I have a sine wave (uV level) that is in varying frequency (1kHz to 8kHz). I like to design a band pass filter that attenuates the other frequencies while amplifying my target frequencies and this can be achieved with design tools from TI, Analog etc. However, all these tools provide several filter types such as Butterworth, Bessel, Linear phase etc.
My plan is to digitize the amplified and bandpass filtered signal at 50kHz and do signal processing on it to determine how the frequency of the system is changing over time. I am predominantly a software guy and I like to make sure I choose the right filter type.
I think preserving the shape and amplitude of the signal is my priority across frequencies I am interested as opposed to having a linear phase difference etc.
Does this make sense considering I am predominantly interested in what are the frequencies at which point of time?
Which type of filter I should choose for my application?