australia แปลว่า Embedding Codec 2: open source speech coding on a low-cost microcontroller

Presenter(s): David Rowe
URL: https://lca2014.linux.org.au/schedule...

Codec 2 is the worlds only open source speech codec that compresses speech to 2000 bit/s and below. Codec 2 is now part of the FreeDV open source digital voice GUI package. Thousands of Ham Radio operators are using FreeDV every day for world-wide two-way HF radio contacts. FreeDV supports compressed digital speech over HF radio at 1600 bits/s using just 1100Hz of analog bandwidth and signal to noise ratios as low as 2dB.

FreeDV operates as a GUI program on a laptop or desktop PC. We are now porting Codec 2 and it's companion modem to an embedded processor. This will enable Codec 2 to be embedded into hand held and mobile two way radios and greatly expand the use of FOSS digital speech in HF and VHF radio applications.

This presentation will describe how Codec 2 and it's companion modem were embedded onto a low cost ARM 4 micro-controller. The software operates on "bare metal" - there is no operating system. The talk will describe how we verified the port at each stage and hacked gdb so that stdio functions (printf/fread/fwrite) running on the micro-controller could access the Host PCs peripherals. This made developing on the micro-controller similar to debugging a command line console program. The talk will also discuss how we implemented speech and modem analog I/O using the micro-controllers built-in ADC and DAC peripherals to build a low cost, turn key, open source digital voice solution on a single chip.


http://lca2014.linux.org.au - http://www.linux.org.au
CC BY-SA - http://creativecommons.org/licenses/b...

australia แปลว่า Embedding Codec 2: open source speech coding on a low-cost microcontroller
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