Time division multiplex transmission of submultiplex sequences of signals from sections of a chain of data acquisition units
First Claim
1. In a telemetry system having a plurality of sections at which data is time division multiplexed and transmitted to a receiving point, the improvement comprising means for each of said sections for generating a sequence of time slots for transmissions of signals from all of said sections, means for each of said sections responsive to the reception of signals from a preceding section for synchronizing said time slots generated therein, with the time slot sequence of said preceding section in the sequence in which said sections are connected to each other, and means in each of said sections for the transmission of signals therefrom and from said preceding section or sections in time division multiplex relationship in different ones of said time slots.
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Accused Products
Abstract
Time Division Multiplex (TDM) telemetry of submultiplex sequences of signals which may be obtained from successive sections of sensors in a sensor array are transmitted synchronously by locking generators in each section, which determine the time slots in which samples of the sensor signals from each sensor in the array may be transmitted, to successive synchronizing pulses which are generated in the section of the array furthest from the head end of the array where the telemetered signals are received. The synchronizing signals are transmitted once per scan of all of the sensors in the array and phase or time the operation of clock generators and counters which establish the timing so that neither the time slots nor the sensor data signals which are transmitted therein to the collection point at the head end of the array interfere with one another. The sensor array may be a seismic array such as a seismic streamer or spread used in geophysical exploration. Data signals from groups of sensors associated with different data acquisition units of a chain of such units may also be telemetered in synchronous sequences during repetitive scans or frames. Each section or module of the system may be identical and can provide the synchronizing pulses to succeeding section if a preceding unit fails to provide the synchronizing signals.
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Citations
15 Claims
- 1. In a telemetry system having a plurality of sections at which data is time division multiplexed and transmitted to a receiving point, the improvement comprising means for each of said sections for generating a sequence of time slots for transmissions of signals from all of said sections, means for each of said sections responsive to the reception of signals from a preceding section for synchronizing said time slots generated therein, with the time slot sequence of said preceding section in the sequence in which said sections are connected to each other, and means in each of said sections for the transmission of signals therefrom and from said preceding section or sections in time division multiplex relationship in different ones of said time slots.
Specification