Acquisition and reconstruction techniques of automatic rate adaptation and time-data-correlation for arbitrary signal types
A process of acquiring, transmitting and reconstructing data signals is disclosed. The process includes monitoring a timing reference signal produced by a timing reference and receiving an input data signals on input/output modules. The input data signals are sampled using one of an external sample clock and an internal sample clock. The process further includes recording an input rate, based on a number of samples received during an interval, a duration count, based on the number of cycles of the timing reference signal received between the first sample and the last sample in the sample interval, and a delay count, based on a number of cycles of the timing reference signal received between a start of the interval and a first sample clock cycle of the one of the external sample clock or the internal sample clock. Data packets are created, based on sampled input data and the measured input rate, the delay count for each interval. The data packets are transmitted and subsequently received and the input data signal is reconstructed based on the data packets.
1. A process of acquiring, transmitting and reconstructing data signals, said process comprising:
monitoring a timing reference signal and a sample interval signal produced by a timing reference;
receiving an input data signal on an input/output module;
sampling the input data signal using one of an external sample clock and an internal sample clock;
measuring an input rate, based on a number of samples received during a sample interval, a duration count, based on a number of cycles of the timing reference signal between a first sample and a last sample received during the sample interval, and a delay count, based on a number of cycles of the timing reference signal received between a start of the sample interval and a first sample clock cycle of the one of the external sample clock and the internal sample clock;
creating data packets, based on sampled input data and the measured input rate, and the measured delay count for each sample interval;
transmitting the data packets;
receiving the data packets; and
reconstructing the input data signal based on the data packets.
2. A process as recited in claim 1 , wherein said step of transmitting the data packets comprises transmitting the data packets over a network and said step of receiving the data packets comprises receiving the data packets over the network.
3. A process as recited in claim 1 , wherein said step of transmitting the data packets comprises storing the data packets on a storage medium and said step of receiving the data packets comprises retrieving the data packets from the storage medium.
4. A process as recited in claim 1 , further comprising transferring the data packets to a central processing unit and said step of transmitting the data packets is performed by the central processing unit.
5. A process as recited in claim 1 , wherein said step of monitoring a timing reference signal produced by a timing reference comprises monitoring the timing reference signal and an end of interval signal produced by the timing reference.
6. A process of processing data signals, said process comprising:
monitoring a timing reference signal produced by a timing reference;
receiving input data signals on input/output modules;
sampling the input data signals using one of an external sample clock and an internal sample clock;
measuring an input rate, based on a number of samples received during a sample interval, a duration count, based on a number of cycles of the timing reference signal between a first sample and a last sample received during the sample interval, and a delay count, based on a number of cycles of the timing reference signal received between a start of the sample interval and a first sample clock cycle of the one of the external sample clock and the internal sample clock;
creating data packets, based on sampled input data and the measured input rate, and the measured delay count for each sample interval.
7. A process as recited in claim 6 , further comprising transmitting the data packets over a network.
8. A process as recited in claim 6 , further comprising storing the data packets on a storage medium.
9. A process as recited in claim 6 , further comprising transferring the data packets to a central processing unit and said step of transmitting the data packets is performed by the central processing unit.
10. A process as recited in claim 6 , wherein said step of monitoring a timing reference signal produced by a timing reference comprises monitoring the timing reference signal and an end of interval signal produced by the timing reference.
11. A process of reconstructing data signals, said process comprising:
receiving data packets;
retrieving an input rate, based on a number of samples acquired during a sample interval in an original data signal, a duration count, based on a number of cycles of a timing reference signal received between a first sample clock and a last sample clock in the sample interval, and a delay count, based on a number of cycles of the timing reference signal received between a start of the interval and a first sample clock cycle of a sample clock in the original data signal;
determining a measured data rate and a phase offset for the original data signal, based on sampled input data and the input rate, the duration count and the delay count for each interval; and
reconstructing the original data signal based on input data contained in the data packets and the determined measured data rate and phase offset.
12. A process as recited in claim 11 , wherein said step receiving data packets comprises receiving data packets over a network.
13. A process as recited in claim 11 , wherein said step receiving data packets comprises retrieving data packets from a storage medium.
14. A process as recited in claim 11 , wherein said step of determining a measured data rate and a phase offset for the original data signal comprises providing a direct digital synthesizer with rate control data, receiving a reconstructed clock signal from the direct digital synthesizer and determining the measured data rate and the phase offset for the original data signal based on sampled input data and the input rate, the duration count, the delay count for each interval and the reconstructed clock signal.
15. A system for acquiring, distributing and reconstructing data signals, said system comprising:
input/output modules, sending and receiving data signals and sample clock signals;
a timing reference, providing a reference clock signal and an end of interval signal to each of the input/output modules;
a central processing unit, sending and receiving data packets to and from the input/output modules; and
a data packet interface in communication with the central processing unit, for sending and receiving data packet to and from at least one of a network and a data storage medium;
wherein input/output modules are configured to create data packets based on sampled input data and an input rate, a duration count and a delay count for each interval of the data signals and are configured to reconstruct an original data signal based on input data contained in the data packets and a measured data rate and a determined phase offset.
16. A system as recited in claim 15 , wherein each input/output module of said input/output modules comprises a signal acquisition unit and a signal reconstruction unit, wherein the signal acquisition unit receives data signals, the reference clock signal and the end of interval signal and outputs data packets, and wherein the signal reconstruction unit receives data packets, the reference clock signal and the end of interval signal and outputs the original data signal.
17. A system as recited in claim 16 , wherein each input/output module of said input/output modules further comprises a direct digital synthesizer, wherein the direct digital synthesizer receives a rate control signal from the signal reconstruction unit and provides a reconstructed clock signal to the signal reconstruction unit.
18. A system as recited in claim 15 , wherein said step receiving data packets comprises retrieving data packets from a storage medium.