A wind turbine hybrid braking system is presented. Further, the apparatus for 3D mesh compression based on quantization includes a decision bit encoding unit for calculating a decision bit by using the quantized connectivity information and then encoding the quantized vertex information, property information and connectivity information by using the decision bit. A low computational complexity version of the equaliser and a regularized equalizer with further reduced complexity for asynchronous reception are also disclosed. The correcting module is used to store the variant correction code and calculate the variant correction code and the linear block code to generate a substitute code to substitute the linear block code. The vibratory structure gyroscope can also include a resonator having a hemitoroidal shape, the resonator including a stem and an outer lip that surrounds the stem, the stem attached to the top surface of the substrate and the outer lip located apart from the top surface to allow the resonator to vibrate.