I'm looking for a time sound real when system starts in a PDA?

Hi all!

I want to create a program that can be useful as a meter away. I have the PDA with microphone and speaker, so I can use it as sonar in the audible range.

The problem is when I try to find the point in time when my acoustic impulse starts ringing. It is very important to know the exact time of the impulse starts as it affects the quality of recognition reflected pulse.

If I use special functions such as 'Get System Time' or 'Ms timer value' I usually get incorrect results.

First my program starts to save, and then after the start of the pulse of 100 ms, then after 200 ms program will stop recording and saves the data.

I get RecStartTime, SndStartTime, so I can calculate how many data points in my record are before Pulse: (SndStartTime - RecStartTime) * 44, 1.

But I always find start impulse in my test folder much later.

So I don't think that "Mrs. timer value" can be used to know exactly the moment of time of sound starts (really starts).

How can I avoid this problem?

Thank you.

I'm not really sure that a Microphone and a speaker are sufficiently precise a method to measure the distance.  Perhaps you should consider a hobby ultrasonic sensor.  I used a lot of these things in College and it worked very well.

Tags: NI Hardware

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