KR20040013560A - Method for synchronizing among terminals and apparatus thereof - Google Patents

Abstract

PURPOSE: A method for synchronizing between the terminal devices and an apparatus for the same are provided to realize multi synchronization without increasing a frequency band. CONSTITUTION: A method for synchronizing between the terminal devices includes the steps of: selecting two frequencies at a predetermined frequency bandwidth in the audio information signal(510-520); generating data related to the synchronization signal and the audio information signal(530); mixing the data with the audio information signal by using the two frequencies as a carrier wave(550-560).

Description

Method for synchronizing among terminals and apparatus thereof

TECHNICAL FIELD The present invention relates to the field of synchronizing between a computer and a terminal device such as a computer or a PDA, and more particularly, to a method and apparatus for synchronizing between a server computer and a user computer or a user computer and a mobile communication terminal using a microphone and a speaker It is about.

1 is a view showing a connection configuration for synchronization between a conventional computer and the terminal device.

Conventionally, in order to synchronize a computer and a terminal device, an infrared data association (IrDA) communication port, USB (universal serial bus) or serial port (serial port) is used to transmit data using a wireless LAN and infrared rays.

In order to transmit data by connecting to a wireless LAN or IrDA communication port between the computer 121 and the terminal device 123 connected to the web server 110 and the Internet, an AP (access) when synchronizing using a wireless LAN card point) or additional wireless LAN card is required, and the same number of frequency bands of terminal equipment are required for one-to-many synchronization, so additional investment of cost is incurred and when using the IrDA communication port, it is secured with distance limitation and straightness. Should be.

In case of transferring data between the computer 131 and the terminal device 131 by using a USB or serial port, there is a limitation of distance by using a wire and a physical addition such as a cradle or a connection cable is required. . In case of transmitting data between the web server 110 and the terminal devices 141 and 143 connected to the Ethernet, a lot of bandwidth is required.

The present invention has been made in an effort to provide a method and apparatus for synchronizing a signal output through a speaker of a server computer to a microphone included in a user computer or a mobile terminal in order to solve the above problems.

Another object of the present invention is to provide a computer-readable recording medium having recorded thereon a program for executing the method on a computer.

1 is a view showing a connection configuration for synchronization between a conventional computer and the terminal device.

2 is a diagram illustrating a structure diagram for synchronizing a server computer, a user computer, and a mobile terminal according to the present invention.

3 is a diagram illustrating an embodiment of a server computer and a user computer for transmitting data using a speaker and a microphone according to the present invention.

4 is a diagram illustrating sound signals and data (information related to sound signals, for example, information of a singer associated with playing an MP3 or CD, URLs of related sites, etc.) in a method of transmitting synchronization signals and data according to the present invention. It is a figure which shows the frequency band of the mixed signal.

5 is a flowchart illustrating a method of synchronizing data performed in a server computer according to the present invention.

6 is a flowchart illustrating a method of synchronizing data performed in a user computer according to the present invention.

7 is a diagram illustrating a configuration of a data frame for data carried on two carriers in a method for synchronizing between a server computer and a user computer according to the present invention.

According to an aspect of the present invention, there is provided a method of synchronizing a server computer with a user computer or a mobile terminal period, the method comprising: (a) selecting two frequencies in a predetermined frequency band from an acoustic information signal; (b) a synchronization signal and the Generating data related to an acoustic information signal; and (c) mixing the data with the acoustic information signal using the two frequencies as carriers.

According to an aspect of the present invention, there is provided a method of synchronizing a server computer with a user computer or a mobile terminal, the method comprising: (a) analyzing a frequency of an input sound information signal; (b) a predetermined frequency in the analyzed frequency band Selecting two bands having frequencies; (c) extracting data to be synchronized from the sound information; and (d) organizing the data into frames.

According to another aspect of the present invention, there is provided a synchronization device for synchronizing between a server computer and a user computer, the apparatus comprising: a frequency selector configured to select two frequencies from a predetermined frequency band from an acoustic information signal; And a frame mixing unit configured to mix the data with the sound information signal using the two frequencies as carriers.

