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The Linux kernel configuration item CONFIG_SND_SOC_TEGRA186_DSPK:

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Config to enable the Digital Speaker Controller (DSPK) which converts the multi-bit Pulse Code Modulation (PCM) audio input to oversampled 1-bit Pulse Density Modulation (PDM) output. From the signal flow perspective DSPK can be viewed as a PDM transmitter that up-samples the input to the desired sampling rate by interpolation and then converts the oversampled PCM input to the desired 1-bit output via Delta Sigma Modulation (DSM). Say Y or M if you want to add support for Tegra186 DSPK module.



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