23rd International AES Conference
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SESSION 6: DSP IN LOUDSPEAKERS - PART 2


State of the Art Digital Pulse Modulated AmplifierSystem
Steen Munk and Kennet Skov Andersen
Bang & Olufsen A/S, Struer, Denmark


Pulse modulated amplifiers (PMS’s or Class D amplifiers) have won great interest during the past years. This is mainly because technology is now so advanced that such amplifiers simply have excellent performance! This paper describes advances made by Bang & Olufsen ICEpower a/s within PMA’s having pulse code modulated interface. ICEpower amplifiers use feedback loops to compensate for the nonideal characteristics of the power stage. This compensation, the PEDEC (pulse edge detection and error correction), is motivated. A new approach WPWM (Weighted PWM) gives an efficient approximation to NPWM. The paper gives a comparison of WPWM versus other modulation techniques. Last, the intelligent volume control (IVC) is introduced.