Re: [Discuss-gnuradio] GRC Polyphase Channelizer examples?

[Tom Rondeau]

On Fri, Oct 14, 2011 at 1:42 PM, John Ackermann N8UR <address@hidden> wrote:

Marcus D. Leech said the following on 10/14/2011 01:18 PM:

On 14/10/2011 12:53 PM, John Ackermann N8UR wrote:

Doesn't the PFB channelizer down-sample as well? So your output sample
rates from the channelizer will be mis-matched to the
UHD USRP sink?

That's what I'm trying to figure out.  A 4x interpolator doesn't seem to help, though.  I'm not sure if the "oversample" parameter in the channelizer might act as an interpolator, or if that provides some other function.

John

The oversample parameter is to make the outputs have some n samples/channel. By default, it's 1, so the output sample rate of each channel is fs_in/M for M channels; this is also the bandwidth (the signal is critically sampled). If you have n=2, then the sample rate of each channel is 2*fs_in/M, but your bandwidth is still fs_in/M. So you shouldn' need to worry about the oversample rate.

So, yes, the channels are downsampled by a factor of M.

Tom