Benchmark Problems for Acoustical Parameters

Basic: A-12

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

a12.wav (RIFF waveform, 16 bit signed integer, monoral, sampling frequency: 48000 Hz)
a12.fb (floating-point binary (little endian), 144000 data, monoral, sampling frequency: 48000 Hz)

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Note

This benchmark's impulse response is modified white noise exponentically to fit about 1.5 seconds of reverberation time.

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Reverberation Time: T (s)

	125	250	500	1k	2k	4k	Regression interval
Okubo	1.50	1.60	1.58	1.50	1.50	1.50	-5 ~ -35 dB (T30)
Yasuda	1.51	1.60	1.58	1.50	1.50	1.50	-5 ~ -35 dB (T30)
Miyazaki	1.52	1.60	1.58	1.50	1.50	1.50	-5 ~ -35 dB (T30)

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Early Decay Time (s)

	125	250	500	1k	2k	4k
Okubo	1.82	1.30	1.46	1.53	1.54	1.56
Yasuda	1.82	1.31	1.46	1.53	1.54	1.56
Miyazaki	1.84	1.31	1.48	1.51	1.51	1.55

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Clarity: C₈₀ (dB)

	125	250	500	1k	2k	4k
Hoshi	2.19	1.24	0.40	-0.60	0.08	0.53
Miyazaki	2.28	1.17	0.49	-0.60	0.10	0.51

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Center Time: T_s (s)

	125	250	500	1k	2k	4k
Hoshi	0.106	0.100	0.109	0.115	0.112	0.110
Miyazaki	0.110	0.106	0.110	0.116	0.112	0.111
Yairi	0.098	0.10	0.10	0.11	0.11	0.11