KR20170047634A

KR20170047634A - System and method for transceiving data using non-audible frequency band

Info

Publication number: KR20170047634A
Application number: KR1020150147988A
Authority: KR
Inventors: 도용남; 김승현; 황희원; 권태성; 이광오
Original assignee: 도용남; 이광오; 권태성; 김승현; 황희원
Priority date: 2015-10-23
Filing date: 2015-10-23
Publication date: 2017-05-08
Also published as: KR101755648B1

Abstract

The present invention relates to a system and a method for transmitting and receiving data by using a non-audible frequency band. The system for transmitting and receiving data by using a non-audible frequency band comprises: a transmitter (1) and a receiver (2) to perform a data communication for all characters without distinguishing English and Korean by using a preset non-audible frequency band. The transmitter (1) comprises: a frequency matching part (11); a frequency generator part (12); and a PCM output part (13).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system and method for transmitting and receiving data using a non-audible frequency band,

More particularly, the present invention relates to a system and method for transmitting and receiving data using an invisible frequency band, and more particularly, to a system and method for transmitting and receiving data using a non-audible frequency band, in which a user generates a character string to be transmitted according to a high frequency band pattern, And more particularly, to a system and method for transmitting / receiving data using an inaccessible frequency band in order to utilize a new type of near-field data communication by utilizing a communication method of receiving a micro-receiver.

Technologies related to Indoor Positioning (Bluetooth LE, RFID, UWB, PDR, etc.), which can grasp the indoor position recently, are becoming popular.

In the indoor space, it is difficult to estimate the position because GPS signals can not be received from satellites. However, technical demand is increasing to provide various LBS (Location-Based-Service) in the room. Especially, with the rapid spread of smart phones, there are a growing number of attempts to provide location-based services for indoor space.

However, in the case of the conventional technology, there is a drawback in that it is costly and the accuracy is low. In order to solve these problems, many studies have been made and it is required to develop a technique for providing a single method that can easily approach the weak points in the technical field.

On the other hand, FIG. 1 shows the audible frequency and the audible frequency. Referring to FIG. 1, the mobile phone has a recognizable range frequency of 18,500 Hz to 24,000 Hz, although it is not heard by humans. This is a sound that can not be heard by human beings, and by using sound as a means of communication, the sensitivity of the signal can be adjusted according to the intensity of the sound, so that the user can be informed of the position without using any wireless communication means, And can be used for local data communication.

Accordingly, the present invention provides a new method of short distance data communication for transmitting and receiving a string without inconvenience to the user by utilizing the non-audible frequency band instead of the audible frequency band.

[Related Technical Literature]

1. Apparatus and method for transmitting / receiving data through non-audible frequency, apparatus and method for providing audio data using audible frequency (Patent Application No. 10-2012-0056290)

2. Acoustic transceiver and its transmitting / receiving method (Patent Application No. 10-2009-0098939)

3. System and method for transmitting and receiving data in an audible frequency band (Patent Application No. 10-2008-0080188)

4. System and method for transmitting and receiving data in an audible frequency band sound wave communication and apparatus applied thereto (Patent Application No. 10-2010-0107256)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide a method and apparatus for generating a character string to be transmitted by a user in accordance with a high frequency band pattern, And a data transmission / reception system using the non-audible frequency band and a method for providing a new type of near-field data communication.

In addition, the present invention can be applied to a wireless communication system in which a user can transmit a character string or a non-audible signal to enable bi-directional communication between a user and a wireless module (4g, wifi, Blootooth, etc.) A system and method for transmitting and receiving data using a frequency band.

However, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a data transmission / reception system using a non-audible frequency band according to an embodiment of the present invention, In a data transmission / reception system using an inaudible frequency band including a transmitter 1 and a receiver 2, a transmitter 1 has a transmitter 1 and a receiver 2. When a string is inputted into an input unit (not shown) A frequency matching part 11 for extracting a frequency of the non-audible frequency band using a frequency matching table matched with each character constituting the encoded string by the encoder 1a; A frequency generator unit 12 for generating a matching frequency extracted by the frequency matching unit 11; And the PCM data (Pulse Code Modulation data) corresponding to the time order of the frequencies generated by the frequency generator 12 are output as a file or a sound signal type so that the file is stored in the memory 1b, A PCM output part 13 to be inputted to a microphone (MIC) 2a of a receiver 2 according to an output to the outside through a speaker 1c; And a control unit.

