Difference between revisions of "Asterisk DSP"

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==History==
 
==History==
 
This project stemmed from the time I spent in tech support at Digium.  Foreign customers always complained that call progress detection was either unavailable for them, or buggy.
 
This project stemmed from the time I spent in tech support at Digium.  Foreign customers always complained that call progress detection was either unavailable for them, or buggy.
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==Related Information==
 +
*[[IRC bot for controlling an Asterisk server]]
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*[[Backpack Payphone]]
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*[[Victorian Cellphones]]
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[[Category: Project idea]]

Latest revision as of 12:29, 25 August 2011

Status

Cancelled:

I don't have time for this work.

Details

This project will focus on improvement of the goertzel algorithm in asterisk's dsp.c. This won't be an improvement to the algorithms themselves, but more to the frequencies detectable by the code. It is currently detects US tones only which limits call progress severely. The ultimate goal of this project is to get the code submitted and into trunk so that it can go into the next major release of Asterisk.

Frequencies already supported:

  • US Modes
    • 350Hz
    • 440Hz
    • 480Hz
    • 620Hz
    • 950Hz
    • 1400Hz
    • 1800Hz
  • CR/BR Modes
    • 425Hz
  • UK Modes
    • 400Hz


Additional frequencies required for near-total international support:

  • Used by some countries
    • 450Hz
  • Used only by Japan
    • 384Hz
    • 416Hz
  • Used only by the Netherlands
    • 150Hz
  • Used only by Singapore
    • 270Hz
    • 320Hz

History

This project stemmed from the time I spent in tech support at Digium. Foreign customers always complained that call progress detection was either unavailable for them, or buggy.

Related Information