The use of class-B and class-D amlifiers for converting digital audio signals to analog signals is discussed. It is shown that the class-D amplifier is unsuitable due to distortion. Therefore, a new principle involving a switch-mode power supply and a class-B amplifier is suggested. By regulating the supply voltage to the amplifier according to the amplitude of the audio signal, a higher efficiency than can be obtained by the current principles is achieved. The regulation can be done very efficiently by generating the control signal to the power supply in advance of the audio signal, made possible by the digital signal from the preamplifier. A prototype shows possibilities for further developments.

Author: Jensen, Jørgen Arendt
Affiliation: Electronics Laboratory, Technical University of Denmark, Bldg. 344, DK-2800 Lyngby, Denmark
AES Convention: 80 (March 1986) Paper Number: 2346
Publication Date: March 1, 1986 Import into BibTeX
Subject: Audio Electronics
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=5084

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