Hello, sorry for the late reply. Thank you. It was unfortunate that I haven't checked the schematic diagram Of Red Pitaya. It is now clear that analog signal from PC goes to Red pitayas ADC then CPU. Have a nice weekend.
Thanks again for your help. Best regards Khalil On Sat, 13 Jun 2020 at 12:46, Fabian Schwartau <[email protected]> wrote: > Hi, > take a look at the second page of the schematic of the Red Pitaya: > > http://downloads.redpitaya.com/doc/Red_Pitaya_Schematics_STEM_125-10_V1.0.pdf > It has an ADC and a DAC. The signal going into the ADC will show up in > the source block in GNU Radio, while the signal going into the sink > block in GNU Radio will come out of the DAC. Simple as that. > Best regards, > Fabian > > Am 13.06.20 um 12:40 schrieb Khalilur Rahman: > > Hello Fabian, > > I hope you are doing great! > > '' from Gnu Radio in PC digital modulation is done, the generated signal > > sink through Red Pitaya(FPGA). We are only concerned about processing > > the baseband signal by Gnu radio with Red Pitaya. From GitHub we found > > one SDR project. The 'sink' for red pitaya is also available on that > > project, so we don't need to make one. Now we are confused as the analog > > signal sink to Red pitaya how does it processing it? I mean the signal > > as an input to red pitayas CPU should be digital. '' > > Thank you > > > > Best regard > > Khalil > > > > > > On Sat, 13 Jun 2020 at 11:29, Fabian Schwartau <[email protected] > > <mailto:[email protected]>> wrote: > > > > Hey Khalil, > > > > first of all: every signal is digital within the computer. What you > > probably mean is what this signal represents. The output of a > modulator > > usually represents an anlog signal. It is of type float (or complex > > float) and each sample represents for example a voltage. I don't > > understand what you are supposed to do with that signal after that. > When > > you say you need to "sink this signal though an embedded processor" > you > > mean an external physical device? If that is the case you need some > sort > > of sink in GNU Radio, like an audio sink, which will convert you > digital > > signal into an analog audio signal (DAC). > > If you want to process the signal further, e.g. by filtering it, you > can > > do that in GNU Radio. > > Hope that helps, > > Fabian > > > > Am 13.06.20 um 10:40 schrieb Khalilur Rahman: > > > Hello Guys, > > > I was studying the digital modulation in regards to GNU Radio. I > have > > > one confusion which I really need to get over with. > > > > > > Let say, I am using BPSK modulation for processing low-frequency > > > baseband I- signal. After the digital modulation, the output > I-signal > > > is digital or analog type? Yes, as baseband signal it is > > > obviously analog. I mean the output type of constellation > > modulator. If > > > I put a time sink it will show as an analog signal but my study > > partner > > > said it is digital. Same with QPSK or QAM. I know this is very > basics > > > but I did not find any answer. > > > We need to generate baseband from GNU Radio and sink this signal > > through > > > an embedded processor for further signal processing. If the > > > constellation modulator gives an analog signal then we have to > first > > > convert signal through ADC. We are very much new on GNU Radio. > > > > > > Thank you in advance. > > > > > > Best regards > > > Khalil > > > > > > >
