US RE41,370 E1 · Adaptive transform coding system, adaptive transform decoding system and adaptive transform coding/decoding system

Abstract

In an adaptive transform coding system and/or and adaptive transform decoding system, coding efficiency in the case where a small number of quantized values having large absolute value are present, is improved. The adaptive transform coding system codes the small number of quantized values having large absolute values and other quantized values are coded separately. More particularly, the adaptive transform coding system includes a selector (6) discriminating the small number of quantized value having large absolute value from other quantized value, a pulse coding means for coding the small number of quantized values having large absolute values (8) and the pulse decoding means (16) for decoding the same, a coding means (7) for coding the quantized value other than those having large absolute values and a decoding means (15) decoding the same, and a synthesis means (18) for synthesizing the small number of quantized values having large absolute value and other quantized values.

Claims49

Dependent claims

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.

8 more elements

An adaptive transform coding and decoding 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 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;
a multiplexer for multiplexing said first code, said second code and said third code to generate a bit stream
a demultiplexer for separating an input signal into a first code, a second code and a third code;
a first decoding means for decoding said first code with reference to said second code to derive a first signal;
a second decoding means for decoding said second code to derive a second signal;
a parameter decoding means for decoding said third signal to derive a quantization step size;
a synthesis means for synthesizing said first signal and said second signal for deriving a synthesized signal;
an inverse quantizing means for inverse quantizing said quantized value of said synthesized signal to derive an inverse quantized signal;
and
an inverse transform means for transforming said inverse quantized signal into a time domain to derive a time domain signal.

15 more elements

A system including an encoding system and a decoding system, said encoding ststem comprising:

replacing means for replacing a portion of a signal with a replaced element with a different amplitude from that of said portion;
first encoding means for encoding the difference in amplitudes between said portion and the replaced element into a first code and for encoding the position information of said replaced element in said signal into a second code;
and
multiplexing means for multiplexing said first code and said second code to generate a bitstream;
and
said decoding system comprising:
demultiplexing means for demultiplexing said bitsteam into said first code and said second code;
first decoding means for decoding said first code to generate the difference in amplitudes between said portion and said replaced element and decoding said second code to generate said position information of said replaced element in said signal;
and
reconstructing means for reconstructing said portion of said signal,
wherein said portion is identified by said position information and the amplitude of said portion is modified using said amplitude information that represents the difference in amplitudes between said portion of said signal and said element.

8 more elements

A system including an encoding system and a decoding system,

said encoding system comprising:
a selector that replaces a portion of a signal with a replaced element with a different amplitude from that of said portion;
a pulse coding unit that that encodes the difference in amplitudes between said portion and the replaced element into a first code and for encoding the position information of said replaced element in said signal into a second code;
and
a multiplexer that multiplexes said first code and said second code to generate a bitstream;
and
said decoding system comprising:
a demultiplexer that demultiplexes said bitsteam into said first code and said second code;
and
a pulse decoding unit that decodes said first code to generate the difference in amplitudes between said portion and said replaced element and decodes said second code to generate said position information of said replaced element in said signal;
and
wherein said pulse decoding unit reconstructs said portion of said signal,
wherein said portion is identified by said position information and the amplitude of said portion is modified using said amplitude information that represents the difference in amplitudes between said portion of said signal and said replaced element.

10 more elements

Dependencies are inferred from the claim text.

Adaptive transform coding system, adaptive transform decoding system and adaptive transform coding/decoding system

Life of this patent

Adaptive transform coding system, adaptive transform decoding system and adaptive transform coding/decoding system

Life of this patent

Abstract

Claims49