Patent ID: 7557650

Claim:
An electronic generator supplying at least one first output signal with a cyclic ratio modulated at a base frequency to supply power to an audio transducer, comprising: at least a first formatting circuit with one input receiving a first input signal, and one output producing a first intermediate signal with a cyclic ratio modulated at the base frequency; and at least a first class D amplifier powered with a power supply voltage connected to the output from the first formatting circuit, and outputting a signal as the first generator output signal varying as a function of the first intermediate signal and with an amplitude that varies with the power supply voltage, said first formatting circuit comprising at least one integrator generating an integration signal and a comparator generating the first intermediate signal by comparison of the integration signal with a reference signal, wherein the integrator integrates the difference between two composite signals, wherein one of the composite signals is composed of first input and output signals weighted by corresponding amplification factors for which the ratio corresponds to a first gain, wherein the other composite signal is composed of a first offset voltage equal to half of the maximum amplitude of the first input signal, and a second offset voltage equal to half of the power supply voltage, these offset voltages being weighted by corresponding amplification factors with a ratio corresponding to the first gain, and wherein the average value of the reference signal output to the comparator is equal to half of the power supply voltage.