Abstract: In embodiments of color rendering on a hue plane, a color rendering module can receive three channels of color information. The color rendering module converts the three channels of color information to two channels of color information and performs a color rendering operation on the two channels of color information to provide two channels of rendered color information. The color rendering module then converts the two channels of rendered color information back to three channels of rendered color information.

Abstract: In embodiments of color rendering on a hue plane, a color rendering module can receive three channels of color information. The color rendering module converts the three channels of color information to two channels of color information and performs a color rendering operation on the two channels of color information to provide two channels of rendered color information. The color rendering module then converts the two channels of rendered color information back to three channels of rendered color information.

Abstract: A communications system includes a receiver and a transmitter for transmitting a communications signal to the receiver. The transmitter adjusts its transmission power level in response to receiver power control signals transmitted by the receiver. The receiver includes an attenuator for attenuating the received communications signal, and measurement circuitry for measuring the signal strength of the attenuated signal. The measured signal strength is coupled to an attenuator controller and to a transmission power controller. The attenuator controller and the transmission controller adjust, respectively, receiver attenuation and transmitter power level so as to optimize system performance. This may include keeping the attenuated signal within the dynamic range of the receiver.

Abstract: A safety and test device for railway signalling systems comprising a calculating device or computer adapted to treat information signals, relating to prevailing speed and desired speed, and to activate a brake device if said treatment reveals that speed reduction is necessary. In order to control itself the computer is programmed to run through special test programs, suitably sections of the ordinary program with given start data, and at the end of each such test program generate a control word, specific for each test program and coming in a given sequence. A control unit connected between the computer and the brake device receives the control words generated by the computer and compares them with correct words stored in a memory and generates an output pulse, each time an incoming control word coincides with a correct control word stored in the memory.