(Dec 30 2000)

Sampling rate = 96kHz.
No of A/D channels = 1. No of RF channels = 1. Useful bandwidth 90 kHz. The PentiumIII is much faster than required for a small system and therefore the data is collected at higher speed using a Delta44 audio board. The numbers in the tables give the relative speed of the different fft routines designed for use with in a small system using a single audio channel. SIZE = 65536 16 bit no window, bandwidth 0.73Hz Vers Name Time 0 Approx. radix 2 DIF C 7.58% 1 Approx. radix 2 DIF ASM 7.05% 2 -------------- 3 Approx. radix 4 DIT C 4.88% SIZE = 32768 16 bit no window, bandwidth 1.46Hz Vers Name Time 0 Approx. radix 2 DIF C 5.02% 1 Approx. radix 2 DIF ASM 4.78% 2 Split radix DIT C 5.62% 3 Approx. radix 4 DIT C 3.87% SIZE = 4096 16 bit no window, bandwidth 11.7Hz Vers Name Time 0 Approx. radix 2 DIF C 2.55% 1 Approx. radix 2 DIF ASM 2.38% 2 Split radix DIT C 2.49% 3 Approx. radix 4 DIT C 2.36% SIZE = 65536 16 bit sin squared window, bandwidth 1.46Hz Vers Name Time 0 Approx. radix 2 DIF C 14.74% 1 Approx. radix 2 DIF ASM 13.42% 2 -------------- 3 Approx. radix 4 DIT C 9.72% SIZE = 32768 16 bit sin squared window, bandwidth 2.9Hz Vers Name Time 0 Approx. radix 2 DIF C 10.33% 1 Approx. radix 2 DIF ASM 8.44% 2 Split radix DIT C 8.71% 3 Approx. radix 4 DIT C 7.60% SIZE = 4096 16 bit sin squared window, bandwidth 23Hz Vers Name Time 0 Approx. radix 2 DIF C 4.84% 1 Approx. radix 2 DIF ASM 4.44% 2 Split radix DIT C 5.00% 3 Approx. radix 4 DIT C 4.28% |