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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STA381BWS датащи(PDF) 114 Page - STMicroelectronics |
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STA381BWS датащи(HTML) 114 Page - STMicroelectronics |
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114 / 171 page  Register description: Sound Terminal compatibility STA381BWS 114/171 Doc ID 018937 Rev 6 7.5.1 Noise-shaper bandwidth selection 7.5.2 AM mode enable The STA381BWS 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 active AM tuner. 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. 7.5.3 PWM speed mode 7.5.4 Zero-crossing enable The ZCE bit enables zero-crossing adjustment. When volume is adjusted on digital zero- crossing, no clicks are audible. 7.5.5 Soft volume update enable Table 119. Noise-shaper bandwidth selection Bit R/W RST Name Description 2 R/W 0 NSBW 1: Third order NS 0: Fourth order NS Table 120. AM mode enable Bit R/W RST Name Description 3R/W 0 AME 0: Normal FFX operation 1: AM reduction mode FFX operation Table 121. 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. Not suitable for binary BTL mode. Table 122. Zero-crossing enable Bit R/W RST Name Description 6R/W 0 ZCE ‘1’: Volume adjustments only occur at digital zero-crossing ‘0’: Volume adjustments occur immediately Table 123. Soft volume update enable Bit R/W RST Name Description 7R/W 1 SVE 1: Volume adjustments ramp according to SVR settings 0: Volume adjustments occur immediately |
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