At this time, it is preferable that the predetermined non-audible frequency band is 18,500 Hz to 24,000 Hz.

In addition, the present invention is characterized in that, after receiving a sound signal and an external sound signal, which are formed in a receiver (2) and contain data input to a microphone (MIC) A frequency domain filter part 14 for classifying the received signal; A frequency sampling unit 15 for sampling the divided non-audible frequency band in units of a preset frequency; And extracting measurement data according to a pitch search for finding a frequency at which a decibel corresponding to a numerical value larger than a set reference value among sampled frequencies among the frequencies received for a predetermined time is found, (Pitch Detection part) 16 for outputting characters through a translate algorithm; So that substantial data is output by decoding.

In addition, the pick-to-translate algorithm outputs a value of the most measured character among measurement data values while performing a measurement for a predetermined number of times for a preset time, And outputting measurement data corresponding to a larger average value of the peak points as a character.

In order to accomplish the above object, a method of transmitting / receiving data using an audiovisual frequency band according to an embodiment of the present invention is characterized in that when a string is inputted into an input unit (not shown) by a frequency matching unit 11, A first step of extracting a frequency of the non-audible frequency band using a frequency matching table matched with each character constituting the encoded character string by the first matching step; A second step of generating a matching frequency extracted by the frequency matching unit 11 by the frequency generator unit 12; And the PCM output part 13 output PCM data (Pulse Code Modulation data) corresponding to the time order of the frequency generated by the frequency generating part 12 as a file or a sound signal type, The sound signal is stored in the memory 1b, and the sound signal is output to the outside through a speaker 1c; And a control unit.

The system and method for transmitting / receiving data using the non-audible frequency band according to an embodiment of the present invention generates and transmits a character string to be transmitted by a user in accordance with a high frequency band pattern that the user does not feel, There is an effect that it is possible to provide a new type of near field data communication by utilizing the communication method of receiving.

In addition, the system and method for transmitting / receiving data using the non-audible frequency band according to another embodiment of the present invention may include a separate wireless module (4g, wifi, Blootooth, etc.) for transmitting a character string, Way communication between users without operating any other GPS directly.

1 is a diagram showing an audible frequency and an audible frequency;
2 shows an overall system including a transmitter 1 and a receiver 2 for providing a method for transmitting and receiving data using an audible frequency band according to an embodiment of the present invention.
3 is a diagram showing a frequency matching table;
4 shows a frequency-time graph.
5 is a diagram for explaining a communication protocol of the transmitter 1. Fig.
6 is a diagram for explaining a frequency data generation process;
7 and 8 are diagrams for explaining a process of transmitting and receiving a string to and from a frequency between a transmitter 1 and a receiver 2. Fig.
FIG. 9 is a reference diagram showing a test example of a frequency transmitter user interface (hereinafter referred to as "Porong Transmitter") implemented in an output unit (not shown) of the transmitter 1. FIG.
10 is a graph illustrating frequency transmitter spectrum analysis;
11 is a diagram for explaining output data output to a character string as a test module corresponding to a receiver 2,

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In the present specification, when any one element 'transmits' data or signals to another element, the element can transmit the data or signal directly to the other element, and through at least one other element Data or signal can be transmitted to another component.

2 is a diagram showing an entire system including a transmitter 1 and a receiver 2 for providing a method of transmitting and receiving data using an audible frequency band according to an embodiment of the present invention. Referring to FIG. 2, a transmitter 1 and a receiver 2 are devices that provide transmission and reception of signals and data to a user via a wireless link, which are portable devices of a comprehensive concept. (Global System for Mobile) phone, a W-CDMA (Wideband CDMA) phone, a CDMA-2000 phone, an MBS (Mobile Broad and System) phone, a PMP Player, a handheld computer, a smart phone and a smart pad, and the like.

First, a high-frequency band 18,500 Hz to 24,000 Hz among the non-audible frequency bands is used to construct a library capable of data communication for all characters without distinguishing between English and Korean. The library itself is referred to as a high frequency band transmission / reception module 10 (Porong library). The library includes a frequency matching part 11 formed in a transmitter 1, a frequency generator a PCM output unit 13 and a frequency domain filter unit 14 formed in a receiver 2 and a frequency sampling unit 14, part 15, and a pitch detection part 16.

