Steve is right: the two types of signal are different and there is no splicable solution....Assuming that its not some proprietary format, with some help, it can be done with dedicated circuitry to convert an analog (RCA) signal to a digital one. (USB). You should be able to buy an RCA to headphone jack cable, and then a USB microphone with an audio in input. ($3 dollars for cables off amazon + $20 for a mic. http://www.amazon.com/Griffin-Technology-iMic-Audio-Device/dp/B000BVV2IC/ref=sr_1_1?s=electronics&ie=UTF8&qid=1358715231&sr=1-1&keywords=USB+microphone+line+in & cable like http://www.amazon.com/3-5mm-Stereo-Female-Cable-inches/dp/B0018MI5F6/ref=sr_1_10?ie=UTF8&qid=1358715461&sr=8-10&keywords=RCA+cable+convert ). You may be able to do better pricing. These are just the first I saw...Alternatively, you might have a microphone jack on you computer and be able to use the above mentioned converter cable, bypassing USB entirely.Good luck.
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And a followup to myself...I use the cable directly to computer to run from a tape players signal out. Ie if the source is just the component inter connects between systems, you shouldn't have problems.If you are plugging into an amplified rca source (speaker out on a large stereo or amplifier) check to make sure that the microphone is rated for the signal. May not be an issue, but better safe than sorry.
RCA is audio analog single signal on two wires. USB is high speed digital serial bi-directional data. Audio can be converted to digital using an ADC and a dedicated uP to stream it over a USB cable to a PC or a smart DAC recovering the digital stream into an audio signal amplified for a speaker making the audio you humanoids are able to perceive. A
Not at all. USB is NOT the same as ordinary You have to have an interface between the two systems.