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Re: [Discuss-gnuradio] Noisy source block
From: |
Martin Braun |
Subject: |
Re: [Discuss-gnuradio] Noisy source block |
Date: |
Tue, 15 Apr 2014 10:31:07 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 |
On 04/15/2014 04:46 AM, 猪猪猪猪猪猪头 wrote:
> hi,guys
> why the unit of amplitude in Noisy source block is volt?
> how to explain this ?
> thanks,
> BZS
Not sure what your question is. Signal amplitudes are usually in Volts,
that's just the right physical unit.
I assume you're asking because in the digital domain, there's really no
volts, and that's a good point. The unit could also just be 1. This is
something you sometimes see in (especially older) DSP textbooks.
There's a similar thing, where the mag-square of a signal is often
considered its instantaneous power (which, would assume a resistance of
1 \Ohm if you're still thinking in physical power).
So, just ignore this if it confuses you.
Martin