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WO2019033191A1 - Procédé amélioré pour la communication de données entre dispositifs au moyen d'ondes sonores - Google Patents

Procédé amélioré pour la communication de données entre dispositifs au moyen d'ondes sonores Download PDF

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Publication number
WO2019033191A1
WO2019033191A1 PCT/BR2018/050288 BR2018050288W WO2019033191A1 WO 2019033191 A1 WO2019033191 A1 WO 2019033191A1 BR 2018050288 W BR2018050288 W BR 2018050288W WO 2019033191 A1 WO2019033191 A1 WO 2019033191A1
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WO
WIPO (PCT)
Prior art keywords
signal
pulses
data
pulse
sound
Prior art date
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Application number
PCT/BR2018/050288
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English (en)
Portuguese (pt)
Inventor
Marcelo DA CUNHA RAMOS
Vivian ROUSSEAU
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEARBYTES TECNOLOGIA DA INFORMACAO Ltda
Original Assignee
NEARBYTES TECNOLOGIA DA INFORMACAO Ltda
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Filing date
Publication date
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Publication of WO2019033191A1 publication Critical patent/WO2019033191A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves

Definitions

  • the present invention relates to a method especially developed for direct application in communication on mobile devices with computational potential (eg smartphone, tablet) through sound waves, allowing the communication of data between two devices without the need for additional hardware and / or any other type of connectivity.
  • mobile devices with computational potential eg smartphone, tablet
  • sound waves allowing the communication of data between two devices without the need for additional hardware and / or any other type of connectivity.
  • EP 1906696 A1 entitled “Information providing system” describes a model wherein a computer which broadcasts data through sounds emitted by the speaker thereof using NRZ (Non Return to Zero) modulation at frequencies preferably between 12 Khz and 13 Khz. A cellular device picks up the sound emitted and demodulates.
  • NRZ Non Return to Zero
  • this document describes in some detail the modulation / demodulation scheme, it ignores that airwaves are subjected to a large amount of noise interference from other sound sources in the environment and, above all, from the interference caused by the signal emitted and reflected by environmental surfaces. This makes it impossible to achieve the specified transmission speeds and makes the effectiveness of the disclosed method questionable.
  • WO 2005055566 A1 entitled “Sonic data communication between mobile phones” describes a generic method for communication between cellular phones through sound, using audio frequencies between 8 Khz and 22 Khz.
  • the description of the method used for modulation / demodulation is quite generic, covering practically all the methods listed in the technical literature and without going into technical details about which method has the most benefits.
  • reference is made to the sound communication in the document title it devotes only a few lines to identify the modulation / demodulation methods to be used, describing all the main methods of digital signal processing (DSP).
  • DSP digital signal processing
  • WO 2013166567 A8 entitled “Method for communicating data between devices via sound waves", of the same depositor, uses BPSK (Binary phase-shift keying) modulation. Although this method is more efficient than the others proposed, it still does not present specific solutions for some key problems highlighted in the scope of this patent. Generally, all such patent references generally describe methods for communicating between mobile devices in a more or less generic fashion. However, when observing the practical issues in this type of communication, it becomes evident a series that issues that are not resolved and solved by said documents.
  • BPSK Binary phase-shift keying
  • air is a medium of low density and with a velocity of sound propagation significantly lower than other means in which most of the traditionally used modulation / demodulation methods have been devised and developed, such as by example, the electromagnetic field.
  • the quality of the loudspeakers and microphones of the mobile devices and computers currently on the market is quite heterogeneous. While some devices can efficiently reproduce and pick up frequencies up to 22 Khz, others find it difficult to reproduce as well as pick up in different ranges of the spectrum used in audio playback, that is, up to 22 Khz / 24 Khz. This condition, on the one hand, makes the use of frequencies above the human auditory spectrum (above 20 Khz) unsatisfactory, since only a small set of devices will be able to communicate efficiently. In turn, the use of high frequencies within the audible spectrum may, depending on the modulation chosen, create unpleasant high sounds to the point of disturbing the hearing human.
  • Another object of the present invention is to provide an improved method for communicating data between devices via sound waves, which can be applied in the vast majority of the devices and varieties of speakers and microphones currently available on the market.
  • Figure 1 shows a general scheme of data transmission between two devices according to the method of the present invention
  • Figure 2 illustrates how near surfaces and the devices themselves generate reflections that interfere with the reception of the audio signal transmitted
  • Figures 3A and 3B show a sample FSK (transmitted shift keying) signal and a sample of the captured signal with multipath propagation (B) interference;
  • Figures 4A and 4B illustrate a sample PSK (transmitted phase shift keying) signal and a sample of the captured signal with multipath propagation (B) interference;
  • Figures 5A and 5B illustrate as a method using OOK (0/7 off keying) audio pulses (A) and a sample of the captured signal with multipath propagation (B) interference;
  • the original signal (A) is a sample of the captured signal with interference type multipath propagation (B);
  • Figure 7 illustrates the variable spacing used by the second coding method that identifies the bit groupings by the time distance between each pulse
  • Figure 8A and 8B illustrate the variable spacing used by the second coding method that identifies the bit groupings by the time distance between each pulse.
  • Figure 9 shows the conceptual block diagram of the method of demodulation of captured sound waves in data.
