Undescribed Horrific Abuse, One Victim & Survivor of Many
gmkarl at gmail.com
Thu Nov 10 06:25:47 PST 2022
this must have been the issue:
# then select only upper portion of 1 + bandwidth equal to period_length
ok, uhhhhhhhhhhhh so what is "bandwidth equal to period_length"
well, period_length says the period in recording samples that the wave is.
meanwhile, fft indices are frequencies in units of 1/bufsize, roughly.
so let's think about hte frequencies, roughly.
frequency 0 is DC offset. that means its period is infinite. (bufsize / 0)
frequency 1 is the first half vs the last half, its period is the
entire buffer. (bufsize / 1)
the last frequency, bufsize-1, is the nyquist frequency. its period is 2.
now what is bufsize?
the parameter of interest is the recording buffer size [continue]
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