Active Noise Cancellation (ANC) block diagram

Design Considerations

Active Noise Cancellation (ANC)

The active noise cancellation system implements the acoustically adaptive algorithm that cancels the unwanted sound by generating an antisound (antinoise) of equal amplitude and opposite phase. The original, unwanted sound and the antinoise acoustically combine, resulting in the cancellation of both sounds.

The core subsystems include:

DSP
– performs system initialization and executes the adaptive signal processing algorithm.

Memory
– stores executing code and data/parameters.

AGC
– maximizes the ADC SNR and maintains the overall system dynamic range.

Audio CODEC
– the residual noise signals are converted o digital form by the ADC. The DAC generates the out put anti-noise signals.

Power Conversion
– converts the battery power to run various functional blocks

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