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Class Information
Number: 330/149
Name: Amplifiers > Hum or noise or distortion bucking introduced into signal channel
Description: Subject matter wherein the signal has a hum or noise component inadvertently introduced therein, as where there is ineffective filtering of a rectified A.C. power supply or bias, and wherein such objectional component is removed or reduced by the same hum or noise component introduced into the signal path of the amplifier in such manner as to oppose the objectional signal component, thereby removing it from, or reducing it in, the output signal.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4700151 |
Modulation system capable of improving a transmission system |
Oct. 13, 1987 |
| 4692709 |
Parallel input signal processor for low-level signal, high-noise environments |
Sep. 8, 1987 |
| 4692712 |
Differential impedance neutralization circuit |
Sep. 8, 1987 |
| 4684899 |
Audio amplifier for a motor vehicle |
Aug. 4, 1987 |
| 4682119 |
Class AB amplifier and a distortion corrector therefor |
Jul. 21, 1987 |
| 4677389 |
Noise-dependent volume control having a reduced sensitivity to speech signals |
Jun. 30, 1987 |
| 4677390 |
Low-power feedforward amplifier |
Jun. 30, 1987 |
| 4673886 |
Adaptively stabilized RF amplifier |
Jun. 16, 1987 |
| 4673889 |
Apparatus and method for muting an output signal in a switching amplifier |
Jun. 16, 1987 |
| 4673898 |
Wide band quadrature hybrid |
Jun. 16, 1987 |
| 4667146 |
Voltage-controlled push-pull current source |
May. 19, 1987 |
| 4659998 |
Voltage follower |
Apr. 21, 1987 |
| 4656434 |
RF power amplifier with load mismatch compensation |
Apr. 7, 1987 |
| 4644290 |
Metal detector audio amplifier |
Feb. 17, 1987 |
| 4644292 |
Automatic gain and frequency characteristic control unit in audio device |
Feb. 17, 1987 |
| 4639938 |
RF pulse transmitter having incidental phase modulation (IPM) correction |
Jan. 27, 1987 |
| 4638258 |
Reference load amplifier correction system |
Jan. 20, 1987 |
| 4636739 |
Circuit for reducing the occurrence of spurious signals on an output of an electronic circuit when the circuit power supply is switched on and off |
Jan. 13, 1987 |
| 4634996 |
Operational amplifier |
Jan. 6, 1987 |
| 4633190 |
Voltage and current source fluctuation compensator and method |
Dec. 30, 1986 |
| 4633191 |
Transformer isolated high voltage, high power amplifier system |
Dec. 30, 1986 |
| 4631491 |
Bipolar transistor RF power amplifier |
Dec. 23, 1986 |
| 4629995 |
Variable emphasis circuit |
Dec. 16, 1986 |
| 4629996 |
Feed-forward microwave power amplifier with difference signal distortion cancellation circuit |
Dec. 16, 1986 |
| 4628278 |
Low even-order harmonic distortion amplifier and method |
Dec. 9, 1986 |
| 4625178 |
Feedforward gain block with mirror image error amplifier |
Nov. 25, 1986 |
| 4617522 |
Temperature regulated feedforward amplifier |
Oct. 14, 1986 |
| 4614914 |
Low-distortion transformer-coupled circuit |
Sep. 30, 1986 |
| 4609878 |
Noise reduction system |
Sep. 2, 1986 |
| 4605906 |
Differential pair amplifier enhancement circuit |
Aug. 12, 1986 |
| 4600892 |
RF amplifier with frequency spectrum control |
Jul. 15, 1986 |
| 4595882 |
Phase adjusted feedforward error correction |
Jun. 17, 1986 |
| 4594559 |
Metal detector audio amplifier |
Jun. 10, 1986 |
| 4594561 |
Audio amplifier with resistive damping for minimizing time displacement distortion |
Jun. 10, 1986 |
| 4591800 |
Linear power amplifier feedback improvement |
May. 27, 1986 |
| 4588958 |
Adjustable reflective predistortion circuit |
May. 13, 1986 |
| 4588959 |
Hum neutralization circuit |
May. 13, 1986 |
| RE32132 |
Video signal play-back circuit |
Apr. 29, 1986 |
| 4583049 |
Feed-forward circuit |
Apr. 15, 1986 |
| 4580105 |
Automatic reduction of intermodulation products in high power linear amplifiers |
Apr. 1, 1986 |
| 4577159 |
Low drift broadband amplifier |
Mar. 18, 1986 |
| 4577160 |
Method of and apparatus for low noise current amplification |
Mar. 18, 1986 |
| 4577161 |
Noise reduction by linear interpolation using a dual function amplifier circuit |
Mar. 18, 1986 |
| 4574390 |
Noise reduction for stereophonic FM signals by high-speed sampling and linear interpolation |
Mar. 4, 1986 |
| 4571553 |
Amplifier circuit with distortion cancellation function |
Feb. 18, 1986 |
| 4567443 |
Low-distortion audio amplifier circuit arrangement |
Jan. 28, 1986 |
| 4564816 |
Predistortion circuit |
Jan. 14, 1986 |
| 4563656 |
Wideband transimpedance optical receiver |
Jan. 7, 1986 |
| 4562406 |
Current controlled amplifier |
Dec. 31, 1985 |
| 4560945 |
Adaptive feedforward cancellation technique that is effective in reducing amplifier harmonic distortion products as well as intermodulation distortion products |
Dec. 24, 1985 |
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