Abstract: The invention is a conversion kit for converting a two-wheeled motorcycle into a three-wheeled motorcycle providing for increasing both the lateral and longitudinal stability of a conventional motorcycle while maintaining the conventional positioning of the motorcycle rider. The invention replacing the front wheel with a pair of opposed wheels connected to the conventional front fork by an elongated kit frame. The kit frame is narrow and does not provide for enclosing the driver within the frame. The elongated frame provides for greater longitudinal stability and the opposed front wheels provide for greater lateral stability. The kit frame is directly mounted to the conventional motorcycle front fork, requiring limited modification to the conventional motorcycle and eliminating special connectors required by prior designs.

Abstract: A media flaw detection apparatus having a sensitivity which is independent of the location of the flaw relative to the written test signal. The apparatus is equally sensitive to missing or extra bit defects. According to the invention, in-phase and quadrature-phase signals are heterodyned against the analog playback input signal. The resulting signals are squared and summed to produce a signal analogous to the effect of the flaw.

Abstract: A read channel detector circuit for recovery of digital data from a readback waveform produced by a magnetic recording head is disclosed. The detector circuit includes a forward filter for slimming the rising edge and slurring the falling edge of an isolated input magnetic pulse. Quantized feedback techniques are then used to produce a compensating waveform which is substantially complimentary to the portion of the filtered waveform occurring after T.sub.min. The complimentary waveform is then added to the forward filter output to produce a waveform which is substantially a step function. This step function corresponds to a single digital transition, either positive-going or negative-going in a digital output sequence. The equalized waveform is then limited by a comparator to produce the desired digital output sequence.

Abstract: A read channel detector circuit for recovery of digital data from a readback waveform produced by a magnetic recording head is disclosed. The detector circuit includes a forward filter for slimming the rising edge and slurring the falling edge of an isolated input magnetic pulse. Quantized feedback techniques are then used to produce a compensating waveform which is substantially complimentary to the slurred falling edge of the isolated magnetic pulse. The complimentary waveform is added to the forward filter output to produce a waveform which is substantially a step function. This step function corresponds to a single digital transition, either positive-going or negative-going in a digital output sequence. The equalized waveform is then limited by a comparator to produce the desired digital output sequence.

Abstract: Direct current null in the reproduction of a high density, digital, magnetic recording is equalized by the apparatus which first slims the magnetic head output pulse until one-half the main lobe time width of the pulse is equal to one-half the minimum time between polarity transitions, then, integrates the slimmed pulse, centers it about a zero reference voltage level, and finally, through a limiter, produces an output pulse signal which has abrupt output transitions whenever the centered, integrated pulse crosses the zero reference voltage level.

Abstract: A pulse improvement circuit for a magnetic readback system produces a data representative signal having symmetrical, equal-amplitude pulses of limited time widths. The circuit includes an equalizer made in accordance to a final transfer function produced as a result of a mathematical convolution of first and second transfer functions. The first transfer function is based on the theory of a matched filter for receiving a signal having data representative and non-white noise pulses contained therein to produce a filter signal having maximum signal to noise ratio. The second transfer function is based on the theory of a Papoulis window function for slimming the pulses contained in the filter signal. A specific circuit implementation of the final transfer function is an eight-pole, inductor-capacitor, ladder network for amplitude equalization coupled to an inductor-capacitor, lattice network including first and second order sections for phase equalization.