Siren Vote: Democracy In Action

How about considering a system that could warn more people using fewer units and less overall expenditure? I have a better alternative to the current warning sirens. It’s a system based on warning devices that can be heard from indoors and in moving vehicles at over two miles from the warning device. It also has a distinct sound unlike that of any siren. It is a system based on my patent 4686928. It has been widely published that the current sirens have a range of only slightly over a mile and were never intended to be audible from indoors. A system using my devices would require far fewer units to cover a given area and provide cities with better coverage for less money. A video of the original prototype test of my previous device tested in July, 1982 at the Cincinnati/Northern KY International Airport which led to my previous patent 4429656 can be found on Youtube by searching “toroidal whistle prototype test”. This device was audible from Delhi, OH. The later device is a full 10 dB louder than the prototype which measured 85 dB at 1 mile and 70 dB at 2.5 miles. This means 95 dB at 1 mile and 70 dB at up to 4 miles, terrain permitting. The loudest warning sirens today have a 70 dB radius of 11,000 feet. I would like for a manufacturer (hopefully from my home state of Kentucky) to build one of my Dynawhistles and test it in actual cities. I believe it would soon catch on, as unlike a siren of equal output, it would not sound unbearable to those within the first few hundred feet and would likewise be audible in areas and situations where no current siren would. For a frequency of 420 Hz using a 45” horn, my Dynawhistle (Patent 4686928) has an output of about 95 dB at 1 mile, 85 dB at 2 miles and a 70 dB radius of up to 4 miles. It measures 135 dB at 100 feet, but due to its frequency spectrum, it has an atmospheric absorption loss of less than 1 dB/1000 feet. Due to the lack of upper harmonics, it is also easier on nearby ears per rated dB. I feel it is the answer to the current problem of the public not being able to hear the warning from indoors.Most sirens produce a higher fundamental frequency with a wealth of upper harmonics. The atmospheric absorption loss of a typical current siren is over 2 dB/1000 feet. The sound is very loud and harsh to nearby ears, but it is very rare to see a 70 dB radius of even 2 miles on even the loudest current warning sirens. In addition to lower frequencies sounding mellower to the ear and carrying further, they also penetrate structures better than higher frequencies.