Abstract: A LiDAR sensor includes a light emitter designed to emit light into a field of illumination. The wavelength of the light emitted by the light emitter is dependent on the temperature of the light emitter. A light detector has a field of view overlapping the field of illumination. A bandpass filter is between the light detector and the field of illumination of the light emitter. The bandpass filter is designed to pass light to the light detector in a wavelength range that is dependent on the temperature of the bandpass filter. The LiDAR sensor includes at least one temperature controller. The light emitter is coupled to a temperature controller and the bandpass filter is coupled to a temperature controller. A method of operating the LiDAR sensor includes controlling the temperatures of the bandpass filter and the light emitter.

Abstract: A Lidar system includes a photodetector having a field of view. The system includes a light emitter and an exit window positioned to transmit light from the light emitter into a field of illumination overlapping the field of view. The system includes a light-intensity pattern element between the light emitter and the exit window and designed to apply a pattern in the intensity of light across the field of illumination.

Abstract: A telephone training device to be operated by children or someone without a working knowledge of telephones, uses at least one working telephone, and a memory to store a first set of numbers, a receiver to accept a second set of numbers, a comparator to compare the second set of numbers to the first set of numbers, and a tone generator. The tone generator generates one tone when the handset is removed from the telephone, a second tone when the second set of numbers is different from the first set of numbers, and a third tone when the second set of numbers is the same as the first set of numbers.

Abstract: An apparatus for verifying the central office billing translations from a remote location is disclosed. The system includes a processor with software which generates patterned telephone calls through a test set at the switch at a switching station to all working access codes. The billing information of these calls is then recorded. Once the recorded information is processed, the records which originated from the test set are identified by their assigned telephone number. These records are extracted and preferably recorded such that they can be automatically verified against an accurate routing and billing table for the specific site. The table is preferably stored in the test set.

Abstract: The present invention provides a test set which checks the communication line from a central office to a telephone responder which has a predetermined telephone number and which generates an output signal consisting of a predetermined sequence of signals. The checking is performed from a central testing station from where an operator inputs a test signal which identifies the telephone number of the test set located in the central office from which the test is to be made. Once the connection is established, the telephone number of the responder to be called is transmitted. The test set includes a signal detector which identifies an input signal. The signal detector is interfaced to the responder transmission medium such that the signal detector receives responder output signal as an input signal. The test set further includes a memory which includes the correct signal which should be received from the responder with called telephone number, and a processor.

Abstract: A mass polling system is situated in a central office of a telephone system, and does not employ toll machines or trunk lines leading to toll machines. The mass polling system ensures that a charge record is generated before the beginning of a recorded announcement, during the period while the caller is receiving an audible ring signal. Preferably, the charge record is generated at the initiation of the audible ring signal. In this way billing errors due to early caller disconnect are reduced or eliminated. The mass polling system is responsive to a billing disable command which prevents the mass polling system from causing charge records to be generated when the mass polling system is out of service.