Sound-based near field communication system and method thereof

Abstract

The invention belongs to the technical field of communication and mainly relates to an electronic device and near field communication realizing data transmission between smart phones through sound. The invention provides a sound-based near field communication system and a method thereof. The main principle is that a prior loudspeaker and a prior sound pick-up of a smart phone or device are utilized fully and data communication of data information s realized through sound in a short distance. The main process includes steps of encrypting, signing or encrypting as well as signing data on a transmitting end; performing RS or BCH error correction of coding; transmitting sound through the loudspeaker after digital modulation; performing digital demodulation and then performing RS or BCH error detection of decoding after the sound is received by a receiving end ; decrypting, verifying signatures or decrypting as well as verifying the signatures; and data transmitted from the transmitting end is received. The main characteristic of the invention is that RS or BCH correcting codes are adopted for guaranteeing reliability of integral data transmission and a cryptographic technique is utilized for guaranteeing data safety.

Description

technical field [0001] The invention belongs to the field of IT near-field data communication, and relates to a software system and method for using sound as short-distance, reliable and safe data communication. The invention provides a feasible near-field (NFC) voice communication with small amount of data between smart phones. Background technique [0002] With the popularity of smart phones, mobile Internet applications have sprung up like mushrooms, especially mobile applications based on the two major platforms of Apple and Android. At present, in addition to relying on communication methods other than telecom operators, the communication between smart phone terminals also includes Wifi, Bluetooth, ZigBee, RFID, NFC and other methods. The transmission of large amount of data (such as account number, order number) has disadvantages such as high cost and cumbersome operation without exception. Although the current NFC-based near-field communication technology is simple ...

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Problems solved by technology

[0004] In addition, there are documents and patents mentioning the use of DTMF coding technology for acoustic wave or ultrasonic communication between electronic equipment and mobile phones; it is found through experiments that DTMF has strong error detection and error correction and anti-interference capabilities in radio channels, but in The usual human acoustic environment does not have very good error detection, error correction and anti-interference capabilities; more importantly, the data transmitted at one time is very small, usually below tens of bytes, and it is difficult for such data transmission length to be transmitted at a high speed. Strong digital encryption or signature, because usually digital encryption or signature requires a single transmission of data to be at least longer than the length of an encrypted block, and commonly used encryption algorithms, especially public key algorithms, encrypt blocks that are larger than tens of bytes, such as 1024 bits The RSA encrypted group is 128 bytes in length, so the voice communication encoded by DTMF does not have good application feasibility and application security

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