MULTICHANNEL REFLECTING DELAY LINE ON SURFACE ACOUSTIC WAVES AND METHOD OF ENCODING INFORMATION SIGNAL Russian patent published in 2016 - IPC G01S13/00 

FIELD: acoustics.

SUBSTANCE: in multichannel optical delay line (ODL) including input transducer located on a piezoelectric substrate and consisting of n interdigital transducers (IDT), and reflective elements arranged in one line on both sides of the input converter, an input transducer is made of N modules, consisting of n₁…n_i IDT, the number of which in the module matches the number of pulses with given time characteristics in the information signal and installed in a way that axial line of each module has its angle of inclination α to the line of reflective elements. Method of encoding information signal generated by multichannel ODL IDT of input converter are grouped in N modules, each module is made with the number of IDT corresponding to the number of pulses with given time delay and axial lines of which are installed at an angle of α₁…α_n to the line of reflecting elements, where α₁≠α₂≠…≠α_n, and recoding information signal is made by varying location of modules relative to each other preserving inclination angle of module axes.

EFFECT: technical result is improved protection of information signal from unauthorised reading and increased technological effectiveness of coding process.

2 cl, 4 dwg