First, a frequency matching part 11 receives a frequency matching table (see FIG. 3) determined for an encoded string by the encoder 1a of the transmitter 1 To extract the matching frequency. That is, the frequency matching unit 11 extracts the frequency of the non-audible band matching the character constituting the character string with respect to the character string input to the input unit (not shown) of the transmitter 1 .

The frequency matching table of FIG. 3 is a table defined for frequency and ASCII characters. In the table of FIG. 3, it can be seen that the NULL value which is the value of ASCII 0 and the characters of ASCII 32 to 127 are matched from the frequency of 19,000 Hz to 19,990 Hz and the frequency of 20,000 Hz to 20,990 Hz, 21,000 Hz to 21,990 Hz, Hz to 22,990 Hz are all matched in the same pattern. Here, 19000 Hz to 19990 Hz is the first character band, 20,000 Hz to 20,990 Hz is the second character band, 21,000 Hz to 21,990 Hz is the third character band, and 22,000 Hz to 22,990 Hz is the fourth character band.

In the table of FIG. 3, frequencies corresponding to "** 000", "** 010", "** 980", and "** 990" are designated as null values, I did not. By doing so, matching is made so that when input is received for all characters that can be represented, the conversion is possible.

Next, the frequency generator unit 12 generates the matching frequency extracted by the frequency matching unit 11. [ Here, it is generated in the same order as the frequency-time graph shown in FIG.

More specifically, with reference to FIG. 5, a communication protocol of the transmitter 1 will be described. Since the transmitter 1 is different from the conventional communication method in terms of voice frequency communication, a new communication protocol is needed. The first start bit produces a sound of 18,600 Hz and sets it to 0.01 seconds to indicate that communication will begin. Four character bands (first to fourth character bands) are generated at a time and reproduced for 0.1 second. The character bits are reproduced at a frequency corresponding to each character of the frequency matching table for each frequency band Value. Next, a frequency of 18,750 Hz corresponding to a delimiter bit for generating a segment is generated, and then four strings are reproduced simultaneously. That is, the characters are set to four frequencies at the same time, and a frequency of 18,750 Hz corresponding to a delimiter bit is set for 0.01 second. At the end, 18,900 Hz corresponding to the end bit (End bit) indicating that the string input ends is set for 0.01 second.

For example, "Hello World !! (0.01 sec) -Hell (0.1 sec) -Delivery bit (0.01 sec) -o Wo (0.1 sec) -Delivery bit (0.01 sec) -rld! (0.1 sec) - Hello World !! Like the delimiter bit (0.01 second) -! (0.1 second) - Delimiter bit (0.01 second) - End bit (0.01 second) ". , It takes about 0.46 seconds to reproduce once. If this is expressed in frequency, the frequency data for 'Hello World !!' as shown in FIG. 6 is generated.

On the other hand, the frequency generator 12 generates a frequency using an Oscillator of the Web Audio API of the Web-kit, and the Web-kit is a Web-kit supported by Chrome, Firefox, Opera, and Safari. It is possible to increase the bit rate by turning the audible frequency on and off within a short time. In the process of turning on and off the audio, the ticking distance has generated a chitch. To solve this problem, turn off the current frequency immediately before turning on the next frequency Instead, the volume is reduced to zero and then passed to the next frequency, so that no tones are heard. In order to avoid inter-frequency interference, it is desirable to arrange the bandwidth per character as 10 Hz as shown in Fig.

In another embodiment, when the transmitter 1 transmits a frequency as shown in FIG. 7, the character output by the receiver 2 becomes "Ab7!". That is, in this case, the receiver 2 receives four strings at 0.1 second, so that the transmitter 1 can have a 320 bit / s transmission rate, assuming that one character is 1 byte or 8 bits. On the other hand, in the drawing of Fig. 8, the character received in one second becomes " Ab7! Ab7! Ab7! Ab7! Ab7! Ab7! Ab7! Ab7! Ab7! Ab7! Each character is transformed and transmitted by the transmitter 1 at a frequency without limitation of the length of the input character string and each received frequency is converted into a character string by the receiver 2 and outputted .

