{"id":19156,"date":"2022-12-19T15:58:54","date_gmt":"2022-12-19T14:58:54","guid":{"rendered":"https:\/\/demdlx704as001.ad.harman.com\/?p=19156"},"modified":"2024-06-07T11:47:34","modified_gmt":"2024-06-07T09:47:34","slug":"fira-mimo","status":"publish","type":"post","link":"https:\/\/audioworx.transfunnel.co\/old\/?p=19156","title":{"rendered":"FIRA MIMO"},"content":{"rendered":"

FIRA MIMO audio object is a group of FIR filter banks associated with each input and output. FIRA stands for \u201cfir accelerator\u201d and it indicates that the underlying implementation uses a hardware accelerator. MIMO stands for \u201cmulti input multi output\u201d indicating that each output is the summation of one or more FIR filtered inputs.<\/p>\n

FIRA MIMO can be used for various applications like individual sound zones etc.<\/p>\n

Use Case: This audio object can be deployed whenever the audio requires the dual rate MIMO FIR filters taking into considerations the data pipeline delay and other limitations. More than one instance of FIRAMIMO also can be run in the same core .<\/em><\/p>\n

The AO supports in-place computation based on the core type.<\/p>\n

FIRA MIMO Properties<\/strong><\/p>\n

\"\"<\/p>\n\n\n\n\n\n\n\n
Properties<\/strong><\/td>\nDescription<\/strong><\/td>\n<\/tr>\n
# of Audio In<\/strong><\/td>\n\n

Enter the input value.<\/span><\/p>\n

Range: 1 to 20<\/span><\/p>\n

The default value is set to 4.<\/span><\/td>\n<\/tr>\n

# of Audio Out<\/strong><\/td>\n\n

Enter the output value.<\/span><\/p>\n

Range: 1 to 64<\/span><\/p>\n

The default value is set to 4.<\/span><\/td>\n<\/tr>\n

Number of taps for Hi filters<\/strong><\/td>\n\n

The number of filter coefficients (taps) for the high rate path is configured using the m_NumElements. All channels in the high rate path use the same number of taps.<\/span><\/p>\n

Range: 384 to 4096<\/span><\/p>\n

The default value is set to 384.<\/span><\/td>\n<\/tr>\n

Display Name<\/strong><\/td>\nDisplay name of the FIRAMIMO\u00a0 audio object in signal flow design. It can be changed based on the intended usage of the object.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Mode<\/strong><\/p>\n

There are no modes available for FIRA MIMO.<\/p>\n

Additional Parameters<\/strong><\/p>\n

\"\"<\/p>\n

Below table describes the FIRA MIMO additional parameters.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/strong><\/td>\nDescription<\/td>\n<\/tr>\n
Max delay for high-rate filters<\/strong><\/td>\n\n

Length of delay line for high-rate path.<\/span><\/p>\n

Range: 0 to 2048<\/span><\/p>\n

Default: 0<\/span><\/p>\n

Data Type: uint32_t<\/span><\/td>\n

\"\"<\/td>\n<\/tr>\n
Taps for low-rate filters<\/strong><\/td>\n\n

Number of taps for low-rate filters. All channels in the low rate path use the same number of taps which can be different from high rate.<\/span><\/p>\n

Range: 512 to 2048<\/span><\/p>\n

Default: 512<\/span><\/p>\n

Data Type: uint32_t<\/span><\/td>\n

\"\"<\/td>\n<\/tr>\n
Coefficient format<\/strong><\/td>\nFilter coefficient data format.<\/span><\/p>\n
    \n
  • 0: 32-bit floating point coefficients<\/span><\/li>\n
  • 1: IEEE 16-bit floating point coefficients<\/span><\/li>\n
  • 2: 16-bit fixed point coefficients<\/span><\/li>\n<\/ul>\n

    Range: 0 to 2<\/span><\/p>\n

    Default: 0<\/span><\/p>\n

    Data Type: uint8_t<\/span><\/td>\n

\"\"<\/td>\n<\/tr>\n
Down sampling Factor<\/strong><\/td>\nDown sampling factor.<\/span><\/p>\n
    \n
  • 0: Down sampling factor of 4<\/span><\/li>\n
  • 1: Down sampling factor of 16<\/span><\/li>\n<\/ul>\n

