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Time difference determination method and device

A technology of time difference and receiving time, which is applied in the field of signal processing, can solve the problems of inaccurate time difference and achieve the effect of accurate processing results

Active Publication Date: 2017-06-30
GUANGZHOU SHIKUN ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, an embodiment of the present invention provides a method and device for determining a time difference to solve the technical problem of using a cross-correlation function to determine the time difference between two signals is inaccurate

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  • Time difference determination method and device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] figure 1 It is a flowchart of a method for determining a time difference provided in Embodiment 1 of the present invention. The method for determining the time difference provided in this embodiment can be executed by the device for determining the time difference, and the device for determining the time difference can be implemented by means of software and / or hardware, and integrated in the receiving terminal. Wherein, the receiving terminal is a terminal capable of receiving and processing digital signals, such as an audio system with a microphone function.

[0025] refer to figure 1 A method for determining a time difference provided in this embodiment specifically includes:

[0026] S110. Acquire the received first digital signal and the second digital signal.

[0027] Wherein, the first digital signal and the second digital signal are signals with the same content sent by the same signal source at the same time, that is, the first digital signal and the second ...

Embodiment 2

[0048] Figure 2a It is a flowchart of a method for determining a time difference provided by Embodiment 2 of the present invention. This embodiment is embodied on the basis of the above-mentioned embodiments. refer to Figure 2a A method for determining a time difference provided in this embodiment specifically includes:

[0049] S210. Acquire the received first digital signal and the second digital signal.

[0050] S220. Starting from the Nth sampling moment, acquire a first frame of digital signal with length L from the first digital signal.

[0051] Wherein, N≥1. The length L of the first frame digital signal can be set according to actual conditions.

[0052] S230. Starting from the N-M sampling time, acquire a second frame digital signal of length L from the second digital signal at interval sampling time, and acquire J second frame digital signals in total.

[0053] Wherein, N≥M is to ensure that the digital signal of the second frame can be sampled at the Nth sam...

Embodiment 3

[0080] image 3 It is a schematic structural diagram of a device for determining a time difference provided in Embodiment 3 of the present invention. refer to image 3 , the structural diagram of the device for determining the time difference includes: a signal acquisition module 301 , a result calculation module 302 and a time difference determination module 303 .

[0081] Among them, the signal acquisition module 301 is used to acquire the first digital signal and the second digital signal received, the first digital signal and the second digital signal are the same, and the receiving time is different; Set rules to perform cross-correlation calculations on the first digital signal and the second digital signal to obtain calculation results; the time difference determination module 303 is used to analyze the symmetry of the calculation results to determine the first digital signal and the second digital signal. Signal time difference.

[0082] In the technical solution pr...

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Abstract

The present invention discloses a time difference determination method and device and belongs to the signal processing technical field. The method comprises the following steps that: a first path of digital signals and a second path of digital signals which have been received are acquired, wherein the first path of digital signals and the second path of digital signals are identical, and the receiving time of the first path of digital signals is different from the receiving time of the second path of digital signals; cross-correlation calculation is performed on the first path of digital signals and the second path of digital signals according to a preset rule, so that a calculation result can be obtained; and symmetry analysis is performed on the calculation result, so that the time difference of the first path of digital signals and the second path of digital signals can be determined. With the time difference determination method and device of the invention adopted, the determined time difference of the first path of digital signals and the second path of digital signals is more accurate under a limited sampling frequency.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of signal processing, and in particular, to a method and device for determining a time difference. Background technique [0002] If the same receiver includes multiple receiving devices, there will be time differences when different receiving devices receive signals from the same signal source, and the time differences will be different when the receiving directions are different. [0003] The cross-correlation function can determine the degree of correlation between two digital signals at any sampling moment. In practical applications, the cross-correlation function is usually used to determine the time difference between the two signals. The receiver performs cross-correlation calculation after sampling the two signals received by the receiving device. The larger the calculation result, the higher the correlation between the two sampling points. In the prior art, the two samplin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00
CPCH04R3/005
Inventor 刘荣
Owner GUANGZHOU SHIKUN ELECTRONICS TECH CO LTD