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STA350BW データシート(PDF) 43 Page - STMicroelectronics

部品番号 STA350BW
部品情報  Sound Terminal® 2.1-channel high-efficiency digital audio system
PDF  86 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA350BW データシート(HTML) 43 Page - STMicroelectronics

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STA350BW
Register description
Doc ID 018572 Rev 3
43/86
7.5.3
Noise-shaper bandwidth selection
7.5.4
AM mode enable
The STA350BW features an FFX processing mode that minimizes the amount of noise
generated in the frequency range of AM radio. This mode is intended for use when FFX is
operating in a device with an AM tuner active. The SNR of the FFX processing is reduced to
approximately 83 dB in this mode, which is still greater than the SNR of AM radio.
7.5.5
PWM speed mode
7.5.6
Distortion compensation variable enable
7.5.7
Zero-crossing volume enable
The ZCE bit enables zero-crossing volume adjustments. When volume is adjusted on digital
zero-crossings, no clicks are audible.
Table 36.
Noise-shaper bandwidth selection
Bit
R/W
RST
Name
Description
2
R/W
0
NSBW
1: Third order NS
0: Fourth order NS
Table 37.
AM mode enable
Bit
R/W
RST
Name
Description
3R/W
0
AME
0: Normal FFX operation
1: AM reduction mode FFX operation
Table 38.
PWM speed mode
Bit
R/W
RST
Name
Description
4R/W
0
PWMS
0: Normal speed (384 kHz) all channels
1: Odd speed (341.3 kHz) all channels
Table 39.
Distortion compensation variable enable
Bit
R/W
RST
Name
Description
5R/W
0
DCCV
0: Use preset DC coefficient
1: Use DCC coefficient
Table 40.
Zero-crossing volume enable
Bit
R/W
RST
Name
Description
6R/W
1
ZCE
1: Volume adjustments only occur at digital zero-crossings
0: Volume adjustments occur immediately



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