Speex dev - Apr 2017 - Echo cancellation - usage & porting to MIPS32 architecture

Dear manager,

Our company is developing embedded product, which requires echo cancellation. We
found the speex license is open source under GPL, so we can use the library
source code.

I am struggling to port the echo cancellation part to MICROCHIP PIC32MZ family,
which is based on M14K core from MIPS. The compiler is MICROCHIP XC32 C
compiler.

Do you have kind of support for this project for porting to new architectures,
and then add the already supported architecture to the main project.

I presume if you can offer support to port the library to MIPS32, then we can
provide the project and you can include into the main branch.

Also if not possible, can we ask for some info during the porting, currently we
have the following issues:

- There are many variables of “int” type. Is this type signed 32bit integer?
- Do you have some test data, how the echo cancellation algorithm should behave?
It will be perfect if we can use it to debug the behavior of all algorithm
blocks separately?
- In my project I use the onboard ADC to take samples from the MIC every 125uS
(8KHz sampling rate) and PWM to output data to the speaker every 125uS. When I
collect full frame from the Microphone, I pass trough the EC algorithm. Due to I
need the speaker data of the same period, do I need to get earlier speaker data
(for example 20-30 samples before the frame period in order the signal to be
valid).

In general if you can help with info how to test and debug all blocks
separately, we can port the entire EC algorithm and then I can send back the
project, so you can include in the main branch, it will be tested and working.


Thank you in advance

Kind regards

Dimitar Belev
Soneco LTD
Mob: +359877398772
dimitar.belev at soneco.bg
www.soneco.bg


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