APPARATUS AND METHOD FOR ENCODING AND DECODING OF INTEGRATED SPEECH AND AUDIO

• US 20110112829A1
• Filed: 07/14/2009
• Published: 05/12/2011
• Est. Priority Date: 07/14/2008
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute, Kwangwoon University Industry
• Original Assignee: Electronics and Telecommunications Research Institute, Kwangwoon University Industry
• Inventors: Park, Young-cheol, Kang, Kyeongok, Baek, Seung-Kwon, Hong, Jin-Woo, Lee, Tae Jin, Seo, Jeongil, Kim, Min Je, Jang, Dae Young, Park, Hochong
• Granted Patent: US 8,990,072 B2
• Time in Patent Office: Days
• US Class Current: 704/205
• 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 19/02 using spectral analysis, e.g. transform vocoders or subband vocoders
• CPC Class Codes: G10L 19/12 the excitation function being a code excitation, e.g. in code excited linear prediction [CELP] vocoders
• CPC Class Codes: G10L 19/20 using sound class specific coding, hybrid encoders or object based coding
• CPC Class Codes: G10L 19/22 Mode decision, i.e. based on audio signal content versus external parameters
• CPC Class Codes: G11C 2207/16 Solid state audio deprecated, only for historical reasons, G06F3/16, G11B

Abstract

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; 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.

Claims

1. An encoding apparatus for integrally encoding a speech signal and a audio signal, the encoding apparatus comprising:

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; 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.

2. The encoding apparatus of claim 1, further comprising:

a stereo encoder to down-mix the input signal to a mono signal, and to extract stereo sound image information.

3. The encoding apparatus of claim 2, wherein the stereo encoder controls a parameter value for stereo encoding according to the characteristic of the input signal.

4. The encoding apparatus of claim 1, further comprising:

a frequency band expander to expand the input signal to a high frequency band signal.

5. The encoding apparatus of claim 4, wherein the frequency band expander selectively applies at least one Spectral Band Replication (SBR) standard according to the characteristic of the input signal.

6. The encoding apparatus of claim 1, further comprising:

a psychological acoustic unit to control the first conversion encoder using an acoustic characteristic of a human being.

7. The encoding apparatus of claim 1, wherein the LPC encoder comprises:

a time domain encoder to perform time-domain encoding of the input signal when the input signal is the speech characteristic signal; and

a second conversion encoder to perform fast Fourier transform (FFT) encoding of the input signal when the input signal is the audio characteristic signal.

8. The encoding apparatus of claim 1, wherein the input signal analyzer classifies the input signal into any one of the audio characteristic signal, the speech characteristic signal, and a low energy signal.

9. The encoding apparatus of claim 8, wherein:

the speech characteristic signal is classified into any one of a steady-harmonic state, a low steady-harmonic state, and a steady-noise state, and

the audio characteristic signal is classified into any one of a complex-harmonic state and a complex-noisy state. 15

10. An encoding apparatus for integrally encoding a speech signal and a audio signal, the encoding apparatus comprising:

an input signal analyzer to analyze a characteristic of an input signal;

a stereo encoder to down-mix the input signal to a mono signal, and to extract stereo sound image information;

a frequency band expander to generate information for expanding the input signal to a high frequency band signal;

a first conversion encoder to convert the high frequency band signal to a frequency band, and to encode the high frequency band signal when the input signal is a audio characteristic signal;

an LPC encoder to perform LPC encoding of the high frequency band signal when the input signal is a speech characteristic signal; and

a bitstream generator to generate a bitstream using the stereo sound image information, information for expanding the input signal to the high frequency band signal, an output signal of the first conversion encoder, and an output signal of the LPC encoder.

11. The encoding apparatus of claim 10, further comprising:

a psychological acoustic unit to control the first conversion encoder using an acoustic characteristic of a human being.

12. The encoding apparatus of claim 10, wherein the stereo encoder controls a parameter value for stereo encoding according to the characteristic of the input signal.

13. The encoding apparatus of claim 10, wherein the frequency band expander selectively applies at least one SBR standard according to the characteristic of the input signal.

14. The encoding apparatus of claim 10, wherein the LPC encoder comprises:

a time domain encoder to perform time-domain encoding of the input signal when the input signal is the speech characteristic signal; and

a second conversion encoder to perform FFT encoding of the encoding signal when the input signal is the audio characteristic signal.

15. A decoding apparatus for integrally encoding a speech signal and a audio signal, the decoding apparatus comprising:

a bitstream analyzer to analyze an input bitstream signal;

a conversion decoder to convert the bitstream signal to a frequency domain signal, and to decode the bitstream signal when the bitstream signal is a audio bitstream signal;

an LPC decoder to perform LPC decoding of the bitstream signal when the bitstream signal is a speech bitstream signal;

a frequency band synthesizer to synthesize a frequency band of the bitstream signal; and

a stereo decoder to decode the bitstream signal to a stereo signal.