# US 2018/0322885 A1 · Encoding device and method, decoding device and method, and program

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- Number: US 2018/0322885 A1
- Document ID: US20180322885A1
- Status: Published application
- Kind: A1
- Application number: 16/037,574
- Filed: 2018-07-17
- Published: 2018-11-08
- Earliest claimed: 2014-08-06
- Assignees: Sony Corporation
- Applicants: Sony Corporation
- Inventors: Shuichiro Nishigori; Shiro Suzuki
- Web page: https://patentgrep.com/patent/US20180322885A1

## CPC

- G10L 19/0204: {using subband decomposition}
- G10L 19/02: using spectral analysis, e.g. transform vocoders or subband vocoders
- G10L 19/0212: {using orthogonal transformation}
- G10L 21/038: using band spreading techniques
- G10L 21/0388: Details of processing therefor
- H03M 7/30: Compression (speech analysis-synthesis for redundancy reduction G10L19/00; for image communication H04N); Expansion; Suppression of unnecessary data, e.g. redundancy reduction
- G10L 19/22: Mode decision, i.e. based on audio signal content versus external parameters
- G10L 19/24: Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
- G10L: SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)

## Abstract

The present technology relates to an encoding device and a method, a decoding device and a method, and a program that enables acquisitions of high-quality sound even in a resource-poor setting. A demultiplexer demultiplexes a supplied code string, to obtain the quantized low-band spectrum, the spectral characteristic code, and the quantized expansion coefficient(s). At this point, the code string includes a single quantized expansion coefficient or quantized expansion coefficients of the respective bands in the high band depending on the spectral characteristic code. A spectral inverse quantization unit obtains the low-band spectrum by inversely quantizing the quantized low-band spectrum. An expansion coefficient inverse quantization unit obtains the expansion coefficient(s) by inversely quantizing the quantized expansion coefficient(s). An expanded spectrum generation unit generates an expanded spectrum, in accordance with the low-band spectrum and the expansion coefficient(s) depending on the spectral characteristic code. An IMDCT unit generates a band-expanded time-series signal from the low-band spectrum and the expanded spectrum. The present technology can be applied to decoding devices.

## Claims

### Claim 1

A decoding device comprising:
an acquisition unit configured to acquire a low-band spectrum, and a single expansion coefficient of an expanded band or a plurality of expansion coefficients of respective bands constituting the expanded band, the expanded band being different from a low band, the single expansion coefficient or the plurality of expansion coefficients being for obtaining an expanded spectrum of the expanded band;
a generation unit configured to generate the expanded spectrum by adjusting a level of a seed spectrum or a random noise in accordance with the expansion coefficients or envelope coefficients corresponding to spectral characteristics; and
a combining unit configured to combine the low-band spectrum and the expanded spectrum.

### Claim 2 (depends on 1)

The decoding device according to claim 1, wherein a value of the low-band spectrum is determined by an amplitude component and a phase component of an original time-series signal.

### Claim 3 (depends on 2)

The decoding device according to claim 2, wherein the low-band spectrum is an MDCT spectrum.

### Claim 4

A decoding method comprising:
acquiring a low-band spectrum, and a single expansion coefficient of an expanded band or a plurality of expansion coefficients of respective bands constituting the expanded band, the expanded band being different from a low band, the single expansion coefficient or the plurality of expansion coefficients being for obtaining an expanded spectrum of the expanded band;
generating the expanded spectrum by adjusting a level of a seed spectrum or a random noise in accordance with the expansion coefficients or envelope coefficients corresponding to spectral characteristics; and
combining the low-band spectrum and the expanded spectrum.

### Claim 5 (depends on 4)

The decoding method according to claim 4, wherein a value of the low-band spectrum is determined by an amplitude component and a phase component of an original time-series signal.

### Claim 6 (depends on 5)

The decoding method according to claim 5, wherein the low-band spectrum is an MDCT spectrum.

### Claim 7

A non-transitory computer-readable medium containing computer-executable instructions that, when executed by a processing device, perform a process,
the process comprising:
acquiring a low-band spectrum, and a single expansion coefficient of an expanded band or a plurality of expansion coefficients of respective bands constituting the expanded band, the expanded band being different from a low band, the single expansion coefficient or the plurality of expansion coefficients being for obtaining an expanded spectrum of the expanded band;
generating the expanded spectrum by adjusting a level of a seed spectrum or a random noise in accordance with the expansion coefficients or envelope coefficients corresponding to spectral characteristics; and
combining the low-band spectrum and the expanded spectrum.