Patent ID: 6236724
Filing Date: 2001-05-22
Classification: H04M

Abstract:
A method for encoding and decoding data carried by a plurality of signals transmitted from a portable acoustic signal generator to a destination unit through the use of transmission equipment, wherein the signals are acoustical for at least a portion of the transmission path, the method comprising the steps of:generating, via the signal generator, a plurality of time ordered acoustic signals spaced apart in a pre-determined time window sequence, wherein the plurality of time ordered acoustic signals comprises at least two data characters acoustically encoded;removably coupling the signal generator to a microphone associated with the transmission equipment such that the plurality of acoustic signals is received by the microphone;transmitting the plurality of signals over the transmission equipment;detecting, by the destination unit, the plurality of signals;determining, by the destination unit, a plurality of time ordered time slots for each of the signals; andanalyzing, by the destination unit, each of the time ordered time slots to derive the data character originally encoded in the acoustical signal generator.