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POInput from 20+ microphones
 

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    <p>I've been asked (if it's possible) to write a program monitoring the input of at least 20 microphones, on a single computer.</p> <p>Currently I'm prototyping in python (2.6), on a Ubuntu system using Alsa. My attempts so far have created quite a few questions...</p> <p>Ubuntu is a requirement, Alsa isn't, and python is an ideal.</p> <p>For hardware, one suggestion is multiple sound cards. The other is a series of usb hubs and microphone adaptors (like <a href="http://www.aliexpress.com/product-fm/311098204-Headset-Adapter-100pcs-lot-USB-3d-Audio-Sound-Card-Microphone-wholesalers.html" rel="noreferrer">these</a>) (In which case the devices would all be identical and on the same USB bus)</p> <p><strong>Questions:</strong></p> <p>How can I simultaneously record multiple microphones from a single sound card? (e.g. using line-in as well as mic, bonus for anyone who know how I can use more than just two inputs!)</p> <p>In the USB setup, how can I identify which position a sound card (usb adapter) in plugged in to a USB hub (or chain of USB hubs).</p> <p>If a solution is raw access to the microphones via USB, is a devices position on a usb bus depend only on which port on a USB hub they are plugged into, or do could it change between powering the computer on and off?</p> <p>Last, if using raw access, how do I best get the data (no current experience with pyUSB) and what conversion (if any) is required from raw -> audio?</p> <p><strong>Edit:</strong></p> <p>By monitor, I've been asked to record input to disk (ideally above a set threshold, which the speex codec looks ideal for), monitor volume levels, provide graphic feedback and set up at least one output that cycles through all active microphones.</p> <p>Python isn't a long term requirement, just the easiest way I've found so far to get the PCM data from a sound card (microphone only however)</p> <p>I am intending to have the polling of the soundcards and data processing take place in separate threads, an area that I haven't got much experience with.</p> <p>Where would I find more information on implementing a USB audio class driver?</p>
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    1. CO"Python isn't a long term requirement, just the easiest way I've found so far to get the PCM data from a sound card" Really? Using what?
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