Synchronizing apparatus for synchronization between the server computer and the user computer according to the present invention for achieving the above object, Frequency analysis unit for analyzing the frequency of the received sound information signal; 2 having a predetermined frequency in the analyzed frequency band A frequency selection unit for selecting two bands; A data extraction unit for extracting data to be synchronized from the sound information; Frame reconstruction unit for configuring the data into a frame.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

2 is a diagram illustrating a structure for synchronization between the server computer 211, the user computer 221 and the mobile terminal 310 according to the present invention, the server computer 211 and the user computer 221 is the same model In this case, the user computer 221 may serve as a server.

When the speaker 215 of the server computer outputs an acoustic information signal including the synchronization signal, the microphone 223 of the user computer receives the acoustic information signal, and the user computer 221 performs frequency analysis on the acoustic information signal. The data will be extracted. If the speaker 225 of the user computer outputs an acoustic information signal, the microphone 213 of the server computer receives it and extracts data from the server computer 211.

A microphone and a speaker may also be used to transmit the acoustic information signal including the synchronization signal between the mobile terminal device 310 and the server computer 211.

3 is a view showing an embodiment of a synchronization device for synchronization between a server computer and a user computer for transmitting data using a speaker and a microphone according to the present invention, the user computer is a mobile communication device such as a PDA It may be.

The synchronization device 310 of the server computer analyzes the frequency by performing a discrete Fourier transform on the acoustic information signal to be transmitted to the synchronization device 320 of the user computer, and the frequency selector 312 uses a microphone. The received ambient sound information is analyzed by frequency using discrete Fourier transform to select two frequencies with the lowest level among frequencies in the range of 16 [Khz] to 20 [Khz]. The sync signal generator 313 generates a sync signal of the data frame, and the error check generator 314 generates an error check bit for the data. The frame configuration unit 315 configures a data frame with a synchronization signal, data to be transmitted, and an error check bit. One embodiment of a data frame is shown in FIG.

The data mixing unit 316 mixes a sound information signal and a data frame to be transmitted. The data premix is mixed using two frequencies selected by the frequency selecting unit 312 as a carrier frequency. The speaker 317 outputs the mixed signal and the microphone receives the signal output from the speaker 326 of the user computer. The specifications of the speakers 317 and 327 can be reproduced up to 20 [KHz], and the microphones 318 and 328 can sound up to 20 [KHz].

In the synchronization device 320 of the user computer, the microphone 327 receives the mixed signal and the synchronization signal detector 321 transmits the synchronization signal promised between the synchronization device 310 of the server computer and the synchronization device 320 of the user computer. Detect if present. When it is detected that there is a synchronization signal, the frequency analyzer 322 discretely Fourier transforms the received signal, and the frequency selector 323 converts two frequencies having the largest amplitude according to the frequency from 16 [Khz] to 20 [Khz]. Choose from the range. The data extraction unit 324 stores data contained in two frequencies in a buffer and extracts data. The error checking execution unit 325 performs error checking on the extracted data. If the error check does not pass, the data is deleted. The frame reconstruction unit 326 reconstructs the extracted data into meaningful values of 0 and 1.

4 is a diagram illustrating sound signals and data (information related to sound signals, for example, information of a singer associated with playing an MP3 or CD, URLs of related sites, etc.) in a method of transmitting synchronization signals and data according to the present invention. In the figure showing the frequency bands of the mixed signals, the vertical and horizontal axes represent frequency and time [sec], respectively.

In the range 417 of the frequency band 16 [KHz] to 20 [KHz], the synchronization signals 411 and 413 and the data 415 related to music are carried on two frequencies not disturbed by the ambient noise. Transmit with general sound signal 419.

5 is a flowchart illustrating a method of synchronizing data performed in a server computer according to the present invention.

The frequency analyzer 311 of the synchronization device 310 of the server computer checks the environment of the frequency with respect to the acoustic information signal and performs frequency analysis (step 510). The frequency selector 312 selects two optimal frequencies from 16 [KHz] to 20 [KHz] of the audible frequency band (step 520). The synchronization signal generator 313 generates a synchronization signal, and the frame configuration unit 315 generates data to be synchronized (step 530). If there is no more data to be synchronized, the synchronization signal generation unit 313 generates a synchronization termination signal (step 540), and the data mixing unit 316 mixes data to be synchronized with the sound information signal to be transmitted (step 540). In step 560, the transmission is performed.

