Patent ID: 6016352
Filing Date: 2000-01-18
Classification: H03G

Abstract:
A muting circuit comprising:a switching device having an enable input and being adapted to be coupled between an audio output and ground, the switching device being on when the enable input is at a deenergized voltage level; anda mute controller coupled to receive a mute signal and provide a signal to the enable input of the switching device to bias the switching device on, the mute controller including:an open collector buffer having an input and output, the input being coupled to receive the mute signal,a transistor having an enable input, the transistor coupled between ground and the enable input of the switching device,a first resistor coupled between a first voltage source and the enable input of the switching device,a second resistor coupled between the output of the open collector buffer and the enable input of the transistor,a third resistor coupled between the enable input of the transistor and a second voltage source, anda fourth resistor coupled between the output of the open collector buffer and a third voltage source.