Device for generating a control signal for an electrical system

1. A device for generating a control signal for an electrical system, the device comprising:

an input for an input signal originating from the electrical system, the input signal being an analog signal representative of a voltage, of a current, respectively,

an output for the control signal, the control signal being an analog signal representative of a current, of a voltage, respectively, the control signal having a first component and a second component,

an analog block connected to the input and to the output of the device, the analog block comprising an electrical circuit comprising a passive analog component having a first passive characteristic impedance, a voltage, current, respectively, a measuring component and a current, voltage, respectively, generator,

a digital block comprising at least one digitally controllable component,

an analog-digital converter connected between the analog block and the digital block, and

a digital-analog converter connected between the analog block and the digital block,

the passive analog component of the electrical circuit being configured so as to generate the first component of the control signal and the generator of the electrical circuit being configured so as to generate the second component of the control signal, the electrical circuit being configured so as to sum the first and the second component that are generated in order to obtain the control signal,

the analog-digital converter being configured to convert, into digital, a measurement of the input signal done by the measuring component of the analog block to obtain a converted input signal,

the controllable component of the digital block being configured to generate a digital output signal as a function of the converted input signal and a model of a digital controller connected to a passive digital component having a second passive characteristic impedance, the value of the second characteristic impedance being chosen as a function of the value of the first characteristic impedance,

the digital-analog converter being configured to convert, into analog, the digital output signal to obtain a control of the generator, the second component of the control signal generated by the generator being a function of the control obtained from the digital block.

2. The device according to claim 1 , wherein the passive analog component and the passive digital component are of the same nature.

3. The device according to claim 1 , wherein each of the passive analog component and the passive digital component is a resistance.

4. The device according to claim 1 , wherein:

when the input signal is representative of a voltage and the control signal is representative of a current, the second characteristic impedance is greater than or equal to the first characteristic impedance, and

when the input signal is representative of a current and the control signal is representative of a voltage, the second characteristic impedance is less than or equal to the first characteristic impedance.

5. The device according to claim 1 , wherein:

when the input signal is representative of a voltage and the control signal is representative of a current, the measuring component is a voltage measuring component and the generator is a current generator, the passive analog component being connected in parallel with the input and the output and in parallel with the generator and the measuring component, and

when the input signal is representative of a current and the control signal is representative of a voltage, the measuring component is a current measuring component and the generator is a voltage generator, the passive analog component being connected in series with the generator and the measuring component between the input and the output.

6. The device according to claim 1 , wherein:

when the input signal is representative of a voltage and the control signal is representative of a current, the model is a model of the digital controller connected in series with the passive digital component, and

when the input signal is representative of a current and the control signal is representative of a voltage, the model is a model of the digital controller connected in parallel with the passive digital component.

7. The device according to claim 1 , wherein the controllable component is configured to:

convert the converted input signal originating from the analog-digital converter into a first intermediate signal representative of a power wave, as a function of the second characteristic impedance,

convert the first intermediate signal into a second intermediate signal representative of a voltage, of a current, respectively, as a function of the second characteristic impedance,

calculate a third intermediate signal as a function of the second intermediate signal and of the model,

convert the third intermediate signal into a fourth intermediate signal representative of a power wave, as a function of the second characteristic impedance, and

convert the fourth intermediate signal into the digital output signal of the controllable component as a function of the second characteristic impedance, the fourth intermediate signal being representative of a voltage, of a current, respectively.

8. The device according to claim 7 , wherein the controllable component is chosen from the group consisting of: a microprocessor, a digital signal processor, a microcontroller and an array of programmable gates.

9. An audio system comprising a device according to claim 1 .

10. The audio system of claim 9 , wherein the audio system is a speaker.

11. A method for generating a control signal for an electrical system from a device according to claim 1 , the method comprising:

receiving an input signal originating from the electrical system at the input of the device, the input signal being an analog signal representative of a voltage, of a current, respectively,

converting, into digital, a measurement of the input signal done by the measuring component of the analog block to obtain a converted input signal,

generating a digital output signal via the controllable component of the digital block,

converting, into analog, the digital output signal to obtain control of the generator of the electrical circuit,

generating the first component of the control signal via the passive analog component of the electrical circuit,

generating the second component of the control signal via the generator of the electrical circuit as a function of the control obtained from the digital block, and

summing the first component and the second component generated by the electrical circuit to obtain the control signal.