Maximum value tracing circuit for digitized voice signals

Details Maximum value tracing circuit for digitized voice signals Maximum value tracing circuit for digitized voice signals

1974-12-09

1977-06-07

Cooper, William C.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

1791708, 307351, 328151, H04B 322

Patent

active

040285065

ABSTRACT:
A maximum value tracing circuit employed in echo suppressors and the like for selecting the peak values of digitized voice signals. The digitized value of a signal previously stored in a register is continuously compared with the present digitized value. The larger value of the compared signals is stored in the register after application of each clear signal to the register.
First and second maximum value tracing circuits of the type described may be employed in combination with a comparator-selector circuit for comparing the outputs of the first and second maximum value extraction circuits to produce a comparison output signal representative of the larger of the two compared outputs derived from the first and second maximum value extraction circuits, which output signal is utiized for providing reliable, high speed echo suppression.

REFERENCES:
patent: 3508158 (1970-04-01), Marchese
patent: 3596011 (1971-07-01), Alexandrovich
patent: 3643169 (1972-02-01), Klein
patent: 3660603 (1972-05-01), Andersen
patent: 3725585 (1973-04-01), Moniak et al.
patent: 3794763 (1974-02-01), Boudewijns et al.
patent: 3823275 (1974-07-01), La Marche et al.
patent: 3826878 (1974-07-01), Bendel
patent: 3924078 (1975-12-01), Bussey
E. Fariello, "A Digital Echo Suppressor For Satellite Circuits," IEEE Transactions on Communications, Dec. 1972, pp. 1176-1181.

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