Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Regenerating or restoring rectangular or pulse waveform
Patent
1995-07-31
1996-04-16
Gross, Anita Pellman
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Regenerating or restoring rectangular or pulse waveform
327312, 327552, 326 31, H03B 100, H03K 1716
Patent
active
055086470
ABSTRACT:
A noise shaper includes an incomplete integrator which conducts an addition of a present data and a last sampled data stored and a positive coefficient smaller than 1, a complete integrator which conducts an addition of a storage data before one sample delay and a present data, a three-value quantizing circuit which outputs 0, +1 or -1 signal as an output signal, and a feedback circuit which feeds-back the output signal from the three-value quantizing circuit to the incomplete integrator and the complete integrator. The noise shaper may further include a delay-data supply selection circuit which supplies the last sampled data stored and the positive coefficient to the incomplete integrator only when the output signal supplied from the three-value quantizing circuit through the feed-back circuit is zero. The output signal from the noise shaper can be made zero without deteriorating signal to noise (S/N) ratio when no input signal is inputted to the noise shaper.
REFERENCES:
patent: 3201705 (1965-08-01), Hanulec
patent: 4772871 (1988-09-01), Suzuki
patent: 5191331 (1993-03-01), Karema
IEEE Transactions on Circuit Theory, vol. CT-15 No. 4 Dec. 1968.
Peter J. A. Naus et al., "A CMOS Stereo 16-bit D/A Converter for Digital Audio", IEEE Journal of Solid-State Circuits, vol. SC-22, No. 3, Jun. 1987, pp. 390-394.
Gross Anita Pellman
NEC Corporation
Nguyen Tiep H.
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