SCBA low air alarm with improved voice clarity
Original Publication Date: 2010-Dec-31
Included in the Prior Art Database: 2010-Dec-31
I propose to keep the characteristic low air alarm sound, but make it dependent on inhalation and exhalation. The standard mechanical knock/bell would be used during inhalation (or not exhaling). This would provide the maximally annoying knock and would distort the codec when no-one is talking. Then, during exhalation or speech (which also requires exhalation) a lower repetition rate knock or no knock can be used, either of which will be much more acceptable to the local and radio voice communication. . This dual-rate alarm will improve radio and face-to-face verbal communication during critical time while the SCBA user is running out of air. This will result in safer operation and improved digital radio satisfaction. . This dual-rate alarm would also provide a second function of notifying other local and radio responders of the breath rate during low air--are they calm, panicking, hyperventilating, etc. If they are calm, others might be running out soon too and should be evacuated too. If they are panicking or disoriented and hyperventilating, they might need a more attentive evacuation.