Method and system for transmitting audio signal

An audio transmission system for transmitting an audio signal, the system comprising:

• a transmission device comprising:
• a sampling module configured to receive and sample the audio signal, and to record values of points of the sampled audio signal;
• a coding module configured to search all recorded peak values and all recorded valley values of the sampled audio signal, and segment the sampled audio signal into a plurality of frames, wherein one of two adjacent frames ends with a recorded peak value, and the other of the two adjacent frames ends with a recorded valley value;
• the coding module further configured to extract and encode characteristic information from each frame of the sampled audio signal, to obtain a group of generated codes for each frame;
• and
• a transmission module configured to transmit each group of generated codes to a receiving device sequentially;
• and
• the receiving device communicating with the transmission device via a network, the receiving device comprising:
• a receiving module configured to receive each group of generated codes sequentially, and
• a decoding module configured to decode each group of generated codes, to obtain a decoded audio signal.