In my application, I need to analyze and differentiate the sound of two objects. One objects makes a high frequency pitch at 5khz which I'd like to detect. The other object tend to make sound around the 1khz range.
Rather than using a regular microphone, which is subject to ambient noise, I'm interested in piezo sensors or accelerometers that can contact the object directly.
In order to capture the high frequency pitch, does the sampling rate of the piezo sensor needs to be 10khz or above must like a regular microphone?
Also, does the contact (clamping) pressure between the sensor and the object matter?