Apparatus and method for transmitting messages between a plurality of subscriber stations
First Claim
1. A method for transmitting information between a plurality of subscriber stations using selected modulated carrier frequencies, comprising the steps of:
- forming a transmission chain of all participating subscriber stations;
establishing a connection for a simultaneous communication between at least three of the subscriber stations;
supplying all of the subscriber stations, except for a first subscriber station, with a user signal of a preceding subscriber station in the transmission chain;
adding in each subscriber station the user signal of the proceeding subscriber station to produce a compound signal;
forwarding the compound signal to a subscriber station that is next on the transmission chain, wherein the compound signal that is generated in a last subscriber station of the transmission chain is supplied to all subscriber stations participating in the simultaneous communication connection; and
transmitting compound user signals, between the subscriber stations, and the compound signal, generated in the last subscriber station and supplied to all the subscriber stations, on an available selected carrier frequency that is different for each compound signal.
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Accused Products
Abstract
A method and apparatus for conducting a conference call among a plurality of subscriber stations. Each subscriber station contains a transmitter, a receiver, and an auxiliary receiver. An output of the auxiliary receiver can be selectively connected to an adding member that is located between a microphone and an input of the transmitter. The subscriber stations establishing the conference call connection form a transmission chain. Each subscriber station involved in the conference call, with the exception of the first subscriber station on the transmission chain, receive a user signal of a preceding subscriber station. The user signal of the preceding subscriber station is added to its own user signal to produce a compound signal that is transmitted to the next subscriber station on the transmission chain. A compound signal created in the last subscriber station of the transmission chain is supplied to the receiver of all the subscriber stations on the transmission chain. Each subscriber station can also function as a transition station to permit the making of a conference call to subscriber stations located on another transmission network. Various transmission mediums, such as a wireless system or a line-guided system, can be employed. If a line-guided transmission system is used, the transmitters and receivers of the subscriber stations are inductively coupled to the line.
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Citations
33 Claims
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1. A method for transmitting information between a plurality of subscriber stations using selected modulated carrier frequencies, comprising the steps of:
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forming a transmission chain of all participating subscriber stations; establishing a connection for a simultaneous communication between at least three of the subscriber stations; supplying all of the subscriber stations, except for a first subscriber station, with a user signal of a preceding subscriber station in the transmission chain; adding in each subscriber station the user signal of the proceeding subscriber station to produce a compound signal; forwarding the compound signal to a subscriber station that is next on the transmission chain, wherein the compound signal that is generated in a last subscriber station of the transmission chain is supplied to all subscriber stations participating in the simultaneous communication connection; and transmitting compound user signals, between the subscriber stations, and the compound signal, generated in the last subscriber station and supplied to all the subscriber stations, on an available selected carrier frequency that is different for each compound signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for transmitting messages on a network that permits at least three stations to participate in a conference communication, comprising the steps of:
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modulating a first carrier signal by a user signal of a first subscriber station; transmitting the modulated first carrier signal to a second subscriber station; demodulating the transmitted modulated first carrier signal at the second subscriber station so that an unmodulated base band signal is produced, a user signal of the second subscriber station being added to the base band signal so as to produce a compound user signal; modulating a second carrier signal that differs from the first carrier signal by the compound user signal; transmitting the modulated second carrier signal to a conference leader subscriber station; and demodulating the transmitted modulated second carrier signal at the conference leader subscriber station so as to produce a demodulated compound user signal, a user signal of the conference leader subscriber station being added to the demodulated compound user signal so as to produce a new compound user signal, the new compound user signal modulating a third carrier signal and being transmitted to the conference participating stations, the third carrier signal differing from the first and second carrier signals. - View Dependent Claims (21, 22)
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23. A subscriber station for exchanging communications on a transmission chain, having at least three subscriber stations, in which one of said at least three subscriber stations that initiates a conference communication between said at least three subscriber stations acts as a conference leader station, comprising:
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a transmitter for modulating a carrier signal by a speech signal; means for placing said modulated carrier signal onto said transmission chain; a receiver for receiving modulated carrier signals intended for said subscriber station that are placed on said transmission chain; and a further receiver for receiving a carrier signal modulated by a compound signal, said compound signal being generated in said conference leader station and being used to interconnect said at least three subscriber stations so that a conference communication can occur.
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24. A method for transmitting information between a plurality of subscriber stations that communicate using a plurality of modulated carrier frequencies, comprising the steps of:
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establishing a connection for a simultaneous communication between at least three of the subscriber stations; supplying all of the subscriber stations, except for a first subscriber station, with a user signal of a preceding subscriber station; adding in each subscriber station the user signal of the preceding subscriber station to the user signal of said each subscriber station to produce a compound signal; forwarding the compound signal to a subscriber station that is next on a transmission chain, wherein the compound signal that is generated in a last subscriber station of the transmission chain is supplied to all subscriber stations participating in the simultaneous communication connection; and transmitting compound user signals, between the subscriber stations, and the compound signal, generated in the last subscriber station and supplied to all the subscriber stations, each on a selected highest respectively lowest available usable carrier frequency. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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33. A method for adding an outside station of a second network to a communication chain involving at least a conference leader station and a first subscriber station, both of which are located on a first network, comprising the steps of:
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establishing a callback connection as a communication link between the conference leader station and the outside station via network transition stations while putting the first subscriber station on hold; enabling the outside station and the first subscriber station to transmit a user signal to the network transition station of the first network which sends a corresponding compound signal to an auxiliary receiver of the conference leader station; and enabling the outside station and the first subscriber station to receive a compound signal transmitted by the conference leader station, said compound signal comprising the user signals of all stations, such that the conference leader station, the outside station and the first subscriber station form a new communication chain.
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Specification