1. A computer-implemented method for filtering ambiguous tokens, comprising: receiving, from a computing device, a token previously communicated or generated according to a communication modality; calculating a distance metric value for the received token, where the distance metric value represents a comparative distinction of the received token according to a modality type; comparing the calculated distance metric with a predetermined ambiguity threshold value; and outputting token data including the received token when the distance metric value calculated is at least as great as the ambiguity threshold; otherwise, outputting the token data including a partial received token corresponding to a portion of the received token that is at least as great as the ambiguity threshold.