    Range: 0 to 1<\/span><\/p>\n

    Default: 1<\/span><\/p>\n

    Data Type: uint8_t<\/span><\/p>\n

     <\/td>\n

\"\"<\/td>\n<\/tr>\n
Conf matrix high<\/strong><\/td>\nConfiguration matrix for high rate filters.<\/span><\/p>\n
    \n
  • Dimension 1: Input of size 20 or number of input channels in SFD whichever is less.<\/span><\/li>\n
  • Dimension 2: Output of size 64 or number of output channels in SFD whichever is less.<\/span><\/li>\n<\/ul>\n

    Value:<\/span><\/p>\n

      \n
    • \u00a0 0: FIR not present<\/span><\/li>\n
    • \u00a0 1: FIR present<\/span><\/li>\n<\/ul>\n

      Range: 0 to 1<\/span><\/p>\n

      Default: 0<\/span><\/p>\n

      Data Type: uint8_t<\/span><\/td>\n

\"\"<\/td>\n<\/tr>\n
Conf matrix low<\/strong><\/td>\nConfiguration matrix for low rate filters.<\/span><\/p>\n
    \n
  • \u00a0\u00a0\u00a0 Dimension 1: Input of size 20 or number of input channels in SFD whichever is less.<\/span><\/li>\n
  • \u00a0\u00a0\u00a0 Dimension 2: Output of size 64 or number of output channels in SFD whichever is less.<\/span><\/li>\n<\/ul>\n

    Value:<\/span><\/p>\n

      \n
    • \u00a0 0: FIR not present<\/span><\/li>\n
    • \u00a0 1: FIR present<\/span><\/li>\n<\/ul>\n

      Range: 0 to 1<\/span><\/p>\n

      Default: 0<\/span><\/p>\n

      Data Type: uint8_t<\/span><\/td>\n

\"\"<\/td>\n<\/tr>\n
Max Processing Size<\/strong><\/td>\n\n

When 2 or more filters are enabled on an input channel, FIRAMIMO combines them and submits as one job to the accelerator. Max Processing Size is used as the max limit when combining. For example, when there are 6 filters enabled on an input channel and Max Processing Size is set to 4, FIRAMIMO submits first job for 4 filters and second job with 2 filters.<\/span><\/p>\n

Range: 2 to 8<\/span><\/p>\n

Default: 4<\/span><\/p>\n

Data Type: uint8_t<\/span><\/td>\n

\"\"<\/td>\n<\/tr>\n
Enable Cycles Measurement<\/strong><\/td>\nEnable\/Disable realtime accelerator mcps (million cycles per second). When enabled, Average and Max mcps available to be read as tuning parameters in sate variable explorer.<\/span><\/p>\n
    \n
  • 0: Disable<\/li>\n
  • 1: Enable<\/li>\n<\/ul>\n

    Range: 0 to 1<\/p>\n

    Default: 0<\/p>\n

    Data Type: uint8_t<\/td>\n

\"\"<\/td>\n<\/tr>\n
Accelerator Configuration<\/strong><\/td>\nSelect which among the available FIR hardware accelerator to use for the FIR processing.<\/p>\n
    \n
  • 0: Accelerator 1 (Default)<\/li>\n
  • 1: Accelerator 2<\/li>\n
  • 2: Both Accelerators<\/li>\n<\/ul>\n

    Range: 0 to 2<\/p>\n

    Default: 0<\/p>\n

    Data Type: uint8_t<\/p>\n

    On ADSP-21593, when this configuration is set to Accelerator 1, only the first accelerator will be used, when set to Accelerator 2, only the second accelerator will be used, and when set to Both Accelerators, both available FIR accelerators will be used with almost equal number of filters processed by both accelerators.<\/p>\n

    When both hardware accelerators are used and “enable cycles measurement” additional configuration is enabled, the average and maxixmum mcps of both the accelerators shall be individually readable from the SV explorer.<\/p>\n

    On DSPs with only a single accelerator such as the ADSP-21569 (GUL), selection of accelerator configuration will be available, however, all filtering jobs will be processed by the only available FIR accelerator.<\/p>\n

    \u00a0<\/span><\/td>\n

\n

\"\"<\/p>\n

\"\"<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Tuning Parameters<\/strong><\/p>\n

For each filter combination in FIRA MIMO, this object exposes these two tuning parameters to the GTT:<\/p>\n

Mode:<\/strong>\u00a0The mode of each filter can be set to:<\/p>\n