BU9414FV Datasheet, PDF (49/61 Pages) Rohm – 32bit Audio DSP

BU9414FV
Technical Note
9. About frequency setting such as tone control and parametric equalizer
Because the sampling rate converter is not built into BU9414FV, the calculation clock of DSP is changed according to the
input sampling rate of I2S.
Because sampling rate describes the frequency on the assumption of 48kHz in this function specification, conversion is
needed in case of sampling frequency of 44.1kHz and 32kHz.
Please refer to the table below for F0 setting of tone control (Bass, Middle, Treble) and parametric equalizer.
F₀ (fs=48kHz)
Command Frequency Command Frequency Command Frequency Command Frequency Command Frequency Command Frequency Command Frequency Command Frequency
00
20Hz
08
50Hz
10 125Hz 18 315Hz 20 800Hz 28
2kHz
30
5kHz
38 12.5kHz
01
22Hz
09
56Hz
11 140Hz 19 350Hz 21 900Hz 29 2.2kHz 31 5.6kHz 39 14kHz
02
25Hz
0A
63Hz
12 160Hz 1A 400Hz 22
1kHz
2A 2.5kHz 32 6.3kHz 3A 16kHz
03
28Hz
0B
70Hz
13 180Hz 1B 450Hz 23 1.1kHz 2B 2.8kHz 33
7kHz
3B 18kHz
04
32Hz
0C
80Hz
14 200Hz 1C 500Hz 24 1.25kHz 2C 3.15kHz 34
8kHz
3C 20kHz
05
35Hz
0D
90Hz
15 220Hz 1D 560Hz 25 1.4kHz 2D 3.5kHz 35
9kHz
3D
-
06
40Hz
0E 100Hz 16 250Hz 1E 630Hz 26 1.6kHz 2E
4kHz
36 10kHz 3E
-
07
45Hz
0F 110Hz 17 280Hz 1F 700Hz 27 1.8kHz 2F 4.5kHz 37 11kHz 3F
-
F₀ (fs=44.1kHz)
Command Frequency Command Frequency Command Frequency Command Frequency Command Frequency Command Frequency Command Frequency Command Frequency
00
18Hz
08
46Hz
10 115Hz 18 289Hz 20 735Hz 28 1.84kHz 30 4.59kHz 38 11.5kHz
01
20Hz
09
51Hz
11 129Hz 19 322Hz 21 827Hz 29 2.02kHz 31 5.15kHz 39 12.9kHz
02
23Hz
0A
58Hz
12 147Hz 1A 368Hz 22 919Hz 2A 2.3kHz 32 5.79kHz 3A 14.7kHz
03
26Hz
0B
64Hz
13 165Hz 1B 413Hz 23 1.01kHz 2B 2.57kHz 33 6.43kHz 3B 16.5kHz
04
29Hz
0C
74Hz
14 184Hz 1C 459Hz 24 1.15kHz 2C 2.89kHz 34 7.35kHz 3C 18.4kHz
05
32Hz
0D
83Hz
15 202Hz 1D 515Hz 25 1.29kHz 2D 3.22kHz 35 8.27kHz 3D
-
06
37Hz
0E
92Hz
16 230Hz 1E 579Hz 26 1.47kHz 2E 3.68kHz 36 9.19kHz 3E
-
07
41Hz
0F 101Hz 17 257Hz 1F 643Hz 27 1.65kHz 2F 4.13kHz 37 10.1kHz 3F
-
F₀ (fs=32kHz)
Command Frequency Command Frequency Command Frequency Command Frequency Command Frequency Command Frequency Command Frequency Command Frequency
00
13Hz
08
33Hz
10
83Hz
18 210Hz 20 533Hz 28 1.33kHz 30 3.33kHz 38 8.33kHz
01
15Hz
09
37Hz
11
93Hz
19 233Hz 21 600Hz 29 1.47kHz 31 3.73kHz 39 9.33kHz
02
17Hz
0A
42Hz
12 107Hz 1A 267Hz 22 667Hz 2A 1.67kHz 32 4.2kHz 3A 10.7kHz
03
19Hz
0B
47Hz
13 120Hz 1B 300Hz 23 733Hz 2B 1.87kHz 33 4.67kHz 3B 12kHz
04
21Hz
0C
53Hz
14 133Hz 1C 333Hz 24 833Hz 2C 2.1kHz 34 5.33kHz 3C 13.3kHz
05
23Hz
0D
60Hz
15 147Hz 1D 373Hz 25 933Hz 2D 2.33kHz 35
6kHz
3D
-
06
27Hz
0E
67Hz
16 167Hz 1E 420Hz 26 1.07kHz 2E 2.67kHz 36 6.67kHz 3E
-
07
30Hz
0F
73Hz
17 187Hz 1F 467Hz 27 1.2kHz 2F
3kHz
37 7.33kHz 3F
-
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2012.03 - Rev.A