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soft/topology/m4/eq_iir_coef_flat.m4

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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
# Flat IIR EQ 11-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,'
` 0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,'
` 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,'
` 0x00,0x00,0x00,0x00,0x9e,0x73,0x13,0x20,'
` 0x00,0x00,0x00,0x00,0xb2,0x7f,0x00,0x00"'
)