AUDIO SIGNAL PROCESSING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a music reproducing apparatus for mount on an airframe which utilizes a self-diagnostic request signal from an airframe system as automatic adjustment of an audio output level. SOLUTION: An audio signal processor includes: a communication circuit with respect to an airframe system; a recording apparatus having a level restriction signal; a microprocessor having an expected value of an audio output signal and instructing music reproduction to the recording apparatus on the basis of an instruction from the communication circuit; an audio circuit for applying D/A conversion to an audio signal outputted from the recording apparatus via an attenuator and thereafter providing an output of an audio output signal; and a means for applying A/D conversion to the audio output signal and thereafter detecting a maximum value and providing an output to the microprocessor, and the audio signal processor adjusts the attenuator so that the maximum value of the audio output signal is coincident with the expected value and utilizes the self-diagnostic request signal from the airframe system as an automatic adjustment instruction. COPYRIGHT: (C)2005,JPO&NCIPI