Re: [Discuss-gnuradio] Filters in X310

[Martin Braun]

We use 2 identical halfbands with 47 taps each. Taps: -62, 0, 194, 0,
-440, 0, 855, 0, -1505, 0, 2478, 0, -3900, 0, 5990, 0, -9187, 0, 14632,
0, -26536, 0, 83009, 131071, 83009, 0, -26536, 0, 14632, 0, -9187, 0,
5990, 0, -3900, 0, 2478, 0, -1505, 0, 855, 0, -440, 0, 194, 0, -62


Cheers,
M

On 01/05/2017 01:03 AM, chu li wrote:
> Hello,
> 
> i have some questions about the interpolation/decimation filters in the
> x310 with CBX-120.
> 
> In RX direction
> 1. CIC filter for odd factors in decimation
> 2. 31-tap half band filters for factors of 2 each,
> hb_dec,taps=round(2^18* halfgen4(0.7/4,8)))
> 3. 7-tap half band filters, small_hb_dec, taps2 = 2 * 131072 *
> halfgen4(.75/8,2)
> 
> i want to know which filters are used in TX, and can you tell me the
> coefficients for the filters.
> 
> Best regards,
> Li
> 
> 
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