The PCM output part 13 outputs PCM data (Pulse Code Modulation data) corresponding to the time order of the frequency generated by the frequency generating part 12 as a file or a sound signal type, is stored in the memory 1b of the transmitter 1 and the sound signal is outputted to the outside through the speaker 1c of the transmitter 1. [

Meanwhile, FIG. 9 is a reference diagram showing a test example of a frequency transmitter user interface (frequency transmitter user interface) implemented in an output unit (not shown) of the transmitter 1, which is named Porong Transmitter. Referring to FIG. 7, when an address of a character string to be transmitted is input in (1) and a (2) is pressed, a frequency to be transmitted to an address is generated. Both English and Chinese characters are possible. Hangul is possible by encoding the incoming Hangul value into UTF-8 (Unicode Transformation Format-8).

Meanwhile, FIG. 10 is a graph showing a frequency transmitter spectrum analysis. Referring to FIG. 10, for example, when an address "Beomilro 186 5F Samsung S / W Membership" is input, a frequency of 18,600 Hz is input as a start bit,

A delimiter bit (18,750 Hz) is input as a delimiter to every four characters in the middle, and when the string is input at the end, the end bit (18,900 Hz) is inputted, And the corresponding frequency is reproduced by repeating the time required for the length of the string.

In the above example, 0.01 second for each character string is input 10 times for 4 seconds. Therefore, it takes about 1 second to transmit all addresses with 0.01 second separator bit and 0.01 second end bit. do. (19,360 Hz), e (20,710 Hz), o (21,810 Hz) and m (22,790 Hz) according to the frequency matching table of FIG. Spectrum (Frequency Spectrum) analysis was done. 10 is a frequency analysis of the non-audible sound from the transmitter (1). The Y axis is the gain value and the X axis is the frequency value. It can be confirmed that the transmitter 1 has a good frequency as shown in FIG.

Next, referring to the receiver 2, the receiver 2 is used as a non-audible frequency communication module in the present invention.

The frequency domain filter part 14 receives a sound signal containing data input to a microphone (MIC) 2a of a receiver 2 and / or an external sound signal, To < RTI ID = 0.0 > 18,499 < / RTI > Hz to filter out the required portion of frequencies from 18,500 Hz to 24,000 Hz.

For this purpose, the frequency domain filter part 14 modifies and applies a FFT (Fast Fourier Transform) library.

The FFT is an algorithm for calculating the Fourier transform of discrete data values. The FFT is a set of points (ie, 48 kHz PCM data) of a given finite data It is expressed in the form of separate gain values.

More specifically, before performing FFT processing on raw data, a window function is executed in a preprocessing step. In order to use FFT, a method of processing raw data as much as a predetermined window size to be.

In the case of a general FFT, the DFT (Discrete Fourier Transform) as in the above equation is recursively divided into two DFTs of size n1 and n2, where n = n1 × n2. It can be said that it works. However, since the infinite period can not be seen in a non-ideal situation, a window is designed to process the FFT.

After the above-described FFT process, frequency values ranging from 0 Hz to 24,000 Hz are sampled into 4,800 blocks. Since the sound of the incoming time unit is repeatedly converted and sampled in the frequency unit, the speed of the sampling process is slowed down and divided into blocks as necessary. When sampling is performed with 4,800 blocks, the values of 0 to 5 Hz are stored in the first value, and the values of 23,995 Hz to 24,000 Hz are stored in the 4,800th value, resulting in a total of 4,800 values.

Accordingly, the frequency domain filter part 14 discards the rest of the block values generated by the frequency sampling part 15 only. That is, the frequency domain filter part 14 uses only the frequencies from 18,500 Hz to 23,000 Hz in the currently determined communication protocol, so that only the block values between 3700 and 4600 corresponding to the frequencies are discarded .

The frequency sampling unit 15 samples a frequency of 18,500 Hz to 24,000 Hz among the divided frequency bands in units of 10 Hz.

The Pitch Detection part 16 finds a frequency of decibels larger than a predetermined reference value among frequencies sampled in units of 10 Hz. More specifically, the Pitch Detection part 16 extracts values larger than the average value of each band among the values of the data measured between the values of the data measured each time the thread is threaded, The larger value is used as the measurement data corresponding to the block number. Accordingly, it is preferable that the pitch detector 16 obtains a total of four pick points, one for each frequency band, and uses the measured data as measurement data.

The Pitch Detection part 16 outputs a character through a pick to translate algorithm. More specifically, when the frequency is received for 0.1 second, the pitch detection process proceeds approximately 5 to 6 times, and when the measurement is performed, the character is output according to the pick to translate algorithm (Pick to translate algorithm) .

