Detecting codewords

Details Detecting codewords Detecting codewords

1984-12-10

1986-10-07

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

375106, H03M 742

Patent

active

046162119

ABSTRACT:
A method and apparatus for detecting digital codewords or predetermined portions of digital codewords in a stream of codewords is described. The apparatus comprises a shift register (21) having a length at least one bit greater than the length of the longest codeword or predetermined codeword portion to be detected; and means including an inverter (24) for loading the shift register (21) with the logical complement of the leading bit of the stream of codewords. A clock (25) is provided to cause data in the data stream to be serially shifted into the shift register (21). The contents of the shift register after each shift are then used to address one or more PROMs (26) to determine whether the data in the shift register (21) upstream of the first change between data in the shift register of one type and data in the shift register of the complementary type comprises a codeword or a predetermined codeword portion.

REFERENCES:
patent: 3016527 (1962-01-01), Gilbert
patent: 4177456 (1979-12-01), Fukinuki

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