Audio control circuit for a computer system system having an energy-saving feature
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United States of America Patent
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Dec 15, 1998
Grant Date -
N/A
app pub date -
Aug 20, 1996
filing date -
Apr 18, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To allow sounds to be output by the audio amplifier of a multi-media computer system during periods of CPU inactivity and display screen blanking, a switch is added to the control circuit of the audio amplifier which overrides the energy-saving shut-down program which would normally be activated to cut-off power to both the monitor display screen and the audio amplifier. The switch is in the form of a transistor whose control electrode is connected to both the power supply and to the CPU, such that the transistor can be turned on either by a signal from the main power circuit or by a keyboard activated signal from the CPU's microprocessor, the collector of the transistor being connected to the audio input terminal of the audio amplifier.
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