Re: [Discuss-gnuradio] Resampler with changing rate during runtime

[Sebastian Müller]

Hi Kevin,

the problem arises since my blocks detect signals in the spectrum and estimate their bandwidth. Then, each signal gets filtered and decimated to the needed sample rate according to Nyquist-Shannon. This sample rate is well defined, but only known during runtime.

Regards

Sebastian

2016-08-04 17:47 GMT+02:00 Kevin Reid <address@hidden>:

On Wed, Aug 3, 2016 at 8:29 AM, Sebastian Müller <address@hidden> wrote:

Now, the quadrature rate and audio decimation are unknown before runtime, but calculated by my other blocks while running. For this purpose, I would like to implement a block, that resamples any given signal to a fixed output sample rate (in this example a bit more than the audio rate). I have messages available that contain the sample rate of my input signal as well as the input signal itself.

I'd like to ask: How does this problem arise? In my experience, almost every element of the flowgraph has a specific sample rate (sources and sinks) or rate ratio (interpolators/decimators), so even if you decide you need a certain different rate, you're always going to be modifying the configuration of at least two blocks.

How is it that you come to have a stream with a dynamic sample rate?

(I suspect that you are overcomplicating your problem by requiring it to be solved within the flow graph rather than by external control code which can reconfigure the flow graph appropriately, but I don't have enough information about what your app is doing to be certain.)