It is mostly a semantic difference. The easy part is the software 
defined radio. In simple terms it is a radio where the demodulation 
capability and other receive parameters is done in software. In some 
cases the software is closer to firmware but none the less software. A 
software defined radio can be programmed to receive many modes, both 
analog and digital.

A digital radio could be almost anything in some circles,  starting with 
an analog receiver with digital tuning. To be more realistic one could 
say it is a radio that receives one or more digital transmission modes. 
Most digital radios that meet that definition are also software defined 
radios so we get back to it being a matter of semantics.



Adnan Yusuf wrote:
> What is the difference between a software defined radio and a digital 
> radio? I am working on an SDR project and I keep getting asked this 
> question. 
> 
> Thanks
> 
> yours
> adnan yusuf
> 
> 

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