Method and device for sending and receiving data

A data sending device, comprising:

• a bit sequence generating unit configured to generate and output a bit sequence of data to be sent;
• and
• a wave generating and sending unit configured to transmit data bit 1 by a first periodic wave with a period T1, to transmit data bit 0 by a second periodic wave with a period T2 which is unequal to period T1, wherein the second periodic wave is other than the first periodic wave, and the wave generating and sending unit sends continuously a corresponding periodic wave according to the bit sequence of the data to be sent,
• wherein the bit sequence generating unit is configured to generate the following bit sequence of data to be sent:
• a synchronous head, a character to be transmitted and a synchronous tail;
• the synchronous head has M bits and M is greater than or equal to 2, bit values of the M bits of the synchronous head are the same;
• the character to be transmitted contains a character in the data to be sent;
• the synchronous tail has N bits and N is greater than or equal to 2, bit values of the N bits of the synchronous tail are the same.

A method for receiving data, comprising:

• receiving continuously a periodic wave;
• and
• determining a bit sequence of received data according to a period of the periodic wave, wherein data bit 1 is transmitted by the periodic wave with a period T1, data bit 0 is transmitted by the periodic wave with a period T2, and T1 is unequal to T2,
• wherein the periodic wave with period T1 is other than the periodic wave with period T2, and the bit sequence of the received data comprises successively a synchronous head, a character to be transmitted and a synchronous tail;
• the synchronous head has M bits and M is greater than or equal to 2, bit values of the M bits of the synchronous head are the same;
• the synchronous tail has N bits and N is greater than or equal to 2, bit values of the N bits of the synchronous tail are the same.