System and method for data reception and transmission in audible frequency band

A data receiving apparatus for acoustic communication, the data receiving apparatus comprising:

• a synchronization part receiving an audio signal including additional data to perform synchronization through a matched filtering;
• a time section selection part to select a time section including the additional data from among time sections of the synchronized audio signal by extracting synchronization data from the audio signal including the additional data and detecting an insertion position of the synchronization data;
• a frequency-axis transform part to transform a time-axis signal of the time section including the additional data into a frequency-axis signal;
• and
• a data extracting part comprising:
• a frequency conversion part that selects a frequency band to input data including the additional data for acoustic communication based on the frequency-axis signal by determining a phase of a plurality of subject frequencies constituting the frequency-axis signal and selecting a subject frequency having the phase corresponding to a preset phase as the selected frequency band for data extraction;
• and
• a time-axis inverse transform part to inversely transform the frequency-axis signal into the time-axis signal to generate the audio signal including the additional data for data extraction based on the frequency-axis signal, with said data extraction part extracting the data including the additional data through predetermined data extraction processing.

A method of transceiving data for acoustic communication, the method comprising the steps of:

• inputting audio data including additional data for acoustic communication into an audio signal, with the data input step comprising;
• transforming a time-axis signal of the audio signal into a frequency-axis signal without conversion of the audio signal to a digital signal;
• establishing a group section including a plurality of N frequency groups
• selecting a frequency band from the plurality of N frequency groups having a predetermined frequency range based on the frequency axis signal so as to input the data including the additional data for the acoustic communication according to the frequency band selection;
• calculating the power intensity of each frequency in each group;
• determining the frequency band for data input by checking whether the calculated power intensity is higher than a predetermined level;
• converting a subject frequency corresponding to the selected frequency band to input the data and additional data according to formation of the data;
• inversely transforming the frequency-axis signal into the time-axis signal to generate the audio signal including the additional data, and with said method further comprising;
• determining time sections having a level suitable for inputting the data including the additional data based on the power intensity of each of the N sections of the time axis signal and a signal output part for transmitting the audio signal including the additional data in an audio frequency band;
• receiving the audio signal including the additional data to perform synchronization through a matched filtering;
• and
• extracting the data by detecting the phase of the subject frequencies constituting the frequency-axis signal and selecting the frequency band for data extraction based on the detected phase.