A method for testing various types of devices or systems employs a modular test instrument comprising a base unit and one of a selection of application modules, neither being capable of performing end-user functions without the other. When physically assembled to one another, the base unit and appli
A method for testing various types of devices or systems employs a modular test instrument comprising a base unit and one of a selection of application modules, neither being capable of performing end-user functions without the other. When physically assembled to one another, the base unit and application module comprise a structurally unitary device specialized for performance of application-specific end-user functions. The base unit is generic to all types of test to be provided, and comprises a display, a power supply, a user interface, and generic software to operate the display and user interface. Each application module is connected to the base unit in the same manner, so that the same base unit can be employed with a wide variety of application modules. The application modules can be readily and conveniently removed from and assembled to the base unit. The application-specific application modules each include a physical interface for establishing signal-communicating connection to the device or system to be tested, and application-specific program data and software, including information required to provide appropriate test signals, test messages, and the like. Each application module also stores user interface software for providing an application-specific user interface. When an application module is assembled to a base unit, polling software comprised by the base unit determines the identity of the application module, and determines whether it stores any software or other program data not previously copied to the base unit's memory; if not, the copying step is begun automatically upon assembly.
대표청구항▼
A method for testing various types of devices or systems employs a modular test instrument comprising a base unit and one of a selection of application modules, neither being capable of performing end-user functions without the other. When physically assembled to one another, the base unit and appli
A method for testing various types of devices or systems employs a modular test instrument comprising a base unit and one of a selection of application modules, neither being capable of performing end-user functions without the other. When physically assembled to one another, the base unit and application module comprise a structurally unitary device specialized for performance of application-specific end-user functions. The base unit is generic to all types of test to be provided, and comprises a display, a power supply, a user interface, and generic software to operate the display and user interface. Each application module is connected to the base unit in the same manner, so that the same base unit can be employed with a wide variety of application modules. The application modules can be readily and conveniently removed from and assembled to the base unit. The application-specific application modules each include a physical interface for establishing signal-communicating connection to the device or system to be tested, and application-specific program data and software, including information required to provide appropriate test signals, test messages, and the like. Each application module also stores user interface software for providing an application-specific user interface. When an application module is assembled to a base unit, polling software comprised by the base unit determines the identity of the application module, and determines whether it stores any software or other program data not previously copied to the base unit's memory; if not, the copying step is begun automatically upon assembly. g an inverse motion coefficient quantizer corresponding to the selected motion coefficient quantizer, means for determining the motion of the picture element with respect to the piece of reference video information using the inverse quantized motion coefficients and the basis functions, means for determining the prediction video information for the picture element using the piece of reference video information and the determined motion of the picture element, and said prediction error coder comprises: means for determining a piece of prediction error video information based on a difference between the prediction video information for the picture element and the piece of current video information,means for transforming the piece of prediction error video information, thereby representing it with prediction error coefficients, andmeans for quantizing the prediction error coefficients using a prediction error quantizer.27. An encoder according to claim 26, wherein said means for selecting a motion coefficient quantizer is arranged to select a motion coefficient quantizer based on the prediction error quantizer.28. An encoder according to claim 26, in which the prediction error quantizer has a certain quantization interval, wherein said means for selecting a motion coefficient quantizer is arranged to select a motion coefficient quantizer in dependence on the quantization interval of the prediction error quantizer.29. An encoder according to claim 25, wherein the predetermined selection criterion is indicative of a target image quality.30. An encoder according to claim 25, wherein the predetermined selection criterion is indicative of a target bit rate for transmission of the encoded video information.31. A decoder for the decoding encoded video information, comprising: a memory for storing a piece of reference video information, an input for receiving quantized motion coefficients, and a motion compensated predictor comprising: selection means for selecting an inverse motion coefficient quantizer from a set of inverse motion coefficient quantizers, said selection means having an input for receiving information indicating a selection criterion and an output for outputting information indicating a selected inverse motion coefficient quantizer,inverse quantization means for inversely quantizing quantized motion coefficients using a selected inverse motion coeff
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