Coding/decoding method, system and apparatus

• US 8,775,166 B2
• Filed: 08/14/2009
• Issued: 07/08/2014
• Est. Priority Date: 02/14/2007
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Wan, Hualin, Zhang, Libin
• Primary Examiner(s): GUERRA-ERAZO, EDGAR X
• Application Number:
  US12/541,298
• Publication Number:
  US 20100042416A1
• Time in Patent Office: 1,789 Days
• Field of Search: 704/201, 704/205, 704/225, 704/226, 704/233, 704/246, 704/500, 704/E19.006, 704/220, 704/204, 704/227, 704/228, 455/422.1, 455/552.1
• US Class Current: 704/201
• CPC Class Codes: G10L 19/012 Comfort noise or silence coding
• CPC Class Codes: G10L 19/24 Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding

Abstract

An encoding method includes: extracting core layer characteristic parameters and enhancement layer characteristic parameters of a background noise signal, encoding the core layer characteristic parameters and enhancement layer characteristic parameters to obtain a core layer codestream and an enhancement layer codestream. The disclosure also provides an encoding device, a decoding device and method, an encapsulating method, a reconstructing method, an encoding-decoding system and an encoding-decoding method. By describing the background noise signal with the enhancement layer characteristic parameters, the background noise signal can be processed by using more accurate encoding and decoding method, so as to improve the quality of encoding and decoding the background noise signal.

Claims

1. An encoding method, comprising:

extracting core layer characteristic parameters and enhancement layer characteristic parameters of a background noise signal;

encoding the core layer characteristic parameters and enhancement layer characteristic parameters to obtain a core layer codestream and an enhancement layer codestream; and

dividing the background noise signal into a lower band background noise signal and a higher band background noise signal;

wherein extracting the core layer characteristic parameters and enhancement layer characteristic parameters of the background noise signal comprises;

extracting the core layer characteristic parameters of the lower band background noise signal and extracting the higher band enhancement layer characteristic parameters of the higher band background noise signal.

2. An encoding method, comprising:

extracting core layer characteristic parameters and enhancement layer characteristic parameters of a background noise signal;

encoding the core layer characteristic parameters and enhancement layer characteristic parameters to obtain a core layer codestream and an enhancement layer codestream; and

dividing the background noise signal into a lower band background noise signal and a higher band background noise signal;

wherein extracting the core layer characteristic parameters and enhancement layer characteristic parameters of the background noise signal comprises;

extracting the lower band enhancement layer characteristic parameters and core layer characteristic parameters of the lower band background noise signal; and

extracting the higher band enhancement layer characteristic parameters of the higher band background noise signal.

3. A decoding method comprising:

extracting a core layer codestream and an enhancement layer codestream from a Silence Insertion Descriptor (SID) frame;

parsing core layer characteristic parameters from the core layer codestream;

parsing enhancement layer characteristic parameters from the enhancement layer codestream; and

decoding the core layer characteristic parameters and enhancement layer characteristic parameters to obtain a reconstructed core layer background noise signal and a reconstructed enhancement layer background noise signal;

wherein extracting the enhancement layer codestream from the SID frame comprises extracting a lower band enhancement layer codestream from the SID frame; and

parsing the enhancement layer characteristic parameters from the enhancement layer codestream comprises parsing lower band enhancement layer characteristic parameters from the enhancement layer codestream.

4. A non-transitory computer readable media comprising computer readable instructions that when combined with a processor cause the processor to function as an encoding unit configured to perform an encoding process, wherein the encoding unit comprises:

a core layer characteristic parameter encoding unit, configured to extract core layer characteristic parameters from a background noise signal received from a voice activity detector (VAD), and to transmit the core layer characteristic parameters to an encoding unit;

an enhancement layer characteristic parameter encoding unit configured to extract enhancement layer characteristic parameters from the background noise signal and to transmit the enhancement layer characteristic parameters to the encoding unit; and

the encoding unit configured to encode the received core layer characteristic parameters and enhancement layer characteristic parameters to obtain a core layer codestream and an enhancement layer codestream;

