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US 4,306,114 AGranted
Automatic audio mixing selector device
AssigneeSumma-Nova Corporation
InventorJeffery C. Callahan
Life of this patent
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Abstract
An automatic mixing selector device for use with an audio amplifier or tuner for automatic priority selection and digital fading of two or more audio sources using the amplifier and tuner controls. The circuit comprises a priority selector circuit which monitors the designated priority audio source for signal amplitude and duration, a micro-computer then operates a digital fader to phase in the priority signal and also to phase in the alternate signal in the absence of a sufficient priority signal.
Claims11
An automatic mixer selector device comprising:
- an audio signal selection switching circuit for selecting one of two audio input sources;
- a priority source input circuit operably connected to the audio switching circuit;
- an alternate source input circuit operably connected to the audio switching circuit;
- an audio output circuit operably connected to the audio switching circuit for outputting the selected audio signal;
- a signal attenuating means operably connected to the audio output circuit for selective fading of signals in and out;
- a sensor circuit operably connected to the priority source input circuit for detecting a signal thereat;
- and
- a computer processor operably connected to the audio switching circuit, the signal attenuating means and the sensor circuit;
- whereby upon detection of an audio signal present at the priority source input, said processor activates the signal attenuating means for fading out the alternate signal and actuates the signal selection switching circuit to connect the priority input to the audio output and upon loss of that signal, to switch out the priority input and fade in the alternate signal.
6 more elements
Dependencies are inferred from the claim text.