Method and signal analysis instrument for analyzing a pulse modulated signal

Patent metadata

Field	Value
Publication number	US-2021281256-A1
Application number	US-202016813433-A
Country	US
Kind code	A1
Filing date	Mar 9, 2020
Priority date	Mar 9, 2020
Publication date	Sep 9, 2021
Grant date	—

Abstract

The present disclosure relates to a method of analyzing a pulse modulated signal, wherein the method comprises: receiving a pulse modulated signal; determining a dynamic threshold level based on a period of the pulse modulated signal and the pulse modulated signal; and demodulating the pulse modulated signal by the dynamic threshold level. Moreover, a signal analysis instrument for analyzing a pulse modulated signal is described.

First claim

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1 . A method of analyzing a pulse modulated signal, said method comprising:
receiving a pulse modulated signal; determining a dynamic threshold level based on a period of said pulse modulated signal and said pulse modulated signal; and demodulating said pulse modulated signal by said dynamic threshold level.

2 . The method according to claim 1 , wherein said dynamic threshold level varies in time.

3 . The method according to claim 1 , wherein a moving average is used when determining said dynamic threshold level.

4 . The method according to claim 1 , wherein said dynamic threshold level is determined by a filter.

5 . The method according to claim 4 , wherein said filter comprises at least one of a low pass, a high pass, a weighting, a mean calculation and a moving average.

6 . The method according to claim 1 , wherein a decimation interval is determined based on said period of said pulse modulated signal.

7 . The method according to claim 6 , wherein a maximum value and a minimum value are determined within said decimation interval.

8 . The method according to claim 7 , wherein said dynamic threshold level corresponds to half of the difference of said maximum value and said minimum value.

9 . The method according to claim 6 , wherein a mean value and a root mean square value are determined within said decimation interval.

10 . The method according to claim 9 , wherein said dynamic threshold level corresponds to a quotient of said mean value and said root mean square value.

11 . The method according to claim 6 , wherein said decimation interval is determined over more than one period of said pulse modulated signal.

12 . The method according to claim 1 , wherein said pulse modulated signal is acquired when said pulse modulated signal is received.

13 . The method according to claim 1 , wherein said pulse modulated signal is got from a memory when said pulse modulated signal is received.

14 . The method according to claim 1 , wherein said period of said pulse modulated signal is determined automatically.

15 . The method according to claim 1 , wherein said period of said pulse modulated signal is determined based on a manual input.

16 . The method according to claim 15 , wherein said manual input corresponds to at least one of a frequency of said pulse modulated signal and said period of said pulse modulated signal.

17 . The method according to claim 1 , wherein said dynamic threshold level is determined also based on a signal length of said pulse modulated signal.

18 . The method according to claim 1 , wherein said dynamic threshold level is determined also based on a sample rate of said pulse modulated signal.

19 . The method according to claim 1 , wherein said pulse modulated signal is at least one of a pulse width modulated (PWM) signal and a pulse density modulated (PDM) signal.

20 . A signal analysis instrument for analyzing a pulse modulated signal, the signal analysis instrument comprising an input, a signal processing circuit, a comparator, and a signal output,
wherein said input receives a pulse modulated signal, wherein said signal processing circuit determines a dynamic threshold level based on a period of said pulse modulated signal and said pulse modulated signal, wherein said comparator receives said dynamic threshold level and said pulse modulated signal, and wherein said comparator demodulates said pulse modulated signal while taking said dynamic threshold level and said pulse modulated signal into consideration.

Assignees

• Rohde & Schwarz

Inventors

• Barthel Sven
• Werner Andreas

Classifications

• H03K7/08 Primary

  Duration or width modulation {; Duty cycle modulation} · CPC title

• H03K7/06 Primary

  Frequency or rate modulation, i.e. PFM or PRM · CPC title

• H03D3/04

  by counting or integrating cycles of oscillations {(arrangements for measuring frequencies G01R23/10)} · CPC title