Patent ID: RE41370

Claim:
An adaptive transform coding system comprising: a transform means for transforming an input signal into a frequency domain signal; an analysis means for analyzing said input signal and said frequency domain signal to derive an allowable quantization error; a quantizing means for quantizing the amplitude value of said frequency domain signal on the basis of a quantization step size to derive a quantized value and a quantization error, a quantization parameter determining means for determining said quantization step size with reference to said allowable quantization error and said quantization error and a total code amount; a selector for analyzing the quantized value of said frequency domain signal to derive a first signal and a second signal; a first coding means for coding said quantized value of said first signal with reference to said second signal to derive a first code and a first code amount; a second coding means for coding said quantized value of said second signal to derive a second code and a second code amount; a parameter coding means for coding said quantization step size to derive a third code and a third code amount; an adder for deriving said total code amount of said first code amount, said second code amount and said third code amount; and a multiplexer for multiplexing said first code, said second code and said third code to generate a bit stream.