Abstract: A precision oven-controlled crystal oscillator (OCXO) uses an adjustment feedback signal that, when mixed with a reference signal from a stable reference oscillator, accurately controls the generation of an output signal from a voltage controlled crystal oscillator (VCXO). An OCXO according to the invention has high stability and high accuracy. The digital OXCO can be manufactured at low cost, and is particularly beneficial for Code Division Multiple Access (CDMA) base station applications in cellular communication networks an the like.

Abstract: A precision oven-controlled crystal oscillator (OCXO) uses an adjustment feedback signal that, when mixed with a reference signal from a stable reference oscillator, accurately controls the generation of an output signal from a voltage controlled crystal oscillator (VCXO). An OCXO according to the invention has high stability and high accuracy. The digital OXCO can be manufactured at low cost, and is particularly beneficial for Code Division Multiple Access (CDMA) base station applications in cellular communication networks an the like.

Abstract: A precision oven-controlled crystal oscillator (OCXO) uses an adjustment feedback signal that, when mixed with a reference signal from a stable reference oscillator, accurately controls the generation of an output signal from a voltage controlled crystal oscillator (VCXO). An OCXO according to the invention has high stability and high accuracy. The digital OXCO can be manufactured at low cost, and is particularly beneficial for Code Division Multiple Access (CDMA) base station applications in cellular communication networks an the like.

Abstract: A precision oven-controlled crystal oscillator (OCXO) uses an adjustment feedback signal that, when mixed with a reference signal from a stable reference oscillator, accurately controls the generation of an output signal from a voltage controlled crystal oscillator (VCXO). An OCXO according to the invention has high stability and high accuracy. The digital OXCO can be manufactured at low cost, and is particularly beneficial for Code Division Multiple Access (CDMA) base station applications in cellular communication networks an the like.

Abstract: A system for simulating the operation of a vehicle, comprising a monitor for displaying a sequence of visual images; a plurality of control devices for the simulated vehicle for manipulation by an operator of the simulated vehicle; a computer, responsive to manipulation of the simulated vehicle control devices, for presenting a temporal sequence of visual images to the operator on the monitor which depicts the operation of the simulated vehicle along a roadway in a simulated environment; a mechanism for dynamically controlling weather effects in the simulated environment; and a mechanism for creating a traffic event in the simulated environment on demand during a simulation session and presenting the traffic event to the operator substantially immediately thereafter.

Abstract: A system for simulating the operation of a vehicle, comprising a monitor for displaying a sequence of visual images; a plurality of control devices for the simulated vehicle for manipulation by an operator of the simulated vehicle; a computer, responsive to manipulation of the simulated vehicle control devices, for presenting a temporal sequence of visual images to the operator on the monitor which depicts the operation of the simulated vehicle along a roadway in a simulated environment; a mechanism for dynamically controlling weather effects in the simulated environment; and a mechanism for creating a traffic event in the simulated environment on demand during a simulation session and presenting the traffic event to the operator substantially immediately thereafter.