DR. EDWARD J. WELDON, M.D.
Medical Practice at King St, Honolulu, HI

5140596, Aug 18, 1992

Feb 20, 1990

7/481427

Edward J. Weldon - Honolulu HI

Eastman Kodak Company - Rochester NY

H03M 1300

371 391

Interleaved cyclic error correction encoded binary data, of the type employed in the compact audio disk standard for example, in which the parity characters are located in the middle of a codeword, are encoded by a serial encoder to greatly increase the speed at which such data may be recorded. In the invention, the message characters are treated as two polynomials, a left-hand sub-codeword or message block representing the message characters to the left of the parity characters and a right-hand sub-codeword or message block representing the message characters to the right of the parity characters. The encoder of the invention has two parallel inputs which simultaneously receive the message characters of the right-hand and left-hand sub-codewords, respectively, each input receiving one character at a time in serial fashion. The encloder is a serial register in which each stage receives the sum of the contents of the previous stage and (a) the product of the current character of the left-hand sub-codeword multiplied by a respective coefficient of the code generator polynomial and (b) the product of the current character of the left-hand sub-codeword multiplied by a respective coefficient of the residue of an algebraic shift factor, whose degree is equal to the length of the cyclic error correction code minus the length of the sub-codeword, divided by the code generator polynomial.

5220568, Jun 15, 1993

Nov 9, 1989

7/433877

Dennis G. Howe - Pittsford NY
Edward J. Weldon - Honolulu HI
Hugh M. Hilden - Honolulu HI

Eastman Kodak Company - Rochester NY

H03M 1300, H03M 746

371 371

Channel encoded data (for example run length limited encoded data) is further encoded in accordance with a shift correction code prior to transmission. Upon reception, forward and backward shift errors present in the received channel encoded data are corrected by a shift correction decoder. The shift error correction is accomplished using a code, such as (for example) a BCH code over GF(p) or a negacyclic code, which treats each received symbol as a vector having p states. For a single shift error correction, p=3 and there are three states (forward shift, backward shift, no shift). In one embodiment, conventional error correction codewords which encode the user data may be interleaved within successive shift correction codewords prior to channel encoding, thereby enabling the error correction system to easily handle a high rate of randomly distributed shift errors (which otherwise would result in a high rate of short error bursts that exceed the capacity of the block error correction code).

4217808, Aug 19, 1980

Nov 16, 1978

5/961401

David Slepian - Summit NJ
Edward J. Weldon - Honolulu HI

G10G 702, G01R 2302

84454

Method and apparatus for determining pitch by establishing the fundamental period of an incoming acoustic wave and comparing this fundamental period with the period of certain standard pre-established tones. The name of the standard tone with period closest to the measured fundamental period of the incoming wave is indicated and displayed. Also displayed is an indication of the degree and direction of any deviation between the pitch of the incoming wave and that of the displayed standard tone.

5257270, Oct 26, 1993

Dec 26, 1990

7/633879

Hugh M. Hilden - Honolulu HI
Dennis G. Howe - Pittsford NY
Edward J. Weldon - Honolulu HI

Eastman Kodak Company - Rochester NY

H03M 1300, H03M 746

371 371

A method for coding/decoding ternary symbols to d,k-constrained binary runs in a way that (i) associates (codes) a number of ternary symbols with a lesser number of d,k-constrained binary runs and (ii) provides that an individual single-shift error in any of the received binary runs that constitute a binary data codeword will cause at most one ternary symbol to be in error in the associated (decoded) ternary symbol codeword. This method allows shift-correction codeword parity checks to be transmitted (i. e. , transformed to a d,k-constrained channel data sequence) with increased efficiency, so that the required number of channel bits needed to represent the parity checks is decreased.