Slow Cortical Potentials and Amplification—Part II: Acoustic Measures

Table 2

Mean (𝑛=5) and standard deviation for gain measured at (i) 30 ms and (ii) maximum amplitude, and rise time (measured at 90% of maximum amplitude) for the cortical stimuli.

Nominal gain (dB); Input (dB SPL)	Short stimulus (60 ms)						Long stimulus (757 ms)
	20			40			20			40
	30	50	70	30	50		30	50	70	30	50
Analog
30 ms (dB)	15.9 ± 1.6	17.0 ± 0.9	17.3 ± 1.0	34.9 ± 2.2	36.2 ± 1.8		16.0 ± 0.7	16.7 ± 0.6	17.4 ± 0.7	35.5 ± 0.5	35.5 ± 1.4
Max (dB)	15.7 ± 1.1	16.9 ± 1.0	17.4 ± 0.1	34.5 ± 1.9	36.2 ± 2.0		15.2 ± 1.3	16.6 ± 0.7	17.3 ± 0.8	34.7 ± 1.9	35.3 ± 1.5
Rise time (ms)	22.2 ± 1.9	21.9 ± 1.4	22.4 ± 1.7	22.5 ± 1.4	22.1 ± 1.9		12.5 ± 3.2	11.6 ± 3.2	12.8 ± 2.8	11.9 ± 1.9	12.3 ± 2.6
DigitalA
30 ms (dB)	10.9 ± 4.5	15.8 ± 3.1	15.6 ± 3.1	30.1 ± 6.1	35.5 ± 3.5		13.1 ± 3.3	17.0 ± 2.0	16.8 ± 2.4	33.8 ± 3.2	36.1 ± 1.5
Max (dB)	15.4 ± 3.2	17.1 ± 2.7	16.7 ± 2.6	34.5 ± 4.3	36.3 ± 2.6		15.7 ± 2.4	17.8 ± 1.6	17.1 ± 2.6	36.9 ± 1.9	36.4 ± 1.3
Rise time (ms)	38.6 ± 3.7	27.9 ± 3.3	30.3 ± 3.1	33.8 ± 6.6	22.6 ± 2.3		39.4 ± 7.2	25.7 ± 7.4	23.4 ± 6.6	43.3 ± 14.7	18.8 ± 5.5
DigitalB
30 ms (dB)	−2.7 ± 2.1	0.9 ± 2.9	0.2 ± 2.3	21.5 ± 3.4	23.1 ± 2.3		−2.0 ± 3.2	1.4 ± 5.3	4.2 ± 3.9	23.1 ± 2.2	26.1 ± 2.6
Max (dB)	4.5 ± 3.8	7.6 ± 2.3	7.5 ± 1.1	26.2 ± 2.2	27.8 ± 1.6		13.8 ± 4.1	15.8 ± 3.1	17.4 ± 2.2	35.4 ± 1.8	37.0 ± 1.8
Rise time (ms)	45.5 ± 2.7	44.2 ± 1.8	45.2 ± 1.5	41.6 ± 2.4	40.9 ± 2.5		141.5 ± 8.9	150.8 ± 4.5	149.6 ± 8.4	154.5 ± 3.3	145.6 ± 3.2