Benchmark Problems for Acoustical Parameters

Check: B-21

Find values of C₈₀ from following impulse response.

b21.wav (RIFF waveform, 16 bit signed integer, monoral, sampling frequency: 48000 Hz)
b21.fb (floating-point binary (little endian), 48000 data, monoral, sampling frequency: 48000 Hz)

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Note

This Benchmark problem aims to check own program about finding appropriate position of direct sound from an impulse response which has heavy background noise. This benchmark's impulse response was based on a white noise and modified it exponentially made to have about 0.5 second reverberation time. Additionally, this impulse response was overlapped with white noise for background noise and added an large energy before 80 ms for detecting the difference of the direct sound position as the C₈₀ value.
Explication of this benchmark problem was written in Column 3: Detecting the location of direct sound. Please check it.

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Clarity: C₈₀ (dB)

	125	250	500	1k	2k	4k
Hoshi	11.26	8.50	8.72	7.14	8.00	9.05
Miyazaki	11.21	8.37	8.59	7.05	7.97	8.99