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Generating method, device and signal generating device of frequency control word

A frequency control word and control word technology, applied in the direction of automatic power control, electrical components, etc., can solve the problem of the error accumulation effect of the set frequency, and achieve the effect of saving storage space and improving the frequency setting speed.

Inactive Publication Date: 2011-09-28
BEIJING WUZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its defect is that the set frequency has error cumulative effect, as the frequency increases, the absolute error of the set frequency is also increasing

Method used

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  • Generating method, device and signal generating device of frequency control word
  • Generating method, device and signal generating device of frequency control word
  • Generating method, device and signal generating device of frequency control word

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] An embodiment of the present invention provides a method for generating a frequency control word, such as image 3 Shown:

[0044] Step 301 , according to the preset output frequency range and frequency resolution, the ratio B of the output frequency value within the output frequency range to the frequency resolution is obtained. Wherein, the output frequency range is A to F Hz, A≤F; the ratio is expressed as B=n 1 +n 2 ×10+n 3 ×10 2 +......+n i ×10 i-1 +... n p ×10 p-1 , when 1≤ii Take an integer from 0 to 9, when i=p, n i Take an integer from 1 to 9, T represents the frequency resolution, B represents the ratio;

[0045] Step 302, from the pre-acquired array related to the frequency control word, search for the n 1 to n p The value corresponding to the value that is not zero, the number of arrays related to the frequency control word is Among them, q is the logarithm of F and T with base 10 rounded up.

[0046] Step 303, process the found value to obta...

Embodiment 2

[0051] An embodiment of the present invention provides a method for generating a frequency control word, such as Figure 4 As shown, the method includes: step 401, obtaining an array related to the frequency control word.

[0052] In this embodiment, the array related to the frequency control word can be obtained in the following manner:

[0053] First, q output frequency arrays are obtained according to the output frequency range and frequency resolution. Among them, if the output frequency range is A to F Hz, A≤F, T represents the frequency resolution, then That is, the number of the array is rounded up to the logarithm of F / T with base 10. In this embodiment, the q output frequency arrays are:

[0054] M1'{T, 2T,...,9T}, M2'{10T, 20T,...,90T},..., Mi'{10 i-1 × T, 10 i-1 ×2T, ..., 10 i-1 ×9T},...,Mq′{10 q-1 × T, 10 q-1 ×2T, ..., 10 q-1 ×9T}.

[0055] Secondly, the frequency control words corresponding to the output frequency values ​​in the obtained q output frequ...

Embodiment 3

[0072] An embodiment of the present invention provides a method for generating a frequency control word. Such as Figure 5 As shown, the method includes: step 501, obtaining an array related to the frequency control word.

[0073] In this embodiment, the array related to the frequency control word can be obtained in the following manner:

[0074] First, q output frequency arrays are obtained according to the output frequency range and frequency resolution. As described in Embodiment 2, the output frequency array is:

[0075] M1'{T, 2T,...,9T}, M2'{10T, 20T,...,90T},..., Mi'{10 i-1 × T, 10 i-1 ×2T, ..., 10 i-1 ×9T},...,Mq′{10 q-1 × T, 10 q-1 ×2T, ..., 10 q-1 ×9T}.

[0076] Secondly, the frequency control word corresponding to the output frequency value in the obtained q output frequency arrays discards the fractional part and retains the integer part to obtain the processed array M, which is expressed as:

[0077] M1 (M11, M12, ..., M19), M2 (M21, M22, ..., M29), ...,...

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Abstract

The invention provides a generating method, a device and a signal generating device of frequency control word. The generating method of frequency control word comprises the steps as follows: according to preset output frequency range and frequency resolution, the ratio between an output frequency value within the output frequency range and the frequency resolution are obtained, and the ratio is expressed as B=n1+n2*10+...+ni*10<i-1>+...+np*10<p-1>; a numerical value corresponding to a non-zero value from ni to np in beforehand obtained arrays related to the frequency control word is searched; the searched value is processed to obtain the frequency control word corresponding to the output frequency value within the output frequency range. Therefore, the output frequency of a signal generator is continuously adjustable to obtain required signals of different amplitudes, memory space is saved, the output frequency is set at fast speed, and the output frequency has small absolute error and high precision.

Description

technical field [0001] The invention relates to the field of direct digital synthesis, in particular to a generation method, device and signal generating device of a frequency control word. Background technique [0002] The theoretical basis of Direct Digital Synthesis (DDS, DirecT DigiTAl Synthesis) technology is the Nyquist sampling theorem. According to this theorem, for a continuous sine wave signal of one period, the phase / amplitude sampling can be carried out at equal phase intervals along the direction of its phase axis to obtain the amplitude sequence of the discrete phase of the sine wave signal of one period ( as 2 N indivual). [0003] Such as figure 1 As shown, the analog amplitude is quantized, and the quantized amplitude is encoded with corresponding binary data. In this way, a continuous sine signal of one period can be converted into a discrete binary sequence, and finally stored in the read-only memory. The address of each storage unit is the phase sampl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/16
Inventor 郭键李明刘丙午朱杰
Owner BEIJING WUZI UNIVERSITY
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