Table 1.

The phase shift measurements were carried out within the frequency range of 10,000 to 40,000 Hz, using 1000 Hz intervals, for both cases, with and without the high-pass filter.

Frequency interval [Hz]	High-pass filter deactivated [deg.]	High-pass filter activated [deg.]
1000	20.90	106.60
11,000	23.06	−98.71
12,000	25.05	−90.98
13,000	27.08	−83.42
14,000	29.26	−75.75
15,000	31.34	−68.35
16,000	33.33	−61.34
17,000	35.47	−54.43
18,000	37.63	−47.74
19,000	39.64	−41.53
20,000	41.70	−35.49
21,000	43.92	−29.64
22,000	45,10	−24.18
23,000	48.00	−18.96
24,000	50.20	−13.89
25,000	52.36	−9.04
26,000	54.37	−4.47
27,000	56.50	−0.023
28,000	58.72	4.32
29,000	60.79	8.44
30,000	62.85	12.38
31,000	65.08	16.34
32,000	67.25	20.15
33,000	69.28	23.65
34,000	71.46	27.23
35,000	73.72	30.75
36,000	75.78	34.20
37,000	77.90	37.53
38,000	80.19	40.89
39,000	82.34	44.15
40,000	84.41	47.30