Priority interrupt circuit
OwnerEdwin F. Rogersinventor
Life of this patent
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Abstract
A priority interrupt circuit for inhibiting the supply of signals from a first audio signal source to an electroacoustic transducer and substituting therefore signals from a second audio signal source in response to the occurrence of signals from the second source and despite the continued availability of signals from the first source is disclosed having the further capability of effecting the substitution of the second source for the first source when a radio frequency transmitter is enabled.
Claims11
A priority interrupt system comprising:
- at least one electroacoustic transducer;
- a first audio signal source for supplying audio frequency signals to the transducer;
- a second audio signal source;
- means for monitoring the second audio signal source for the presence of any audio frequency signals, the means for monitoring including a capacitor and diode means coupled to the second audio signal source for charging the capacitor when audio frequency signals are present;
- means responsive to detection by the monitoring means of an audio frequency signal to diminish the magnitude of audio frequency signals supplied to the transducer from the first audio signal source, the responsive means responding to the voltage on the capacitor exceeding a specified value, the responsive means further comprising a resistor connected in parallel with the capacitor to slowly discharge the capacitor to thereby disable the responsive means and reestablish the undiminished supply of audio frequency signals from the first source to the transducer in the absence of audio frequency signals from the second source for a predetermined time interval;
- and
- a radio frequency transmitter, the means for monitoring further adapted to sense signals from the radio frequency transmitter and to cause the said capacitor to charge and the said responsive means to diminish the magnitude of audio frequency signals supplied to the transducer from the first audio signal source when radio frequency signals are detected.
In a system including a radio frequency transmitter, an electroacoustic transducer, and an audio signal source for supplying audio frequency signals to the transducer, the improvement comprising:
- means monitoring the transmitter for the presence of radio frequency output signals, the means for monitoring including a capacitor, and diode means coupled between the radio frequency transmitter and the capacitor for charging the capacitor when the radio frequency transmitter is producing radio frequency output signals;
- means coupled to the monitoring means and operable when enabled thereby to diminish the magnitude of the audio frequency signals supplied to the transducer;
- and
- an intermittent audio frequency signal source, radio frequency choke means coupling the diode means to the intermittent audio frequency signal source whereby the occurence of an audio frequency signal will also diminish the magnitude of the audio frequency signals supplied from the audio signal source to the transducer, the radio frequency choke means preventing the loading of the radio frequency transmitter output by the intermittent audio frequency signal source.
A priority interrupt circuit for first and second audio signal sources and a radio frequency transmitter comprising:
- first means for normally coupling the first audio signal source to an electroacoustic transducer;
- second means for monitoring the second audio signal source and the radio frequency transmitter for the presence of respective audio frequency signals and radio frequency signals;
- and
- means responsive to the sensing of the presence of a respective signal by the second means for controlling the first means to uncouple the first audio signal source from the transducer.
Dependencies are inferred from the claim text.