Abstract: A vehicle seat includes a subframe arranged to be secured to the vehicle or and an upper frame mounted on the subframe by four pivotal levers to form two pairs of parallelogram linkages and so constrain movement of the upper frame relative to the lower frame along an arcuate path.A pair of mounting plates carrying a back rest are pivotally secured to opposite sides of the upper frame. A pair of control levers couple the mounting plates to respective levers in a manner such that when the mounting plates are pivoted by tilting the back rest forward into a horizontal attitude, the upper frame is caused to move along its arcuate path and so draw the back rest forward to allow greater access to the area behind the back rest.

Abstract: A time domain speech recognition system is disclosed wherein a speech signal is infinitely clipped in order to derive its zero crossover pattern. A pitch pulse detector generates standardized marker pulses in synchronism with the glottal pressure pulses occurring during voiced sounds. Using these marker pulses as trigger signals, a sampling gate samples the infinitely clipped speech signal in synchronism with the glottal pulses. In the absence of a voiced signal, sampling is performed at a pseudo random rate. The zero crossing samples obtained are normalized with respect to voice pitch and are classified as belonging to a particular set of speech sounds called phonemes in accordance with a number of parameters including number and length of the zero crossover intervals, the length of the pitch pulse interval and the relative number of changes in the duration of the crossover intervals in a pitch pulse interval.