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Fractional delay method based on dynamic length frame processing

A fractional delay and frame processing technology, applied in the field of signal processing, can solve problems such as increased calculation and complex filter design process

Active Publication Date: 2019-07-26
SOUTHEAST UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

When the delay needs to be variable, the amount of calculation will increase a lot due to the complex design process of the filter

Method used

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  • Fractional delay method based on dynamic length frame processing
  • Fractional delay method based on dynamic length frame processing
  • Fractional delay method based on dynamic length frame processing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0166] The simulation signal parameters are set as follows: set the sampling frequency FS to 2000Hz, and the sampling function is:

[0167] cos(2*pi*fc1*t)+sin(2*pi*fc2*t)

[0168] Wherein, fc1=21.786Hz, fc2=45.337Hz, the total number of sampling points L=1999, and the preprocessed data sequence s(n) is obtained; the delay time is set to t_delay=8.3567.

[0169] According to step (2), initialize the single processing data segment length K=1000; line spectrum judgment window length τ=31; line spectrum detection amplitude threshold G=5; single frame length threshold A=100.

[0170] According to step (3), the sampling data sequence s(n) is segmented, and the sliding step is B=999 to obtain the segmented data sequence s j (l), j=0,1; l=0,1,...,999, j is the serial number of the segment, l is the serial number of the sampling point of each data sequence, and the number of data segments Q=2 at this time.

[0171] According to step (4), set the sequence number of the currently proc...

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Abstract

The invention discloses a fractional delay method based on dynamic length frame processing. The method comprises the following steps: step 1, acquiring a sampling data sequence of a signal to be delayed; 2, initializing parameters; step 3, performing segmentation processing on the sampling data; 4, calculating a single-segment data power spectrum, and further obtaining the optimal frame length ofthe single-segment data power spectrum; 5, generating a frequency domain linear weighting sequence; 6, performing framing processing, frequency domain linear weighting fractional delay and adjacent frame fusion processing on the single-segment data to obtain a fractional delay sequence; 7, repeating the step 4 to the step 6 until all the segmented data fractions are delayed; 8, performing head-to-tail connection combination on the segmented data sequences after the fractional delay; and 9, carrying out sequence shift integer delay on the merged data. According to the delay method, the power spectrum characteristic of the target delay data is utilized, the processing mode of dynamic frame length frame processing and interframe data fusion is adopted, the precision of data delay is improved,and the practical value is very high.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to a fractional delay method based on dynamic length frame processing. Background technique [0002] The precise time delay of digital signals is widely used in communication, synchronization technology, array signal processing, voice signal processing and other fields. Especially in array signal processing, the fields of digital beamforming, broadband signal source simulation, adaptive delay estimation, and time domain analysis of target echo all involve the precise delay of signals. [0003] There are two main methods of fractional digital delay design commonly used at present: (1) Direct implementation in time domain. There are mainly two forms of over-dense sampling and time-domain interpolation. Over-dense sampling is realized by increasing the sampling frequency of the analog signal during the signal receiving process. The increase in sampling frequency will great...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
CPCH04L1/0006H04L1/0007
Inventor 罗昕炜沈子涵方世良
Owner SOUTHEAST UNIV
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