Journal ArticleDOI
An experimental study for a home-use digital VTR
Chojuro Yamamitsu,Akifumi Ide,Akira Iketani,Tatsuro Juri,S. Kadono,Chiyoko Matsumi,K. Matsushita,H. Mizuki +7 more
TLDR
A modified DCT (discrete cosine transform) has been developed for this system that needs only one-half the number of multipliers of a conventional DCT, making the hardware scale smaller.Abstract:
An experimental digital VTR system is described. A modified DCT (discrete cosine transform) has been developed for this system that needs only one-half the number of multipliers of a conventional DCT, making the hardware scale smaller. A data quantity estimator controls the variable-length coding for completion within a synchronization block, keeping the picture quality high. Three stages of error correction correct more errors and make the probability of miscorrection lower. A high area packing density of 270 Mb/in/sup 2/ is brought about by the use of a low-noise head amplifier, optimized payback signal processing, high-performance magnetic heads and tapes, and a stable tracking to narrow tracks. >read more
Citations
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Patent
Image processing apparatus
TL;DR: In this article, an image processing apparatus comprises a receiving device for receiving encoded image data which is encoded by using orthogonal transform in a predetermined block unit, an error detecting device for detecting a transmission error of the encoded data, a correcting device for correcting the transmission error in the predetermined block units, and a decoding device for decoding the encoded image and outputting image data for reproducing an image.
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Data compression using a feedforward quantization estimator
TL;DR: In this paper, an image data compression technique is described which utilizes calculating means and a selected series of bit calculating stages having delays, to estimate one or more quantization parameters for such data.
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High efficiency coding signal processing apparatus with error propagation influence reduction
Kenji Shimoda,Hitoshi Takeda +1 more
TL;DR: In this article, a bit rate reduction circuit quantizes a video signal and outputs the resultant signal to low and high-frequency encoders, respectively, in order to suppress error propagation, effectively correct errors, and reduce a signal deterioration upon repetitive coding processing.
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High efficiency coding recording and reproducing apparatus
TL;DR: In this article, a high efficiency coding recording and reproducing apparatus, wherein intra-frame coded and interframe coded data were recorded and the recorded coded data are reproduced and decoded, comprises a coding means coding a predetermined block within one picture with the frequency converted.
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Apparatus for magnetically recording digital data
TL;DR: In this paper, a digital VTR is provided with a block segmenting circuit for converting an input digital picture signal into data segmented into blocks of picture elements, an encoding circuit for compressing and encoding the output data of the block segmentation circuit block-by-block, a channel encoding circuit, an audio signal encoding circuit and an additional code generating circuit for generating an additional control code which includes subdata.
References
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Journal ArticleDOI
A Fast Computational Algorithm for the Discrete Cosine Transform
TL;DR: A Fast Discrete Cosine Transform algorithm has been developed which provides a factor of six improvement in computational complexity when compared to conventional DiscreteCosine Transform algorithms using the Fast Fourier Transform.
Journal ArticleDOI
Application of partial-response channel coding to magnetic recording systems
Hisashi Kobayashi,D. T. Tang +1 more
TL;DR: A conventional NRZI method of recording is shown to be equivalent to the "precoding" of this particular partial-response channel, the purpose of which is to limit the propagation of error in the channel output, and an error detection scheme is presented that takes full advantage of the inherent redundancy in the three-level channel output.
Journal ArticleDOI
An experimental study on bit rate reduction and high density recording for a home-use digital VTR
TL;DR: A system adopted that combines two bit rate reducing methods: interfield sub Nyquist sampling and the Hadamard transformation with vector quantization of the resulting joint energy distribution is reported on.