Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1974-11-01
1976-11-30
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
3401461AB, H03K 1324, H04L 300
Patent
active
039952649
ABSTRACT:
An apparatus for processing data employs a modification of a zero modulation code. The zero modulation code has a waveform that is symmetrical about a zero signal level within narrow defined limits. Each data digit, 1 or 0, is encoded into two NRZI digits. A relaxed run length limitation allows use of a (d,k) code of (1,4), where (d) is the minimum number of 0 digits between 1 digits and (k) is the maximum number of 0 digits between 1 digits, without violating the frequency and charge constraints. Only five charge states and only one bit lookahead is needed in order to encode data in the (1,4) code.
REFERENCES:
patent: 3631471 (1971-12-01), Griffiths
patent: 3810111 (1974-07-01), Patel
International Business Machines - Corporation
Kallman N. N.
Sloyan Thomas J.
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