Method and device for pulse encoding, method and device for pulse decoding

A non-transitory computer readable medium having computer executable program codes stored thereon for use by an audio signal encoder, wherein the program codes comprise instructions for:

• receiving an input audio signal;
• extracting information of pulses on a track of the audio signal, wherein the information of the pulses comprises:
• number of the pulses, positions of the pulses on the track, and symbols of the pulses;
• determining an index value corresponding to the information of the pulses;
• determining an initial number of bits for encoding the index value;
• comparing the index value with an adjustment threshold value;
• when the index value is smaller than the adjustment threshold value, encoding the index value using a reduced number of bits, or
• when the index value is not smaller than the adjustment threshold value, encoding the index value plus an offset value using the initial number of bits;
• and
• transmitting the encoded index value to a decoding side,
• wherein the reduced number of bits is smaller than the initial number of bits, and the initial number of bits and the reduced number of bits are both positive integers,
• and wherein the offset value is greater than or equal to the adjustment threshold value.