Means for deriving baud timing from an available AC signal
First Claim
1. Means for providing a baud timing signal from an AC signal having n half-cycles during each baud period, for use in demodulating a carrier signal bearing digital information via some predetermined variation in a characteristic of the carrier signal during each baud period, comprising:
- means for converting the carrier signal characteristic variation to a DC signal indicative of the digital data;
means for sampling the DC signal at the same point during each half-cycle of the AC signal;
means for summing the samples corresponding to the same half-cycle of the AC signal within each sequence of AC signal half-cycles occurring over successive baud periods, there being n such samples totals;
means for identifying the largest one of said n samples totals, andmeans for synchronizing the baud timing signal to the AC half-cycle yielding said largest samples total.
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Abstract
Baud timing is derived from an AC signal having n half-cycles during each baud period, for use in demodulating a carrier signal bearing digital information via some predetermined variation in a characteristic of the carrier signal during each baud period, by converting the carrier signal characteristic variation to a DC signal, sampling the DC signal at the same point during each half-cycle of the AC signal, summing the samples corresponding to the same half-cycle of the AC signal within each sequence of AC signal half-cycles occurring over successive baud periods, there being n such sample totals, identifying the largest one of the n totals and sychronizing the baud timing signal to the AC half-cycle corresponding thereto.
31 Citations
19 Claims
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1. Means for providing a baud timing signal from an AC signal having n half-cycles during each baud period, for use in demodulating a carrier signal bearing digital information via some predetermined variation in a characteristic of the carrier signal during each baud period, comprising:
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means for converting the carrier signal characteristic variation to a DC signal indicative of the digital data; means for sampling the DC signal at the same point during each half-cycle of the AC signal; means for summing the samples corresponding to the same half-cycle of the AC signal within each sequence of AC signal half-cycles occurring over successive baud periods, there being n such samples totals; means for identifying the largest one of said n samples totals, and means for synchronizing the baud timing signal to the AC half-cycle yielding said largest samples total. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for providing a baud timing signal from an AC signal having n half-cycles during each baud period, for use in demodulating a carrier signal bearing digital information via some predetermined variation in a characteristic of the carrier signal during each baud period, comprising:
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converting the carrier signal characteristic variation to a DC signal indicative of the digital data; sampling the DC signal at the same point during each half-cycle of the AC signal; summing the samples corresponding to the same half-cycle of the AC signal within each sequence of AC signal half-cycles occurring over successive baud periods, there being n such samples totals; identifying the largest one of said n samples totals, and synchronizing the baud timing signal to the AC half-cycle yielding said largest samples total. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A digital data receiver in which the baud timing signal is derived from an AC signal having n half-cycles during each baud period, the data being borne by a carrier having a characteristic which is varied in a predetermined manner during each baud period in accordance with the digital data, comprising:
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means for converting the carrier signal characteristic variation to a DC signal indicative of the data; means for sampling the DC signal at the same point during each half-cycle of the AC signal; means for summing the samples corresponding to the same half-cycle of the AC signal within each sequence of AC signal half-cycles occurring over successive baud periods, there being n such samples totals; means for identifying the largest one of said n samples totals; means for synchronizing the baud timing signal to the AC half-cycle yielding said largest samples total, and means for detecting the data from the DC signal employing the synchronized baud timing signal. - View Dependent Claims (16, 17, 18, 19)
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Specification