wherein the enhancement layer characteristic parameter encoding unit comprises at least one of a lower band enhancement layer characteristic parameter encoding unit and a higher band enhancement layer characteristic parameter encoding unit;

wherein the lower band enhancement layer characteristic parameter encoding unit is configured to extract lower band enhancement layer characteristic parameters from the background noise signal and to transmit the lower band enhancement layer characteristic parameters to the encoding unit;

wherein the higher band enhancement layer characteristic parameter encoding unit is configured to extract higher band enhancement layer characteristic parameters from the background noise signal and to transmit the higher band enhancement layer characteristic parameters to the encoding unit; and

wherein the encoding unit is configured to encode the received lower band enhancement layer characteristic parameters and higher band enhancement layer characteristic parameters to obtain the core layer codestream and enhancement layer codestream.

5. A non-transitory computer readable media comprising computer readable instructions that when combined with a processor cause the processor to function as a decoding unit configured to perform a decoding process, the decoding unit comprising:

a SID frame parsing unit, configured to receive a SID frame of a background noise signal received from a discontinuous transmission (DTX) unit to extract a core layer codestream and an enhancement layer codestream;

to transmit the core layer codestream to a core layer characteristic parameter decoding unit; and

to transmit the enhancement layer codestream to an enhancement layer characteristic parameter decoding unit;

the core layer characteristic parameter decoding unit, configured to extract core layer characteristic parameters from the core layer codestream and to decode the core layer characteristic parameters to obtain a reconstructed core layer background noise signal; and

the enhancement layer characteristic parameter decoding unit configured to extract enhancement layer characteristic parameters from the enhancement layer codestream and to decode the enhancement layer characteristic parameters to obtain a reconstructed enhancement layer background noise signal;

wherein the enhancement layer characteristic parameter decoding unit comprises at least one of a lower band enhancement layer characteristic parameter decoding unit and a higher band enhancement layer characteristic parameter decoding unit;

wherein the lower band enhancement layer characteristic parameter decoding unit is configured to extract lower band enhancement layer characteristic parameters from the enhancement layer codestream, and to decode the lower band enhancement layer characteristic parameters to obtain the reconstructed enhancement layer background noise signal; and

wherein the higher band enhancement layer characteristic parameter decoding unit is configured to extract higher band enhancement layer characteristic parameters from the enhancement layer codestream, and to decode the higher band enhancement layer characteristic parameters to obtain the reconstructed enhancement layer background noise signal.

6. The-non-transitory computer readable media of claim 5, wherein the lower band enhancement layer characteristic parameter decoding unit comprises:

a lower band enhancement layer characteristic parameter parsing unit, configured to extract the lower band enhancement layer characteristic parameters from the received enhancement layer codestream, and to transmit the lower band enhancement layer characteristic parameters to a lower band enhancing unit; and

the lower band enhancing unit, configured to decode the lower band enhancement layer characteristic parameters to obtain a reconstructed enhancement layer background noise signal.

7. The non-transitory computer readable media of claim 5, wherein the higher band enhancement layer characteristic parameter decoding unit comprises:

a higher band enhancement layer characteristic parameter parsing unit, configured to extract the higher band enhancement layer characteristic parameters from the received enhancement layer codestream and to transmit the higher band enhancement layer characteristic parameters to a higher band enhancing unit; and

the higher band enhancing unit, configured to decode the higher band enhancement layer characteristic parameters to obtain a reconstructed enhancement layer background noise signal.

8. An encoding method, comprising:

extracting core layer characteristic parameters and enhancement layer characteristic parameters of a background noise signal;

encoding the core layer characteristic parameters and enhancement layer characteristic parameters to obtain a core layer codestream and an enhancement layer codestream; and

dividing the background noise signal into a lower band background noise signal and a higher band background noise signal;

wherein extracting the core layer characteristic parameters and enhancement layer characteristic parameters of the background noise signal comprises;

extracting the core layer characteristic parameters of the lower band background noise signal and extracting the higher band enhancement layer characteristic parameters of the higher band background noise signal; and

wherein the higher band enhancement layer characteristic parameters comprise at least one of time-domain envelopes and frequency-domain envelopes.

