• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권2호
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• pp.662-675
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• 2018

Compression history detection plays an important role in digital multimedia forensics. Most existing works, however, mainly focus on digital image and video. Additionally, the existed audio compression detection algorithms aim to detect the trace of double compression. In real forgery scenario, multiple compression is more likely to happen. In this paper, we proposed a detection algorithm to reveal the compression history for MP3 audio. The statistics of the scale factor and Huffman table index which are the parameters of MP3 codec have been extracted as the detecting features. The experimental results have shown that the proposed method can effectively identify whether the testing audio has been previously treated with single/double/triple compression.

• 한국음향학회지
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• 제28권7호
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• pp.618-629
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• 2009

The MPEG-4 Audio Lossless Coding (ALS) standard belongs to the family MPEG-4 audio coding standards. In contrast to lossy codecs such as AAC, which merely strive to preserve the subjective audio quality, lossless coding preserves every single bit of the original audio data. The ALS core codec is based on forward-adaptive linear prediction, which combines remarkable compression with low complexity. Additional features include long-term prediction, multichannel coding, and compression of floating-point audio material. This paper describes the basic elements of the ALS codec with a focus on prediction, entropy coding, and related tools and points out the most important applications of this standardized lossless audio format.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 하계종합학술대회 논문집
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• pp.329-332
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• 1999

Currently, the most important technology is compression methods in the multimedia society. In audio compression, the method using human auditory nervous property is used. This method using psychoacoustical model is applied to perceptual audio coding, because human's audibility is limited. MPEG-II AAC(Advanced Audio Coding) is the most advanced coding scheme that is of benefit to high quality audio coding. The compression ratio is 1.4 times compared with MPEG-I layer-III. In this paper, the vector processor for MDCT/IMDCT(Modified Discrete Cosine Transform /Inverse Modified Discrete Cosine Transform) of MPEG-II AAC is designed.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 하계종합학술대회 논문집(4)
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• pp.110-113
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• 2000

In this paper, we consider the problem of digital audio watermarking to robust about compression without original audio data. We specifically address the audio watermarking using BPSK with variable carrier frequency. This technique make audio data embeded watermarking robust with compression attack, for example MPEG, AC-3, etc.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 학술대회지
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• pp.631-635
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• 2004

The rapid development of digital media and communication network urgently brings about the need of data certification technology to protect IPR (Intellectual property right). This paper proposed a new watermarking method for embedding contents owner's audio signal in order to protect color image IPR. Since this method evolves the existing static model and embeds audio signal of big data, it has the advantage of restoring signal transformed due to attacks. Three basic stages of watermarking include: 1) Encode analogue ID owner's audio signal using PCM and create new 3D audio watermark; 2) Interleave 3D audio watermark by linear bit expansion and 3) Transform Y signal of color image into wavelet and embed interleaved audio watermark in the low frequency band on the transform domain. The results demonstrated that the audio signal embedding in color image proposed in this paper enhanced robustness against lossy JPEG compression, standard image compression and image cropping and rotation which remove a part of image.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 G
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• pp.2262-2264
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• 1998

This paper propose a new method for the discrete signal : Discrete Wavelet Transform(DWT). This paper is a brief introduction to the DWT and applies the DWT coding for the audio data as an example. We can have a number of hint about the compression algorithm of multimedia resources and the high performance of transmission and storage.

• 방송공학회논문지
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• 제12권3호
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• pp.222-229
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• 2007

멀티미디어 부호화 기술의 발전에 따라 HDTV, DVD 등 고품질 멀티미디어 서비스가 가능하여 졌으며, 오디오의 경우 5.1채널 오디오의 사용범위가 점점 확대되어, 가정용 극장 시스템(Home Theater), 자동차용 극장 시스템(Car Theater)에 의해 일반 소비자들도 쉽게 접할 수 있는 서비스가 되었다. 지상파 DMB는 휴대용 방송 서비스로서 2005년 12월부터 본격적으로 서비스되고 있으나, 그 대역폭이 충분하지 않고 휴대용이라는 특성에 의해 멀티채널 오디오에 대한 고려를 하지 않고 있다. 최근 휴대용 방송 서비스를 위한 고효율 멀티채널 오디오 부호화 기술 표준화가 MPEG에서 추진되고 있음에 따라 DMB에서도 멀티채널 오디오 서비스에 대한 가능성이 열렸으며, 유럽에서는 이를 이용한 다양한 서비스를 시도하려고 계획하고 있다. 본 논문에서는 한국에서 서비스되고 있는 지상파 DMB를 통한 멀티채널 오디오 서비스의 가능성을 검증하기 위해 멀티채널 오디오 부호화 기술 및 검증 시스템의 구현에 대하여 기술하며, 향후 서비스 실현을 위한 가능성을 고찰하고자 한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 B
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• pp.977-979
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• 1995

MPEG-II is the international standard of compression for digital image and digital audio that is the most important in the multimedia environment. Now many researchers are developing relevant systems. MPEG-II consists of video, audio, system and the other part. In this paper, we have designed and demonstrated two channel audio encoder system that processes the audio compression part, and excutes layer II for complexity and psychoacoustic model II, with ADSP-21020 of Analog Device.

• 방송공학회논문지
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• 제16권5호
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• pp.714-721
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• 2011

MPEG 오디오에서는 오디오 신호의 효율적인 압축을 위해서 마스킹 효과, spectral band replication을 이용한 고주파 성분 합성, parametric stereo를 이용한 채널 확장 등의 기술을 이용하고 있다. 본 논문에서는 이 중 최신 기술에 해당하는 채널 확장 기술에 대해서 소개한다. 또한, MPEG 오디오 코덱 중 이 기술을 이용하는 HE-AAC v.2, MPEG Surround, Spatial Audio Object Coding(SAOC), Unified Speech and Audio Coding (USAC)에 대해 기술 소개 및 방송의 적용 예를 기술한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 하계종합학술대회 논문집
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• pp.538-541
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• 1999

MPEG-2 AAC(Advanced Audio Coding) is the most advanced coding scheme available for high quality audio coding. This MPEG-2 AAC audio Standard allows for ITU-R ‘indistinguishable’ quality according to at data rates of 320 kb/s for five full-bandwidth channel audio signals. The compression ratio is around a factor of 1.4 better compared to MPEG Layer 3, you get the same quality at 70% of the bitrate. This paper suggest optimization method for MDCT/IMDCT (Modified Discrete Cosine Transform/Inverse Modified Discrete Cosine Transform) in Encoder and Decoder for AAC.