Patent ID: 7796565

Claim:
A method of exchanging analog signals and a digital data among at least two transmitters and at least one receiver in a teleconferencing system, the method comprising: by a first transmitter, generating a first CDMA chip sequence; combining a first digital bit stream and the first CDMA chip sequence, to form a first spread spectrum sequence; modulating the first spread spectrum sequence onto a first analog signal, to form a first modulated signal; transmitting the first modulated signal to the receiver via a first communication channel; by a second transmitter, generating a second CDMA chip sequence; combining a second digital bit stream and the second CDMA chip sequence, to form a second spread spectrum sequence; modulating the second spread spectrum sequence onto a second analog signal, to form a second modulated signal; and transmitting the second modulated signal to the receiver via a second communication channel; wherein the first CDMA chip sequence is different from the second CDMA chip sequence; wherein generating the first CDMA chip sequence comprises periodically pseudo-randomly selecting the first CDMA chip sequence from one of a plurality of chip sequence generators, and by the at least one receiver, demodulating a received signal, to produce a demodulated signal; generating a third CDMA chip sequence; generating a fourth CDMA chip sequence; multiplying the demodulated signal by the third CDMA chip sequence, to reconstruct the first digital bit stream; and multiplying the demodulated signal by the fourth CDMA chip sequence, to reconstruct the second digital bit stream; wherein the third CDMA chip sequence is different from the fourth CDMA chip sequence.