Patent ID: 7286498
Filing Date: 2007-10-23
Classification: G09B

Abstract:
1. In wireless remote units for transmission of audience response data to a central processor, a communications method comprising the steps of: retrieving remote ID data of at least 8 bits from remote unit memory; retrieving participant data of at least 3 bits from remote unit memory; forming a set of at least 2 transmission data groups, each of at least 4 bits from all retrieved bits of data in a manner that prevents sequences of consecutive bits in retrieved data from appearing as a transmission data group; including at least one marker bit in each transmission data group; forming a checksum data group of at least 2 bits by binary calculation from said set of at least 2 transmission data groups; forming a first data packet from a series of said transmission data groups and said checksum data group; transmitting said first data packet.