DA7212 ALC and wind noise

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Thu, 2020-03-26 17:56

NickTheChemist

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Last seen:1 year 2 weeks ago

加入:2020-03-26 17:22

DA7212 ALC and wind noise

Hi! I'm trying to use ADC ALC system in DA7212. I switch on high-pass filter by ADC_HPF_EN = 1 (and ADC_VOICE_EN = 1). Unfortunately, input sound of ultra-low frequency - like wind or breath, produces ALC attenuation. Is there any way to filter low frequencies before ALC?

Best regards,

Nick

Device:

DA14580

Fri, 2020-03-27 11:56

bmcadam

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Last seen:1 week 5 days ago

加入:2015-09-16 16:25

The HPF comes after the ALC

The HPF comes after the ALC so it will have no effect. If you don’t care about the low frequencies (and want to throw them away) you could change the 1uF input capacitor on our evaluation board.

If you change this cap to 470nF it would move the cut off to 1/2pi*10k*470n = 33Hz

If you change this cap to 220nF it would move the cut off to 1/2pi*10k*220n = 72Hz

For further support suggestwav.support@diasemi.com.

Regards,

Barry