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Signal system for demodulation and filtering and demodulation and filtering method

A signal system and modulation signal technology, applied in the signal system and field of demodulation and filtering, can solve the problems that the input signal affects the output signal accuracy, the digital processing method is complicated, etc., and achieve the goals of saving power consumption, reducing accuracy requirements, and improving accuracy requirements Effect

Active Publication Date: 2013-07-03
NATIONZ TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above two demodulation methods for frequency shift keying modulated signals have high requirements for signal converters, and the subsequent digital processing methods are more complicated, and the accuracy of the input signal directly affects the accuracy of the output signal.

Method used

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  • Signal system for demodulation and filtering and demodulation and filtering method

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Embodiment 1

[0040] Please refer to image 3 , image 3 It is a schematic diagram of the demodulation and filtering signal system in this embodiment; the demodulation and filtering system includes a frequency discriminator 1, a signal conversion module 2 and a filtering module 3, wherein the frequency discriminator 1 receives a frequency shift keying modulation signal and Demodulate the received signal into an analog voltage amplitude signal and output it to the signal conversion module 2, the signal conversion module 2 converts the analog voltage amplitude signal into a digital signal, and then output it to the filter module 3, The filter module 3 performs filter processing on the digital signal in the digital domain. In this way, the signal is demodulated in the analog domain, avoiding the use of complex circuits to demodulate the signal in the digital domain, and the precision of the signal converter is not high. The signal is filtered in the digital domain, and the requirements for t...

Embodiment 2

[0052] Please refer to Figure 7 with Figure 8 ,in, Figure 7 It is a schematic diagram of the demodulation and filtering signal system in this embodiment; Figure 8 It is a schematic diagram of the structure of the symbol recovery circuit in this embodiment;

[0053] Such as Figure 7 Shown in the signal demodulation filter system described in the embodiment can also comprise symbol restoration circuit 4 and carry out symbol restoration processing to the signal processed by filtering module 3; The frequency will deviate from the center frequency of the transmitting end, which will bring a certain DC offset to the filtered signal, so a symbol recovery circuit is required to suppress the impact of the DC offset.

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Abstract

The invention discloses a demodulation and filtering system for a modulation signal. The modulation signal in an analog domain is demodulated into a voltage amplitude signal by a frequency detector; the voltage amplitude signal is input into a signal conversion module to be converted into a digital signal for filtering; a code element recovery circuit is added in the demodulation and filtering system for code element recovery processing of the modulation signal; the invention further discloses a demodulation, filtering and code element recovery method for the modulation signal based on the demodulation and filtering system; with the adoption of the demodulation and filtering system, a complicated digital demodulation circuit can be reduced; and the precision requirement on a signal converter is lowered.

Description

technical field [0001] The present invention relates to demodulation filtering and symbol recovery of frequency shift keying modulated signals. Background technique [0002] Frequency shift keying modulation is a digital modulation method often used in wireless communication systems, generally including FSK, GFSK and GMSK, etc., which can modulate the digital baseband signal to the carrier through frequency shift keying to realize radio frequency channel for communication. [0003] Please refer to figure 1 , figure 1 It is the schematic diagram of the existing receiver for frequency shift keying modulation signal; the antenna receives the weak high-frequency electromagnetic signal in the air and converts it into a high-frequency electrical signal, which is converted into an intermediate frequency signal after filtering and low-noise amplification, and the intermediate frequency signal is filtered After amplification processing, the demodulator is directly used to extract ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/14
Inventor 熊明
Owner NATIONZ TECH INC