Non-linear digital filtering method for handling binary noise

A technology of noise filtering and digital filtering, applied in the direction of digital technology network, electrical components, impedance network, etc., can solve problems such as aging and environmental factors

Inactive Publication Date: 2007-02-28
HIGHER WAY ELECTRONICS
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Problems solved by technology

[0006] Another object of the present invention is to provide a kind of non-linear digital filter method that is used to process binary noise, it uses firmware (Firmware) to make non-linear digital filter, except can obtain better anti-noise effect, also It can save extra hardware cost and overcome the defect that noise filters that generally use analog circuits are susceptible to component aging and environmental factors

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  • Non-linear digital filtering method for handling binary noise
  • Non-linear digital filtering method for handling binary noise
  • Non-linear digital filtering method for handling binary noise

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Embodiment Construction

[0014] Referring first to Fig. 2, it is a schematic diagram for filtering out low-level noise in the present invention, and it is mainly provided with a low-level noise filtering device 30, which includes a digital filter H 1 (Z) 10 and a limiter 13, wherein the digital filter H 1 The input / output relationship of (Z)10 is as follows:

[0015] the y 1 (n) = 1 / 4x 1 (n)+1 / 2y 1 (n-1)+1 / 4y 1 (n-2);

[0016] where x 1 (n)11 is the input signal obtained by sampling, y 1 (n)12 is the output signal; in addition, in H 1 (Z) 10 is followed by a limiter 13 whose levels are 0 and A, and the threshold value (Threshold) of the limiter 13 is set to αA, where 0.5<α<1.

[0017] An example is as follows: If the input signal x is disturbed by noise 1 When (n)11 is {0, 0, 0, 0, A, A, 0, 0, 0, 0}, it is assumed that the starting time is n=0, that is, x 1 (0)=0,x 1 (1)=0, and so on; where x 1 (4)=x 1 (5)=A is hypothetical low-level noise, under the condition of initial condition y(-1)=y...

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Abstract

The invention refers to a nonlinear digital filter method to process dual noise, especially adopting firmware to design a 'nonlinear digital filter', producing filter effect on the noise of low-frequency radio-controlled timepieces, and having efficacies of overcoming the persecution of pulse-type dual noise, saving extra hardware cost, and preventing the parts from aging and being influenced by environmental factor.

Description

technical field [0001] The invention relates to a noise processing method of a low-frequency electric wave timing device, in particular to using a non-linear digital filter to process pulse-type binary noise that cannot be resisted by a general filter. Background technique [0002] Generally, low-frequency radio stations used to broadcast time are transmitted using a digital system, and the broadcast time information uses square waves with different duty cycles to represent binary "0" and "1". [0003] In addition, the system uses another square wave with a different duty cycle to represent the data frame identifier (Identifier Marker, M), which is used to define the position of the transmitted data. Taking the Japanese system as an example, see Figure 1 for the signal element diagram, in which the duty cycle of the signal elements (Signal elements) representing "0", "1" and "M" are 80% "0", 50% " 1" and 20% "M". [0004] But in fact, the demodulated signal at the receivin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/00
Inventor 何进安张清濠
Owner HIGHER WAY ELECTRONICS
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