TLV320AIC3254: Noise Gate Function in AIC3254

Trevor Hsu

Part Number: TLV320AIC3254

Could you help to check whether AIC3254 support Noise Gate Function?

The Noise Gate Function is use to reduce the noise flow for DAC path or ADC path. When input signal is
below noise gate level, the input signal will be reduced by ALC volume and to suppress the background
noise.

Trevor

over 4 years ago

0 Diljith over 4 years ago

TI__Expert 6440 points

Hi Trevor,

There is a Noise Gate component under TI Algorithms section in PPS. That is triggered based on voice activity.

Would that be suitable for your application? Or are you looking for a fixed threshold noise-gate?

Please let us know the application requirements so that we can recommend a suitable component.

Best Regards.

0 Trevor Hsu over 4 years ago in reply to Diljith

Genius 4505 points

Hi Diljith,

Our project using the microphone to collect audio signal, but our target signal level is around -60DB to 10DB.

We hop the AIC3254 can remain silent, when the target signal level is less than -70DB.

Can the codec support this feature or do we need to use a mini-DSP?

Thanks.

Trevor

0 Diljith over 4 years ago in reply to Trevor Hsu

TI__Expert 6440 points

Hi Trevor,

Noise Gates are not available as part of the PRB modes. For this functionality you would need to use the miniDSP mode.

The Noise Gate component that I suggested automatically determines the noise floor based on long term signal average.

The noise floor is not a programmable parameter. Only the noise floor attenuation is a programmable parameter.

Would the noise floor in your application remain fixed at -70 dB? With an SNR of 10 dB?

Could you please elaborate on the input characteristics and the attenuation needed?

Best Regards.

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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TLV320AIC3254: Noise Gate Function in AIC3254