Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1989-02-24
1991-10-22
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
375 27, 3582611, 341 65, 341 67, 341 59, H03M 740, H03M 748
Patent
active
050602420
ABSTRACT:
An image signal processing system DPCM encodes the signal, then Huffman and run length encodes the signal to produce variable length code words, which are then tightly packed without gaps for efficient transmission without loss of any data. The tightly packing apparatus has a barrel shifter with its shift modulus controlled by an accumulator receiving code word length information. An OR gate is connected to the shifter, while a register is connected to the gate. Apparatus for processing a tightly packed and decorrelated digital signal has a barrel shifter and accumulator for unpacking, a Huffman and run length decoder, and an inverse DCPM decoder.
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"32-Bit Cascadable Barrel Shifter/Normalizer General Information," Logic Devices, Inc., Product Catalog, Sunnyvale, CA, pp. 2-5, Mar. 1985.
Davis Jr. James C.
General Electric Company
Safourek Benedict V.
Tse Young
Webb II Paul R.
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