LPC residual signal encoding/decoding apparatus of modified discrete cosine transform (MDCT)-based unified voice/audio encoding device
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).
1. A processing method for processing a signal performed in a device, 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 an audio characteristic, and
wherein the overlap-adding comprises overlap-adding the first block applied to a first window into the intentional signal applied to a second window.
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 further comprises:
overlap-adding the second block applied to a third window into the first overlapped result applied to first window.
5. A processing method for processing a signal performed in a device, 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 an audio characteristic, and
wherein the processing comprises overlap-adding the first block applied to the additional information into the second block.
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.