Method for reducing the influence of distortion products

Details Method for reducing the influence of distortion products Method for reducing the influence of distortion products

1992-01-31

1993-06-01

Hoff, Marc S.

Coded data generation or conversion

Converter compensation

375 39, H03M 106

Patent

active

052164250

ABSTRACT:
A method for reducing the influence of distortion product that are formed in conjunction with the analogue-digital-conversion of samples of an electric signal, from which signal two quadrature signals are formed prior to the conversion process. The quadrature signals are phase modulated prior to the conversion process and are phase demodulated subsequent to this conversion process, by phase-shifting the signals by a value which is changed randomly for each new sample. The energy content of individual distortion products is distributed over a broadband this in this way. This is due to correct demodulation of the useful signal, i.e., the fundamental tone, whereas harmonies and intermodulation products will have a residual phase modulation subsequent to the phase demodulating process.

REFERENCES:
patent: 4652838 (1987-03-01), Nossen
patent: 4788696 (1988-11-01), Sakane et al.
patent: 4875049 (1989-10-01), Yoshida
patent: 4888557 (1989-12-01), Puckette et al.
patent: 4926180 (1990-05-01), Anastassiou
patent: 5058134 (1991-10-01), Chevillat et al.
patent: 5170415 (1992-12-01), Yoshida et al.

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