Is this even possible? (~7 second audio delay)

i'm affiliated rather poor non-profit radio station. in our main studio, have digital 7 second broadcast delay setup, if drops profanity on air, can hit dump button , keep either last 3.5 or 7 seconds being broadcast. in our remote studio half mile away, however, don't have sort of trigger system, have have sitting near dump button @ main studio times. don't have manpower, nor time that. i'm wondering if there way arduino (or multiple arduinos) or similar setup input 80hz-14khz audio signal, buffer 7 seconds, , output it. things need have other button took signal buffer , dumped memory, , started buffering delay again. reason i'm asking cheapest can find digital, professionally-made, dedicated delay setup around $700. our budget doesn't cover kind of expense, after having 3 of our 4 $300 marantz reporter-recorders "walk off" on in last several months.  

could several boards?

time bit of math.  according nyquist, you'll need 14,000 * 2 samples per second = 28,000 samples per second.  about lowest resolution you'd want consider 12 bits per sample gives 336,000 bits per second or 42,000 bytes per second.  i believe maximum memory available on avr processor 64k.  you may able buffer 1.5 seconds.  so, you'll have consider solution external memory.  

you'll need external dac (available shield) , may need external adc.

still interested?

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