US9355646B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9355646-B2 |
| Application number | US-201314020006-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 6, 2013 |
| Priority date | Jul 14, 2008 |
| Publication date | May 31, 2016 |
| Grant date | May 31, 2016 |
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A method and apparatus to encode and decode an audio/speech signal is provided. An inputted audio signal or speech signal may be transformed into at least one of a high frequency resolution signal and a high temporal resolution signal. The signal may be encoded by determining an appropriate resolution, the encoded signal may be decoded, and thus the audio signal, the speech signal, and a mixed signal of the audio signal and the speech signal may be processed.
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What is claimed is: 1. An apparatus for decoding an audio or speech signal, the apparatus comprising: a determination unit configured to receive a signal in a bitstream as an input and determine whether the signal is encoded in a frequency domain or a time domain based on encoding information included in the bitstream; a frequency domain decoding unit configured to loss-less decode and dequantize the signal when it is determined that the signal is encoded in the frequency domain; a temporal noise shaping unit configured to perform a temporal noise shaping on the dequantized signal; an inverse transform unit configured to inverse-transform the temporal noise shaped signal to a time domain signal; a time domain decoding unit configured to reconstruct the signal by using a linear prediction based decoding when it is determined that the signal is encoded in the time domain; and a high frequency generating unit configured to generate a high band signal using either the inverse-transformed signal or the reconstructed signal and output the high band signal. 2. The apparatus of claim 1 further comprising: a stereo processing unit to generate a stereo signal from the high band signal and either the inverse-transformed signal or the reconstructed signal. 3. The apparatus of claim 1 , wherein the time domain decoding unit is configured to reconstruct the signal encoded in the time domain by using at least a long-term predictor.
using sound class specific coding, hybrid encoders or object based coding · CPC title
using predictive techniques · CPC title
using subband decomposition · CPC title
Spectral prediction for preventing pre-echo; Temporary noise shaping [TNS], e.g. in MPEG2 or MPEG4 · CPC title
Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis (in musical instruments G10H) · CPC title
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