#DOES THE SOUND OF A GUNSHOT ECHO PC#

Michael Gardi has added a new log for MCM/70 Reproduction.

Joel Kirchartz liked HF receive converter for RTL-SDRs and similar.

Ostracus on Tricking A Smart Meter Into Working On The Bench.

David on Replaceable Batteries Are Coming Back To Phones If The EU Gets Its Way.

aki009 on Building Your Own 80386DX ISA Single Board Microcomputer.

M on Building Your Own 80386DX ISA Single Board Microcomputer.

Gravis on REMOTICON 2021 // Hal Rodriguez And Sahrye Cohen Combine Couture And Circuitry.

jonmayo on Building Your Own 80386DX ISA Single Board Microcomputer.

Dan on Tricking A Smart Meter Into Working On The Bench.

ChatDansCiel on Tricking A Smart Meter Into Working On The Bench.

RedVader101010 on WhatвЂ™s That AccessUSB Menu In My LG SmartTV?.

Severe Tire Damage on Know Which Way The Wind Blows, Whether Weather Boosts Your Mood.

After a bit of math the end result would be an vector as to where the gun was shot, and a not so accurate (depending on the processing power and the dimensions of the microphone array, larger being better) The only problem with this setup as I would see it, is that you could tell the origin of the sphere, where the shooter took their shot, but you would be unable to tell where the shot was aimed, they could be shooting towards or away from you.

The first spike to arrive from a microphone in the FFT data would have the bullet direction narrowed down to 120 degrees ((360/6)x2 вЂ“ it could arrive at 2 mics at once). The sound wave of the impulse/bang from an ideal gun in 3D space (ignore all reflections/refractions of buildings and ground) would propagate as a sphere. The time of the 7 spikes would be know and the dimensions and the spacing of 7 microphones would also be known. But IвЂ™m sure that some kind of bullet fingerprinting could be done as well (sub-sonic or supersonic at a minimum). So i would guess that they would carry out a FFT on the 7 data streams and look for straight line spikes/impules (all frequencies at once вЂ“ that is the way I would think of the bang from a bullet). Looking down on it you would see a hexagonal pattern with the 7th microphone at the center. The 7 microphones look to be positioned within a sphere, 4 in the top hemisphere and 3 in the bottom. Posted in Arduino Hacks, digital audio hacks Tagged acoustic location, echo location, echolocation, microphone Post navigation

This brings to mind a homebrew sonar hack from way back. The ADC samples from each microphone via an NPN transistor which is used as a simple amplifier. The circuit noise created was just too great so he transitioned to using an Arduino. The stereo input only provides two channels so he tinkered around with a 555-based multiplexing circuit to sample from three.

#DOES THE SOUND OF A GUNSHOT ECHO PC#

He first tried using a PC sound card to collect the samples. The time difference from the three samples can be used to triangulate coordinates as seen in the image above. doesnвЂ™t need to generate the sound himself, he just needs to pick it up at different points. The most common example of echolocation is in Bats, who emit ultrasonic noise and listen for its return (echo) to judge the location of objects. The theory behind it is acoustic location, which is a specialized type echolocation.

When thinking of a way to quantify this belief he set out to build a triangulation system based on the sound of gunshots. Suspected that hunters were getting too near his house.

Does the sound of a gunshot echo