Coding method, coder and decoder for digital signal, and recording medium for coded information information signal

A coder for coding a digital signal comprising:

• quantization accuracy information generating means for generating first quantization accuracy information;
• means for generating second quantization accuracy information;
• means for carrying out quantization of said digital signal with a quantization accuracy determined by said first quantization accuracy information and said second quantization accuracy information;
• and
• means for sending said second quantization accuracy information to a decoder.

A decoder for decoding a coded information signal produced when a digital signal is coded by a coder generating coder-generated first quantization accuracy information and coder-generated second quantization accuracy information, said decoder comprising:

• means for receiving said coded information signal from the coder;
• quantization accuracy information generating means generating decoder-generated first quantization accuracy information;
• and
• means for determining a quantization accuracy of said digital signal with the quantization accuracy of said digital signal being determined by said decoder-generated first quantization accuracy information outputted from said quantization accuracy information generating means and said coder-generated second quantization accuracy information sent from said coder.