Multiple description audio coding and decoding method, apparatus, and system

A multiple description audio decoding method, comprising:

• dividing received multiple description bit streams of residual signals into multiple description signal parts having different frequencies;
• decoding the multiple description signal parts having different frequencies by using multiple description methods to obtain residual signal parts having different frequencies;
• and
• combining the obtained residual signal parts having different frequencies to obtain residual signals indicating audio signal information through reconstruction.

A multiple description audio coding apparatus, comprising:

• a frequency band dividing unit, configured to divide residual signals indicating current audio signal information into multiple frequency band parts having different frequencies;
• a multiple description coding (MDC) unit, configured to respectively code, by using MDC methods with different speech quality, the multiple frequency band parts divided by the frequency band dividing unit;
• and
• a bit stream combining unit, configured to combine each of description signal parts that are generated after coding is performed by the MDC unit by using different MDC methods to form multiple description bit streams of the residual signals.

A multiple description audio decoding apparatus, comprising:

• a frequency signal dividing unit, configured to divide received multiple description bit streams of residual signals into multiple description signal parts having different frequencies;
• a multiple description decoding unit, configured to decode the multiple description signal parts having different frequencies by using multiple description methods to obtain residual signal parts having different frequencies;
• and
• a signal combining unit, configured to combine the obtained residual signal parts having different frequencies to obtain residual signals indicating audio signal information through reconstruction.

A multiple description audio coding and decoding system, comprising a multiple description audio coding apparatus and a multiple description audio decoding apparatus,

• wherein the multiple description audio coding apparatus, comprises:
• a frequency band dividing unit, configured to divide residual signals indicating current audio signal information into multiple frequency band parts having different frequencies;
• a multiple description coding (MDC) unit, configured to respectively code, by using MDC methods with different speech quality, the multiple frequency band parts divided by the frequency band dividing unit;
• and
• a bit stream combining unit, configured to combine each of description signal parts that are generated after coding is performed by the MDC unit by using different MDC methods to form multiple description bit streams of the residual signals;
• and
• wherein the multiple description audio decoding apparatus, comprising:
• a frequency signal dividing unit, configured to divide received multiple description bit streams of residual signals into multiple description signal parts having different frequencies;
• a multiple description decoding unit, configured to decode the multiple description signal parts having different frequencies by using multiple description methods to obtain residual signal parts having different frequencies;
• and
• a signal combining unit, configured to combine the obtained residual signal parts having different frequencies to obtain residual signals indicating audio signal information through reconstruction.