Amplifiers – Signal feedback – Phase shift means in loop path
Patent
1980-07-01
1982-10-12
Mullins, James B.
Amplifiers
Signal feedback
Phase shift means in loop path
330151, 330304, 333 28R, H03F 368
Patent
active
043541607
ABSTRACT:
An amplitude equalizer, suitable for use on telephone lines, is disclosed. The circuit includes an adjustable-gain amplifier, and an adjustable-slope equalizer section. A mixer section serves to combine the input signal with a filtered version thereof, in a manner which enables the installer to bring the line of response to specification level at a first predetermined frequency, and then to bring the line to specification level at a second frequency, without disturbing the previously achieved gain at the first frequency.
REFERENCES:
patent: 3940709 (1976-02-01), Heaslett
Kalb, "A Novel Active Filter", EEE, Feb. 1971, p. 61.
Tellabs Model 4001, 4002, and 4003 Line Amplifiers, Copyright Jun. 2, 1977, and Jan. 2, 1978.
Wescom Model 401 and 4011 Line Amplifiers, Dated Apr. 1977 and Aug. 1972, respectively.
Wescom Model 7406, 7407, 7408, and 7811 Amplitude Equalizers, Jul. 1974 and Nov. 1977, respectively.
Bell System Practices, "950A-Type Equalizer", Oct. 1974.
Western Electric Metallic Facility Terminal, 4-4 Wire Repeaters, 2-4 Wire Repeater, Aug. 1975.
Western Electric Metallic Facility Terminal, 4-Wire Transmission Units (J99343RA, SA, SB), SD-1C359-01, Aug. 1975.
Kentrox Industries, Inc.
Mullins James B.
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