Data sending/receiving method and data transmission system over sound waves

An apparatus for sending data over sound waves, comprising:

• a data acquisition unit configured to obtain to-be-sent data;
• a frequency mapping unit configured to obtain a sound wave frequency sequence corresponding to the to-be-sent data according to a preset sound wave frequency mapping table;
• a signal generation unit configured to generate a filtered sound wave signal sequence according to the sound wave frequency sequence and a preset sending duration, the sending duration being sending duration of a sound wave signal corresponding to a single character;
• and
• a signal sending unit configured to send a sound wave signal corresponding to the to-be-sent data according to the filtered sound wave signal sequence.

A method for receiving data over sound waves, comprising:

• collecting a sound wave signal corresponding to to-be-received data;
• intercepting filtered sound wave signal segments from the collected sound wave signal according to a preset sending duration;
• determining sound wave frequencies corresponding to the filtered sound wave signal segments;
• forming a sound wave frequency sequence corresponding to the to-be-received data by using the sound wave frequencies;
• and
• obtaining the to-be-received data corresponding to the sound wave frequency sequence according to a preset sound wave frequency mapping table.