Receiving end signal processing method based on zero-cross detection

Abstract

The invention relates to a receiving end signal processing method based on zero-cross detection. The receiving end signal processing method comprises the following steps of: (1), obtaining a signal demodulated through a receiving end AM demodulation circuit by a receiving end; (2), performing zero-cross detection of the signal demodulated through the receiving end AM demodulation circuit, and performing zero crossing point marking of zero crossing points; (3), according to at least two adjacent zero crossing points, judging whether a current zero crossing point is a bit judgement point or not; (4), according to the bit judgement point, performing bit 0 and bit 1 judgement; and (5), according to a bit 0 and bit 1 judgement result, decoding and outputting complete frames. By adoption of the receiving end signal processing method based on zero-cross detection having such a structure, the problem that bit 0 and bit 1 judgement is inaccurate due to a burr noise signal can be solved; the problem that bit 0 and bit 1 judgement is fuzzy and difficultly carried out due to a demodulation filter can be solved; therefore, the decoding accuracy rate is increased; and high-efficiency communication of a wireless charging system is ensured.

Description

technical field [0001] The present invention relates to the field of electronic technology, in particular to modulation and demodulation, in particular to a signal processing method at a receiving end based on zero-crossing detection. Background technique [0002] The wireless charging transmitter circuit undergoes AM demodulation to obtain a waveform similar to two-way differential encoding, such as figure 1 , the code rate of bidirectional differential encoding is fixed at 2KHz, the rule of differential encoding is that bit "1" code jumps twice in one internal clock cycle, bit "0" code jumps once in one internal clock cycle, internal clock t CLK =500us, namely f CLK = 2KHz, such as figure 2 . The traditional zero-crossing detection decoding circuit is that when the waveform is converted from the positive half cycle to the negative half cycle, the system makes a detection to get a zero point when the waveform passes through the zero point, and then counts the number of ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide a method to solve the problem of generating bit "0" and bit " 1” and the uncertain problem and judgment error problem based on the zero-crossing detection signal processing method at the receiving end

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