Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1972-01-28
1977-01-04
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
H03K 1324
Patent
active
040018113
ABSTRACT:
An NRZL bit stream is encoded by shifting the bit stream through a 9 bit storage register while logic gates detect and compare the level of adjacent bits stored in the register. The state of an output bit stream is changed if the bits stored in positions 8 and 9 of the register are alike and the change occurs at one or the other of two different times during bit time depending upon whether the pair of like bits are "1's" or "0's". If in addition to the detection of a pair of like bits in positions 8 and 9, an alternate bit pattern is detected in positions 1 through 7 of the register, changes in the output bit stream are forced at a rate of 11/2 bit time intervals until a pair of like bits are detected in positions 5 and 6 of the register. The first of the 11/2 bit time interval state changes occurs at 2 or 21/2 bit times after the state change resulting from detection of a pair of like bits depending upon the level of the bits stored in position 7 of the register. If the bit stored in position 7 of the register is the same as the bits stored in positions 8 and 9 of the register the level of the bit stored in position 8 is inverted after detection of the pair of like bits in positions 8 and 9 so that only discrete pairs of bits are detected. The output bit stream may be subsequently decoded and converted to NRZL by detecting when a state change occurs relative to bit time and the bit time interval between successive state changes.
REFERENCES:
patent: 3281866 (1966-10-01), Lawrance et al.
patent: 3374475 (1968-03-01), Gabor
patent: 3488663 (1970-01-01), Rosenblatt
patent: 3560947 (1971-02-01), Franchini
patent: 3564557 (1971-02-01), Ruthazer
patent: 3623041 (1971-11-01), MacDougall, Jr.
patent: 3671960 (1972-06-01), Sollman et al.
Duke Albert F.
General Motors Corporation
Miller Charles D.
LandOfFree
Method and apparatus for coding and decoding digital information does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for coding and decoding digital information, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for coding and decoding digital information will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-258936