# US 9,437,197 B2 · Encoding device, encoding method, and program

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- Number: US 9,437,197 B2
- Document ID: US9437197B2
- Status: Granted
- Kind: B2
- Application number: 14/006,148
- Filed: 2012-03-23
- Published: 2014-01-02
- Granted: 2016-09-06
- Earliest claimed: 2011-03-31
- Assignees: Sony Corporation
- Applicants: Hiroyuki Honma; Toru Chinen; Yuki Yamamoto; Mitsuyuki Hatanaka
- Inventors: Hiroyuki Honma; Toru Chinen; Yuki Yamamoto; Mitsuyuki Hatanaka
- Web page: https://patentgrep.com/patent/US9437197B2

## CPC

- G10L 19/008: Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
- G10L 19/002: Dynamic bit allocation (for perceptual audio coders G10L19/032)
- G10L 19/24: Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
- G10L 19/0204: {using subband decomposition}
- G10L: SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING

## Abstract

This technology relates to an encoding device, an encoding method, and a program capable of improving audio quality and more efficiently encoding audio. A first high-frequency encoding circuit encodes a high-frequency range based on a low-frequency subband signal and a high-frequency subband signal and obtains a high-frequency code amount. A low-frequency encoding circuit encodes a low-frequency signal with a code amount determined by the high-frequency code amount and a low-frequency decoding circuit decodes the encoded low-frequency signal. A subband dividing circuit divides a decoded low-frequency signal obtained by decoding into decoded low-frequency subband signals of a plurality of subbands and a second high-frequency encoding circuit generates a high-frequency code string such that a code amount of the high-frequency code string for obtaining a high-frequency component is not larger than the high-frequency code amount based on the decoded low-frequency subband signals and the high-frequency subband signals. The present invention is applicable to the encoding device.

## Claims

### Claim 1

An encoding device, comprising:
a first high-frequency encoding circuit which calculates a high-frequency code amount being a code amount of a high-frequency code string for obtaining a high-frequency component based on a low-frequency component and the high-frequency component of an input signal;
a low-frequency encoding circuit which encodes the low-frequency component of the input signal based on the high-frequency code amount calculated by the first high-frequency encoding circuit to generate a low-frequency code string;
a low-frequency decoding circuit which decodes the low-frequency code string;
a second high-frequency encoding circuit which generates the high-frequency code string based on a decoded low-frequency component obtained by decoding the low-frequency code string and the high-frequency component such that the code amount of the high-frequency code string is not larger than the high-frequency code amount;
a multiplexing circuit which multiplexes the low-frequency code string and the high-frequency code string to generate an output code string; and
a delay circuit which delays the high-frequency code amount, the decoded low-frequency component, and the high-frequency component input to the second high-frequency encoding circuit.

### Claim 2 (depends on 1)

The encoding device according to claim 1, wherein
the first high-frequency encoding circuit calculates the high-frequency code amount based on low-frequency subband signals of a plurality of subbands composing the low-frequency component and high-frequency subband signals of a plurality of subbands composing the high-frequency component, and
the second high-frequency encoding circuit generates the high-frequency code string based on decoded low-frequency subband signals of a plurality of subbands composing the decoded low-frequency component and the high-frequency subband signals.

### Claim 3 (depends on 1)

The encoding device according to claim 1, further comprising:
a code amount adjusting circuit which, when the code amount of the high-frequency code string obtained by the second high-frequency encoding circuit is smaller than the high-frequency code amount, makes a difference between the code amount of the high-frequency code string and the high-frequency code amount a surplus code amount capable of being used in next and subsequent processes and controls storage of the surplus code amount.

### Claim 4 (depends on 3)

The encoding device according to claim 3, wherein
the surplus code amount is used for adjusting the code amount of at least any of the high-frequency code string and the low-frequency code string.

### Claim 5

An encoding method comprising:
calculating a high-frequency code amount being a code amount of a high-frequency code string for obtaining a high-frequency component based on a low-frequency component and the high-frequency component of an input signal;
encoding the low-frequency component of the input signal based on the high-frequency code amount to generate a low-frequency code string;
decoding the low-frequency code string;
delaying the high-frequency code amount, a decoded low-frequency component obtained by decoding the low-frequency code string and the high-string is not larger than the high-frequency code amount, and the high-frequency component;
generating the high-frequency code string based on the decoded low-frequency component and
multiplexing the low-frequency code string and the high-frequency code string to generate an output code string.

### Claim 6

A non-transitory computer readable storage device encoded with instructions that, when executed by at least one processor, cause the at least one processor to perform a method comprising acts of:
calculating a high-frequency code amount being a code amount of a high-frequency code string for obtaining a high-frequency component based on a low-frequency component and the high-frequency component of an input signal;
encoding the low-frequency component of the input signal based on the high-frequency code amount to generate a low-frequency code string;
decoding the low-frequency code string;
delaying the high-frequency code amount, a decoded low-frequency component obtained by decoding the low-frequency code string and the high-frequency component such that the code amount of the high-frequency code string is not larger than the high-frequency code amount and the high-frequency component;
generating the high-frequency code string based on the decoded low-frequency component; and
multiplexing the low-frequency code string and the high-frequency code string to generate an output code string.