| 摘要 |
PURPOSE:To obtain a dynamic range equivalent to an input signal by executing adaptively the quantization from the relation of the input signal and a quantizing noise. CONSTITUTION:To the upper limit of the dynamic range of an input signal X, the range and the lower limit of the value smaller than the upper limit only by a maximum quantization noise and the scope of the value larger than the lower limit only by the maximum quantization noise, a means 3 outputting a converting signal subjected to the quantization conversion of the input signal X in accordance with the characteristic specified beforehand is provided. The quantizer has a means 4 to quantize and output adaptively a difference signal E so that a value adding a quantizing noise to the above-mentioned input signal X by using the difference signal E and a converting signal does exceed the dynamic range of the input signal X. Thus, a decoding signal having a dynamic range equivalent to the input signal receiving no amplitude limit can be obtained. |
