Amplifiers – Unicontrol of coupling or the circuits associated therewith
Patent
1976-04-13
1977-10-18
Dahl, Lawrence J.
Amplifiers
Unicontrol of coupling or the circuits associated therewith
330278, 330129, 338139, H03F 100, H01C 1016
Patent
active
040548449
ABSTRACT:
An amplifying system comprises an amplifier having a certain constant gain, a first variable attenuator through which an input signal for this system is inputted to the amplifier, and a second variable attenuator through which the output signal of the amplifier is delivered. The over-all gain of the system is variable from the minimum gain to the maximum gain by gang-operating the two variable attenuators. The two variable attenuators are of such a construction that the attenuation factor of the first attenuator is substantially variable in the operation range near the middle of the variable gain whereas that of the second attenuator is substantially variable in the operation ranges near the minimum and maximum of the variable gain. When the input signal level is low, the second attenuator functions in the near-maximum range, and when high, the first attenuator functions in the middle range, thus delivering an output signal at the rated level. To decrease the output level further, the second attenuator functions in the near-minimum range. The S/N ratio of the output signal is good for various input signal level.
REFERENCES:
patent: 1673792 (1928-06-01), Affel
patent: 2492542 (1949-12-01), Stone
patent: 3296546 (1967-01-01), Schneider, Jr.
Dahl Lawrence J.
Nippon Gakki Seizo Kabushiki Kaisha
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