| 摘要 |
PURPOSE: A self-diagnosis display apparatus of a digital amplifier for broadcasting is provided to use a diagnostic signal in an inaudible frequency band, thereby examining the amplification performance of an amplification part. CONSTITUTION: A small micro control unit(20) is used for digital control of a power amplifier. The small micro control unit performs intellectual judgment, analysis, processing, and displaying functions by controlling a power amplifier control function with a digital method. A oscillation part(31) outputs a 23kHz oscillation signal. The oscillation part outputs a diagnostic signal according to control of the micro control unit. A mixer(32) mixes the output of the oscillation part and audio signal of an audio signal generating part. A speaker(70) is connected to an output terminal of an amplification part(11) through a relay(12) as a medium. |
