Method and apparatus for code conversion of binary of multilevel

Details Method and apparatus for code conversion of binary of multilevel Method and apparatus for code conversion of binary of multilevel

1983-10-31

1985-07-09

Dobeck, B.

Communications: electrical

Audible indication

Percussion-type sound producer

375 17, 375 19, 375 20, H03K 1324

Patent

active

045285500

ABSTRACT:
Apparatus for converting binary to quaternary-level signals in which the symbols of selected words are inverted in order to eliminate the d-c component of the signal. In order to reduce the power spectral density at frequencies close to d-c and increase the power spectral density at frequencies close to the Nyquist rate, one word of each frame is selectively inverted relative to another in order to maximize the summation of all the numerical values of the differences between adjacent symbol levels. Thereafter both words of the frame are selectively inverted in order to minimize the running digital sum of the signal.

REFERENCES:
patent: 3457510 (1969-07-01), Lender
patent: 3753113 (1973-08-01), Maruta et al.
patent: 3754237 (1973-08-01), de Laage de Meux
patent: 3760277 (1973-09-01), Whang
patent: 3828346 (1974-08-01), Forster et al.
patent: 4408189 (1983-10-01), Betts et al.
patent: 4463342 (1984-07-01), Langdon et al.

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