A Fractional Delay Method Based on Dynamic Length Frame Processing

A technology of fractional delay and frame processing, which is applied in the field of signal processing, can solve the problems of increased calculation amount and complex filter design process, etc., and achieve the effect of improving performance, good delay performance and improving delay accuracy

CN110061812BActive Publication Date: 2021-11-02SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-11-02

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Abstract

The invention discloses a fractional delay method based on dynamic length frame processing. The method comprises the following steps: the first step: acquiring the sampling data sequence of the signal to be delayed; the second step: parameter initialization; The data is segmented; the fourth step: calculate the power spectrum of a single segment of data, and then obtain its optimal frame length; the fifth step: generate a linear weighted sequence in the frequency domain; Domain linear weighted fractional delay and fusion processing between adjacent frames to obtain fractional delay sequence; Step 7: Repeat steps 4 to 6 until the fractional delay of all segmented data is completed; Step 8: After the fractional delay The segmented data sequence is merged by head-to-tail connection; the ninth step: perform sequence shift and integer delay on the merged data. The delay method of the invention utilizes the power spectrum characteristics of the target delay data, adopts dynamic frame long frame processing and inter-frame data fusion processing methods, improves the accuracy of data delay, and has high practical value.
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Description

Technical field

[0001] The present invention belongs to the field of signal processing, particularly to a method for dynamic fractional delay length of the frame processing. Background technique

[0002] Precise digital signals in a communication delay, synchronization, signal processing, speech signal processing, have a wide field of applications. Especially in array signal processing, digital beam forming, the field of wideband analog signal source, time-domain analysis and adaptive time delay estimation target echo and other problems are related to the precise time delay signal.

[0003] Fractional digital delay currently used design methods are mainly two: (1) Direct time-domain implementation. This had mainly two forms dense sampling and interpolation in the time domain. Oversampling the received signal in the process, it is achieved by increasing the sampling frequency of the analog signal. It will increase the computational complexity and hardware cost of a substantial inc...

Examples

Embodiment 1

[0166] The simulation signal parameters are set to: set the sampling frequency fs to 2000 Hz, the sampling function is:

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

[0168] Among them, Fc1 = 21.786Hz, FC2 = 45.337 Hz, total sample point number L = 1999, acquisition data sequence s (n); delay time is set to t_delay = 8.3567.

[0169] According to (2), the single processing data segment length k = 1000; the linear decision window length τ = 31; the linear detection amplitude threshold g = 5; single frame length threshold A = 100.

[0170] According to the step (3), the sampling data sequence S (N) is segmented, the sliding step is b = 999, resulting in segmentation data sequence S j (L), J = 0, 1; L = 0, 1, ..., 999, J is the segmentation segmentation number, L for each segment data sequence sampling point number, at which time the number of data segments q = 2.

[0171] According to (4), set the current processing data sequence number j = 0, and t_delay is divided into...