Abstract: Disclosed is a class D amplifier comprising a modulation stage having a first input for receiving an input signal and an output for producing a modulated version of the input signal; a plurality of power stages, each power stage being responsive to said modulation stage and comprising a first switch and a second switch coupled in series between a first voltage source and a second voltage source, each power stage comprising an output node between the first switch and the second switch; and a power stage control circuit for measuring the input signal level and enabling a selected number of the power stages as a function of the measured input signal level. A method for controlling such a class D amplifier is also disclosed.

Abstract: The invention relates to a method and an electronic device especially for car audio entertainment including a car audio equipment (2) and an other electronic device (4) like a handheld including at least one data connection (5) and at least one control connection (3) between the car audio equipment and the other electronic device, whereby the car audio equipment is able to send data to the other electronic device which is able to respond to the data send by the car audio equipment by sending a data answer, wherein the car audio equipment is able to compare the data send and the data received and generates a control signal to allow the control of the other electronic device like the handheld by the car audio equipment.

Abstract: Disclosed is a class D amplifier comprising a modulation stage having a first input for receiving an input signal and an output for producing a modulated version of the input signal; a plurality of power stages, each power stage being responsive to said modulation stage and comprising a first switch and a second switch coupled in series between a first voltage source and a second voltage source, each power stage comprising an output node between the first switch and the second switch; and a power stage control circuit for measuring the input signal level and enabling a selected number of the power stages as a function of the measured input signal level. A method for controlling such a class D amplifier is also disclosed.

Abstract: The invention relates to a method and an electronic device especially for car audio entertainment including a car audio equipment (2) and an other electronic device (4) like a handheld including at least one data connection (5) and at least one control connection (3) between the car audio equipment and the other electronic device, whereby the car audio equipment is able to send data to the other electronic device which is able to respond to the data send by the car audio equipment by sending a data answer, wherein the car audio equipment is able to compare the data send and the data received and generates a control signal to allow the control of the other electronic device like the handheld by the car audio equipment.