I've been having a problem lately with my computer. It's running 64-bit Windows 7, and has two external hard drives plugged in.
Occasionally , I've noticed that sometimes when I attempt to do something in a program, even something as single as right-click on a cell in Excel, the computer will...
Or, you know, use AVRs for the products, since that's what the Arduino uses. I've breadboarded an ATmega328 before, it's not difficult at all. You wouldn't need to change any bit of the code, as I believe the Arduino code license allows it to be used in commercial products. The Arduino IDE even...
I don't do underwater acoustics work either, I'm actually studying electrical engineering. I'm currently writing a paper about electronic ultrasonic communication networks, which are primarily used underwater. I was thinking of using whale song as a sort of biological example to provide some...
Looks like the kind of thing I was looking for. Let me see if my calculations are right.
Starting with the 188 dB level I got, solving the following equation:
188 dB = 20\times log\left( \frac{P}{1μPa} \right)
I get P = 2.51 kPa @ 1 m for RMS wave pressure of the song.
Using formula 7-8...
Go with a Quadruple 2-Line to 1-Line Data Selector.
Connect your input string to the B inputs, and your "default" (0000) to the A inputs. This gives you the option of setting what you want your default to be if it might change.
If you want it as a fixed circuit and the 0000 has no chance...
Didn't the ultrasonic ones just have tuning forks? Or were there some with an actual transducer and a modulation scheme?
Morse code, by my understanding, isn't usually transmitted with sound as the carrier, usually radio or wire. Do you have a specific implementation in mind, or just as...
ADC, not DAC
I don't think that's going to help any.
Certainly looks better having discrete star-steps instead of linear interpolations between the data points. It doesn't look perfectly right on the values (the double-step on the left looks wrong), but you've got the basic idea now.
I'm doing a research paper about electronic wireless communication using sound. I've got a few reference regarding its use in underwater networks, networking within a body in a medical context, and one regarding communicating information through a steel wall (such as a sealed pressure vessel)...
Post your code, as well as how you are getting this number to begin with. Are you having it reported by Serial.println() to the Serial Monitor? Is this the output of your max function, or printed straight from analogRead() with no other processing?
Also, a basic drawing of how your ADC is...
Saw that. Problem is that the reference pressure level is 20 micropascals, which I understand is the standard for air measurements because it is considered the faintest sound a human can hear. The 188 dB level from wikipedia is based on 1 micropascal @ 1 meter, a different reference pressure.
I didn't think it would be this hard to find the answer to this, but 1 hour of googling has come up with nothing that I can make sense of. The main cause of my confusion is that there's about a dozen different ways of measuring sound power in decibels with different units or reference powers...
Do you have figures for your assertion? I tend to view such proclamations with skepticism.
Being the yungin that I am who has never even seen a vacuum tube in person, I can only speculate. However, I believe the main reason vacuum tubs went away is because of size, cost, high operating...