DOUBLE TALK

DIGITAL HANDS-FREE MICROPHONE SYSTEM, AND COMPONENTS THEREFOR, SOLD INDIVIDUALLY OR AS A UNIT, FOR USE IN CONJUNCTION WITH A PUBLIC ANNOUNCEMENT SYSTEM, THE SYSTEM COMPRISING A DIGITAL HANDS-FREE MICROPHONE HAVING THE CAPABILITY OF RECORDING MESSAGES AND PLAYING BACK MESSAGES OVER THE PUBLIC ADDRESS SYSTEM, A DIGITALLY-PROGRAMMABLE AUDIO AMPLIFIER, AND, OPTIONALLY, A REMOTE CONTROL MICROPHONE ON-OFF SWITCH AND VOLUME CONTROL