Method and apparatus for detecting envelope using difference between sampling signals

• US 9,191,254 B2
• Filed: 01/29/2013
• Issued: 11/17/2015
• Est. Priority Date: 03/29/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Yoon, Seung Keun, Kwon, Ui Kun, Kim, Sang Joon
• Primary Examiner(s): Bolourchi, Nader
• Application Number:
  US13/752,439
• Publication Number:
  US 20130259167A1
• Time in Patent Office: 1,022 Days
• Field of Search: 375/340
• US Class Current: 1/1
• CPC Class Codes: G01B 9/02083 characterised by particular signal processing and presentation
• CPC Class Codes: G01B 9/0209 Low-coherence interferometers
• CPC Class Codes: G10H 1/057 by envelope-forming circuits
• CPC Class Codes: G10H 2250/025 Envelope processing of music signals in, e.g. time domain, transform domain or cepstrum domain
• CPC Class Codes: G10H 2250/031 Spectrum envelope processing
• CPC Class Codes: G10L 25/03 characterised by the type of extracted parameters
• CPC Class Codes: H04L 27/06 Demodulator circuits; Receiver circuits

Abstract

A method and an apparatus for detecting an envelope using a difference between sampling signals are provided. The method includes generating sampling sets based on sampling signals of a modulated signal, and determining a sampling set from the sampling sets. The method further includes determining an envelope component value associated with a sampling signal among sampling signals included in the determined sampling set, based on a difference between the sampling signals included in the determined sampling set, and a difference between sampling signals included in each of the sampling sets other than the determined sampling set. The method further includes detecting an envelope of the modulated signal based on the envelope component value.

Claims

1. A method of detecting an envelope, the method comprising:

generating a first sampling set, a second sampling set, and a third sampling set based on samples of a modulated signal, each sampling set includes two sampling signals;

determining the first sampling set to be a target sampling set;

determining an envelope component value associated with a sample among samples included in the target sampling set, based on a difference between the samples included in the target sampling set, a difference between samples included in the second sampling set, and a difference between samples included in the third sampling set; and

detecting an envelope of the modulated signal based on the envelope component value,

wherein distances between sampling signals included in sampling sets are equal and distances between centers of the sampling sets are equal.

2. The method of claim 1, further comprising:

determining the samples to comprise at least four consecutive samples from a plurality of samples of the modulated.

3. The method of claim 2, wherein each of the first, second, and third sampling sets comprises a respective pair of the at least four consecutive samples.

4. The method of claim 1, wherein the samples are sampled at equal time intervals.

5. The method of claim 1, further comprising:

performing multiplication on the difference between the samples included in the target sampling set;

performing multiplication on the difference between the samples included in the second sampling set and the difference between the samples included in the third sampling set; and

performing subtraction on values determined by the multiplications to determine the envelope component value.

6. The method of claim 1, further comprising:

determining envelope component values associated with the sample; and

determining an average value of the envelope component values.

7. The method of claim 1, further comprising:

determining the samples to comprise a first sample, a second sample, a third sample, and a fourth sample, from a plurality of samples of the modulated signal,

wherein a first time interval between the first sample and the second sample, a second time interval between the second sample and the third sample, and a third time interval between the third sample and the fourth sample, are equal to each other.

8. The method of claim 1, further comprising:

determining the samples to comprise a first sample, a second sample, a third sample, and a fourth sample, from a plurality of samples of the modulated signal; and

adjusting a first time interval between the first sample and the second sample, a second time interval between the second sample and the third sample, and a third time interval between the third sample and the fourth sample.

9. The method of claim 1, wherein a time interval between the samples included in the target sampling set is equal to a time interval between the samples included in the second sampling set and a time interval between the samples included in the third sampling set.

10. A non-transitory computer readable storage medium storing a program comprising instructions to cause a computer to implement the method of claim 1.

11. An apparatus configured to detect an envelope, the apparatus comprising:

a determining unit configured to generate a first sampling set, a second sampling set, and a third sampling set based on samples of a modulated signal, each sampling set including two sampling signals, and to determine the first sampling set to be a target sampling set;

a calculating unit configured to determine an envelope component value associated with a sample among samples included in the target sampling set, based on a difference between the samples included in the target sampling set, a difference between samples included in the second sampling set, and a difference between samples included in the third sampling set; and

a detecting unit configured to detect an envelope of the modulated signal based on the envelope component value,

wherein distances between sampling signals included in sampling sets are equal and distances between centers of the sampling sets are equal.

12. The apparatus of claim 11, further comprising:

an extracting unit configured to determine the samples to comprise at least four consecutive samples from a plurality of samples of the modulated signal.

13. The apparatus of claim 12, wherein each of the first, second, and third sampling sets comprises a respective pair of the at least four consecutive samples.

14. The apparatus of claim 11, wherein the samples are sampled at equal time intervals.

15. The apparatus of claim 11, wherein the calculating unit comprises:

a multiplier configured to

perform multiplication on the difference between the samples included in the target sampling set, and

perform multiplication on the difference between the samples included in the second sampling set and the difference between the samples included in the third sampling set; and

an adder configured to perform subtraction on values determined by the multiplications to determine the envelope component value.

16. The apparatus of claim 11, wherein:

the calculating unit is further configured to determine envelope component values associated with the sample; and

the apparatus further comprises an average operator configured to determine an average value of the envelope component values.

17. The apparatus of claim 11, further comprising:

an extracting unit configured to determine the samples to comprise a first sample, a second sample, a third sample, and a fourth sample, from a plurality of samples of the modulated signal,

wherein a first time interval between the first sample and the second sample, a second time interval between the second sample and the third sample, and a third time interval between the third sample and the fourth sample, are equal to each other.

18. The apparatus of claim 11, further comprising:

an extracting unit configured to determine the samples to comprise a first sample, a second sample, a third sample, and a fourth sample, from a plurality of samples of the modulated signal; and

an adjusting unit configured to adjust a first time interval between the first sample and the second sample, a second time interval between the second sample and the third sample, and a third time interval between the third sample and the fourth sample.

19. The apparatus of claim 11, wherein a time interval between the samples included in the target sampling set is equal to a time interval between the samples included in the second sampling set and a time interval between the samples included in the third sampling set.

20. The apparatus of claim 11, wherein the calculating unit is further configured to determine the envelope component value further based on a scaling factor.