Hello. I'm new here, and I want to do a little project for fun but I'm not too experienced with some of the components of the project. I was hoping that I could get some help/suggestions on what to do:
I want to make a walkie-talkie like device. I want a transmitter that will take AtoD signals from a microphone + amplifier into a pic (18f1320), which I plan to sample at 8000 times a second. Then, the pic will send the AtoD data serially through a RF transmitter.
The reciever will have a RF reciever, which will be connected to a pic. It will then use a R-2R resistor ladder to create an analogue signal, which will be sent to an amplifier and speaker.
Now I have a few problems that I need to work out. The first of which is speed. I've browsed around on some past posts and other places online and I found that a AtoD sample rate of 8K is phone quality sound. I do not know if this is true or not, so I need some confirmation on that. Also, what would it take to do mp3 quality sound?
I also need some sort of RF transmitter and reciever. I have no knowledge about how to make these, I tried this one once for another project and it didn't work at all for me:
I also have some RF transmitters and receivers from sparkfun that can do 4800bps, but that is not fast enough to transmit 8K*10bits per second. So I need a module that can do 80K bps. I don't know of these things exist or not, but I'm hoping that they do.
The amplifying parts I think I would be able to do. I have a little experience with opamps, and I can just use a capacitor as my low pass filter.
I was hoping to keep the digital part of the project since I can apply it to something else I'm working on.
Thanks for your time!
I want to make a walkie-talkie like device. I want a transmitter that will take AtoD signals from a microphone + amplifier into a pic (18f1320), which I plan to sample at 8000 times a second. Then, the pic will send the AtoD data serially through a RF transmitter.
The reciever will have a RF reciever, which will be connected to a pic. It will then use a R-2R resistor ladder to create an analogue signal, which will be sent to an amplifier and speaker.
Now I have a few problems that I need to work out. The first of which is speed. I've browsed around on some past posts and other places online and I found that a AtoD sample rate of 8K is phone quality sound. I do not know if this is true or not, so I need some confirmation on that. Also, what would it take to do mp3 quality sound?
I also need some sort of RF transmitter and reciever. I have no knowledge about how to make these, I tried this one once for another project and it didn't work at all for me:
I also have some RF transmitters and receivers from sparkfun that can do 4800bps, but that is not fast enough to transmit 8K*10bits per second. So I need a module that can do 80K bps. I don't know of these things exist or not, but I'm hoping that they do.
The amplifying parts I think I would be able to do. I have a little experience with opamps, and I can just use a capacitor as my low pass filter.
I was hoping to keep the digital part of the project since I can apply it to something else I'm working on.
Thanks for your time!