Superposed signal sampling apparatus and sampling method

• US 9,935,796 B2
• Filed: 02/13/2015
• Issued: 04/03/2018
• Est. Priority Date: 03/13/2014
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (GE Vernova, Inc.)
• Original Assignee: General Electric Company
• Inventors: Wang, Lifeng, Wu, Xiaojie, Yang, Xianhong
• Primary Examiner(s): Ahn, Sam K
• Assistant Examiner(s): Hassan, Sarah
• Application Number:
  US15/122,490
• Publication Number:
  US 20170078121A1
• Time in Patent Office: 1,145 Days
• Field of Search: 370328, 340511
• CPC Class Codes: H04L 25/062 Setting decision thresholds using feedforward techniques only
• CPC Class Codes: H04L 27/14 Demodulator circuits; Receiver circuits
• CPC Class Codes: H04L 27/148 using filters, including PLL-type filters
• CPC Class Codes: H04L 7/0334 Processing of samples having at least three levels, e.g. soft decisions

Abstract

The present disclosure relates to a superposed signal sampling apparatus, including: a signal receiving module, a signal extracting module, and a signal output module. The signal receiving module is used to receive a superposed signal. The signal extracting module is used to determine whether the received superposed signal is within a preset threshold range of a direct current signal; if the received superposed signal is within the threshold range, extract a previously received signal as a direct current signal to be output; and if the received superposed signal is beyond the threshold range, extract a currently received signal as a direct current signal to be output. The signal output module is used to integrate the direct current signal extracted by the signal extracting module, and then output the direct current signal. The present disclosure further relates to a superposed signal sampling method.

Claims

1. A superposed signal sampling apparatus, configured to extract a direct current signal from a superposed signal, wherein the apparatus comprise a processor configured to:

receive a superposed signal;

determine whether the received superposed signal is within a preset threshold range of a direct current signal;

wherein if the received superposed signal is within the threshold range, the signal extracting module will extract a previously received signal as a direct current signal to be output; and

if the received superposed signal is beyond the threshold range, the signal extracting module will extract a currently received signal as a direct current signal to be output;

integrate the direct current signal extracted by the signal extracting module, and then output the direct current signal; and

perform filtering processing on the superposed signal received by the signal receiving module.

2. The superposed signal sampling apparatus according to claim 1, wherein the processor comprises a window filter.

3. The superposed signal sampling apparatus according to claim 1, wherein the superposed signal is a HART protocol signal.

4. The superposed signal sampling apparatus according to claim 3, wherein the processor is further configured to determine whether the received HART protocol signal is performing HART communication;

wherein if the HART protocol signal is not performing HART communication, the processor will extract the currently received signal as a direct current signal to be output; and

if the HART protocol signal is performing HART communication, the processor will continue to perform determining of the foregoing threshold range.

5. The superposed signal sampling apparatus according to claim 2, wherein the superposed signal is a HART protocol signal.

6. A superposed signal sampling method, used to extract a direct current signal from a superposed signal, wherein the method comprises:

(a) receiving a superposed signal;

(b) determining whether the received superposed signal is within a preset threshold range of a direct current signal;

if the received superposed signal is within the threshold range, performing step (c);

otherwise, performing step (d);

(c) extracting a previously received signal as a direct current signal to be output;

(d) extracting a currently received signal as a direct current signal to be output;

(e) integrating the direct current signal extracted in step (c) or (d), and then outputting the direct current signal, and returning to step (a),

wherein, prior to step (b) filtering processing on the received superposed signal is performed.

7. The superposed signal sampling method according to claim 6, wherein the filtering processing is a window filtering processing.

8. The superposed signal sampling method according to claim 6, wherein the superposed signal is a HART protocol signal.

9. The superposed signal sampling method according to claim 8, before step (b), further comprising the following step:

determining whether the received HART protocol signal is performing HART communication;

if the received HART protocol signal is performing HART communication, performing step (b);

otherwise, performing step (d).

10. The superposed signal sampling method according to claim 7, wherein the superposed signal is a HART protocol signal.