Substantial data is output by decoding as described above.

If the timing at which the sound signal is read from the receiver 2 to the microphone MIC 2a is not matched with the timing at which the frequency is transmitted from the transmitter 1, . In order to prevent this, a pick to translate algorithm is used. The Pick to translate algorithm first outputs the most measured character value among the accumulated measurement data values (for example, the first A, the second A, If A is 3, B is 6, B is 4 and B is 2, then 'A' is output. If A is 3 and B is 3, (For example, the average peak value of A is 192, and the average of B is 192), and the average value of B 'A' output if the peak value is 180).

The receiver 2 receives the end bit and outputs the string value stored in the list to the output unit (not shown) of the receiver 2. 11A shows the output data (Output Data), FIG. 11B shows the received data (Receive string), and FIG. 11B shows the output data of the test module corresponding to the receiver 2. FIG. Fig.

The present invention can also be embodied as computer-readable codes on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored.

Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device and the like, and also implemented in the form of a carrier wave (for example, transmission over the Internet) .

The computer readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. And functional programs, codes, and code segments for implementing the present invention can be easily inferred by programmers skilled in the art to which the present invention pertains.

As described above, preferred embodiments of the present invention have been disclosed in the present specification and drawings, and although specific terms have been used, they have been used only in a general sense to easily describe the technical contents of the present invention and to facilitate understanding of the invention , And are not intended to limit the scope of the present invention. It is to be understood by those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

1: Transmitter
2: Receiver
10: High Frequency Bandwidth Transmitter / Receiver Module
11: Frequency Matching part
12: Frequency Generator part
13: PCM output part (PCM output part)
14: Frequency Domain Filter part
15: Frequency Sampling part
16: Pitch Detection part

Claims

Data using an invisible frequency band including a transmitter 1 and a receiver 2 for data communication for all characters without distinguishing between English and Hangul using a preset invisible frequency band In the transmission / reception system, the transmitter (1)
When a character string is input by an input unit (not shown), a frequency (frequency) for extracting the frequency of the non-audible frequency band using a frequency matching table matching each character constituting the encoded character string by the encoder 1a A frequency matching part 11;
A frequency generator unit 12 for generating a matching frequency extracted by the frequency matching unit 11; And
PCM data (Pulse Code Modulation data) corresponding to the time order of the frequency generated by the frequency generating unit 12 is output as a file or a sound signal type so that the file is stored in the memory 1b. A PCM output part 13 to be inputted to a microphone (MIC) 2a of a receiver 2 according to an output to the outside through a speaker 1c; And a data transmission / reception system using the non-audible frequency band.

The method according to claim 1,
And the preset non-audible frequency band is 18,500 Hz to 24,000 Hz.

The receiver of claim 2, wherein the receiver (2)
A frequency domain filter part (14) for receiving a sound signal containing data input to the microphone (MIC) (2a) and an external sound signal and discriminating frequencies of a predetermined non-audible frequency band;
A frequency sampling unit 15 for sampling the divided non-audible frequency band in units of a preset frequency; And
After extracting the measurement data according to the pitch detection that finds the frequency at which the decibel corresponding to the numerical value larger than the set reference value among the sampled frequencies among the frequencies received for the predetermined time is picked up, (Pitch Detection part) 16 for outputting characters as a character through an Algorithm; Further comprising:
And outputs substantially data by decoding the received data.

4. The method of claim 3, wherein the Pick to translate Algorithm comprises:
Outputting the largest measured character value among the measured data values while measuring a preset number of times during a predetermined time, and outputting measurement data corresponding to a large average value of peak points when there are the same accumulated characters as a character And the data transmission / reception system using the non-audible frequency band.

When a character string is input to an input unit (not shown), the frequency matching unit 11 generates a frequency matching table (hereinafter referred to as a " frequency matching table ") that matches each character constituting an encoded string by the encoder 1a A first step of extracting a frequency of the non-audible frequency band using a first frequency band;
A second step of generating a matching frequency extracted by the frequency matching unit 11 by the frequency generator unit 12; And
The PCM output part 13 outputs PCM data (Pulse Code Modulation data) corresponding to the time order of the frequency generated by the frequency generating part 12 as a file or a sound signal type, (1b), and outputting the sound signal to the outside through a speaker (1c); And transmitting the data to the base station.