1. Determining the loudest frequencies, then these are the resonance frequencies and will lead to the speed of sound because the length of the tube is related to the wavelength of the resonant frequencies.
2. The purpose of the Test is to compare the audio path gain of a system composed of an amplifier and loudspeaker but you can test also only a loudspeaker or earphone.
3. A teacher used this App to do an experiment in his class, he was able to find the speed of sound using a phone and a cardboard tube.
4. The phone generate a list of tones(frequencies), the signal is acquired from the microphone and the relative power is calculated for each frequency.
5. The Test is done at many different frequency so to produce the graph of the audio path response.
6. Please note that 0dB is an undetermined value so the measures are relative and not absolute values.
7. The tests are in the internal directory of the App to improve compatibility with Android 10 (Android/data/com. fbrlcu.
1. not sure how precise it really is, but looks good so far.I think the accuracy performance depend with your internal mic quality,i have tested it 20Hz-20KHz,and its not accurate lol But atleast it works,3 stars from me:/Very useful to test speaker response.
2. This pulses tones at specific Hz and it could read +13 or -0.6db with all Hz around it reading steady at +4db (you won't know that till it's set to read in 1Hz increments around each oddball result) so you can't just do 1 test and believe the results.
3. Where is the snapShot stored? Is it possible to export the snapShot?Very useful app but please update it so that the graph has a logarithmic scale when in log mode!Frequencies aren't even close to accurate.
4. Analog sweeps are the best way to plot output a smooth sound will give fluid plotsUseful to check the frequency response of headphones.
5. It will be good to be able to add delay before next frequency step to avoid echo from previous frequency being captured.Very nice app.
6. I have tested it against a few other apps that I have found to be working properly and this one is very close but does differ slightly in how it records the data.
7. Gives the user a lot of control.