Benchmark Problems for Acoustical Parameters

Basic: A-11

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

a11.wav (RIFF waveform, 16 bit signed integer, monoral, sampling frequency: 48000 Hz)
a11.fb (floating-point binary (little endian), monoral, sampling frequency: 48000 Hz)

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Note

This benchmark's impulse response is modified white noise exponentically to fit about 0.5 second of reverberation time.

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Reverberation Time: T (s)

	125	250	500	1k	2k	4k	Regression interval
Okubo	0.58	0.45	0.49	0.51	0.51	0.51	-5 ~ -35 dB (T30)
Miyazaki	0.59	0.45	0.50	0.50	0.50	0.51	-5 ~ -35 dB (T30)
Hoshi	0.58	0.45	0.49	0.51	0.51	0.51	-5 ~ -35 dB (T30)

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Early Decay Time (s)

	125	250	500	1k	2k	4k
Okubo	0.38	0.54	0.48	0.57	0.50	0.50
Miyazaki	0.37	0.53	0.48	0.58	0.51	0.49

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Clarity: C₈₀ (dB)

	125	250	500	1k	2k	4k
Hoshi	11.80	9.72	8.91	8.09	8.82	9.43
Miyazaki	11.23	8.93	8.54	7.42	8.71	9.37

*modified on 1st Dec. 2018.

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Center time: T_s (s)

	125	250	500	1k	2k	4k
Hoshi	0.032	0.037	0.038	0.040	0.038	0.036
Miyazaki	0.039	0.042	0.040	0.042	0.038	0.036
Yairi	0.033	0.034	0.038	0.042	0.035	0.036