| 摘要 |
<p>Electronic system (30) for sending audio messages, vocal and musical, using cards, postcards, letter-cards (10), envelopes, for mailed correspondence, flat and level objects in general, by association to said flat and level objects of a flat and level device (30) for recording and listening comprising a microphone (34), a loudspeaker (35), an integrated circuit (32) and a switch (29) which, in one position, determines connection of the analog-digital converter connected to the microphone (34) with the microprocessor and so with the flash memory and, in a second position, connection of the microprocessor and therefore of the flash memory to the digital-analog converter connected to the loudspeaker (35).</p> |
