I have developed a radio driver that can detect sensor RF packets for a particular protocol, in 433 MHz band using a 433 MHz receiver module like this one and also similar to this one. Before I started with the software implementation, I was given a sound card to which the receiver module was connected. I connected this sound card + receiver module to my PC- USB and was able to capture and visualize the RF packets using an audio editing software known as GoldWave-Link.
My question is: How is it possible for a sound card to detect 433 MHz RF signals, whats the principle behind it?
Another question is, on a PC sound card hardware, how do I figure out which points is the Vcc, GND and data input?. For a sound card like this one here