FSK demodulator, related equipment and method

Abstract

The invention discloses an FSK decoder, equipment and a decoding method, and the FSK decoder comprises a sampling module which is used for employing a preset sampling frequency at an FSK starting stage, carrying out the frequency sampling of an FSK modulation signal for many times according to a preset sampling period number, and determining a working frequency average sampling value correspondingto the frequency sampling for many times; a level recovery module which is used in an FSK communication stage and used for performing frequency sampling on the FSK modulation signal in real time according to a preset sampling period number by adopting the preset sampling frequency to obtain a signal frequency dynamic statistical value of each time of frequency sampling, and obtaining a level signal according to an absolute value of a difference value between the signal frequency dynamic statistical value and the working frequency average sampling value; and a level decoding module which is used for counting the number of cycles from each time of level edge change to the next time of level edge change in the level signal, matching the number of cycles with a preset cycle threshold range, and determining a corresponding bit value. The FSK decoder is accurate in processing result 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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