LPC RESIDUAL SIGNAL ENCODING/DECODING APPARATUS OF MODIFIED DISCRETE COSINE TRANSFORM (MDCT)-BASED UNIFIED VOICE/AUDIO ENCODING DEVICE

• US 20150081286A1
• Filed: 11/14/2014
• Published: 03/19/2015
• Est. Priority Date: 10/13/2008
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: BEACK, Seung Kwon, LEE, Tae Jin, KIM, Min Je, KANG, Kyeongok, JANG, Dae Young, HONG, Jin Woo, SEO, Jeongil, AHN, Chieteuk, PARK, Hochong, PARK, Young-cheol
• Granted Patent: US 9,378,749 B2
• Time in Patent Office: Days
• US Class Current: 704/219
• CPC Class Codes: G10L 19/087 using mixed excitation models, e.g. MELP, MBE, split band LPC or HVXC
• CPC Class Codes: G10L 19/125 Pitch excitation, e.g. pitch synchronous innovation CELP [PSI-CELP]
• CPC Class Codes: G10L 19/22 Mode decision, i.e. based on audio signal content versus external parameters
• CPC Class Codes: G10L 19/26 Pre-filtering or post-filtering

Abstract

Disclosed is an LPC residual signal encoding/decoding apparatus of an MDCT based unified voice and audio encoding device. The LPC residual signal encoding apparatus analyzes a property of an input signal, selects an encoding method of an LPC filtered signal, and encode the LPC residual signal based on one of a real filterbank, a complex filterbank, and an algebraic code excited linear prediction (ACELP).

Claims

1. A processing method, comprising:

identify a first block included in a previous frame;

identify a second block included in a current frame;

identifying an intentional signal related to the first block; and

overlap-adding the first block and second block using a window applied to the intentional signal,

wherein the first block has a speech characteristic and the second block has audio characteristic.

2. The processing method of claim 1, wherein the first block is processed based on ACELP (Algebraic code-excited linear prediction) and the second block is processed based on MDCT (Modified Discrete Cosine Transform).

3. The processing method of claim 1, wherein the first block and the second block have a 128 overlap size.

4. The processing method of claim 1, wherein the overlap-adding comprising:

first overlap-adding the first block applied to first window into the intentional signal applied to second window; and

second overlap-adding the second block applied to third window into the first overlapped result applied to first window.

5. A processing method, comprising:

identify a first block included in a previous frame;

identify a second block included in a current frame; and

identifying additional information related to the first block; and

processing the first block and second block using the additional information,

wherein the first block has a speech characteristic and the second block has audio characteristic.

6. The processing method of claim 5, wherein the first block is processed based on ACELP (Algebraic code-excited linear prediction) and the second block is processed based on MDCT (Modified Discrete Cosine Transform).

7. The processing method of claim 5, wherein the first block and the second block have a 128 overlap size.

8. The processing method of claim 5, wherein the processing comprising:

overlap-adding the first block applied the the additional information into the second block.