Abstract: In a signal measurement or processing system, specifically in a system which contemplates measurement or processing of video information and which is particularly adapted for use with microprocessors or microcomputers characterized by modest memory capacity and computational capability, a digital hysteresis circuit that enhances the quantization of an analog video signal. The hysteresis circuit is part of a transition detector that quantizes the brightness component of a composite video signal level into mutually exclusive and exhaustive BLACK and WHITE levels determined with regard to a THRESHOLD level. The THRESHOLD is established by applying a REFERENCE voltage, derived from the peak amplitude of the video signal, to a reference input of a D/A. The THRESHOLD is then established as a predetermined percentage of the REFERENCE voltage, as determined by a multibit digital CONTROL signal applied to the CONTROL input of the D/A.

Abstract: A bifurcated electroacoustic delay line includes first and second branches of a transmission medium, the branches being joined along respective common sides. Bonded to the common sides of the branches are respective first and second input and first and second output transducers, the transducers arranged so that the input transducers are positioned laterally adjacent each other and the output transducers are analogously positioned. An inductance diagonally couples the first output transducer to the second input transducer permits frequency tuning of the delay line.Diagonal coupling via an inductance operates to mitigate the effects of spurious responses derived from the divergence of electroacoustic waves between laterally adjacent tranducers and, collaterally, permits tuning of the delay line composite frequency response.