Software

Microphone array board support library

Microphone array board support library 1.0.0

Microphone array board support library

Library for controlling the XMOS microphone array ref design 1v0.

Features

The microphone array board support library has the following features:

  • button and led interface

Typical Resource Usage

This following table shows typical resource usage in some different configurations. Exact resource usage will depend on the particular use of the library by the application.

Configuration

Pins

Ports

Clocks

Ram

Logical cores

Default

13

3 (1-bit), 1 (4-bit), 2 (8-bit)

0

~1.3K

1

Software version and dependencies

This document pertains to version 1.0.0 of this library. It is known to work on
version 14.1.1 of the xTIMEcomposer tools suite, it may work on other versions.

The library does not have any dependencies (i.e. it does not rely on any other libraries).

None avaliable.

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Microphone array library

Microphone array library 2.0.0

Microphone array library

The XMOS microphone array library is designed to allow interfacing to PDM
microphones coupled with efficient decimation to user selectable output
sample rates. Additionally, a high resolution delay can be introduced to
each of the individual PDM microphones allowing for individual time shifts.
This library is only avaliable for XS2 devices.

Features

The microphone array library has the following features:

  • 48kHz, 24kHz, 16kHz, 12kHz and 8kHz output sample rate by default (3.072MHz PDM clock),
  • 44.1kHz, 22.05kHz, 14.7kHz, 11.025kHz and 7.35kHz output sample rate by default (2.8224MHz PDM clock),
  • 4, 8, 12 or 16 PDM interfaces per tile,
  • No less than 80dB of stop band attenuation for all output sample frequencies,
  • Configurable latency, ripple and bandwidth,
  • Framing, configurable frame size from 1 sample to 8192 samples plus 50% overlapping frames option,
  • Windowing and sample index bit reversal within a frame,
  • Individual microphone gain compensation,
  • DC offset removal,
  • Up to 3.072MHz input sample rate,
  • High resolution (2.63 microsecond) microphone specific delay lines,
  • Every task requires only a 62.5 MIPS core to run.

Components

  • PDM interface,
  • Four channel decimators,
  • High resolution delay block.

Software version and dependencies

This document pertains to version 2.0.0 of this library. It is known to work on
version 14.1.1 of the xTIMEcomposer tools suite, it may work on other versions.

This library depends on the following other libraries:

  • lib_logging (>=2.0.0)
  • lib_xassert (>=2.0.0)

None

Microphone array library Read More »

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