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Method for preventing static noise error code and digital filtering in remote control toy chip

A technology of digital filtering and remote control toys, applied in the field of digital filtering, can solve the problems of short distance without shaking remote control, effective signals cannot be decoded, and no filtering of received signals, etc., and achieve the effect of improving the distance without shaking of remote control.

Inactive Publication Date: 2008-09-03
ARTEK MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Use this method to prevent misdecoding of radio frequency (RF) static noise, the signal waveform is too demanding, and the effective signal cannot be decoded if there is a slight glitch, resulting in a very short remote control without shaking, and at the same time, the received signal is not filtered

Method used

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Examples

Experimental program
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Embodiment Construction

[0009] Assuming that the theoretical frequency of a signal received by a remote control toy chip using an RC oscillator is 500HZ, and its frequency margin is ±20%, then when the remote control toy chip detects that the frequency of the input signal it receives is in the range of 400 to 600HZ If the frequency of the input signal received by the remote control toy chip is not within the range of 400-600HZ, the remote control toy chip will These input signals are determined to be RF static noise, and the RC toy chip is disabled from decoding these signals.

[0010] Assuming that the minimum pulse width of the input signal (including positive pulse and negative pulse) is 0.5ms, and is filtered by a 4-stage serial shifter (shift), the minimum input clock clock of 8khz is used to drive the serial shifter (shift) . For safety, use 16khz input clock clock to drive the serial shifter (shift), decode the 4 outputs of the 4-level serial shifter (shift) and send them to clear "0" and set...

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Abstract

The present invention detects the frequency of the input signal to judge whether the input signal is effective signal or RF static noise to avoid error decoding on the RF static noise, and performs digital filtering on the received signal to filter out noise from the input signal.

Description

Technical field [0001] The invention relates to a method for preventing static noise from misdecoding and digitally filtering received signals in a remote-controlled toy chip. Background technique [0002] At present, many remote control toys use a super regenerative radio frequency (RF) structure. This structure has strong static noise when it is static. Among them, if only relying on the duty cycle (Duty) to decode, it is very likely to misdecode the static noise of the radio frequency (RF) when it is static. In order to avoid the occurrence of the above situation, the current remote control toy chip uses an n-level serial shifter (shift) (the input clock clock is m times the frequency corresponding to the minimum pulse width of the signal, m>n) to sample the received signal, if "10...01" (one or several "0s" in the middle) or "01...10" (one or several "1s" in the middle) appear in the n sampling data, indicating that there is a small pulse glitch in the signal , deco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02H04B1/10
Inventor 王峰
Owner ARTEK MICROELECTRONICS