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 described below in conjunction with accompanying drawing:
[0015] Such as figure 2 , image 3 and Figure 4 As shown, the audio near-field payment system in the audio near-field payment technology includes multiple ( figure 2 4 are shown in ) audio terminals capable of communicating with each other through sound. The audio terminals may 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, a modulator, a bandpass filter, a D / A conversion circuit, a power amplifier, and a loudspeaker that are sequentially connected in series. The convolutional code code The input terminal of the device inputs the digital data signal, and the speaker outputs the sound signal as an information medium for near-field payment; the audio receiver includes a series-connected microphone...
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