Artlav
Full Member level 2
In short, how do you decode AM signal from I/Q samples into sound?
In details, i made an SDR that uses a PC sound card as ADC.
The local oscillator on it is set to 700KHz, there is a radio station at 731KHz.
With existing software i verified that the hardware works - the station is here and i can hear it.
Now, the goal is to make my own SDR software.
I can read the I/Q signals, at 96K samples, into a program on a PC.
When i do FFT on them, i see the target station at 31KHz in there.
And that's where i ran out of knowledge.
There is a lot of info on the net on how to make SDR hardware, but i wasn't able to find anything on how to make SDR software.
So, i have two sets of numbers that are I/Q samples, 96000 of them per second, and a frequency of the station.
How do i get sound out of them?
Where to begin, what names to google for, what to read?
In details, i made an SDR that uses a PC sound card as ADC.
The local oscillator on it is set to 700KHz, there is a radio station at 731KHz.
With existing software i verified that the hardware works - the station is here and i can hear it.
Now, the goal is to make my own SDR software.
I can read the I/Q signals, at 96K samples, into a program on a PC.
When i do FFT on them, i see the target station at 31KHz in there.
And that's where i ran out of knowledge.
There is a lot of info on the net on how to make SDR hardware, but i wasn't able to find anything on how to make SDR software.
So, i have two sets of numbers that are I/Q samples, 96000 of them per second, and a frequency of the station.
How do i get sound out of them?
Where to begin, what names to google for, what to read?