Software engineer and wannabe RF/DSP guru.

Machine learning and detection in noise

New thread started 3 years ago
I've been tinkering with a problem involving detecting a set of tones in the presence of noise. I've looked at Goertzl and matched filter approaches, but I've had...

Re: Differential frequency measurement

Reply posted 4 years ago (10/11/2017)
Hi artmez:The signal generation is definitely out of my control. The detection design is what I am focused on. Other designs for this system that use an (external)...

Re: Differential frequency measurement

Reply posted 4 years ago (10/08/2017)
Hi artmez:The real problem with frequency accuracy in this system is that it is designed to use AM modulation over HF radio links, but in this case, the receiver...

Re: Differential frequency measurement

Reply posted 4 years ago (10/07/2017)
Hello Ced:1. Just like DTMF, there are two tones in each period2. The tones are transmitted with good precison (< 0.1% in frequency), but are subject to phase/frequency...

Re: Differential frequency measurement

Reply posted 4 years ago (10/06/2017)
Thank you John. Yes, in this case the transmitted tone frequencies (and hence the differences between them) are known a priori. What is not known is the precise...

Differential frequency measurement

New thread started 4 years ago
Hi all:Can anyone suggest a good way of doing DTMF-like tone detection by determining the (known) frequency difference between limited time duration tone-pairs?...

Re: Processing block size and matched filtering

Reply posted 5 years ago (08/26/2016)
To answer lamabrew's questions:1. The noise has, AFAIK, a combination of Gaussian and Bi-Kappa distributions (HF radio channel)2. The signal is very much like telephone...

Re: Processing block size and matched filtering

Reply posted 5 years ago (06/15/2016)
To answer some of Tim's questions about this case:- About all we know about the tones is their (approximate) frequency and allowed duration. We do not know their...

Processing block size and matched filtering

New thread started 5 years ago
I have a set of conflicting requirements:- I need to detect weak tones in noise- I need to qualify the presence (and absence) of these tones based on their duration...

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