A kind of fsk demodulator, related equipment and method

Abstract

The invention discloses an FSK decoder, a device and a decoding method. The FSK decoder comprises: a sampling module, which is used for performing multiple sampling operations on an FSK modulated signal according to a preset number of sampling cycles by using a preset sampling frequency in the FSK start-up stage. Frequency sampling, to determine the average sampling value of the working frequency corresponding to the multiple frequency sampling; the level recovery module is used to use the preset sampling frequency in the FSK communication stage, according to the preset number of sampling cycles in real time. Frequency sampling, obtain the signal frequency dynamic statistical value of each frequency sampling respectively, and obtain the level signal according to the absolute value of the difference between the signal frequency dynamic statistical value and the average sampling value of the operating frequency; the level decoding module is used for statistical electrical The number of cycles that the signal frequency lasts after each level edge change in the flat signal to the next level edge change, and matches the preset cycle threshold range to determine the corresponding bit value. The FSK decoder, the processing results are accurate and easy to implement.

Description

technical field [0001] The invention relates to the field of wireless charging, in particular to an FSK demodulator, a wireless charging receiving end device and an FSK demodulation method. Background technique [0002] FSK (Frequency-shift keying, frequency-shift keying) is a modulation and demodulation method that uses different frequencies to represent different corresponding information symbols. In the prior art, for the wireless charging system of the QI standard proposed by the International Wireless Power Consortium (WPC), FSK modulation and demodulation are used to realize signal communication. Since the frequency of the transmitting end of the wireless charging system of the QI standard is switched between the operating frequency Fop and the modulation frequency Fmod, and the difference between the two frequencies is characterized by the two parameters of the polarity attribute and the depth attribute, therefore, in the FSK demodulation usually needs to judge the p...

AI Technical Summary

Problems solved by technology

Since the frequency of the transmitting end of the wireless charging system of the QI standard is switched between the operating frequency Fop and the modulation frequency Fmod, and the difference between the two frequencies is characterized by the two parameters of the polarity attribute and the depth attribute, therefore, in the During FSK demodulation, it is usually necessary to judge the polarity attribute of the modulated signal, and to support all the depth attributes of the modulated signal, which makes the existing FSK demodulation method complex and difficult to implement

Moreover, in the prior art, the analog demodulation method is usually used, the structure of the circuit is relatively complicated, and the anti-interference ability is poor.

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