Multimode oscillator comprising at least: - a resonator including: • at least one moving element; • actuation means (18, 20) able to make the moving element resonate according to at least two resonance modes of which one is symmetric and the other is antisymmetric; • several detectors (22, 24, 26, 28) of the displacement of the moving element each comprising at least one electrical parameter of which the value varies as a function of the displacement of the moving element and coupled to the moving element such that they induce, in at least first and second output signals of the resonator representative of the variations in said electrical parameter, phase differences such that φ E1 - φ O1 ≠ φ E2 - φ O2, with φ E1 the phase of a first frequential component of the first output signal linked to a first of the resonance modes, φ O1 the phase of a first frequential component of the second output signal linked to the first of the resonance modes, φ E2 the phase of a second frequential component of the first output signal linked to a second of the resonance modes, and φ O2 the phase of a second frequential component of the second output signal linked to the second of the resonance modes; - polarization means (101, 116, 124, 130, 132, 134, 136) able to apply to the detectors electric polarization signals; - a first calculator able to carry out at least one first operation between the first and second output signals conserving the first frequential components of the first and second output signals and cancelling the second frequential components of the first and second output signals; - a second calculator able to carry out at least one second operation between the first and second output signals conserving the second frequential components of the first and second output signals and cancelling the first frequential components of the first and second output signals; and in which the resonator and the first and second calculators (102, 108) form part of at least two self-oscillating loops able to make the resonator resonate simultaneously in the two resonance modes, wherein the first calculator belongs to a first of the two self-oscillating loops able to make the resonator resonate in a first of the two resonance modes, and the second calculator belongs to a second of the two self-oscillating loops able to make the resonator resonate in a second of the two resonance modes. - a resonator including: • at least one moving element; • actuation means (18, 20) able to make the moving element resonate according to at least two resonance modes of which one is symmetric and the other is antisymmetric; • several detectors (22, 24, 26, 28) of the displacement of the moving element each comprising at least one electrical parameter of which the value varies as a function of the displacement of the moving element and coupled to the moving element such that they induce, in at least first and second output signals of the resonator representative of the variations in said electrical parameter, phase differences such that φ E1 - φ O1 ≠ φ E2 - φ O2, with φ E1 the phase of a first frequential component of the first output signal linked to a first of the resonance modes, φ O1 the phase of a first frequential component of the second output signal linked to the first of the resonance modes, φ E2 the phase of a second frequential component of the first output signal linked to a second of the resonance modes, and φ O2 the phase of a second frequential component of the second output signal linked to the second of the resonance modes; • at least one moving element; • actuation means (18, 20) able to make the moving element resonate according to at least two resonance modes of which one is symmetric and the other is antisymmetric; • several detectors (22, 24, 26, 28) of the displacement of the moving element each comprising at least one electrical parameter of which the value varies as a function of the displacement of the moving element and coupled to the moving element such that they induce, in at least first and second output signals of the resonator representative of the variations in said electrical parameter, phase differences such that φ E1 - φ O1 ≠ φ E2 - φ O2, with φ E1 the phase of a first frequential component of the first output signal linked to a first of the resonance modes, φ O1 the phase of a first frequential component of the second output signal linked to the first of the resonance modes, φ E2 the phase of a second frequential component of the first output signal linked to a second of the resonance modes, and φ O2 the phase of a second frequential component of the second output signal linked to the second of the resonance modes; - polarization means (101, 116, 124, 130, 132, 134, 136) able to apply to the detectors electric polarization signals; - a first calculator able to carry out at least one first operation between the first and second output signals conserving the first frequential components of the first and second output signals and cancelling the second frequential components of the first and second output signals; - a second calculator able to carry out at least one second operation between the first and second output signals conserving the second frequential components of the first and second output signals and cancelling the first frequential components of the first and second output signals;