DIGITAL INFORMATION STEALTH METHOD USING AUDIBLE FREQUENCY BAND AUDIO SIGNAL

• Main Authors: CHUNG, Chee Whan, KIM, Jae Young, KIL, Hyun Bae
• Format: Patent
• Language: English; French; Korean
• Published: 03.08.2017
• Subjects: CALCULATING; COMPUTING; COUNTING; DATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FORADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORYOR FORECASTING PURPOSES; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PHYSICS; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE,COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTINGPURPOSES, NOT OTHERWISE PROVIDED FOR; WIRELESS COMMUNICATIONS NETWORKS

A digital information stealth method using an audible frequency band audio signal, according to the present invention, is a digital information stealth method equipped with an encoding device including an encoder, a divider, a coupler, a first codec, and a second codec, comprising the steps of: (a) the encoder scanning audio of an original copy and filtering an audible frequency band; (b) the divider dividing an audio signal of the original copy into a plurality of frequency ranges to generate a plurality of frequency drawers, and packaging the plurality of frequency drawers into a plurality of boxes; (c) the encoder generating a key signal according to a broadcasting time; (d) the divider selecting a frequency drawer minimizing the degradation of the generated key signal; (e) the encoder encoding the generated key signal using a quantization variable, and accumulating and inserting the encoded key signal into the audio signal of the original copy in the audible frequency band; (f) the encoder minimizing deformation of the selected frequency drawer and performing a first compression using the first codec; (g) the divider performing a second compression of a frequency drawer which has not been selected, using the second codec; and (h) the coupler receiving and coupling the frequency drawers, which have been subject to the first compression and the second compression, and outputting same as a single sound source. La présente invention concerne un procédé discret associé à des informations numériques faisant intervenir un signal audio de bande de fréquences audibles, qui est un procédé discret associé à des informations numériques faisant appel à un dispositif de codage comprenant un codeur, un diviseur, un coupleur, un premier codec et un second codec, comprenant les étapes consistant à : (a) balayer, au moyen du codeur, un contenu audio d'une copie d'original et à filtrer une bande de fréquences audibles; (b) diviser, au moyen du diviseur, un signal audio de la copie d'original en une pluralité de gammes de fréquences de façon à générer une pluralité de tiroirs de fréquences, et conditionner la pluralité de tiroirs de fréquences en une pluralité de cases; (c) générer, au moyen du codeur, un signal clé conformément à un temps de diffusion; (d) sélectionner, au moyen du diviseur, un tiroir de fréquences réduisant au minimum la dégradation du signal clé généré; (e) coder, au moyen du codeur, le signal clé généré au moyen d'une variable de quantification, et cumuler et insérer le signal clé codé en signal audio de la copie d'original dans la bande de fréquences audibles; (f) réduire au minimum, au moyen du codeur, la déformation du tiroir de fréquences sélectionné et effectuer une première compression à l'aide du premier codec; (g) effectuer, au moyen du diviseur, une seconde compression d'un tiroir de fréquences qui n'a pas été sélectionné, à l'aide du second codec; et (h) recevoir, au moyen du coupleur, les tiroirs de fréquences, qui ont fait l'objet de la première compression et de la seconde compression, et coupler ces derniers puis les délivrer sous forme de source sonore unique. 본 발명의 가청 주파수 대역 오디오 신호를 이용한 디지털 정보 스텔스 방법은 인코더, 분할기, 결합기, 제1 및 제2 코덱를 포함하는 인코딩 장치를 구비하는 디지털 정보 스텔스 방법에 있어서, (a) 인코더가 원본 오디오 스캐닝하여 가청 주파수 대역을 필터링하는 단계; (b) 분할기가 원본 오디오 신호를 복수개의 주파수 구간으로 분할하여 복수개의 주파수 서랍을 생성하고, 복수개의 주파수 서랍을 복수개의 박스로 패키징하는 단계; (c) 인코더가 방송 시간에 맞춰 키 신호를 생성하는 단계; (d) 분할기가 생성된 키 신호의 열화를 최소화하는 주파수 서랍을 선택하는 단계; (e) 인코더가 양자화 변수를 이용하여 생성된 키 신호를 암호화하고, 가청 주파수 대역의 원본 오디오 신호에 암호화된 키 신호를 누적하여 삽입하는 단계; (f) 인코더가 제1 코덱을 이용하여 선택된 주파수 서랍의 변형을 최소화하여 제1 압축을 하는 단계; (g) 분할기가 선택되지 않은 주파수 서랍을 제2 코덱을 이용하여 제2 압축을 하는 단계; (h) 결합기가 제1 및 제2 압축된 주파수 서랍을 인가받아 결합하여 하나의 음원으로 출력하는 단계;를 포함하는 것을 특징으로 한다.