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

• US 20150154974A1
• Filed: 01/26/2015
• Published: 06/04/2015
• 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: Lee, Tae Jin, Baek, Seung Kwon, Kim, Min Je, Jang, Dae Young, Seo, Jeongil, Kang, Kyeongok, Hong, Jin Woo, Park, Hochong, Park, Young Cheol
• Granted Patent: US 9,711,159 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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. A method for integrally encoding a speech signal and an audio signal, executed by a computer, the method comprising:

analyzing a characteristic of an input signal whether the input signal is an audio characteristic signal or a speech characteristic signal;

expanding frequency band of the input signal;

encoding the input signal having expanded frequency band

generating a bitstream using an encoding result of the input signal,

wherein the encoding performs by switching the below encoding module according to characteristic of the input signal,

(i) encoding a core band of the input signal based on a time-domain encoding module, when the input signal is the speech characteristic signal, or

(ii) encoding a core band of the input signal based on a transform encoding module, when the input signal is the audio characteristic signal,

wherein the core band includes band which is not expanded in the a frequency band of the input signal.

2. The method of claim 1, wherein the expanding comprising:

expanding a frequency band based on Spectral Band Replication (SBR).

3. The method of claim 1, wherein the time-domain encoding module encodes the core band of the input signal based on Linear Predictive Coding (LPC) scheme.

4. The method of claim 1, wherein the transform encoding module encodes the core band of the input signal based on a Modified Discrete Cosine Transform (MDCT) scheme.

5. A decoding method for integrally decoding a speech signal and an audio signal, executed by a computer, the method comprising:

determining a characteristic of a encoded input signal including in a bitstream whether an encoded input signal is an audio characteristic signal or a speech characteristic signal

decoding the encoded input signal based on the characteristic of the encoded input signal,

wherein the encoding performs by switching the below decoding module according to characteristic of the input signal,

(i) decoding a core band of the input signal based on a time-domain decoding module, when the encoded input signal is the speech characteristic signal, or

(ii) decoding a core band of the input signal based on a transform decoding module, when the encoded input signal is the audio characteristic signal,

wherein the core band includes band which is not expanded in the a frequency band of the encoded input signal.

6. The method of claim 5, wherein the time-domain decoding module decodes the core band of the input signal based on Linear Predictive Coding (LPC) scheme.

7. The method of claim 5, wherein the transform decoding module decodes the core band of the input signal based on a Modified Discrete Cosine Transform (MDCT) scheme.

8. A decoding apparatus for integrally decoding a speech signal and an audio signal, executed by a computer, the apparatus comprising a processor:

wherein the processor configured to;

determine a characteristic of a encoded input signal including in a bitstream whether an encoded input signal is an audio characteristic signal or a speech characteristic signal

decode the encoded input signal based on the characteristic of the encoded input signal,

wherein the encoding performs by switching the below decoding module according to characteristic of the input signal,

(i) decode a core band of the input signal based on a time-domain decoding module, when the encoded input signal is the speech characteristic signal, or

(ii) decode a core band of the input signal based on a transform decoding module, when the encoded input signal is the audio characteristic signal,

wherein the core band includes band which is not expanded in the a frequency band of the encoded input signal.