echoes due to reflections of the emission in question in the area of interest; obtaining an array of ultrasonic time signals of size L×N, each coefficient K i,j (t) of the array representing the measurement signal received by the j-th reception transducer due to the i-th emission; transforming the time signal array into a frequency signal array; performing a singular value decomposition of the frequency signal array; denoising the ultrasonic time signal array by: removing some of singular values and associated singular vectors obtained from the singular value decomposition according to a predetermined criterion for distinguishing between singular values associated with defects and singular values associated with noise, the criterion being based on difference values, wherein each difference value is computed as a difference between successive amplitudes of singular values in a decreasing series of amplitudes of the singular values determined on the basis of the frequency signal array; reconstructing a denoised frequency signal array on the basis of unremoved singular values and singular vectors, and performing an inverse transform of the denoised frequency signal array into a denoised time signal array.