Speech processor using controlled center clipping

Details Speech processor using controlled center clipping Speech processor using controlled center clipping

1974-10-11

1976-07-27

Claffy, Kathleen H.

179 1HF, 1791702, H04B 320

Patent

active

RE0289191

ABSTRACT:
An echo suppressor for full duplex telephone circuits consists of a filter bank of contiguous band filters in the transmission path, with each filter output feeding a separate center clipper. Each clipping level is controlled by echo signal amplitude as attenuated by the trans-hybrid loss that occurs in the corresponding subband. The scheme permits "double-talking" while suppressing the echo component.

REFERENCES:
patent: 3370294 (1968-02-01), Kahn
patent: 3500000 (1970-03-01), Kelly et al.
patent: 3567873 (1971-03-01), Peroni
patent: 3585311 (1971-06-01), Berkley et al.
patent: 3588385 (1971-06-01), Moye

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