[linux-audio-dev] Re: Looking for fast integer resampling code

[David Cournapeau]

Alfons Adriaensen wrote:

>On Mon, Jun 13, 2005 at 04:59:57PM +1000, Erik de Castro Lopo wrote:
>
>  
>
>>With libsamplerate, I can state that the three sinc based converters
>>have the following characteristics:
>>
>>                                SNR        Bandwidth
>>    SRC_SINC_FASTEST         102.42 dB      80.23 %
>>    SRC_SINC_MEDIUM_QUALITY   98.99 dB      90.68 %
>>    SRC_SINC_BEST_QUALITY     97.43 dB      96.96%
>>
>>where SNR is signal to noise ratio and Bandwidth its a percentage of
>>the theoretical best bandwidth (ie half of the minimum of the source
>>and desination sample rate).
>>    
>>
>
>What do you mean by 'signal to noise ratio' of a resample algo ? 
>I see no reason why it should produce noise, 
>
The signal after the resampling is not the same than the original one, 
so there is a modification: you can call this modification noise, 
distortion, whatever :)

David