INTEGRATED VOICE/AUDIO ENCODING/DECODING DEVICE AND METHOD WHEREBY THE OVERLAP REGION OF A WINDOW IS ADJUSTED BASED ON THE TRANSITION INTERVAL

• US 20120209600A1
• Filed: 10/11/2010
• Published: 08/16/2012
• Est. Priority Date: 10/14/2009
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute, Kwangwoon University Industry
• Inventors: Kim, Min Je, Beack, Seung Kwon, Lee, Tae Jin, Kang, Kyeong Ok, Seo, Jeongil, Kim, Jin Woong, Hong, Jin Woo, Park, Young Cheol, Park, Ho Chong
• Application Number:
  US13/502,025
• Publication Number:
  US 20120209600A1
• Time in Patent Office: Days
• US Class Current: 704/219
• CPC Class Codes: G10L 19/008 Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
• CPC Class Codes: G10L 19/025 Detection of transients or attacks for time/frequency resolution switching
• CPC Class Codes: G10L 19/20 using sound class specific coding, hybrid encoders or object based coding
• CPC Class Codes: G10L 21/038 using band spreading techniques

Abstract

A Unified Speech and Audio Codec (USAC) for adjusting an overlap area of a window based on a transition is provided. To increase an encoding efficiency, encoding may be performed by overlapping relatively long windows. Additionally, when a transition is generated between frames, an overlap area of a window may be reduced based on the transition, thereby preventing a noise from occurring due to the transition.

Claims

1. A Unified Speech and Audio Codec (USAC), comprising:

a transition detector to detect a first transition from an input signal;

a first encoder to encode the input signal and to detect a second transition from a result of the encoding;

a transition determination unit to compare the first transition and the second transition and to determine a final transition;

a second encoder to core-encode the input signal by adjusting a length of an overlap area of a window based on the determined transition; and

a bitstream formatter to generate a bitstream comprising the core-encoded input signal and the final transition.

2. The USAC of claim 1, wherein the first encoder performs either a Spectral Bandwidth Extension (SBE) encoding scheme or a Parametric Stereo (PS) encoding scheme.

3. The USAC of claim 1, wherein the transition detector detects a transition in a location adjacent to a boundary of a super frame comprising at least one sub-frame among a plurality of sub-frames in the input signal.

4. The USAC of claim 1, wherein the second encoder core-encodes the input signal by applying a window having an overlap area of which a length is reduced by a transition based on a folding point.

5. The USAC of claim 4, wherein the second encoder core-encodes the input signal by applying, to a current sub-frame to be encoded, a window that is transformed based on a Linear Prediction Domain (LPD) mode of a previous sub-frame and an LPD mode of a next sub-frame.

6. A Unified Speech and Audio Codec (USAC), comprising:

a first encoder to encode an input signal and to detect a transition from a result of the encoding;

a second encoder to core-encode the input signal by adjusting a length of an overlap area of a window based on the detected transition; and

a bitstream formatter to generate a bitstream comprising the core-encoded input signal.

7. The USAC of claim 6, wherein the first encoder performs either a Spectral Bandwidth Extension (SBE) encoding scheme or a Parametric Stereo (PS) encoding scheme.

8. The USAC of claim 6, wherein the second encoder core-encodes the input signal by applying a window having an overlap area of which a length is reduced by a transition based on a folding point.

9. The USAC of claim 8, wherein the second encoder core-encodes the input signal by applying, to a current sub-frame to be encoded, a window that is changed based on a Linear Prediction Domain (LPD) mode of a previous sub-frame and an LPD mode of a next sub-frame.

10. A Unified Speech and Audio Codec (USAC), comprising:

a bitstream parser to parse a bitstream and to extract a transition; and

a decoder to core-decode an input signal by adjusting a length of an overlap area of a window based on the transition.

11. The USAC of claim 10, wherein the decoder core-decodes the input signal by applying a window having an overlap area of which a length is reduced by a transition based on a folding point.

12. The USAC of claim 11, wherein the decoder core-decodes the input signal by applying, to a current sub-frame to be decoded, a window that is changed based on a Linear Prediction Domain (LPD) mode of a previous sub-frame and an LPD mode of a next sub-frame.

13. The USAC of claim 11, wherein the transition is either a transition extracted from an input signal, or a transition extracted from a result of encoding an input signal.

14. A Unified Speech and Audio Codec (USAC), comprising:

a bitstream parser to parse an input signal from a bitstream;

a first decoder to decode the input signal and to detect a transition from a result of the decoding; and

a second decoder to core-decode the input signal by adjusting a length of an overlap area of a window based on the detected transition.

15. The USAC of claim 14, wherein the first decoder performs either a Spectral Bandwidth Extension (SBE) decoding scheme or a Parametric Stereo (PS) decoding scheme, and

wherein the second decoder core-decodes the input signal by applying a window having an overlap area of which a length is reduced by a transition based on a folding point.

16. The USAC of claim 15, wherein the second decoder core-decodes the input signal by applying, to a current sub-frame to be decoded, a window that is changed based on a Linear Prediction Domain (LPD) mode of a previous sub-frame and an LPD mode of a next sub-frame.

17. A method performed by a Unified Speech and Audio Codec (USAC), the method comprising:

detecting a first transition from an input signal;

encoding the input signal and detecting a second transition from a result of the encoding;

comparing the first transition and the second transition and determining a final transition;

core-encoding the input signal by adjusting a length of an overlap area of a window based on the determined transition; and

generating a bitstream comprising the core-encoded input signal and the final transition.

18. A method performed by a Unified Speech and Audio Codec (USAC), the method comprising:

encoding an input signal and detecting a transition from a result of the encoding;

core-encoding the input signal by adjusting a length of an overlap area of a window based on the detected transition; and

generating a bitstream comprising the core-encoded input signal.

19. A method performed by a Unified Speech and Audio Codec (USAC), the method comprising:

parsing a bitstream and extracting a transition; and

core-decoding an input signal by adjusting a length of an overlap area of a window based on the transition.

20. A method performed by a Unified Speech and Audio Codec (USAC), the method comprising:

parsing an input signal from a bitstream;

decoding the input signal and detecting a transition from a result of the decoding; and

core-decoding the input signal by adjusting a length of an overlap area of a window based on the detected transition.