Patent ID: 6072883
Filing Date: 2000-06-06
Classification: H03G

Abstract:
An audio input adjusting circuit for a monitor having an audio amplifier for amplifying an audio signal, comprising:an input level adjusting section having an audio input terminal for receiving an input signal, a first output terminal outputting a first signal, and a second output terminal outputting a second signal having a lower level than the first signal;a converter coupled to the input level adjusting section and operable to convert the input signal into a DC signal;an integrator circuit, coupled to the converter for integrating the DC signal converted by the converter;a comparator coupled to the integrator circuit and operable to compare an output of the integrator circuit with a reference signal;a lock up circuit coupled to the comparator and operable to maintain at its output the logic state of an output of the comparator circuit; anda switching circuit coupled to the lock up circuit and operable to switch the input of the audio amplifier to either the first output terminal or the second output terminal of the input level adjusting section according to an output of the lock up circuit.