DirectForm2Filter QML Type

The DF2 filter's data. Set it to a JSON object with the following entries:

• order: The filter's order, or the number of iterations it performs. This is twice the number of second order sections the filter contains.
• sosMatrix: The filter's second order sections data, as a 2D JS array of real values. It should have order / 2 sub-entries each with 6 real values. These 6 values represent this filter section's coefficients B0, B1, B2, A0, A1, A2.
• scaleValues: The filter's second order sections scale values, as a JS array of real values.

Example:

DirectForm2Filter {
  data: ({
    order: 8,
    sosMatrix: [
      [1, 2, 1, 1, -1.999582010463876, 0.999583152065339],
      [1, 2, 1, 1, -1.998812233343328, 0.998813374505309],
      [1, 2, 1, 1, -1.998223471725322, 0.998224612551167],
      [1, 2, 1, 1, -1.997904980861054, 0.997906121505067]
    ],
    scaleValues: [
      0.000000285400366,
      0.000000285290495,
      0.000000285206461,
      0.000000285161003
    ]
  })
}

Note: The value A0 for a DF2 filter is always 1, so the actual value of the fourth entry in a sos-section is ignored.

Reset the filter algorithm's state and memory. Call this to treat the rest of the MP3Decoder's audio signal like a completely new audio signal.