Analog to digital converter with noise suppression

Communications: electrical – Audible indication – Percussion-type sound producer

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H03K 13175

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active

040329143

ABSTRACT:
An analog signal to be converted into a high resolution digital signal is first converted to a coarsely quantized signal by a direct feedback coder. A group of successive coarsely quantized signals are then processed by a converter which produces the high resolution digital signal. In the converter, the processing is performed by an arrangement of two accumulators. The first accumulator provides an output signal indicative of the running sum of each group of coarsely quantized signals. The second accumulator has the capability of providing an accumulation of either the negative or the positive of the output signal of the first accumulator. A negative accumulation is used for a first portion of the group and a positive accumulation is used for the second portion of the group to provide a net sum. The net sum is a triangularly weighted accumulation of the successive signals in the group which occasions self-cancelling of the quantizing noise inherent to the direct feedback coder. Each net sum is used to form a code word of several digital bits in a high accuracy signal. Utilization of a third portion between the first and second portions of the group in which the second accumulator is idle provides a trapezoidal weighting in the net sum. The latter weighting provides a further improvement in resolution and accuracy.

REFERENCES:
patent: 3192371 (1965-06-01), Brahm
patent: 3716849 (1973-02-01), Metcalf
patent: 3879724 (1975-04-01), McDonald
Saufley et al., "Rev. Sci. Instrum., vol. 45, No. 7, July 1974, pp. 882-887.

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