Time division multiple access system for transmitting an analog signal by the use of bursts without substantial interruption
First Claim
1. A time division multiple access system comprising a central station and N substations where N represents a natural number greater than one, said central station including means for transmitting a down-link succession of down-link continuous signals with N successive down-link signals being transmitted in each of a plurality of successive time frame periods of a common duration, the down-link transmission being to the respective substations, means at each of said substations for accessing said central station by N main and subsidiary signal combinations, respectively, said main and subsidiary signal combinations being received at said central station in a succession of time slot intervals, said time slot intervals being divisible into N internal interval sequences which are assigned to the respective substations with N successive ones of said time slot intervals arranged in each of said frame periods and with the intervals of one of said internal interval sequences followed by the respective intervals of another of said internal interval sequences, wherein each of said substations further comprises:
- timing pulse producing means responsive to said down-link succession for producing a sequence of timing pulses for defining the respective time positions of a particular one of said internal interval sequences that is assigned to each of said substations;
sampling pulse producing means responsive to said timing pulse sequence for producing a succession of sampling pulses with at least one sampling pulse produced within each of said time frame periods;
sampling means responsive to said sampling pulse succession for sampling a particular one of the subsidiary signals of said combinations that is to be transmitted from each of said substations, said sampling means producing a succession of sampled pulses with at least one sampled pulse produced in each of said frame periods, said sampled pulse sequence being representative of said particular subsidiary signal;
signal pulse time locating means responsive to said sampled pulse succession for locating at least one signal pulse in each time slot interval of said particular internal interval sequence by deriving the at least one sampled pulse from said sampled pulse succession to produce a sequence of signal pulses arranged in said particular internal interval sequence; and
transmitting means responsive to a particular one of the main signals of said combinations that is to be transmitted from each of said substations and to said signal pulse sequence for transmitting a sequence of up-link bursts from said substation to said central station in the respective intervals of said particular internal interval sequence, said up-link burst sequence being representative of said particular main signal and said signal pulse sequence.
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Abstract
In a time division multiple access system comprising a central station and a plurality of substations, a subsidiary analog signal is sampled at a sampling circuit of each substation M times during each frame period to produce a succession of sampled pulses. A group of M sampled pulses is located by a substation delay circuit in each up-link burst assigned to each substation. Responsive to an up-link succession including each up-link burst, the central station reproduces the sampled pulse group from each up-link burst into a reproduced group of M reproduced pulses by central station sampling pulses synchronized with the M sampled pulses. The M reproduced pulses are rearranged by a central station delay circuit into sampled pulse reproductions appearing M times in each frame period. The sampled pulse reproductions are desampled into the subsidiary signal. The number of M may be equal to or greater than one.
13 Citations
5 Claims
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1. A time division multiple access system comprising a central station and N substations where N represents a natural number greater than one, said central station including means for transmitting a down-link succession of down-link continuous signals with N successive down-link signals being transmitted in each of a plurality of successive time frame periods of a common duration, the down-link transmission being to the respective substations, means at each of said substations for accessing said central station by N main and subsidiary signal combinations, respectively, said main and subsidiary signal combinations being received at said central station in a succession of time slot intervals, said time slot intervals being divisible into N internal interval sequences which are assigned to the respective substations with N successive ones of said time slot intervals arranged in each of said frame periods and with the intervals of one of said internal interval sequences followed by the respective intervals of another of said internal interval sequences, wherein each of said substations further comprises:
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timing pulse producing means responsive to said down-link succession for producing a sequence of timing pulses for defining the respective time positions of a particular one of said internal interval sequences that is assigned to each of said substations; sampling pulse producing means responsive to said timing pulse sequence for producing a succession of sampling pulses with at least one sampling pulse produced within each of said time frame periods; sampling means responsive to said sampling pulse succession for sampling a particular one of the subsidiary signals of said combinations that is to be transmitted from each of said substations, said sampling means producing a succession of sampled pulses with at least one sampled pulse produced in each of said frame periods, said sampled pulse sequence being representative of said particular subsidiary signal; signal pulse time locating means responsive to said sampled pulse succession for locating at least one signal pulse in each time slot interval of said particular internal interval sequence by deriving the at least one sampled pulse from said sampled pulse succession to produce a sequence of signal pulses arranged in said particular internal interval sequence; and transmitting means responsive to a particular one of the main signals of said combinations that is to be transmitted from each of said substations and to said signal pulse sequence for transmitting a sequence of up-link bursts from said substation to said central station in the respective intervals of said particular internal interval sequence, said up-link burst sequence being representative of said particular main signal and said signal pulse sequence. - View Dependent Claims (2, 3, 4, 5)
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Specification