Apparatus and method for generating a high-accuracy 7-level corr

Details Apparatus and method for generating a high-accuracy 7-level corr Apparatus and method for generating a high-accuracy 7-level corr

1977-02-28

1978-04-25

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

325 38A, H04L 300

Patent

active

040865878

ABSTRACT:
Apparatus and method for generating a multilevel correlative signal wherein the multiple levels are digitally generated. A serial binary bit stream is first converted into two parallel binary bit streams each at half the bit rate of the original serial binary bit stream. The parallel bit streams are encoded in accordance with the relation B = C - .DELTA..sup.2 C MOD 4; where B is the original waveform, C is the resultant waveform, and .DELTA..sup.2 indicates two units delay or 2T seconds where 1/T is the parallel speed in digits per second. Next the binary encoded bit streams are digitally converted to a 7-level waveform; and, finally the 7-level waveform is transformed into an analog signal which retains the 7-levels and provides a band limited 7-level signal related on a one-to-one basis to the binary input signal.

REFERENCES:
patent: 3492578 (1970-01-01), Gerrish
patent: 3601702 (1971-08-01), Lender
patent: 3679977 (1972-07-01), Howson

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