Detecting accurrences of redundant digital codewords
First Claim
1. A method for detecting redundant digital codewords repeatedly transmitted over a digital transmission system, comprising determining the values of bits in corresponding bit-positions of consecutive n bit codewords and providing, in response to said values, a codeword detected signal when there are at least JM equal bit values for each of the n bit-positions of the codewords, in M consecutive codewords, where JM is a preselectable threshold less than M.
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Abstract
Detection of repeatedly transmitted redundant digital codewords is provided by checking corresponding bi-positions for consecutive n bit codewords, counting the number of ones and zeros for each bit-position. When there is at least a preselected threshold JM of equal bit values for each of the n bit-positions of the codewords, in M or less consecutive codewords, the detection process is complete.
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Citations
11 Claims
- 1. A method for detecting redundant digital codewords repeatedly transmitted over a digital transmission system, comprising determining the values of bits in corresponding bit-positions of consecutive n bit codewords and providing, in response to said values, a codeword detected signal when there are at least JM equal bit values for each of the n bit-positions of the codewords, in M consecutive codewords, where JM is a preselectable threshold less than M.
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3. A method for detecting redundant digital codewords repeatedly transmitted over a digital transmission system, comprising:
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reading a given bit of each of a plurality of the M codewords; counting, for plural bit values, the number of said bits assuming each bit value; comparing said count against a predetermined threshold JM and outputting a bit value signal and a bit detected signal when said count equals or exceeds JM ; and repeating the above sequence of steps for each of the remaining bit-positions in the codewords. - View Dependent Claims (4, 5, 6)
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7. A method for detecting redundant digital codewords repeatedly transmitted over a digital transmission system, comprising:
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storing M codewords in a memory having a bit capacity of at least n×
M, where n is the number of bits in a codeword;reading from said memory a plurality of bits with memory locations spaced every nth bit, starting with a given bit; counting ones and zeros in the bits read; comparing the counted number of ones and zeros against a predetermined threshold JM, and outputting a bit value signal and a bit detected signal when either count equals or exceeds JM ; storing said bit value signal in a memory having a capacity of at least n bits; storing said bit detected signal in a memory having a capacity of at least n bits; repeating the preceding five steps for each of the remaining bit-positions in the codewords; providing a codeword detected signal from said bit detected signal memory if the latter reaches a content of n bits; and providing a codeword value signal from said bit value signal memory.
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8. A digital codeword detector for detecting redundant codewords repeatedly transmitted over a digital transmission system, comprising:
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a first memory having a bit capacity of at least n×
M for storing M codewords, each n bits long;means for reading from said first memory a given bit-position of each of a plurality of M codewords; count and compare means for counting, for plural bit values, the number of said bit-positions read which contain each bit value and comparing said count against a predetermined threshold JM, and outputting a bit value signal and a bit detected signal when said count equals or exceeds JM ; a second memory, having a capacity of at least n bits and responsive to said count and compare means, for storing said bit detected signal, and outputting a codeword detected signal if its content reaches n bits; and a third memory, having a capacity of at least n bits and responsive to said count and compare means, for storing said bit value signal, and outputting a codeword value signal. - View Dependent Claims (9, 10, 11)
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Specification