US 2026/0197097 A1Published application

Method and system for determining an operating frequency of an acoustic transmission system

OwnerNicolas GARRAUD, Esteban CABANILLASinventors

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Abstract

A method for determining an operating frequency of an acoustic transmission system includes a primary element and a secondary element arranged on either side of a wall, the primary element including a first electro-acoustic transducer for generating and detecting acoustic waves, the secondary element including a second electro-acoustic transducer and being configured to controllably change an electrical impedance across the terminals of the second transducer between an open-circuit state and a short-circuit state; wherein the operating frequency is determined from the change as a function of the frequency of the phase difference between an input impedance, on the primary element side, of an electric quadrupole modelling the assembly formed by the first and second acoustically coupled transducers, with the second transducer in a short circuit and in an open circuit. A system for carrying out such a method is also provided.

Claims14

Dependent claims

A method for determining an operating frequency of an acoustic transmission system (STA) comprising a primary element (EP) and a secondary element (ES), the primary element comprising a first electro-acoustic transducer (TA1) configured to generate acoustic waves (OA) of variable frequency in the direction of the secondary element through a wall (P) and to detect reflections of said acoustic waves by the secondary element, the secondary element (ES) comprising a second electro-acoustic transducer (T2) designed to convert said acoustic waves into an electric supply current, said secondary element being further configured to controllably change an electrical impedance across the terminals of said second transducer between an open-circuit state and a short-circuit state;

comprising the following steps:
a) emission of said acoustic waves (OA) from the primary element (EP) to the secondary element (ES), while keeping the second transducer (T2) in a short circuit;
b) simultaneously with step a), measurement of a first phase of the input impedance, on the primary element (EP) side, of an electric quadrupole modelling the assembly formed by the first (T1) and second (T2) acoustically coupled transducers, with the second transducer (T2) in a short circuit;
c) emission of said acoustic waves (OA) from the primary element (EP) to the secondary element (ES), while keeping the second transducer (T2) in an open circuit;
d) simultaneously with step c), measurement of a second phase of the input impedance, on the primary element (EP) side, of an electric quadrupole modelling the assembly formed by the first and second acoustically coupled transducers, with the second transducer (T2) in an open circuit;
e) calculation of the difference (Δφ) between the first and second phases;
said steps a) to e) being repeated for a plurality of frequencies sweeping an operating range of the acoustic transmission system;
and then
f) determination of said operating frequency as a function of said difference (Δφ) between the first and second phases calculated for said plurality of frequencies.

6 more elements

An acoustic transmission system comprising a primary element (EP) and a secondary element (ES), the primary element (EP) comprising a first electro-acoustic transducer (T1) configured to generate acoustic waves (OA) of variable frequency in the direction of the secondary element (ES) through a wall (P) and to detect reflections of said acoustic waves by the secondary element (ES), the secondary element (ES) comprising a second electro-acoustic transducer (T2) designed to convert said acoustic waves into an electric supply current, said secondary element being further configured to controllably change an electrical impedance across the terminals of said second transducer (T2) between an open-circuit state and a short-circuit state;

wherein the transmission system comprises a first control means (MCP) configured to control the primary element so as to, for a plurality of frequencies sweeping an operating range of the acoustic transmission system:
a) emit said acoustic waves from the primary element to the secondary element, while keeping the second transducer in a short circuit;
b) simultaneously with step a), measure a first phase of the input impedance, on the primary element side, of an electric quadrupole modelling the assembly formed by the first and second acoustically coupled transducers, with the second transducer in a short circuit;
c) emit said acoustic waves from the primary element to the secondary element, while keeping the second transducer in an open circuit;
d) simultaneously with step c), measure a second phase of the input impedance, on the primary element side, of an electric quadrupole modelling the assembly formed by the first and second acoustically coupled transducers, with the second transducer in an open circuit;
the control means also being configured to
e) calculate the difference between the first and second phases for each frequency of said plurality of frequencies;
and to
f) determine said operating frequency as a function of said difference between the first and second phases calculated for said plurality of frequencies.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/425,763Filed 18 Dec 2025
Priority: FR 241500520 Dec 2024
Published: 9 Jul 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04B 17/104
For measurement of specific parameters of the transmitter or components thereof: of other parameters, e.g. DC offset, delay or propagation times
H02J 50/15
Circuit arrangements or systems for wireless supply or distribution of electric power: using ultrasonic waves
H02J 50/80
Circuit arrangements or systems for wireless supply or distribution of electric power: involving the exchange of data, concerning supply or…
H04B 11/00
Transmission systems employing ultrasonic, sonic or infrasonic waves