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Wolfgang Spindler (@wolf22)

studied Physics in 1973..77, worked in semiconductor industries, now looking on digital signal processing for hobby purposes, shortwave, vhf/uhf communications

Re: Adding 45 degrees phase shift to a FIR bandpass

Reply posted 3 years ago (02/01/2021)
Hello again,I digged out this old topic, because I think, that the final solution may be of interest to people, who are interested in SDR projects.So let's start...
to naumankalia:dBm is a relation - a logarithmic relation. dBm is related to 1 mW (milli Watt) But electrical power (in german: "Leistung") is not related to digital...
Thanks for the translation.Now.. one week of silence here - and I have not a solution for your problem, but some kind of hint: Probably you know the nice book "The...

Re: DSP Textbook Available Online

Reply posted 6 years ago (12/08/2018)
Dear Rick,I really DO like the book from Steven, I printed it out a long time ago and it was very helpful for me.You are right, it is all for the problem of receiving...

Re: Learning FPGA

Reply posted 6 years ago (12/08/2018)
We are here on DSP-related - and FPGA's are quite different.I do not think, that the learning curve is steep, but it is in directions, which seem to be rather queer...

Re: DSP Textbook Available Online

Reply posted 6 years ago (12/08/2018)
Dear Rick, many thanks for the link. But unfortunately this kind of books is not really suitable for people like me, where the study of mathematics was 40 years...
Your question is worrying me. (besides: I need to translate it to german before I can try to understand your desire)When you want to see the amplitude response of...

Re: Forums Update, Tips and Tricks - Please Read!

Reply posted 7 years ago (12/18/2016)
Dear Stephane,Thumbs-Up buttons and beer buttons? Is this the level we expect? A bavarian 'Wirtshaus' with men sitting around a round table in their 'Lederhosen'...

Re: Best Real Time Convolution Algorithm?

Reply posted 8 years ago (11/06/2016)
"There is nothing like zero latency and zero delay in reality..."Oh yes, you always can do this - regardless of the method - but for a certain price.Imagine you...

Re: SSB Demodulation

Reply posted 8 years ago (11/06/2016)
Reading the whole thread I come to the conclusion, that most people here think at first in discrete frequencies. This is wrong, because it lures one into neglecting...
Hallo Andy,as far as I understand you, you have:1. a serial link, which can transport 24 bits in one transmission.2. the link is slow, the hardware is already finished...

Re: Adding 45 degrees phase shift to a FIR bandpass

Reply posted 8 years ago (07/16/2016)
Dear Richard,your picture shows nearly my ideas. But the part of the signal way you have named "decimation", is in my imagination quite different: It consists of...

Re: Adding 45 degrees phase shift to a FIR bandpass

Reply posted 8 years ago (07/15/2016)
Oh, you ask for a more detailed description. So I will try:1. Converting down a rf signal to baseband with a I/Q-mixer will give 2 signals in the baseband named...

Re: Adding 45 degrees phase shift to a FIR bandpass

Reply posted 8 years ago (07/15/2016)
Dear Richard,thanks for the hint, but it does not really touch my problem. I have a rather strange impression regarding this topic: Today nobody constructs a rf...

Re: Adding 45 degrees phase shift to a FIR bandpass

Reply posted 8 years ago (07/13/2016)
Of course it is essential to do the phase shift together with the filtering in the same filter kernel. I must not waste any computing power by running two kernels,...

Re: Adding 45 degrees phase shift to a FIR bandpass

Reply posted 8 years ago (07/12/2016)
Oh, I think, I am a little misunderstood. Some years ago I tried the whole thing in analog hardware, but the time to do so, seems to be over. So I began to think...
Dear sirs, I have a question regarding the calculation of filter taps for a FIR bandpass filter with additional phase shift of approx. 45 degrees. Background: shortwave...

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