System and method for establishing a subsampling rate for repetitive signals
AssigneeAgilent Technologies, Inc.
InventorMichael J. Weinstein
Life of this patent
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Abstract
The present invention is directed to a system and method which expands the applicability of subsampling to a larger range of signal repetition rates while reducing the range over which the sample rate must be tuned to accommodate a given signal. The resulting sample sequences are in the correct order, enabling direct display with an ordinary oscilloscope or other instrumentation. In one embodiment, a technique is used such that decimation of the samples also improves the response characteristics of the sensor. The system and method provides for a number of different procedures for sampling a signal of a given length. All other parameters being the same, the system allows more freedom in selecting the sample rate to correctly sub-sample a repetitive signal.
Claims20
The method of sampling a repetitive signal having a data rate Fb comprising:
- selecting a sample frequency Fs, where 1/Fs is the time elapsed between samples (sec);
- selecting decimation parameter n so that after some number of samples n, the equivalent sample point has advanced by exactly Δ seconds;
- and
- decimating said repetitive signal by said decimation parameter n, where the time elapsed during n samples (n/Fs) is constrained to be equal to the time elapsed during m repetitions of the signal, plus Δ seconds, where m is the pattern repetitions between decimated samples.
A system for displaying a repetitive signal on a display, said signal having any repetition rate, including repetition rates which require storing and reordering prior to presentation to said display, said system comprising:
- means for establishing a signal sampling clock rate;
- means for sampling said repetitive signal under control of said clock rate;
- and
- means for decimating said sampled repetitive signal to achieve, without storage, a correctly ordered sample sequence for presentation to said display.
A method for displaying a repetitive signal on a display, said signal having any repetition rate, including repetition rates which require storing and reordering prior to presentation to said display, said method comprising the steps of:
- establishing a signal sampling clock rule;
- sampling said repetitive signal under control of said clock rule;
- decimating said sampled repetitive signal to achieve, without storage, a correctly ordered sample sequence for presentation to said display;
- and
- presenting said correctly ordered sample sequence to an input of said display.
Dependencies are inferred from the claim text.