6 is a flowchart illustrating a method of synchronizing data performed in a user computer according to the present invention.

The synchronization signal detector 321 of the synchronization device 320 of the user computer detects the synchronization signal from the signal transmitted from the synchronization device 310 of the server computer (step 610). When the synchronization signal is detected, the frequency analyzer 322 analyzes the acoustic information signal, which is sound information received through the microphone, in the frequency domain (step 620), and the frequency selector 323 is 16 [KHz] to 20 [KHz]. In operation 630, two frequencies having a large edge are selected in the frequency band within the range. The data extractor 324 demodulates the data contained in the two carriers to extract data (step 640), and the error check execution unit 325 checks an error bit for the extracted data (step 650). The frame reconstruction unit 326 reconstructs the data that has passed the error check into meaningful values composed of 0's and 1's (that is, data having the same sequence as the data transmitted from the server computer) (step 660).

7 is a diagram showing the configuration of a data frame for data carried on two carriers in a method for synchronizing between a server computer and a user computer according to the present invention, wherein a synchronization signal field, a data field, an error check field, and synchronization completion are shown. It consists of a signal field.

The invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, hard disk, floppy disk, flash memory, optical data storage device, and also carrier waves (for example, transmission over the Internet). It also includes the implementation in the form of. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

As described above, according to the present invention, one-to-many motive is increased without additional infrastructure and cost investment or increase in bandwidth, and one-to-many motive through mass media, between computers used by teachers and students in educational institutions. In the product market, the product-related information can be utilized as a method of maximizing the advertising effect by loading sound and audio watermarked information. In addition, due to the characteristics of HTML and XML, in the environment of the Internet infrastructure, a lot of information can be delivered even with a short address for the link. Therefore, the company synchronizes the product related information and the homepage address with the background music of the related advertisements, It can be used as a means, and by exchanging information in a frequency band that people do not feel without wire connection, data synchronization is possible without extending the frequency band when teachers and students connect one-to-many like a school.

Claims (13)

(a) selecting two frequencies in a predetermined frequency band from the acoustic information signal; (b) generating data related to the synchronization signal and the acoustic information signal; And and (c) mixing the data with the sound information signal using the two frequencies as carriers. The method of claim 1, wherein step (a) A method of one-to-many synchronization between a server and a terminal device, wherein two frequencies are selected from the audible frequency band in a range of 16 [Khz] to 20 [Khz] without being disturbed by ambient noise. The method of claim 1, wherein step (b) And generating an error bit field for checking an error bit rate for the data. (a) analyzing the frequency of the received sound information signal; (b) selecting two bands having a predetermined frequency from the analyzed frequency band; (c) extracting data to be synchronized from the sound information; And and (d) organizing the data into frames. The method of claim 1, wherein step (a) And detecting a synchronization signal from the received sound information signal and performing discrete Fourier transform on the sound information signal to analyze frequency components. The method of claim 1, wherein step (b) The one-to-many synchronization method between the server and the terminal device, characterized in that the two frequencies with the largest energy in the analyzed frequency band to select from 16 [Khz] to 20 [Khz]. The method of claim 1, wherein step (c) And performing an error bit check on the extracted data. A frequency selecting unit for selecting two frequencies in a predetermined frequency band from the acoustic information signal; A frame configuration unit generating data related to the sound information signal; And And a data mixing unit which mixes the data with the acoustic information signal using the two frequencies as carrier waves. The method of claim 1, And a synchronization signal generator for generating a synchronization signal. The method of claim 1, And an error check generation unit for generating an error check field for the data. A frequency analyzer for analyzing a frequency of the received sound information signal; A frequency selector which selects two bands having a predetermined frequency from the analyzed frequency band; A data extraction unit for extracting data to be synchronized from the sound information; And And a frame reconstructing unit for organizing the data into frames. The method of claim 11, And an error check execution unit for performing an error bit check on the data extracted by the data extraction unit. A computer-readable recording medium having recorded thereon a program for executing the method of any one of claims 1 to 7.