Method and device for unified time-domain / frequency domain coding of a sound signal

A coding method capable of operating in time domain and frequency domain for coding an input sound signal, comprising:

• classifying the input sound signal into one of a plurality of sound signal categories, wherein the sound signal categories comprise a speech category, a music category and a signal type category showing that the input sound signal is not classified as speech nor music;
• selecting one of a plurality of coding sub-modes for coding the input sound signal if the input sound signal is classified in the signal type category showing that the input sound signal is not classified as speech nor music, wherein the plurality of coding sub-modes are designed for coding the input sound signal classified in the signal type category showing that the input sound signal is not classified as speech nor music;
• and
• coding the input sound signal using the selected coding sub-mode, comprising calculating and mixing time domain and frequency domain contributions for coding the sound signal.

A coding device capable of operating in time domain and frequency domain for coding an input sound signal, comprising:

• a classifier of the input sound signal into one of a plurality of sound signal categories, wherein the sound signal categories comprise a speech category, a music category and a signal type category showing that the input sound signal is not classified as speech nor music;
• a selector of one of a plurality of coding sub-modes for coding the input sound signal if the input sound signal is classified in the signal type category showing that the input sound signal is not classified as speech nor music, wherein the plurality of coding sub-modes are designed for coding the input sound signal classified in the signal type category showing that the input sound signal is not classified as speech nor music;
• and
• an encoder configured to calculate and mix both time domain and frequency domain contributions for coding the input sound signal using the selected coding sub-mode.

A coding device capable of operating in time domain and frequency domain for coding an input sound signal, comprising:

• at least one processor;
• and
• a memory coupled to the processor and storing non-transitory instructions that when executed cause the processor to:
• classify the input sound signal into one of a plurality of sound signal categories, wherein the sound signal categories comprise a speech category, a music category and a signal type category showing that the input sound signal is not classified as speech nor music;
• select one of a plurality of coding sub-modes for coding the input sound signal if the input sound signal is classified in the signal type category showing that the input sound signal is not classified as speech nor music, wherein the plurality of coding sub-modes are designed for coding the input sound signal classified in the signal type category showing that the input sound signal is not classified as speech nor music;
• and
• code the input sound signal using the selected coding sub-mode, comprising calculating and mixing time domain and frequency domain contributions for coding the input sound signal.

A sound signal decoder comprising:

• at least one processor;
• and
• a memory coupled to the processor and storing non-transitory instructions that when executed cause the processor to implement:
• a receiver of a bitstream conveying information usable to reconstruct a synthesis filter excitation formed from time domain and frequency domain excitation contributions and representative of a sound signal classified in a signal type category showing that the sound signal is not classified as speech nor music, wherein the information includes one of a plurality of coding sub-modes used for coding the sound signal classified in the unclear signal type category showing that the sound signal is not classified as speech nor music and wherein the plurality of coding sub-modes are designed for coding the sound signal classified in the signal type category showing that the sound signal is not classified as speech nor music;
• a re-constructor of the synthesis filter excitation in response to the information conveyed in the bitstream, including the coding sub-mode used for coding the sound signal;
• a converter of the synthesis filter excitation to time domain;
• and
• a synthesis filter for filtering the synthesis filter excitation converted to time domain to produce a synthesized version of the sound signal.

A sound signal decoding method comprising:

• receiving a bitstream conveying information usable to reconstruct a synthesis filter excitation formed from time domain and frequency domain excitation contributions and representative of a sound signal classified in a signal type category showing that the sound signal is not classified as speech nor music, wherein the information includes one of a plurality of coding sub-modes used for coding the sound signal classified in the signal type category showing that the sound signal is not classified as speech nor music and wherein the plurality of coding sub-modes are designed for coding the sound signal classified in the signal type category showing that the sound signal is not classified as speech nor music;
• reconstructing the synthesis filter excitation in response to the information conveyed in the bitstream, including the coding sub-mode used for coding the sound signal;
• converting the synthesis filter excitation to time domain;
• and
• filtering the synthesis filter excitation converted to time domain through a synthesis filter to produce a synthesized version of the sound signal.

A sound signal decoder comprising:

• a receiver of a bitstream conveying information usable to reconstruct a synthesis filter excitation formed from time domain and frequency domain excitation contributions and representative of a sound signal classified in a signal type category showing that the sound signal is not classified as speech nor music, wherein the information includes one of a plurality of coding sub-modes used for coding the sound signal classified in the signal type category showing that the sound signal is not classified as speech nor music and wherein the plurality of coding sub-modes are designed for coding the sound signal classified in the signal type category showing that the sound signal is not classified as speech nor music;
• a re-constructor of the synthesis filter excitation in response to the information conveyed in the bitstream, including the coding sub-mode used for coding the sound signal;
• a converter of the synthesis filter excitation to time domain;
• and
• a synthesis filter for filtering the synthesis filter excitation converted to time domain to produce a synthesized version of the sound signal.

A sound signal decoder comprising:

• at least one processor;
• and
• a memory coupled to the processor and storing non-transitory instructions that when executed cause the processor to:
• receive a bitstream conveying information usable to reconstruct a synthesis filter excitation formed from time domain and frequency domain excitation contributions and representative of a sound signal classified in a signal type category showing that the sound signal is not classified as speech nor music, wherein the information includes one of a plurality of coding sub-modes used for coding the sound signal classified in the signal type category showing that the sound signal is not classified as speech nor music and wherein the plurality of coding sub-modes are designed for coding the sound signal classified in the signal type category showing that the sound signal is not classified as speech nor music;
• reconstruct the synthesis filter excitation in response to the information conveyed in the bitstream, including the coding sub-mode used for coding the sound signal;
• convert the synthesis filter excitation to time domain;
• and
• filter the synthesis filter excitation converted to time domain through a synthesis filter to produce a synthesized version of the sound signal.