Metal cavity microwave band-pass filter for audio near field communication
A near-field payment, metal cavity technology, applied to waveguide-type devices, electrical components, circuits, etc., can solve the problems of high manufacturing cost, inconvenient processing, complex structure, etc., and achieve the effect of low cost, simple structure and small volume
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[0014] The present invention will be further explained below in conjunction with the drawings:
[0015] Such as figure 2 , image 3 with Figure 4 As shown, the audio near field payment system in the audio near field payment technology includes multiple ( figure 2 4) audio terminals that can communicate with each other through voice are shown in the figure. The audio terminals can be mobile terminals such as mobile phones, or fixed terminals such as payment platforms. Each audio terminal includes an audio transmitter and an audio receiver. The audio transmitter includes a convolutional code encoder, modulator, bandpass filter, D / A conversion circuit, power amplifier and speaker, and convolutional code encoding in series. The input end of the receiver inputs the application digital data signal, and the speaker outputs the sound signal as an information medium for near-field payment; the audio receiver includes a microphone, A / D conversion circuit, band pass filter, demodulator, ...
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