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Topology: Add DMIC capture pipeline with gain and high-pass filter This patch adds topology sof-apl-eq-dmic to help testing acoustical audio capture via DMIC or work as example for other machine drivers. The capture format is set as four channels, S32_LE, 48 kHz. The IIR EQ is a 2nd order Butterworth high-pass with cut-off frequency at 50 Hz to suppress non-audible lowest frequencies. The EQ provides additional +20 dB gain to avoid the recording to sound too silent. The IIR EQ or additional FIR EQ instance can when needed provide other form factor specific equalization. Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
2018-10-09 20:12:12 +08:00
# 50 Hz 2nd order high-pass and +20 dB gain 09-Oct-2018
CONTROLBYTES_PRIV(EQIIR_priv,
` bytes "0x38,0x00,0x00,0x00,0x02,0x00,0x00,0x00,'
` 0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,'
` 0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,'
` 0x01,0x00,0x00,0x00,0x63,0xf3,0x96,0xc0,'
` 0xc6,0x59,0x68,0x7f,0x6d,0x89,0xed,0x1f,'
` 0x27,0xed,0x24,0xc0,0x6d,0x89,0xed,0x1f,'
` 0xfc,0xff,0xff,0xff,0xd0,0x4f,0x00,0x00"'
)