  • the general method of data transmission between two devices in accordance with the present invention comprises (i) encoding the digital data into digital sound signal, (ii) sending this digital signal to (iii) the propagation of sound in the air, (iv) the capture of sound through the microphone of the receiving device, (v) the transformation into digital sound data, and (vi) the decoding of the digital sound data for retrieval of the original data as issued.
  • the improved method for communicating data between devices via sound waves according to the present invention uses fast scattered frequency pulses. This specificity of the method according to the present invention is justified by the following non-exhaustive reasons:
  • Pulse amplitude is faster and easily detectable, making digital signal processors (DSPs) unnecessary more complex and computationally more expensive to the CPU of the devices; - because the pulses are very fast ( ⁇ 0.26 milliseconds), the pulse start can be detected before the interference of its reflections in the captured signal. Depending on the implementation this pulse size can be increased or reduced.
  • DSPs digital signal processors
  • pulse data encoding can be done in a number of ways, wherein the first form of modulation may be OOK (On Off keying), in which the presence of a pulse indicates a "1" bit ", while the absence of a pulse indicates a" 0 "bit.
  • Figure 5A shows an example graphic of original sound.
  • Figures 5A and 5B show graphs illustrating and emission of the original sound and its capture with interference.
  • a time window should be established where possible interference is ignored.
  • the maximum tolerable distance must be defined so that the signal can be skipped without sufficient signal attenuation so that it can be ignored.
  • a second most efficient form of modulation utilizes DPPM (2-bit Differential Pulse-Position Modulatior ⁇ ), combined with the window buffer (B) used in the first method described above.
  • the first pulse indicates the beginning of the information
  • the second pulse indicates the beginning of a new bit pair.
  • What defines the value of the bit pair is the distance between the pulses. The distance should follow the basics of the previous method, using window buffer B and pulse length P. As in the table below:
  • Figure 7 shows a graph with data encoded by this modulation method.
  • Signal demodulation is done in a similar way.
  • the first pulse identified marks the beginning of the signal.
  • the other pulses identify the data transmitted from the distance of time between the current pulse and the previous pulse.
  • This method is more efficient when B> P * (2N-1), where N is equal to the number of bits grouped by frame.
  • N 2N-1
  • N 2N-1
  • the coding process of the present invention is carried out by the following steps:
  • Figures 8A and 8B respectively illustrate the graphics with the sound originally emitted and that filtered and modulated according to step b) above the method according to the present invention.
  • the decoding process is described in the block diagram of Figure 9, and comprises the following steps:
  • PDET Peak Detector
  • the method according to the present invention comprising:
  • BPF Band Pass Filter
  • a decoding step consisting of: - capture the signal encoded by the microphone and scan through the audio capture hardware;
  • PDET Peak Detector
  • the method according to the present invention comprises:
  • BPF Band Pass Filter
  • PDET Peak Detector
  • One of the preferred applications of the present invention is its use in payment systems for mobile devices, thus enabling the large amount of mobile devices (smartphones, tablets and the like) present in the market can act as point of sale (POS) and payment devices using a simple mechanics of collection and payment.
  • POS point of sale
  • the paying device transmits, via sound, the payment code relating to its purchase. This code may contain information about the purchase ticket.
  • the vending device (POS) receives the code sent and makes the online conferencing of the authenticity of the same. Once authentication is complete, the sale can be completed.
  • One of the most direct features of the present invention is the pairing of devices, in order to enable two physically close devices to share data in a simple and intuitive way.
  • data transmission between two devices according to the present invention it is possible to easily pair two devices A and B, if device A and device B use the same application (or the functionality is already inserted in the operating system of the device itself ) and are physically close.
  • a and B can recognize and establish a link for information exchange. From this point on, both sender and receiver will already be identified for receiving and sending data.
  • an LF device may be connected to a door and lock release mechanism.
  • the said DF device connected to the lock will be constantly listening to the ambient sound and will have a database of disposable "keys" (data sequences).
  • a DL opening device will also have a database of "keys” for playback.
  • the DF lock device will acknowledge its validity and open the door.
  • the "key sound” used automatically becomes invalid after opening and will be discarded from both databases.
  • Personal information exchange An example of an additional application is the exchange of personal contact information, for example, business cards.
  • personal contact information for example, business cards.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé spécialement mis au point en vue d'une application directe dans la communication de dispositifs mobiles à capacité informatique (par exemple, smartphone, tablette) au moyen d'ondes sonores, permettant la communication de données entre deux dispositifs sans nécessité d'utiliser un matériel additionnel et/ou un quelconque autre type de connectivité. Dans sa conception la plus large, le procédé selon la présente invention comprend l'utilisation d'impulsions rapides à fréquence dispersée utilisant une bande plus large de fréquences pour une impulsion unique, un son intermittent (impulsions) et dans une large bande de fréquences (CSS - Chirp spread spectrum) et une amplitude d'impulsions plus rapidement et facilement détectable. Le procédé, entre autres nombreuses applications, est indiqué pour une utilisation dans un système de paiement par dispositif mobile, de partage d'informations, de fermetures électroniques.
PCT/BR2018/050288 2017-08-18 2018-08-15 Procédé amélioré pour la communication de données entre dispositifs au moyen d'ondes sonores Ceased WO2019033191A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BR102017017799-8A BR102017017799A2 (pt) 2017-08-18 2017-08-18 Método aperfeiçoado para comunicação de dados entre dispositivos através de ondas sonoras
BR102017017799-8 2017-08-18

