Electrical computers: arithmetic processing and calculating – Electrical analog calculating computer – Particular function performed
Reexamination Certificate
2006-08-01
2006-08-01
Mai, Tan V. (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical analog calculating computer
Particular function performed
Reexamination Certificate
active
07085799
ABSTRACT:
An analog filter includes a first arithmetic operation section2-1having a plurality of sets of processing circuit being cascade connected, each processing circuit having an S/H circuit of plural stages for holding a ΔΣ-modulated signal and an analog adder for adding the input and output signals of the S/H circuit, in which the number of stages of the S/H circuits11-1, 14-1, 17-1and20-1decreases toward the end of cascade connection, and a second arithmetic operation section2-2configured in the same way, which are cascade connected. By using such an analog filter, over sampling and convolution of a ΔΣ-modulated signal are conducted so that the envelope of the filter output may be a quadratic curve of finite carrier that converges to zero at finite sampling points to prevent phase distortion of an LPF and a discretization error due to a conventional function. Compared with a conventional circuit for over-sampling and convolution, the number of stages of the S/H circuits and the number of adders are small.
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Connolly Bove & Lodge & Hutz LLP
Hume Larry J.
Mai Tan V.
Sakai Yasue
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