RE: [Discuss-gnuradio] Reducing the ADC sample rate

[Robitaille, Michael]

On Monday, November 14, 2005 4:30 PM, Eric Blossom [mailto:address@hidden
To: address@hidden

>On Mon, Nov 14, 2005 at 06:17:16PM -0500, address@hidden wrote:
>> On Fri, 11 Nov 2005 11:42:18 -0800, Eric responded:
>> 
>> I just saw that in the schematic that the AD9862 gets its clock dirrectly
>> from the VCTCXO.  
>> 
>> Is there any other way to decrease the sample rate beside the decim_rate?

>The ADCs always run at the oscillator rate (low jitter).

Very good point.

> decim_rate sets how much decimation is done in the FPGA.  You can of
> course perform additional decimation in software.  You'd probably want
> to use gr.fir_filter_ccf for that job.  The first argument is the
> decimation rate.

I will try using additional decimation, any information on how to use this
would be appreciated.  I tried the use the filter function like that shown
in the tvrx_am example and got an error.

Eric