US 12,425,184 B1
Computer-implemented method for determining a frequency content of an encrypted raw audio signal
Tu Duyen Nguyen, Neuilly-sur-Seine (FR); Adrien Lesage, Neuilly-sur-Seine (FR); Clotilde Cantini, Neuilly-sur-Seine (FR); and Rachid Riad, Neuilly-sur-Seine (FR)
Assigned to CALLYOPE, Neuilly-sur-Seine (FR)
Filed by CALLYOPE, Neuilly-sur-Seine (FR)
Filed on Nov. 8, 2024, as Appl. No. 18/941,347.
Int. Cl. H04L 9/00 (2022.01); G10L 15/08 (2006.01); G10L 19/002 (2013.01); G10L 19/032 (2013.01); G10L 25/18 (2013.01); G10L 25/24 (2013.01)
CPC H04L 9/008 (2013.01) [G10L 15/08 (2013.01); G10L 19/002 (2013.01); G10L 19/032 (2013.01); G10L 25/18 (2013.01); G10L 25/24 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A computer-implemented method for determining a frequency content of an encrypted raw audio signal obtained from a preliminary application of an encryption function E to a raw audio signal, said method comprising:
obtaining said encrypted raw audio signal;
obtaining at least one convolution kernel function, each convolution kernel function comprising K weights and corresponding to a couple composed of a temporal bin and a frequency bin;
quantizing said encrypted raw audio signal, so as to obtain a quantized input signal;
for each convolution kernel function among said at least one convolution kernel function, quantizing said K weights, so as to generate at least one quantized convolution kernel function;
compiling said at least one quantized convolution kernel function in a homomorphic encryption environment so as to obtain at least one private quantized kernel function;
applying said at least one private quantized kernel function to said quantized input signal so as to determine an encrypted frequency content comprising, for each couple of said temporal bin and said frequency bin, a Fourier transform at said frequency bin of a portion of said quantized input signal corresponding to a temporal window comprising said time bin; and
applying an inverse decryption function of said encryption function to said encrypted frequency content, so as to obtain said frequency content.