US Patent No: 4,569,058

Number of patents in Portfolio can not be more than 2000

Transmission system

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Abstract

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A transmission system wherein PCM code words are converted into DPCM code words at the transmit side and are reconverted into PCM code words at the receive side. A DPCM coder comprising a respective quantizer for variable-length code words, a quantizer for code words having a fixed, below-average length, and a DPCM decoder comprising a code converter for variable-length code words and a code converter for code words having a fixed, below-average length are provided for this purpose. The type of conversion for the next PCM code word present at the input is selected after each conversion on the basis of the number of memory locations that still exist. This transmission system is suitable for data reduction, particularly of digital video signals.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SIEMENS AKTIENGESELLSCHAFTMUNICH18331

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Grallert, Hans-Joachim Groebenzell, DE 10 139

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Nippon Electric Co., Ltd. (1)
4,517,596 System comprising a preliminary processing device controlled in accordance with an amount of information stored in a buffer 40 1982
 
WESTERN ELECTRIC COMPANY, INCORPORATED (1)
4,491,953 Dual mode coding 16 1982

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
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RE36559 Method and apparatus for encoding audio signals divided into a plurality of frequency bands 1 1994
5,581,654 Method and apparatus for information encoding and decoding 20 1994
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5,617,219 Apparatus and method for data compression and expansion using hybrid equal length coding and unequal length coding 13 1995
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5,781,586 Method and apparatus for encoding the information, method and apparatus for decoding the information and information recording medium 11 1995
5,832,426 High efficiency audio encoding method and apparatus 5 1995
5,819,214 Length of a processing block is rendered variable responsive to input signals 22 1997
5,752,224 Information encoding method and apparatus, information decoding method and apparatus information transmission method and information recording medium 21 1997
 
GENERAL ELECTRIC COMPANY (3)
4,914,675 Apparatus for efficiently packing data in a buffer 28 1988
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CANON KABUSHIKI KAISHA (1)
5,166,958 Coding apparatus with low-frequency and DC suppression 5 1990
 
COMPUPIX TECHNOLOGY, INC., 5301 NORTH FEDERAL HWY., SCCA RATON, FL 33431 A CORP. OF FL (1)
4,665,436 Narrow bandwidth signal transmission 38 1985
 
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NEC CORPORATION (1)
4,706,265 Code converting system and method for band compression of digital signals 80 1985
 
RCA Corporation (1)
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SIEMENS AKTIENGESELLSCHAFT (1)
4,651,194 Arrangement for multiplexing luminance and chrominance code words of variable length 5 1984
 
The United States of America as represented by the Secretary of the Navy (1)
5,136,290 Message expansion decoder and decoding method for a communication channel 9 1990
 
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VTECH INDUSTRIES, INC. (1)
5,696,791 Apparatus and method for decoding a sequence of digitally encoded data 41 1995