Packing two channels of real signals into 1 FFT (same-ish process as Real FFT). Packing two channels of IR into 1 FFT
Then calculate all convos, for True Stereo that is four IRs, BUT sum them in Frequency domain, back to only TWO channels, whivh can be IFFT'ed back together using the RFFT approach!
I.E. A four channel 'true stereo' IR requires a single FFT and single IFFT! and two convolutions? Does this make sense?
COMPUTING THE FFT OF TWO REAL SIGNALS USING A SINGLE FFT - J. Shima - 4/15/2000 If x(n) is a real-valued signal, with n = 0 to N-1, we can perform an N-pt FFT by filling x(n) into the real part of the FFT array, and zeroing out the imaginary part of the FFT array (since x(n) is strictly real). FFT array real part holds [ x(0) x(1) x(2) … x(N-1)] imag part holds [0 0 0 0 … 0] The FFT of x(n), denoted X(k), ends up being symmetric: X(k) = X*(N-k) for k = 0 to N-1 Here is a diagram showing the symmetry of X(k) for CASE A.