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AN3959 датащи(PDF) 42 Page - STMicroelectronics

номер детали AN3959
подробное описание детали  The purpose of this application note is to describe
PDF  65 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3959 датащи(HTML) 42 Page - STMicroelectronics

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Software setup to use the STA381BW/STA381BWS devices (ST Map)
AN3959
42/65
Doc ID 022081 Rev 3
7.2.3
Example settings of the STCompressor
Band splitter:
●
Biquad 0, biquad 1 of band 0: low-pass filter with Fc = 200 Hz
Write in RAM the following values.
BQ0 band 0:
0x40
→0x000059
0x41
→0x000059
0x42
→0x1FB47A
0x43
→0xE095A7
0x44
→0x000002
BQ1 band0
0x45
→0x000059
0x46
→0x000059
0x47
→0x1FB47A
0x48
→0xE095A7
0x49
→0x000002
●
Biquad 0, biquad 1 of band 1: high pass filter with Fc = 200 Hz
Write in RAM the following values.
BQ0 band 1:
0x4A
→0xE04B2D
0x4B
→0x1FB4D3
0x4C
→0x1FB47A
0x4D
→0xE095A7
0x4E
→0x0FDA69
BQ1 band 1:
0x4F
→0xE04B2D
0x50
→0x1FB4D3
0x51
→0x1FB47A
0x52
→0xE095A7
0x53
→0x0FDA69
Limiter threshold = +2 dB
●
Coefficient value = HEX (+2/26*)223 = 0x040000
●
Write in RAM:
0x56
→0x040000
0x60
→0x040000
Compression threshold= -2 dB
●
Coefficient value = HEX [224 - (2/26) * 223] = HEX (16515072) = 0xFC0000
●
Write in RAM:
0x58
→0xFC0000
0x62
→0xFC0000



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