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lib_mic_array change log

5.4.0

  • CHANGED: All examples now build under XCommon CMake build system
  • ADDED: Will build without errors for XS2 targets but no API available
  • DEPRECATED: Previously used custom CMake build support. This will be removed in future versions. Please use XCommon CMake build system as provided in XTC 15.3.0 onwards for new projects.
  • Changes to dependencies:
    • lib_xcore_math: 2.0.0 -> 2.3.0

5.3.0

  • FIXED: Vanilla configuration now compiles correctly under XTC 15.3.0
  • ADDED: Support for XCommon CMake build system

5.2.0

  • Added 48 kHz decimator design script
  • Added documentation to cover 32 kHz and 48 kHz deciamtors

5.1.0

  • Added 16ch de-interleave to support 16 DDR mics on a single 8b port
  • Added parallel decimation use example
  • Fixed documentation generation issues

5.0.3

  • Improved default audio filter. Reduces noise floor and improves alias attentuation
  • Changed DCOE filter to increase attenuation below 20 Hz

5.0.2

  • Documentation improvements.

5.0.1

  • Updates lib_mic_array to use lib_xcore_math (formerly lib_xs3_math) version 2.0.2
  • Updates CMake project to use CPM to obtain dependencies (when top level project)
  • [issue #171] Changes behavior when mic array consumer gets backed up from a quiet deadlock to an ECALL exception
  • Also adds a way to allow blocks of PDM to be quietly dropped instead (see AssertOnDroppedBlock())

5.0.0

  • Mic Array library redesigned from scratch to make efficient use of XMOS XS3 architecture
  • Many unused features from previous versions have been dropped
  • Initial v5.0 features:
  • Supports 1-, 4-, and 8-bit ports
  • Supports both SDR and DDR microphone configurations
  • Use 1-16 PDM microphones
  • Configurable PDM clock frequency
  • Configurable two-stage decimating FIR
  • Reference filter with total decimation factor of 192 provided
  • Optional DC offset elimination filter
  • Configurable frame size (down to single sample)
  • Extensible C++ design
  • Changes to dependencies:
    • lib_dsp: Removed dependency
    • lib_logging: Removed dependency
    • lib_xassert: Removed dependency
    • lib_xcore_math: Added dependency 2.0.0

4.3.0

  • CHANGED: Use XMOS Public Licence Version 1
  • FIXED: Compiler warnings when MIC_DUAL_ENABLED is not defined

4.2.2

  • CHANGED: Pin Python package versions
  • REMOVED: not necessary cpanfile

4.2.1

  • CHANGED: Jenkinsfile pinned to Jenkins shared library 0.10.0
  • CHANGED: Updated the minimum version of libraries this library depends upon.

4.2.0

  • ADDED support for global define to set single/dual output buffer for mic_dual

4.1.0

  • Added mic_dual, an optimised single core, 16kHz, two channel version (not compatible with async interface)

4.0.0

  • ADDED: Support for arbitrary frame sizes
  • ADDED: #defines for mic muting
  • ADDED: Non-blocking interface to decimators for 2 mic setup
  • CHANGED: Build files updated to support new "xcommon" behaviour in xwaf.

3.2.0

  • Added xwaf build system support
  • Cleaned up some of the code in the FIR designer.
  • Removed fixed gain in examples
  • Update VU meter example
  • Fix port types in examples
  • Set and inherit XCC_FLAGS rather than XCC_XC_FLAGS when building library

3.1.1

  • Updated lib_dsp dependancy from 3.0.0 to 4.0.0

3.1.0

  • Modified the FIR designer to increase the first stage stopband attenuation.
  • Cleaned up some of the code in the FIR designer.
  • Updated docs to reflect the above.

3.0.2

  • Update DAC settings to work for mic array base board as well.

3.0.1

  • Filter design script update for usability.
  • Documentation improvement.
  • Changed DEBUG_UNIT to XASSERT_UNIT to work with lib_xassert.
  • Added upgrade advisory.
  • Added dynamic range subsection to documentation.

3.0.0

  • Added ability to route internal channels of the output rate of the mic_array to the mic_array so that they can benefit from the post processing of the mic_array.
  • Enabled the metadata which delivers the frame counter.
  • Small fix to the filter generator to allow the use of fewer taps in the final stage FIR.
  • Added significant bits collection to the metadata.
  • Added fixed gain control through define MIC_ARRAY_FIXED_GAIN.
  • Tested and enabled the debug mode for detecting frame dropping. Enabled by adding DEBUG_MIC_ARRAY to the Makefile.
  • Moved to using types from lib_dsp.
  • Bug fix in python FIR generator script resulting in excessive output ripple.
  • Default FIR coefficients now optimised for 16kHz output sample rate.
  • Added ability to remap port pins to channels.
  • MIC_ARRAY_NUM_MICS is now forced to a multiple of 4 with a warning if it changed.
  • Corrected MIC_ARRAY_DC_OFFSET_LOG2 default value reporting in documentation.
  • Changes to dependencies:
    • lib_dsp: Added dependency 3.0.0

2.0.1

  • Updated AN00221 to use new lib_dsp API for FFTs
  • Updates required for latest lib_mic_array_board_support API

2.0.0

  • Renamed all functions to match library structure
  • Decimator interface functions now take the array of mic_array_decimator_config structure rather than mic_array_decimator_config_common
  • All defines renames to match library naming policy
  • DC offset simplified
  • Added optional MIC_ARRAY_NUM_MICS define to save memory when using less than 16 microphones

1.0.1

  • Added dynamic DC offset removal at startup to eliminate slow convergance
  • Mute first 32 samples to allow DC offset to adapt before outputting signal
  • Fixed XTA scripte to ensure timing is being met
  • Now use a 64-bit accumulator for DC offset removal
  • Consolidated generators into a single python generator
  • Produced output frequency response graphs
  • Added 16 bit output mode

1.0.0

  • Major refactor
  • FRAME_SIZE_LOG2 renamed MAX_FRAME_SIZE_LOG2
  • Decimator interface now takes arrays of streaming channels
  • Decimators now take channel count as a parameter
  • Added filter designer script
  • Documentation updates
  • First stage now uses a FIR decimator
  • Changed decimation flow
  • Removed high res delay module
  • Added generator for FIR coefficients
  • Added ability to reduce number of channels active in a decimator
  • Increased number of FIR taps
  • Increased output dynamic range

0.0.2

  • Documentation fixes
  • Fixed frame number fix
  • Added frame metadata

0.0.1

  • Initial Release
  • Changes to dependencies:
    • lib_logging: Added dependency 2.0.0
    • lib_xassert: Added dependency 2.0.0