-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi 猪猪猪猪猪猪头,
you've replied to the wrong thread; however: dB is *always* a relative measure. You can't output dB; it always has to be dB in relation to something. The parameter of the noise source is amplitude. Like Martin, if I *want* to stick a physical entity to it, it would be voltage. Usually, I don't -- the noise source just outputs a realization of a complex random process; it's just numbers without unit. I'm under the impression you're mixing up absolute noise power, noise variance, and SNR; for SNR, which is a ratio, dB does indeed make sense. However, you don't get a noise source that generates a certain SNR, because that depends on the signal power, and is something that you/your application has to calculate. Greetings, Marcus > hi ,Martin Braun well ,in my impression, the unit of is noisy is > dB,so i feel fuzzy about the volt, > thanks for your reply! > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJTTQRbAAoJEBQ6EdjyzlHtxuAH/ieCgneEsA7ET+lUl28SEhXq AaMa0Zv0Idrg4FKOudkDeydcUVL6sTPwAkEKjVxfdQ1bkDJp2gWg2IPMd1KadQI4 I46YLa5tIx44dRD481BXg+MCSHibYzwvqNdGzX5bB2YXUFSMN7SWq9kZm70074Wx 3yRMPxC+r7bISuN66m10NrcElo7eFsB+6dpNNoOITCwIe7xrhLfGUJ4H4TNp2LQM EUki7ELRO6lgz7vHKdjkrTUPb2i9JhRIuCd6gZlfgz/1qms8n6pUxLVoQj2dRS7Q 7R6cEvwd8tLuwt6h9BIuK0twttYXRqedpHxgSyqGcNopLQHFg7IeIlSqAZideYM= =9w3p -----END PGP SIGNATURE----- _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