Publications (1)

Publication Number Publication Date
WO2019033191A1 true WO2019033191A1 (fr) 2019-02-21

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BR (1) BR102017017799A2 (fr)
WO (1) WO2019033191A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005055566A1 (fr) * 2003-12-05 2005-06-16 Nokia Corporation Communication de donnees sonores entre des telephones mobiles
US7383297B1 (en) * 1998-10-02 2008-06-03 Beepcard Ltd. Method to use acoustic signals for computer communications
US7505823B1 (en) * 1999-07-30 2009-03-17 Intrasonics Limited Acoustic communication system
US9338002B2 (en) * 2008-10-31 2016-05-10 Samsung Electronics Co., Ltd Method and apparatus for wireless communication using an acoustic signal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7383297B1 (en) * 1998-10-02 2008-06-03 Beepcard Ltd. Method to use acoustic signals for computer communications
US7505823B1 (en) * 1999-07-30 2009-03-17 Intrasonics Limited Acoustic communication system
WO2005055566A1 (fr) * 2003-12-05 2005-06-16 Nokia Corporation Communication de donnees sonores entre des telephones mobiles
US9338002B2 (en) * 2008-10-31 2016-05-10 Samsung Electronics Co., Ltd Method and apparatus for wireless communication using an acoustic signal

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LEE, H. ET AL.: "Chirp Signal-Based Aerial Acoustic Communication for Smart Devices", PROC. OF INFOCOM 2015, 26 April 2015 (2015-04-26), Hong Kong, pages 2407 - 2415, XP033208519, Retrieved from the Internet <URL:https:/7ieeexplore.ieee.org/document/7218629> *

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