Electrical audio signal processing systems and devices – Including amplitude or volume control – Automatic
Patent
1997-12-01
2000-06-06
Lee, Ping
Electrical audio signal processing systems and devices
Including amplitude or volume control
Automatic
381 56, 381 58, H03G 300
Patent
active
060728833
ABSTRACT:
An audio input sensitivity adjusting circuit for a monitor which can properly adjust the audio input level even though an overinput signal is inputted from a sound card or a loudspeaker of a personal computer. The circuit includes an input sensitivity adjusting section for adjusting an input sensitivity of the audio signal by a predetermined level, a converter for converting the audio signal into a DC signal, an integrator circuit for integrating the DC signal outputted from the converter, a level adjusting section for comparing the DC signal integrated by the integrator circuit with a predetermined reference signal and outputting an input switching control signal as a result of comparison, a lock up circuit for maintaining the input switching control signal outputted from the level adjusting section in its outputted state, and a switching section for switching the audio signal inputted from the input sensitivity adjusting section to the pre-amplifier in accordance with the input switching control signal maintained by the lock up circuit.
REFERENCES:
patent: 4276604 (1981-06-01), Kitamura et al.
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