Tuned Sound localization
September 3, 2010
I've been thinking about the problem of detecting the direction of a sound source in an environment where there may be multiple sources and I have what might be an outline of an idea for accomplishing that without too much computing power.
I was looking at the MSGEQ7 Seven Band Graphic Equalizer. It has one input and a multiplexed output that produces a voltage that is dependent upon the signal level that is in a given band. so i was thinking about what would happen if i used two of these chips that were using the same clock and were fed by two microphones that were physically offset. if i then sent the output to two separate comparator circuits that compared the output to a reference call it trigger voltage I would have a signal from each channel that begins when the threshold is met i could send this signal to a latch that latches on one signal and resets on the second. then send that to a RC circuit that charges the cap for the duration of the time that the latch is active if i took a measurement of the voltage across the cap when the latch is reset i could then use the time constant of the rc circuit to calculate the time between channels receiving a given sound in a given band.
I know i glossed over a bunch of details (like what if the band is reading after the sounds on both channels are at the threshold level then the time between latch and reset would be almost zero) but what i'd like to know is could this basic setup actually work.
is there a theoretical problem with the entire idea am i entirely misunderstanding the problem domain?