[Asterisk-Dev] Re: lightning fast 9:1 compression ratio audio codec, anyone?

[Brian West]

Man that makes LPC10 sound excellent.

/b

On May 12, 2005, at 9:44 AM, Luke Kenneth Casson Leighton wrote:

> p.s. example 30-second wav file and its encoded-and-decoded
> form at:
>
>     http://hands.com/~lkcl/ahab-pcm
>
> just re-listened to it - it's not _that_ bad :)
>
> due to the way the algorithm works, it's the plosives that
> are _particularly_ adversely affected - something i _could_
> mitigate against with a bit more work.
>
> p.p.s. this codec would be _unbelievably_ simple to implement
> in hardware (again - mentioned for the archives / completeness
> as i don't honestly believe too many hardware people to be _that_
> interested in ahab-pcm - or software ones either :).
>
>
> On Thu, May 12, 2005 at 03:04:15PM +0100, Luke Kenneth Casson  
> Leighton wrote:
>
>
>> in a panic last month i tried to write an audio codec.
>>
>> it uses a hamming principle over-and-above what adpcm does.
>>
>> it _does_ have clipping artefacts (which would be mitigated
>> against when using higher sampling rates) , but it is blindingly
>> fast (utilises even less CPU than adpcm), and has a compression
>> ratio of about 9:1.
>>
>
> _______________________________________________
> Asterisk-Dev mailing list
> Asterisk-Dev at lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-dev
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-dev
>