A controller for communicating with an intelligent terminal based on an audio line and its communication method

Abstract

The invention discloses a controller communicated with an intelligent terminal based on an audio cable. The controller comprises an MCU and a communication processing unit on the periphery of the MCU. One side of the communication processing unit is connected with the MCU, and the other side of the communication processing unit is connected with an audio cable connector. The communication processing unit comprises a signal conditioning circuit, a clock comparison circuit, a bitstream comparison circuit and a D trigger. The controller has extremely large universality, an audio interface is a standard interface universal for all intelligent terminals, difference does not exist between the audio interface and the standard interface basically, an external device can be connected with the intelligent terminal in a simpler mode with less cost by expanding the controller on the external device, and the software load borne by the external device is extremely small. The invention further discloses a communication method between the controller and the intelligent terminal. The intelligent terminal can be stably and reliably communicated with the external device, and the applications of the external device can be expanded by depending on the strong data processing, data storing and network interacting capabilities of the intelligent terminal.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a controller for communicating with an intelligent terminal based on an audio line and a communication method thereof. Background technique [0002] With the rapid development of computer technology, smart mobile terminal devices have been widely used. With the development of cloud computing, cloud storage and other technologies, smart mobile terminals have become more and more widely used, and play an increasingly important role in people's daily life. Important status, such as smart mobile terminals such as smartphones and tablets, bring great convenience to people's lives. [0003] The performance improvement of smart mobile terminals is very obvious, so that more and more applications are developed based on smart mobile terminals, and the form of Internet of Things with smart mobile terminals as the core bridging external devices is becoming more and more ma...

AI Technical Summary

Problems solved by technology

The Chinese patent with the publication number CN203149650U discloses a secure payment authentication device using an audio interface for communication, in which the MCU uses an audio codec module for the communication part of the audio interface, that is, a dedicated audio codec chip, which is costly and complicated to communicate

The Chinese patent with the publication number CN102646175A discloses a security authentication device and authentication method using audio signal communication, which uses a frequency shift keying communication method, that is, two different frequencies are used to carry binary "1" and "0" respectively , but this method is cumbersome for the MCU to demodulate, and needs to identify two different frequencies. At the same time, if the frequency changes during the transmission process, it will easily bring errors to the decoding.

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