feedback requested: digital-analog-digital lossless conversion idea

Hello everyone,

I'm new here and would like to ask for feedback advices on an idea.

Is it possible to perform digital to analog, then analog to digital conversion of a signal without any loss?
I mean the resulting digital signal should be the the same, bit-for-bit as the original one.

The plan is to connect two PC sound card and send through the data.

I know that Frequency-shift keying is doing that but I cannot use modem software, so I'm looking for a different approach, based on the sound card hardware only.

The idea is to put a high-end sound card on the sender side to fine-tune the audio signal, and put an average, low-resolution sound card on the receiver side. In this way, we might create an analog signal fine enough to go under the error-treshold of receiver low-quality sound card - thus producing an accurate digital recording.

I know it might sounds strange, this is only the first draft of my idea, any thoughts on this are appreciated.
Do you think that something like this could work in real life?

I must admit that I have little background in electronics, so it might be just a foolish idea.

Thank you.
Peter

I think that the problem must be understood as modem (modulation/demodulation), even if you are using no modulation at all. Consequently, it's performance will mainly depend on the channel parameters and the utilized modulation method.

The "no modulation" method means, that only a few symbols can be distinguished and the transmission might completely fail if signal levels aren't mapped exactly. AC coupling of the audio channel involves, that no constant symbols can be transmitted. Clock recovery has to be implemented somehow.

To utilize a significant amount of the available channel capacity, modulation methods similar to high speed modems would be needed.