Benchmark Problems for Acoustical Parameters

Basic: A-13

Find values of reverberation time (T), early decay time (EDT), clarity (C₈₀) and center time (T_s) from following impulse response.

a13.wav (RIFF waveform, 16 bit signed integer, monoral, sampling frequency: 48000 Hz)
a13.fb (floating-point binary (little endian), 288000 data, monoral, sampling frequency: 48000 Hz)

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Note

This benchmark's impulse response is modified white noise to decay the energy exponentially and to fit about 3.0 second reverberation time.

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Reverberation Time: T (s)

	125	250	500	1k	2k	4k	Regression interval
Okubo	3.00	3.01	2.88	2.98	2.97	3.01	-5 ~ -35 dB (T30)
Yasuda	3.00	3.01	2.88	2.98	2.98	3.01	-5 ~ -35 dB (T30)
Miyazaki	2.99	3.02	2.88	2.97	2.98	3.01	-5 ~ -35 dB (T30)
Yairi	3.04	2.92	2.90	2.98	2.97	3.00	-5 ~ -35 dB (T30)

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Early Decay Time: EDT (s)

	125	250	500	1k	2k	4k
Okubo	3.07	2.88	3.19	2.94	3.03	3.05
Yasuda	3.07	2.88	3.19	2.94	3.03	3.05
Miyazaki	3.20	2.87	3.21	2.94	3.05	3.06

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Clarity: C₈₀ (dB)

	125	250	500	1k	2k	4k
Hoshi	-2.43	-2.45	-3.57	-4.36	-3.82	-3.47
Miyazaki	-2.35	-2.55	-3.47	-4.32	-3.79	-3.49

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Center Time: T_s (s)

	125	250	500	1k	2k	4k
Hoshi	0.228	0.202	0.224	0.224	0.225	0.223
Miyazaki	0.232	0.210	0.225	0.224	0.222	0.223
Yairi	0.210	0.219	0.219	0.217	0.222	0.223