Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1986-07-23
1987-12-29
LaRoche, Eugene R.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332 17, 329104, 329109, 375 19, 375 39, 371 2, H03K 700, H03K 900
Patent
active
047163852
ABSTRACT:
In a multilevel modulator for use in modulating an input digital signal of N levels into a multilevel modulated signal, the input digital signal is converted by a code converting unit into a major converted signal for the input digital signal and a minor converted signal corresponding to the major converted signal. The major converted signal is rearranged into groups each of which consists of a predetermined number of levels smaller than N and which is produced in a time division fashion together with with minor converted signal. A signal producing unit processes each group to produce a Lee-error correcting code sequence. Alternatively, major and minor converted signals are produced on quadrature-phase amplitude modulation of a circular signal arrangement of N-levels to divide the circular signal arrangement into a square signal arrangement and the remaining signal arrangement. In a counterpart multilevel demodulator, an inverse operation is carried out to reproduce the input digital signal.
REFERENCES:
patent: 4529950 (1985-07-01), Chazenfus et al.
Noda Seiichi
Yoshimoto Makoto
LaRoche Eugene R.
Mis David
NEC Corporation
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