9. The method of claim 8, wherein the time-domain envelopes comprise time-domain envelope mean values, a time domain envelope quantized vector, and frequency-domain envelopes comprises a frequency domain envelope quantized vector;

wherein

the time-domain envelope mean value is calculated through;

10. The method of claim 9, wherein extracting the core layer characteristic parameters and enhancement layer characteristic parameters of the background noise signal comprises:

extracting the core layer characteristic parameters and the lower band enhancement layer characteristic parameters of the background noise signal.

11. The method of claim 10, wherein extracting the lower band enhancement layer characteristic parameters comprises:

computing the lower band enhancement layer characteristic parameters according to the core layer characteristic parameter and the background noise signal.

12. The method of claim 9, further comprising:

encapsulating the obtained core layer codestream and enhancement layer codestream into a Silence Insertion Descriptor (SID) frame.

13. The method of claim 12, wherein encapsulating the core layer codestream and enhancement layer codestream into a SID frame comprises:

forming the SID frame by placing the enhancement layer codestream before or after the core layer codestream.

14. A decoding method, comprising:

extracting a core layer codestream and an enhancement layer codestream from a Silence Insertion Descriptor (SID) frame;

parsing core layer characteristic parameters from the core layer codestream;

parsing enhancement layer characteristic parameters from the enhancement layer codestream; and

decoding the core layer characteristic parameters and enhancement layer characteristic parameters to obtain a reconstructed core layer background noise signal and a reconstructed enhancement layer background noise signal;

wherein the extracting the enhancement layer codestream from the SID frame comprises extracting a higher band enhancement layer codestream from the SID frame;

wherein parsing the enhancement layer characteristic parameters from the enhancement layer codestream comprises paring higher band enhancement layer characteristic parameters from the enhancement layer codestream; and

wherein the higher band enhancement layer characteristic parameters comprise at least one of time-domain envelopes and frequency-domain envelopes.

15. The method of claim 14, wherein the time-domain envelopes comprise time-domain envelope mean values, a time domain envelope quantized vector, and frequency-domain envelopes comprises a frequency domain envelope quantized vector;

the time-domain envelope mean value is calculated at coding end by;

16. The method of claim 15, wherein

extracting the enhancement layer codestream from the SID frame comprises extracting a lower band enhancement layer codestream from the SID frame;

and

parsing the enhancement layer characteristic parameters from the enhancement layer codestream comprises parsing lower band enhancement layer characteristic parameters from the enhancement layer codestream.

17. The method of claim 15, wherein the reconstructed enhancement layer background noise signal comprises reconstructed lower band enhanced layer background noise signal and reconstructed higher band enhancement layer background noise signal;

wherein the reconstructed lower band enhanced layer background noise signal is obtained through;

18. The method of claim 15, further comprising:

combining the reconstructed core layer background noise signal and reconstructed enhancement layer background noise signal to obtain a reconstructed background noise signal.

19. A non-transitory computer readable media comprising computer readable instructions that when combined with a processor cause the processor to function as an encoding-unit configured to perform an encoding process the encoding unit comprising:

a core layer characteristic parameter encoding unit, configured to extract core layer characteristic parameters from a background noise signal received from a voice activity detector (VAD), and to transmit the core layer characteristic parameters to an encoding unit;

an enhancement layer characteristic parameter encoding unit, configured to extract enhancement layer characteristic parameters from the background noise signal, and to transmit the enhancement layer characteristic parameters to the encoding unit; and

the encoding unit, configured to encode the received core layer characteristic parameters and enhancement layer characteristic parameters to obtain a core layer codestream and an enhancement layer codestream;

wherein the enhancement layer characteristic parameter encoding unit comprises at least one of a lower band enhancement layer characteristic parameter encoding unit and a higher band enhancement layer characteristic parameter encoding unit;

