Control circuit for automatic elimination of telephone line nois

Details Control circuit for automatic elimination of telephone line nois Control circuit for automatic elimination of telephone line nois

1991-03-22

1993-11-30

Dwyer, James L.

Telephonic communications

Transmission line conditioning

Interference suppression

381 94, 381 71, 328167, H04M 1100

Patent

active

052673103

ABSTRACT:
A control circuit for automatic elimination of telephone line noise, a reference tone selecting device for selecting the tone signal on the telephone line; a mode switching device for switching registration of noise pattern and operation of speech transmission; a noise pattern outputting device for outputting and storing frequency spectrum pattern in accordance with noise element coming on the telephone line during the noise pattern registration pattern; and a noise eliminating circuit for eliminating noise element from the transmission signal on the telephone line in accordance with the frequency spectrum pattern.

REFERENCES:
patent: 1114409 (1914-10-01), Speed
patent: 4649505 (1987-03-01), Zinser, Jr. et al.
patent: 5073924 (1991-12-01), Frisby
patent: 5131047 (1992-07-01), Hashimoto et al.

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