Method and system for detecting a predetermined sound event such as the sound of breaking glass
AssigneeHoneywell International Inc.
InventorKenneth G. Eskildsen
Life of this patent
Estimating the term…
Abstract
A method and system for detecting a predetermined sound event, such as the sound of breaking glass. Data representing monitored sounds is stored, such as in a circular buffer, while a preliminary assessment is made in real time as to whether the monitored sounds potentially include the predetermined sound event. If there is a potential correspondence, the already stored, pre-event data is frozen, and additional data including, and following, the event is stored. Next, the stored pre-event and additional data is retrieved from storage and provided to a processor that applies one or more algorithms to determine, with finality, if the event corresponds to the predetermined sound event.
Claims12
A glass breakage detector comprising:
- a microphone to convert incident audio signals to analog electrical signals;
- an analog band pass filter with an input coupled to the analog electrical signals, a filtered output therefrom is coupled to detection circuitry which emits as an output signal a varying direct current-type signal defined by tracking band-pass average voltage and band-pass average peak voltage of an output of the analog band pass filter;
- a comparator with a reference threshold coupled to a first input port of the comparator and with the output signal coupled to a second input port of the comparator wherein the comparator, responsive to the value of the outputs signal generates a trigger signal and
- enables storage of a plurality of samples of the analog electric signals;
- and
- circuitry, responsive to at least the stored plurality of samples to establish the presence of a glass breakage event.
A glass breakage detector comprising:
- a microphone;
- an integrated circuit with an analog input port coupled to the microphone;
- trigger circuits, carried by the integrated circuit and coupled to the analog input port, the trigger circuits establish a DC-type signal indicative of a glass breaking event;
- control circuits and storage circuits carried by the integrated circuit with the control circuits coupled to the DC-type signal indicative of the glass breaking event where the storage circuits receive and store both pre-trigger and post-trigger data;
- and
- processing circuits, coupled to a data output port of the integrated circuit to detect the presence of a glass breakage event in response to the stored data.
Dependencies are inferred from the claim text.