wherein the lower band enhancement layer characteristic parameter encoding unit is configured to extract lower band enhancement layer characteristic parameters from the background noise signal and to transmit the lower band enhancement layer characteristic parameters to the encoding unit;

wherein the higher band enhancement layer characteristic parameter encoding unit is configured to extract higher band enhancement layer characteristic parameters from the background noise signal and to transmit the higher band enhancement layer characteristic parameters to the encoding unit, wherein the higher band enhancement layer characteristic parameters comprise at least one of time-domain envelopes and frequency-domain envelopes; and

wherein the encoding unit is configured to encode the received lower band enhancement layer characteristic parameters and higher band enhancement layer characteristic parameters to obtain the core layer codestream and enhancement layer codestream.

20. The non-transitory computer readable media of claim 19, wherein,

the time-domain envelope mean value is calculated by the higher band enhancement layer characteristic parameter encoding unit through:

21. The non-transitory computer readable media of claim 20, wherein the encoding unit further comprises:

a Silence Insertion Descriptor (SID) frame encapsulation unit, configured to encapsulate the core layer codestream and enhancement layer codestream into a SID frame.

22. A non-transitory computer readable media comprising computer readable instructions that when combined with a processor cause the processor to function as a decoding unit configured to perform a decoding process the decoding unit comprising:

a SID frame parsing unit, configured to receive a SID frame of a background noise signal received from a discontinuous transmission (DTX) unit, to extract a core layer codestream and an enhancement layer codestream;

to transmit the core layer codestream to a core layer characteristic parameter decoding unit; and

to transmit the enhancement layer codestream to an enhancement layer characteristic parameter decoding unit;

the core layer characteristic parameter decoding unit, configured to extract core layer characteristic parameters from the core layer codestream and to decode the core layer characteristic parameters to obtain a reconstructed core layer background noise signal; and

the enhancement layer characteristic parameter decoding unit, configured to extract enhancement layer characteristic parameters from the enhancement layer codestream and to decode the enhancement layer characteristic parameters to obtain a reconstructed enhancement layer background noise signal;

wherein the enhancement layer characteristic parameter decoding unit comprises at least one of a lower band enhancement layer characteristic parameter decoding unit and a higher band enhancement layer characteristic parameter decoding unit;

wherein the lower band enhancement layer characteristic parameter decoding unit is configured to extract lower band enhancement layer characteristic parameters from the enhancement layer codestream, and to decode the lower band enhancement layer characteristic parameters to obtain the reconstructed enhancement layer background noise signal;

wherein the higher band enhancement layer characteristic parameter decoding unit is configured to extract higher band enhancement layer characteristic parameters from the enhancement layer codestream, and to decode the higher band enhancement layer characteristic parameters to obtain the reconstructed enhancement layer background noise signal; and

wherein the higher band enhancement layer characteristic parameters comprise at least one of time-domain envelopes and frequency-domain envelopes.

23. The non-transitory computer readable media of claim 22, wherein the time-domain envelopes comprise time-domain envelope mean values, a time domain envelope quantized vector, and frequency-domain envelopes comprises a frequency domain envelope quantized vector;

the time-domain envelope mean value is calculated at coding end by;

24. The non-transitory computer readable media of claim 23, wherein the lower band enhancement layer characteristic parameter decoding unit comprises:

a lower band enhancement layer characteristic parameter parsing unit, configured to extract the lower band enhancement layer characteristic parameters from the received enhancement layer codestream, and to transmit the lower band enhancement layer characteristic parameters to a lower band enhancing unit; and

the lower band enhancing unit, configured to decode the lower band enhancement layer characteristic parameters to obtain a reconstructed enhancement layer background noise signal.

25. The non-transitory computer readable media of claim 23, wherein the reconstructed enhancement layer background noise signal comprises reconstructed lower band enhanced layer background noise signal and reconstructed higher band enhancement layer background noise signal;

wherein the reconstructed lower band enhanced layer background noise signal is obtained through;