Signal coding system

A signal coding system for coding an input signal, said signal coding system comprising:

• a spectral parameter calculating circuit which derives a spectral parameter of said input signal;
• a predicting circuit which derives a predictive residual error based upon a result of a prediction of said input signal;
• an orthogonal transformation circuit which derives an orthogonal transformation coefficient by performing an orthogonal transformation on said predictive residual error;
• a coefficient calculating circuit which calculates a plurality of calculated coefficients by expressing a fine structure of a plurality of said orthogonal transformation coefficients;
• and
• a quantizer which quantizes said orthogonal transformation coefficients by expressing said orthogonal transformation coefficients as a plurality of pulses thereby producing a quantization result, said quantizer further outputs a combination of said spectral parameter, said calculated coefficients and said quantization result.

A signal coding system for coding an input signal, said signal coding system comprising:

• a spectral parameter calculating circuit which derives a spectral parameter of said input signal;
• a predicting circuit which derives a predictive residual error based upon a result of a prediction of said input signal;
• an orthogonal transformation circuit which derives an orthogonal transformation coefficient by performing an orthogonal transformation on said predictive residual error;
• a coefficient calculating circuit which calculates a plurality of calculated coefficients by expressing a fine structure of a plurality of said orthogonal transformation coefficients;
• a quantizer which quantizes said orthogonal transformation coefficients by expressing said orthogonal transformation coefficients as a plurality of pulses thereby producing a quantization result, said quantizer further outputs a combination of said spectral parameter, said calculated coefficients and said quantization result;
• and
• a level calculator which divides each orthogonal transformation coefficient derived by said orthogonal transformation circuit by a predetermined number and determines an average level for a plurality of said orthogonal transformation coefficients after said orthogonal transformation coefficients are divided by said predetermined number;
• wherein said coefficient calculating circuit further expresses an envelop of said average level derived by said level calculator using said plurality of calculated coefficients.

A method for coding an input signal, said method comprising the acts of:

• deriving a spectral parameter of said input signal;
• deriving a predictive residual error based upon a result of a prediction of said input signal;
• performing an orthogonal transformation on said predictive residual error to produce an orthogonal transformation coefficient;
• representing an envelop of a plurality of said orthogonal transformation coefficients as a plurality of calculated coefficients;
• quantizing said orthogonal transformation coefficients by expressing said orthogonal transformation coefficients as a plurality of pulses thereby producing a quantization result;
• outputting a combination of said spectral parameter, said calculated coefficients and said quantization result;
• and
• coding said input signal using said combination.