For all the practicing engineers out there:
- Where have you encountered a negative SNR?
- How negative, in dB, was it or estimated to be?
- Where would you expect to encounter a negative SNR?
Note: I am also counting interference signals as noise, so SNR can also include SIR.
In my own experience, I have seen negative SNRs in car communications. There is road noise, as well as multi-talker and music interference. I have also seen it in the output from cellular phones. Wind noise can sometimes pose a significant problem there, as well as the myriad of interferences in speakerphone mode.
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