Decoding apparatus, encoding apparatus, decoding method and encoding method

A decoding apparatus comprising:

• a first decoding part for decoding a code word obtained by encoding an input signal using a Code-Excited Linear Prediction encoding method;
• a second decoding part for decoding a code word obtained by encoding a signal with an encoding method other than said Code-Excited Linear Prediction encoding method;
• and
• a rising-transition detection and notification part comprising:
• a detection part that detects the existence of a rising-transition of amplitude of said input signal based on time variation of a decoded signal waveform obtained by said first decoding part;
• and
• a notification part that notifies said second decoding part that said rising-transition of said amplitude exists.

An encoding apparatus comprising:

• a first encoding part for encoding an input signal to a code word using a Code-Excited Linear Prediction encoding method;
• a second encoding part for encoding a signal to a code word using an encoding method other than said Code-Excited Linear Prediction encoding method;
• and
• a rising-transition detection and notification part comprising:
• a detection part that detects the existence of a rising-transition of amplitude of said input signal based on time variation of a gain of excitation vectors obtained by said first encoding part;
• and
• a notification part that notifies said second encoding part that said rising-transition of said amplitude exists.

An encoding apparatus comprising:

• a first encoding part for encoding an input signal to a code word using a Code-Excited Linear Prediction encoding method;
• a second encoding part for encoding a signal to a code word using an encoding method other than said Code-Excited Linear Prediction encoding method;
• and
• a rising-transition detection and notification part comprising:
• a detection part that detects the existence of a rising-transition of amplitude of said input signal based on time variation of a gain of excitation vectors obtained by said first encoding part;
• and
• a notification part that notifies a decoding side that said rising-transition of said amplitude exists as a part of encoded information.

An encoding apparatus comprising:

• a first encoding part for encoding an input signal to a code word using a Code-Excited Linear Prediction encoding method;
• a second encoding part for encoding a signal to a code word using an encoding method other than said Code-Excited Linear Prediction encoding method;
• and
• a rising-transition detection and notification part comprising:
• a detection part that detects the existence of a rising-transition of amplitude of said input signal based on time variation of a local decoded signal obtained by said first encoding part;
• and
• a notification part that notifies said second encoding part that said rising-transition of said amplitude exists.

An encoding apparatus comprising:

• a first encoding part for encoding an input signal to a code word using a Code-Excited Linear Prediction encoding method;
• a second encoding part for encoding a signal to a code word using an encoding method other than said Code-Excited Linear Prediction encoding method;
• and
• a rising-transition detection and notification part comprising:
• a detection part that detects the existence of a rising-transition of amplitude of said input signal based on time variation of a local decoded signal obtained by said first encoding part;
• and
• a notification part that notifies a decoding side that said rising-transition of said amplitude exists as a part of encoded information.

A decoding method comprising:

• a first decoding step for decoding a code word obtained by encoding an input signal using a Code-Excited Linear Prediction encoding method;
• a second decoding step for decoding a code word obtained by encoding a signal with an encoding method other than said Code-Excited Linear Prediction encoding method;
• and
• a rising-transition detection and notification step comprising:
• a detection sub-step that detects the existence of a rising-transition of amplitude of said input signal based on time variation of a gain of excitation vectors obtained by said first decoding step;
• and
• a notification sub-step that notifies said second decoding step that said rising-transition of said amplitude exists.

A decoding method comprising:

• a first decoding step for decoding a code word obtained by encoding an input signal using a Code-Excited Linear Prediction encoding method;
• a second decoding step for decoding a code word obtained by encoding a signal with an encoding method other than said Code-Excited Linear Prediction encoding method;
• and
• a rising-transition detection and notification step comprising:
• a detection sub-step that detects the existence of a rising-transition of amplitude of said input signal based on time variation of a decoded signal waveform obtained by said first decoding step;
• and
• a notification sub-step that notifies said second decoding step that said rising-transition of said amplitude exists.

An encoding method comprising:

• a first encoding step for encoding an input signal to a code word using a Code-Excited Linear Prediction encoding method;
• a second encoding step for encoding a signal to a code word using an encoding method other than said Code-Excited Linear Prediction encoding method;
• and
• a rising-transition detection and notification step comprising:
• a detection sub-step that detects the existence of a rising-transition of amplitude of said input signal based on time variation of a gain of excitation vectors obtained by said first encoding step;
• and
• a notification sub-step that notifies said second encoding step that said rising-transition of said amplitude exists.

An encoding method comprising:

• a first encoding step for encoding an input signal to a code word using a Code-Excited Linear Prediction encoding method;
• a second encoding step for encoding a signal to a code word using an encoding method other than said Code-Excited Linear Prediction encoding method;
• and
• a rising-transition detection and notification step comprising:
• a detection sub-step that detects the existence of a rising-transition of amplitude of said input signal based on time variation of a gain of excitation vectors obtained by said first encoding step;
• and
• a notification sub-step that notifies a decoding side that said rising-transition of said amplitude exists as a part of encoded information.

An encoding method comprising:

• a first encoding step for encoding an input signal to a code word using a Code-Excited Linear Prediction encoding method;
• a second encoding step for encoding a signal to a code word using an encoding method other than said Code-Excited Linear Prediction encoding method;
• and
• a rising-transition detection and notification step comprising:
• a detection sub-step that detects the existence of a rising-transition of amplitude of said input signal based on time variation of a local decoded signal obtained by said first encoding step;
• and
• a notification sub-step that notifies said second encoding step that said rising-transition of said amplitude exists.

An encoding method comprising:

• a first encoding step for encoding an input signal to a code word using a Code-Excited Linear Prediction encoding method;
• a second encoding step for encoding a signal to a code word using an encoding method other than said Code-Excited Linear Prediction encoding method;
• and
• a rising-transition detection and notification step comprising:
• a detection sub-step that detects the existence of a rising-transition of amplitude of said input signal based on time variation of a local decoded signal obtained by said first encoding step;
• and
• a notification sub-step that notifies a decoding side that said rising-transition of said amplitude exists as a part of encoded information.