Bandpass Amplitude Acoustics BA Amplitude of a specific frequency band over time. recording rate rate/2 appended_recording recording_subrange recording_length samples actual_samples/2 actual_samples/2+1 actual_samples+1 actual_samples subrange_start period df time frequency fftX fftY halfFrequency halfFFTtempX halfFFTtempY fft f0 amplitude t a tnow f1 f2 filteredFFT f1x f1y f2x f2y t amplitude f0 halfFrequency fft f1x f1y f2x f2y f1 f2 time recording_subrange tnow recording_subrange recording appended_recording appended_recording recording_length recording_length samples subrange_start subrange_start appended_recording recording_subrange recording_subrange actual_samples actual_samples 1 actual_samples+1 actual_samples 2 actual_samples/2 actual_samples/2 1 actual_samples/2+1 actual_samples rate period 1 period df rate 2 rate/2 0 period actual_samples+1 time 0 rate/2 actual_samples/2+1 frequency recording_subrange fftX fftY 1 actual_samples/2 frequency fftX fftY halfFrequency halfFFTtempX halfFFTtempY halfFFTtempX halfFFTtempY fft fft halfFrequency f0 f1y fft halfFrequency f1 f2 filteredFFT filteredFFT a f1 f1 f1x f2 f2 f2x fft f1y f1y f2y tnow a t amplitude t amplitude time recording_subrange