| Patent Number |
Title Of Patent |
Date Issued |
| RE31545 |
Feed-forward amplifier |
March 27, 1984 |
| A high-precision amplifier employs a feed-forward technique to provide a first order correction of amplifier distortion. A second amplifier is utilized to sense the base-to-emitter distortion of a main amplifier and develop an error output which is injected into an output node to provide |
| 7433377 |
Laser drive method and apparatus |
October 7, 2008 |
| A laser diode is employed to output light. A laser driver is employed to drive the laser diode. A laser driver control unit is employed to control the driving, such that carrier concentration of the laser is substantially forced to a desired concentration as photon level of the laser |
| 6230140 |
Continuous sound by concatenating selected digital sound segments |
May 8, 2001 |
| Non-looped continuous sound made up of random sequencing of digital sound segments is generated by taking several short segments of an otherwise continuous sound and forming independent records of those short segments. The stored segments are re-assembled into a sound sequence of arbitra |
| 5940005 |
Method and apparatus for storing and utilizing a unique power down state in a model railroad sys |
August 17, 1999 |
| An electronic control system for model railroads incorporates a motor control unit, an electronic state generator that generates particular operating state signals responsive to multiple reset conditions. A first reset condition initiates sequencing of motor control states and a second |
| 5896017 |
Model train locomotive with doppler shifting of sound effects |
April 20, 1999 |
| Electronic circuits and methods are disclosed for remote control of a locomotive in a model railroad layout having an interruptible DC power supply coupled to the railroad track. The locomotive motor is isolated from the track so as to allow use of polarity reversals on the track power |
| 5832431 |
Non-looped continuous sound by random sequencing of digital sound records |
November 3, 1998 |
| Several short segments of an otherwise continuous sound are recorded and stored in a digital memory. The stored segments are concatenated together to form a sound sequence of arbitrary length, based on selecting the next sound segment according to some statistical algorithm. The selected |
| 5773939 |
Command control for model railroading using AC track power signals for encoding pseudo-digital s |
June 30, 1998 |
| Apparatus and methods are disclosed for transmitting very fast digital DC signals over the track for remote control in a model railroad layout, by selecting positive and negative lobes from the applied AC track power signal. This method allows digital transmission at 120 Hz rate that can |
| 5633985 |
Method of generating continuous non-looped sound effects |
May 27, 1997 |
| Non-looped continuous sound made up of random sequencing of digital sound segments is generated by taking several short segments of an otherwise continuous sound and forming independent records of those short segments. The stored segments are re-assembled into a sound sequence of arbitra |
| 5590856 |
Complex switch turn-out arrangements using proximity selection |
January 7, 1997 |
| A method and apparatus for directing the movement of a train around a model railroad track having one or more turn-outs activated by at least two separate arming signals. Each signal is linked to a specified direction of the turn-outs such as straight, curve right, or curve left. The arm |
| 5492290 |
Model railroad operation using proximity selection |
February 20, 1996 |
| An electronic control system for model railroads incorporates electronics which "arms" all railroad track switch turn-outs (here after referred to as "turn-outs") at once, selects and toggles the state of a specific turnout by the approach of a model train directly after arming, and |
| 5448142 |
Signaling techniques for DC track powered model railroads |
September 5, 1995 |
| Electronic circuits and methods are provided for remote control of a locomotive in a model railroad layout having an interruptible DC power supply coupled to the railroad track. The locomotive motor is isolated from the track so as to allow use of polarity reversals on the track power |
| 5394068 |
Automatic initialization in a model railroad motor control system |
February 28, 1995 |
| Electronic control circuits for model railroading including a reversing motor control circuit. An on-board electronic state machine indicates one at a time of a predetermined series of states including forward, neutral and reverse, and is clocked to the next state responsive to an interr |
| 5267318 |
Model railroad cattle car sound effects |
November 30, 1993 |
| A model railroad cattle car sound effects system includes a speech synthesis circuit (FIG. 6) for "playing" selected cow voices stored as digital data in an EPROM (160). In a random mode of operation, a state generator (30) provides a pseudo-random count that is used to select among |
| 5247468 |
System for calculating and displaying user-defined output parameters describing behavior of subc |
September 21, 1993 |
| An improved circuit simulator interface permits a user to define one or more output parameters describing behavior of hierarchically-defined subcircuits of a circuit. The user defines each output parameter by a hierarchial expression including one or more primitive output parameters |
| 5184048 |
Model railroad reversing motor control system |
February 2, 1993 |
| An electronic control system for model railroads incorporates a motor control unit, an electronic state generator that generates particular operating state signals and a remote control signal generator that multiplies the number of remote control effects that would be available from |
| 4914431 |
Electronic control system for model railroads |
April 3, 1990 |
| An electronic control system for model railroads incoporates a motor control unit, an electronic state generator that generates particular operating state signals and a remote control signal generator that multiplies the number of remote control effects that would be available from t |
| 4767945 |
Analog signal multiplexer |
August 30, 1988 |
| An analog signal multiplexer for differential signals comprises a plurality of channels, each channel having a pair of differential amplifiers forming an input stage for receiving a differential input signal and a pair of output transistors for forming an output stage producing a differe |
| 4731588 |
Gain selectable amplifier with resonance compensation |
March 15, 1988 |
| A resonance compensated unity voltage gain amplifier comprises an input stage and an output stage connected in feedback to the input stage and a series resonance circuit for compensating for the resonance of the output and input stages created by the feedback. Reactance of the series |
| 4725790 |
Broadband DC level shift circuit with feedback |
February 16, 1988 |
| A DC level shift circuit includes a differential amplifier with a level shift stage. The level shift stage has two portions for transmitting the input signals forming the differential signal through the level shift stage. A current source transmits the input signals through the level |
| 4692712 |
Differential impedance neutralization circuit |
September 8, 1987 |
| An impedance neutralization circuit produces correction currents to compensate for the effects of parasitic impedance on the output voltage of an amplifier. In the described embodiment, the neutralization circuit includes a pair of emitter followers, one coupled to the collector of each |
| 4146844 |
Feed-forward amplifier |
March 27, 1979 |
| A high-precision amplifier employs a feed-forward technique to provide a first order correction of amplifier distortion. A second amplifier is utilized to sense the base-to-emitter distortion of a main amplifier and develop an error output which is injected into an output node to provide |
