I've got an HTC One X, on which I'm trying to record uncompressed WAV audio.
In particular, I'm interested in a 13.5 kHz sound. Other Android devices pick up that frequency easily, and so do iOS devices, but the HTC One X doesn't.
For example, the spectrogram below shows the same recording from the HTC One X (top) and an HTC One V (bottom), recorded with the same app (called Hertz, but any will do), with identical settings (mainly 44,100 Hz sampling rate).
Why is the One X not picking up the same?
- Is the microphone different?
- Is there any low-pass filter applied that I'm not aware of? If so, how can remove it?
Trying with different apps (e.g. Audalyzer) doesn't make any difference.