초록

A snow plow including a snow plow blade and snow plow strap to attach the snow plow blade to a vehicle. An associated method of attaching a snow plow blade to a vehicle is also provided.

대표청구항 ▼

A snow plow including a snow plow blade and snow plow strap to attach the snow plow blade to a vehicle. An associated method of attaching a snow plow blade to a vehicle is also provided. s in the preliminary sequence; and (viii) a guided error corrector, responsive to the second error pattern detec

A snow plow including a snow plow blade and snow plow strap to attach the snow plow blade to a vehicle. An associated method of attaching a snow plow blade to a vehicle is also provided. s in the preliminary sequence; and (viii) a guided error corrector, responsive to the second error pattern detector and the error syndrome, for correcting errors detected in the preliminary sequence by the second error pattern detector. 2. The sampled amplitude read channel as recited in claim 1, wherein the error syndrome is generated according to a convolution code. 3. The sampled amplitude read channel as recited in claim 2, wherein: (a) the preliminary sequence comprises a plurality of codewords where each codeword comprises codeword data and an appended convolution code check bit; (b) at least one of the convolution code check bits of a first codeword is a function of the codeword data of a plurality of the codewords; (c) the error syndrome comprises a plurality of syndrome bits corresponding to a plurality of the check bits; and (d) the guided error corrector corrects an error event detected in a current codeword using the error syndrome. 4. The sampled amplitude read channel as recited in claim 3, wherein the error syndrome comprises a first error syndrome identifying a first error event and a second error syndrome identifying a second error event. 5. The sampled amplitude read channel as recited in claim 4, wherein the first and second error syndromes are overlapping due to the first and second error events ocurring in codewords that are located near one another. 6. The sampled amplitude read channel as recited in claim 3, wherein: (a) the first error pattern detector detects error events relative to a Euclidean distance between corrected sample values and sample values of valid output sequences; and (b) the second error pattern detector detects error events consistent with the error syndrome. 7. The sampled amplitude read channel as recited in claim 3, wherein the first error pattern detector and unguided error corrector operate on a first codeword concurrent with the second error pattern detector and guided error corrector operating on a second codeword. 8. The sampled amplitude read channel as recited in claim 1, wherein: (a) the unguided error corrector modifies the filtered sample errors to reflect a correction made to the preliminary sequence; and (b) the second error pattern detector is responsive to the modified filtered sample errors. 9. The sampled amplitude read channel as recited in claim 1, wherein the unguided error corrector modifies the error syndrome to reflect a correction made to the preliminary sequence. 10. The sampled amplitude read channel as recited in claim 1, wherein the guided error corrector modifies the error syndrome to reflect a correction made to the preliminary sequence. 11. A sampled amplitude read channel for reading data recorded on a disk storage medium by detecting an estimated data sequence from a sequence of read signal sample values generated by sampling an analog read signal emanating from a read head positioned over the disk storage medium, the sampled amplitude read channel comprising: (a) a channel encoder for encoding user data into error detection codewords according to a convolution code, wherein the error detection codewords are written to the disk storage medium; (b) a sampling device for sampling the analog read signal to generate the read signal sample values; (c) a trellis sequence detector for detecting a preliminary sequence from the read signal sample values; and (d) a post processor for detecting and correcting errors in the preliminary sequence comprising: (i) a remodulator for remodulating the preliminary sequence into a sequence of estimated sample values; (ii) a sample error generator, responsive to the read signal sample values and the estimated sample values, for generating a sequence of sample errors; (iii) a sample error filter for filtering the sample errors to generate filtered sample errors; (iv) a syndrome generator, responsive to the preliminary sequence, for generating an error syndrome according to the convolution code; (v) an error pattern detector, responsive to the filtered sample errors, for detecting errors in the preliminary sequence; and (vi) a guided error corrector, responsive to the error pattern detector and the error syndrome, for correcting errors detected in the preliminary sequence. 12. The sampled amplitude read channel as recited in claim 11, wherein the error pattern detector comprises a second error pattern detector, the sampled amplitude read channel further comprising a first error pattern detector, responsive to the sample errors, for detecting errors in the preliminary sequence. 13. The sampled amplitude read channel as recited in claim 12, further comprising an unguided error corrector, responsive to the first error pattern detector, for correcting errors detected in the preliminary sequence. 14. The sampled amplitude read channel as recited in claim 13, wherein: (a) the preliminary sequence comprises a plurality of codewords, each codeword comprising codeword data and an appended convolution code check bit; (b) at least one of the convolution code check bits of a first codeword is a function of the codeword data of a plurality of the codewords; (c) the error syndrome comprises a plurality of syndrome bits corresponding to a plurality of the check bits; and (d) the guided error corrector corrects an error event detected in a current codeword using the error syndrome. 15. The sampled amplitude read channel as recited in claim 14, wherein the error syndrome comprises a first error syndrome identifying a first error event and a second error syndrome identifying a second error event. 16. The sampled amplitude read channel as recited in claim 15, wherein the first and second error syndromes are overlapping due to the first and second error events ocurring in codewords that are located near one another. 17. The sampled amplitude read channel as recited in claim 14, wherein: (a) the first error pattern detector detects error events relative to a Euclidean distance between corrected sample values and sample values of valid output sequences; and (b) the second error pattern detector detects error events consistent with the error syndrome. 18. The sampled amplitude read channel as recited in claim 14, wherein the unguided error corrector operates on a first codeword concurrent with the guided error corrector operating on a second codeword. 19. The sampled amplitude read channel as recited in claim 13, wherein the unguided error corrector modifies the filtered sample errors to reflect a correction made to the preliminary sequence. 20. The sampled amplitude read channel as recited in claim 13, wherein the unguided error corrector modifies the error syndrome to reflect a correction made to the preliminary sequence. 21. The sampled amplitude read channel as recited in claim 11, wherein the guided error corrector modifies the error syndrome to reflect a correction made to the preliminary sequence. 22. A method of reading data recorded on a disk storage medium by detecting an estimated data sequence from a sequence of read signal sample values generated by sampling an analog read signal emanating from a read head positioned over the disk storage medium, the method comprising the steps of: (a) sampling the analog read signal to generate the read signal sample values; (b) detecting a preliminary sequence from the read signal sample values; (c) remodulating the preliminary sequence into a sequence of estimated sample values; (d) generating a sequence of sample errors from the read signal sample values and the estimated sample values; (e) first detecting errors in the preliminary sequence from the sample errors; (f) first correcting errors detected in the preliminary sequence; (g) generating an error syndrome from the preliminary sequence according to a predetermined error detection code; (h) second detecting errors in the preliminary sequence from the sample errors and the error syndrome; and (i) seco