Nxp B.v.

Goodix Technology (Hk) Company Limited

Lûtsen Ludgerus Albertus Hendrikus Dooper

Marco Berkhout

Han Martijn Schuurmans

Maarten Van Dommelen

Maarten Wilhelmus Henricus Marie Van Dommelen

An audio amplifier system is described comprising: a variable gain audio processor for processing digital audio signal, a digital to analog converter coupled to the audio processor, and configured to receive the processed digital audio signal, a variable gain amplifier having an input coupled to the output of the digital to analog converter and operably connected to a power supply, a controller coupled to the variable gain audio processor and the variable gain amplifier and configured to switch the audio amplifier system between a first operating mode having a first power supply voltage value and a second operating mode having a second higher power supply voltage value; wherein the controller is operable in the first operating mode to set the audio amplifier system gain to a desired gain value and in the second operating mode to maintain the desired gain value.

Audio amplifier system

A pulse density modulation, PDM, driver, outputs a PDM stream and can be switched to a control token. The switch takes place when the first integral of the PDM stream has a magnitude less than or equal to a first predetermined value and the second integral of the PDM stream has a magnitude less than or equal to a second predetermined value.

Growing community of inventors

Brummen, Netherlands

Lûtsen Ludgerus Albertus Hendrikus Dooper