Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1982-11-08
1985-01-08
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
3401462, H04L 702
Patent
active
044930933
ABSTRACT:
The concept of the disclosed invention is to discern the start and end of bytes within a bit stream without the provision of special sync-defining bits, utilizing for such purpose the statistical character of the bit stream. Because actual signal processing circuits inherently do not have sharp cutoffs, this means that aliasing-free sampling of an analog signal must be at some sampling rate greater than twice the highest frequency (of interest) within the analog signal. Since the sampling in question is above the theoretically lowest possible sampling frequency, even the highest frequency components within the analog signal so sampled will be sampled at more than twice per cycle; and, attendantly, after the analog signal samples are quantized into a bit stream, a statistical distribution relating to the frequency at which the bits in the bit stream switch their states will become apparent . . . lower significant bits switching between ONEs and ZEROs at rates greater than the switching rates of more significant bits. By monitoring the switching transitions for the bits in a bit stream, the start and end of the bytes thereof may be discerned.
REFERENCES:
patent: 3546592 (1970-12-01), Mayo
patent: 3842399 (1974-10-01), Kneuer et al.
patent: 4091425 (1978-05-01), Dakin
patent: 4132975 (1979-01-01), Koike
patent: 4206440 (1980-06-01), Doi et al.
patent: 4228467 (1980-10-01), de Loye et al.
patent: 4247936 (1981-01-01), Hustig
patent: 4276544 (1981-06-01), Iinuma
patent: 4276650 (1981-06-01), de Jager et al.
patent: 4279018 (1981-07-01), Carson
patent: 4296440 (1981-10-01), Rosenheck
patent: 4328580 (1982-05-01), Stockham, Jr. et al.
patent: 4347606 (1982-08-01), Hoogeveen
Cody Robert F.
Eastman Kodak Company
Safourek Benedict V.
LandOfFree
Zero overhead sync in data recording does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Zero overhead sync in data recording, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zero overhead sync in data recording will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-117060