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Excessive noise level alerting device

  • US 7,315,244 B2
  • Filed: 07/14/2004
  • Issued: 01/01/2008
  • Est. Priority Date: 07/14/2004
  • Status: Expired due to Fees
First Claim
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1. A sound-detection and alerting system, comprising:

  • a device for capturing acoustic energy and producing a representative electric signal;

    a filter for limiting a plurality of frequencies of the electric signal to predetermined frequency ranges;

    a comparator for comparing the representative electric signal to an established threshold signal and producing a corresponding comparator output signal;

    a smoothing rectifier for reducing oscillations in the comparator output signal and producing a smoothed output signal;

    a timer for determining whether the smoothed output signal is within a pre-determined voltage range for at least a pre-determined period of time and producing a notification-device activation signal; and

    a one-shot device for combining the notification-device activation signal with a frequency oscillator signal to produce an oscillating activation signal which activates a notification device.

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