TRANSCODING METHOD AND APPARATUS

• US 20090037180A1
• Filed: 11/29/2007
• Published: 02/05/2009
• Est. Priority Date: 08/02/2007
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Mi-young, Choo, Ki-hyun, Oh, Eun-mi, Kim, Jung-hoe
• Application Number:
  US11/947,016
• Publication Number:
  US 20090037180A1
• Time in Patent Office: Days
• US Class Current: 704/500
• CPC Class Codes: G10L 19/0204 using subband decomposition
• CPC Class Codes: G10L 19/173 Transcoding, i.e. converting between two coded representations avoiding cascaded coding-decoding

Abstract

Provided is a method and apparatus for encoding a bitstream, which was encoded by a predetermined method, in another method. By adaptively encoding a bitstream encoded by a predetermined method by selecting a domain in which the encoding is performed for each predetermined band, the bitstream can be efficiently encoded and transmitted and received, and compatibility can be provided.

Claims

1. A transcoding method comprising:

decoding a bitstream encoded by a predetermined method;

dividing the decoded result into predetermined bands and selecting a domain for encoding the decoded result for each band according to a pre-set criterion; and

encoding the decoded result in the selected domain.

2. The transcoding method of claim 1, wherein the selecting comprises selecting one of a time domain and a frequency domain.

3. The transcoding method of claim 1, further comprising extracting information pre-set in the decoding,

wherein the selecting comprises selecting a domain for encoding the decoded result for each band using the extract information.

4. The transcoding method of claim 1, further comprising receiving setting(s) to be applied to the encoding from a user,

wherein the encoding comprises encoding the decoded result according to the received setting(s).

5. The transcoding method of claim 1, wherein the decoding comprises:

determining a method by which the bitstream was encoded; and

decoding the bitstream according to the determined method.

6. The transcoding method of claim 1, further comprising extracting, in the decoding, pre-set parameter(s) to be used in the encoding,

wherein the encoding comprises encoding the decoded result in the selected domain using the extracted parameter(s).

7. The transcoding method of claim 1, wherein the encoding comprises:

selecting frequency component(s) according to a pre-set criterion in spectrum(-ra) of band(s) selected to be encoded in the frequency domain in the selecting; and

encoding the selected frequency component(s).

8. The transcoding method of claim 7, further comprising encoding a residual spectrum excluding the selected frequency component(s) selected from among the spectrum(-ra).

9. The transcoding method of claim 8, wherein the encoding of the residual spectrum comprises calculating and encoding energy value(s) of the residual spectrum of each band.

10. A transcoding apparatus comprising:

a decoder decoding a bitstream encoded by a predetermined method;

a domain selector dividing the decoded result into predetermined bands and selecting a domain for encoding the decoded result for each band according to a pre-set criterion; and

an encoder encoding the decoded result in the selected domain.

11. The transcoding apparatus of claim 10, wherein the domain selector selects one of a time domain and a frequency domain.

12. The transcoding apparatus of claim 10, further comprising an information extractor extracting information pre-set by the decoder,

wherein the domain selector selects a domain for encoding the decoded result for each band using the extract information.

13. The transcoding apparatus of claim 10, further comprising a settings input unit receiving setting(s), which are to be applied to the encoding performed by the encoder, from a user,

wherein the encoder encodes the decoded result according to the received setting(s).

14. The transcoding apparatus of claim 10, wherein the decoder comprises:

a method determiner determining a method in which the bitstream was encoded; and

a bitstream decoder decoding the bitstream according to the determined method.

15. The transcoding apparatus of claim 10, further comprising a parameter extractor extracting, in a decoding process of the decoder, pre-set parameter(s) to be used in the encoder,

wherein the encoder encodes the decoded result in the selected domain using the extracted parameter(s).

16. The transcoding apparatus of claim 10, wherein the encoder comprises:

a frequency component selector selecting frequency component(s) according to a pre-set criterion in spectrum(-ra) of band(s) selected to be encoded in the frequency domain by the domain selector; and

a frequency component encoder encoding the selected frequency component(s).

17. The transcoding apparatus of claim 16, further comprising a residual spectrum encoder encoding a residual spectrum excluding the selected frequency component(s) from among the spectrum(-ra).

18. The transcoding apparatus of claim 17, wherein the residual spectrum encoder calculates and encodes energy value(s) of the residual spectrum of each band.

19. A transcoding method comprising:

decoding a bitstream encoded by a predetermined method;

selecting frequency component(s) according to a pre-set criterion from the decoded result; and

encoding the selected frequency component(s).

20. The transcoding method of claim 19, further comprising encoding a residual spectrum excluding the selected frequency component(s) from the decoded result.

21. The transcoding method of claim 20, wherein the encoding of the residual spectrum comprises calculating and encoding energy value(s) of the residual spectrum of each band.

22. The transcoding method of claim 19, further comprising receiving setting(s) to be applied to the encoding from a user,

wherein the encoding comprises encoding the selected frequency component(s) according to the received setting(s).

23. The transcoding method of claim 19, wherein the decoding comprises:

determining a method in which the bitstream was encoded; and

decoding the bitstream according to the determined method.

24. The transcoding method of claim 19, further comprising extracting, in the decoding, pre-set parameter(s) to be used in the encoding,

wherein the encoding comprises encoding the selected frequency component(s) using the extracted parameter(s).