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Transmitter-apparatus-for-an-information-transmission-system

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Transmitter apparatus for an information transmission system

Details

Inventors: Davis, Christopher K.; Mitchell, Richard F.;
Assignee: U.S. Philips Corporation (New York, NY)
Primary Examiner: Yusko; Donald J.
Assistant Examiner:
Attorney, Agent or Firm: Briody; Thomas A., Streeter; William J., Goodman; Edward W.

In order to form a first-come first-served queue in an information transmission system employing a common transmission channel when several transmitters of the system try to gain access to the channel when it is already occupied, without employing a further transmission channel to a point at which an account is kept of the order in which the various transmitters request access, each transmitter which tries to gain access in these circumstances is caused to delay after the channel subsequently free before it actually accesses the channel, this delay being inversely proportional to the time the corresponding transmitter has waited. Thus the transmitter which has waited the longest gains the channel first and causes the other waiting transmitters to continue to wait.

DETAILED DESCRIPTION We claim: 1.
Transmitter apparatus for an information transmission system, which system comprises at least two such apparatuses having their outputs coupled to a common transmission path, said apparatus comprising a transmitter, an indicator circuit for generating an output signal indicative of whether or not the transmission path is in use, and a control circuit having an input for a transmit-request signal, the output of said indicator circuit being coupled to said control circuit and said control circuit having an output thereof, which output is coupled to a control input of said transmitter, for providing a transmission activation signal for said transmitter in response to the application of a transmit-request signal to the control circuit input, the instant of generator of said activation signal being dependent on the output of said indicator circuit whereby, if said indicator circuit is indicating that the transmission path is in use when the transmit-request signal is applied to the control circuit input, said activation signal will be generated at an instant which occurs a predetermined time interval after the indicator circuit subsequently indicates that the transmission path has become clear, and only then provided that the indicator circuit is then indicating that the transmission path is clear, characterised in that the control circuit comprises means for varying said predetermined time interval inversely with respect to the time which elapses between the application of said transmit-request signal to said input and the subsequent indication by the indicator circuit that the transmission path has become clear.
2.
Apparatus as claimed in claim 1, characterized in that the control circuit further comprises means for generating at its output a transmission activation signal for the transmitter substantially immediately in response to the application of a transmit-request signal to its input if the indicator circuit is indicating that the transmission path is clear when the transmit-request signal is applied to the control circuit input

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