[특허]Variable rate coder/decoder system

Variable rate coder/decoder system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04N-001/415
출원번호	US-0094867 (1993-07-22)
우선권정보	JP-0197091 (1992-07-23)
발명자 / 주소	Yoshikawa Hidetaka (Hino JPX)
출원인 / 주소	Kabushiki Kaisha Toshiba (Kawasaki JPX 03)
인용정보	피인용 횟수 : 45 인용 특허 : 0

초록 ▼

A variable rate coder/decoder system in which a quantizer, under control of a quantization controller, quantizes a signal obtained by subjecting discrete cosine transformation of a difference signal between an input signal and a signal from a frame memory storing therein a previous frame with a first quantization step width calculated based on a power value of the input signal calculated by a power calculator and a predetermined first signal-to-quantization noise ratio. In the system, further, a re-quantizer quantizes a difference signal between a signal being not quantized by the quantizer and a signal after the inverse quantization of an inverse quantizer with a second quantization step width calculated based on the power value controlled by a re-quantization controller and a predetermined second signal-to-quantization noise ratio. Variable length encoders subject the quantization output signals of the quantizer and re-quantizer to variable length encoding, decrease discard priority for the quantization output signal of the quantizer, increase discard priority for the quantization output signal of the re-quantizer, and then transmit them in the form of fixed-length cells or variable-length packets whereby, even when the amount of input data varies, its quality can be maintained constant and encoding and decoding can be realized with a high efficiency.

대표청구항 ▼

A variable rate coding system including a variable rate coder comprising: power calculation means for calculating an average power for each frame unit of an inputted digital video signal series; first difference calculation means for calculating a difference between one frame of the inputted digital video series and a frame immediately previous to said one frame of the digital video signal series; coordinate transformation means for subjecting the difference calculated by the first difference calculation means to a coordinate transformation; quantization means for quantizing an output of the coordinate transformation means; quantization control means for controlling a quantization step width of the quantization means on the basis of an output of the power calculation means; first variable length encoder means for subjecting an output of the quantization means to a variable length encoding; decoded signal generating means for subjecting the output of the quantization means to an inverse quantization and an inverse coordinate transformation, adding the output being subjected to the inverse coordinate transformation to the digital video signal series of said frame immediately previous to said one frame, and outputting an added signal to the first difference calculation means; second difference calculation means for calculating a difference between an inversely quantized signal generated by the decoded signal generating means and an output of the coordinate transformation means; re-quantization means for re-quantizing the difference calculated by the second difference calculation means; re-quantization control means for controlling a re-quantization step width of the re-quantization means on the basis of the output of the power calculation means; second variable length encoding means for subjecting an output of the re-quantization means to a variable length encoding; and multiplexing means for combining the outputs of the first and second variable length encoder means to output a combined signal, the combined signal being added with discard priorities in a manner such that the output of the second variable length encoder means is added with a higher discard priority than the discard priority added to the output of the first variable length encoder means.

이 특허를 인용한 특허 (45)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Variable rate coder/decoder system 원문보기

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Variable rate coder/decoder system 원문보기

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이 특허를 인용한 특허 (45)

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