MatLab data acquisition using soundcard

[cronxeh]

Has anyone ever tried acquiring an image using the microphone input on the soundcard? I take it you have 2 analog channels (left, right), 44.1 kSamples/second bandwidth, 16 bit, with frequency range of 20 Hz - 20,000 Hz. Is there a way to acquire an image from a 640x480 pinhole camera (or 320x240) via the mic input using composite cable

 

[Cvan]

I know it is possible to solder up a photocell to a mic jack and use it in your microphone input (assuming the input voltage of the photo cell is not>>the rated voltage your sound card is designed to handle, so you don't blow up your card). Then you can record the data in some oscilloscope program and export it to a text file; then process that data in MATLAB.

As for processing *video* as an input; I have no experience in the matter, sorry.

 

[oswaler]

There are certainly ways to acquire an image using the microphone input on a soundcard, although it may not be the most ideal method. The soundcard's microphone input is designed to capture audio signals, not visual signals, so the quality and resolution of the resulting image may not be optimal.

To acquire an image from a 640x480 or 320x240 pinhole camera via the mic input, you would need to use a composite cable to connect the camera to the soundcard. This would allow the visual signal from the camera to be converted into an audio signal that can be captured by the soundcard.

However, there are a few limitations to keep in mind when using this method. Firstly, the soundcard's bandwidth of 44.1 kSamples/second may not be sufficient to accurately capture the visual information from the camera. Additionally, the soundcard's 16-bit resolution may not provide enough detail for a high-quality image. And finally, the frequency range of 20 Hz - 20,000 Hz may not be wide enough to capture all the visual information from the camera.

Overall, while it is possible to acquire an image using the microphone input on a soundcard, it may not be the most reliable or accurate method. It would be more beneficial to use a dedicated image acquisition device that is specifically designed for capturing visual signals.