Apparatus and method for encoding and decoding of integrated speech and audio utilizing a band expander to output the audio or speech to a frequency domain encoder or an LPC encoder

摘要

Provided are an apparatus and a method for integrally encoding and decoding a speech signal and a audio signal. The encoding apparatus may include: an input signal analyzer to analyze a characteristic of an input signal; a first conversion encoder to convert the input signal to a frequency domain signal, and to encode the input signal when the input signal is a audio characteristic signal; a Linear Predictive Coding (LPC) encoder to perform LPC encoding of the input signal when the input signal is a speech characteristic signal; a frequency band expander for expanding a frequency band of the input signal whose output is transmitted to either the first conversion encoder or the LPC encoder based on the input characteristic; and a bitstream generator to generate a bitstream using an output signal of the first conversion encoder and an output signal of the LPC encoder.

主权项

1. An encoding apparatus for integrally encoding a speech signal and an audio signal, the encoding apparatus comprising:
an input signal analyzer to analyze a characteristic of an input signal; a frequency band expander to expand frequency band of the input signal; a first conversion encoder to convert the input signal to a frequency domain, and to encode core band of the converted input signal if the analyzed input signal is an audio characteristic signal; a Linear Predictive Coding (LPC) encoder to encode core band of the input signal based on LPC if the analyzed input signal is a speech characteristic signal; and a bitstream generator to generate a bitstream using an output signal of the first conversion encoder and an output signal of the LPC encoder, wherein the core band includes band which is not expanded in the frequency band of the input signal, wherein an output of the frequency band expander is transmitted to either the first conversion encoder or the LPC encoder, according to the characteristic of the input signal.