Abstract: An audio signal processing apparatus comprises at least one controllable element 90, 91, 92 for performing an analogue audio processing function. The controllable element is operable with a digital controller 58 that controls the analogue audio processing function performed by the controllable element 90, 91, 92. At least one audio processing module 52, 54 comprises a partial audio processing circuit for an audio processing operation. The module 52, 54 is operable with the controllable element 90, 91, 92 to complete the audio processing circuit and thus to enable the audio processing operation. In this way the audio processing operation is controllable by the digital controller. A switching array 96 selectively couples audio processing modules 52, 54 and the controllable elements 90, 91, 92. A power supply 66 is operable to supply power selectively for audio processing circuit of the or each module 52, 54.

Abstract: There is disclosed a method and apparatus for controlling an internal temperature of a fuel cell system. The method and system includes measuring a burner temperature of the high temperature fuel cell system comprising a fuel cell stack and a burner, the fuel cell stack comprising at least one fuel cell. The method further includes comparing the measured burner temperature with a predetermined burner temperature set point to identify a burner temperature difference between the measured burner temperature and the predetermined burner temperature set point and controlling an amount of oxidant supplied to the burner to decrease or increase the amount of oxidant supplied to the burner to thereby reduce the burner temperature difference and control a fuel cell stack inlet temperature.