Reverberation time is typically defined as
, the time, in
seconds, to decay by 60 dB.
- Each filter
requires 50,000 multiplies and additions per sample,
or 2.5 billion multiply-adds per second.
- Three sources and two listening points (ears)
30 billion operations per second
- 10 dedicated CPUs clocked at 3 Gigahertz
- multiply and addition initiated each clock cycle
- no wait-states for parallel input, output, and filter coefficient accesses
- FFT convolution is faster, if throughput delay is tolerable
Conclusion: Exact implementation of point-to-point transfer functions
is generally too expensive for real-time computation.