Pulse or digital communications – Multilevel
Patent
1995-09-05
1998-03-31
Chin, Stephen
Pulse or digital communications
Multilevel
375288, 375289, 341 57, 341 61, H04L 2534
Patent
active
057346828
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is dealing with a process to transmit information over an electrical support. It deals more specifically with the transmission of digital information flowing serially in a time sequence over the support.
2. Brief Description of the Background of the Invention Including Prior Art
It is known from a long time to transmit information in serial sequence over an electrical support with various methods. It is known for instance processes and systems to transmit information between musical instruments according to the MIDI (Musical Instruments Digital Interface) interface standard. Frequently, according to the coding of the information peculiar to the transmission process considered, it is not uncommon to be limited by the amount of various distinct coded messages which the transmission process can pass along over the support. In the case of the MIDI standard, for instance, one quickly comes up against the absolute limit of 16 addresses (also called channels) of various distinct instruments which the system is able to cope with.
SUMMARY OF THE INVENTION
1. Purposes of the Invention
The invention aims to remedy the drawbacks of the known processes by offering a process which allows to increase the amount of various distinct messages the system is able to convey while maintaining the compatibility with existing systems.
These and other objects and advantages of the present invention will become evident from the description which follows.
2. Brief Description of the Invention
To this end, the invention deals with a process for the transmission of a larger quantity of information between at least two devices according to which the elements of information which are succeeding each others in time are passed along over an electrical support, said information elements being made of a packet of binary transitions forming messages which comprise one or more data and/or addresses of the devices for which these data are intended, while said process does not increase the amount of transitions flowing over the support and allows nevertheless to increase the amount of various distinct messages the system is able to convey. According to the invention, the off-state of the binary transitions is used in order to possibly generate symmetrical transitions of the active state of the binary transitions with regard to their off-state in order to enrich the content of the message by replacing the two-state logic of at least one binary transition able to take the off-state by a three-state logic.
By information, it is intended to designate any message in which the semantic content may be coded.
According to the invention, devices are information transmitters, information receivers, or combined information transmitters and receivers (transceivers).
According to the invention, the information elements are succeeding each others in time over an electrical support. By succeeding each others, we intend to define a transmission of the information elements one by one in a time sequence, any element using alone the whole information capacity of the support. By electric support, we mean any mean able to convey an electrical signal from a point to another. Those supports will be mostly realized by means of one or more electric conductors under the form of one or more wires isolated between them and assembled in a cable terminated by connectors. The coding of information over the electric support can be done by any known way. It may, for instance, be realized by means of a voltage, of a current, of a phase or of any other way compatible with the support.
According to the invention, the information elements are made of a set of binary and ternary transitions succeeding each others in time. When the coding of the information is done by means of a voltage, a binary transition is performed by a sudden jump from the rest-voltage to the on-voltage (active state) or else from the on-voltage to the rest-voltage. Things go similar when the coding is realized through other means. Sets of
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Chin Stephen
Kasper Horst M.
Le Amanda T.
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