The sigma-delta modulator comprises at least one resonator (110a,110b), an analogue-digital converter (120) converting an analogue signal from the resonator to a digital signal carrying temporal information, and a feedback loop (140) connecting the output of the converter to an excitation input of the resonator. At least one resonator is from the group comprising mechanical, acoustic, electromechanical, electrostatic, optical and chemical resonators. The resonator has the excitation input mechanical, optical or acoustic, and the feedback loop (140) is connected to the excitation input by the intermediary of an interface (112) which is electromechanical, electroacoustic, or electro-optical. The resonator is a free oscillator and comprises a feedback loop (160) connecting the output of the resonator to the excitation input of the resonator. The modulator comprises a control loop (170) connecting the output of the modulator to the excitation input of the resonator. A sigma-delta converter comprises the modulator and a band-pass filter (130) connected to the output (S) of the modulator. A device for analogue-digital conversion of a signal comprises an input (E) for analogue signal and the sigma-delta converter, where the input is connected to the excitation input of the resonator is a free oscillator. A device for measuring a physical quantity comprises a detection resonator sensitive to that quantity and the sigma-delta modulator which includes the detection resonator. The detection resonator is a free oscillator, or an excitation resonator is coupled to the detection resonator. The measuring device comprises a second sigma-delta modulator which includes the excitation resonator. The detection resonator is coupled to the excitation resonator by a physical quantity, which is in particular the Coriolis force. The sigma-delta modulator is utilized as an analogue-digital converter, a detector of a physical quantity, or a signal generator.
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