stephb9959

%%% This macro will create a function that converts a record to
%%% a {key, value} list (a proplist)

-define(record_to_list(Record),
    fun(Val) ->
        Fields = record_info(fields, Record),
        [_Tag| Values] = tuple_to_list(Val),
        lists:zip(Fields, Values)
    end
).

stephb9959

/* fix_fft.c - Fixed-point in-place Fast Fourier Transform  */
/*
  All data are fixed-point short integers, in which -32768
  to +32768 represent -1.0 to +1.0 respectively. Integer
  arithmetic is used for speed, instead of the more natural
  floating-point.

  For the forward FFT (time -> freq), fixed scaling is
  performed to prevent arithmetic overflow, and to map a 0dB
  sine/cosine wave (i.e. amplitude = 32767) to two -6dB freq

stephb9959

I've graduate from a gist to a full repo. See https://github.com/ccutrer/balboa_worldwide_app, especially https://github.com/ccutrer/balboa_worldwide_app/blob/master/doc/protocol.md