Re: SNR computation in SRC (cntd..)

The documentation on the analog devices sample rate conversion chips has some
good theory info. Start here and also check out the datasheets for the parts
mentioned:

http://www.analog.com/en/content/0,2886,765%255F807%255F9690,00.html

By the way, if it were me, I would do this in one stage rather than 4. It is
much simpler to implement that way (though probably requires more memory, but
that's not generally an issue in Matlab).

--
Jon Harris
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"Govind" <govind_s@xxxxxxxxxxxxxxxx> wrote in message
news:WoqdnUGsSq4auN_eRVn-gQ@xxxxxxxxxxxxxxx
> >Govind <govind_s@xxxxxxxxxxxxxxxx> wrote:
>>
>>> I am trying to compute SNR with the method you've
>>> suggested. This time I am trying upconversion of a signal from
>>> 8KHz to 44.1KHz. I have implemented a four stage SRC code in
>>> matlab (with ratios 3/2, 3/2, 7/5 and 7/4 with filter taps 414,
>>> 54, 84 and 70 respectively using remez algorithm). I multiply the
>>> output by a factor of 441 (3*3*7*7) in time domain to compensate
>>> for interpolation stage losses. The frequency response seems
>>> to be good. But still I am getting SNR not more than 30-40 DB.
>>
>>You could consider using Lagrangian interpolation instead of
>>this cascade of filters.
>>
>>Steve
>>
>
> Hi Steve,
>
> Thanks for the reply. I have started looking for interpolation methods.
> Would you like to suggest/give me related docs or book?
>
> Govind
>
> This message was sent using the Comp.DSP web interface on
> www.DSPRelated.com


.

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